diff --git a/src/tools/windows/converter_exe/binary/configure.cmd b/src/tools/windows/converter_exe/binary/configure.cmd
new file mode 100644
index 0000000..39b1d2a
--- /dev/null
+++ b/src/tools/windows/converter_exe/binary/configure.cmd
@@ -0,0 +1,33 @@
+@if "%ECHOON%"=="" @echo off
+SETLOCAL
+
+REM ******************************************************************
+REM Please, make sure to run this in an Elevated Command Prompt.
+REM Usage:
+REM        configure.cmd
+REM ******************************************************************
+
+REM ******************************************************************
+REM Initialize
+REM ******************************************************************
+SET SCRIPT_LOCATION=%~dp0
+
+REM ******************************************************************
+REM Go to script location
+REM ******************************************************************
+pushd %SCRIPT_LOCATION%
+
+REM ******************************************************************
+REM Register msdia120.dll.
+REM ******************************************************************
+SET MSG=Failed to register msdia120.dll.  Make sure to run this in elevated command prompt.
+%systemroot%\SysWoW64\regsvr32.exe /s msdia120.dll & if errorlevel 1 echo %MSG% & goto :fail
+
+:success
+echo Configuration was successful.
+ENDLOCAL
+exit /b 0
+
+:fail
+ENDLOCAL
+exit /b 1
diff --git a/src/tools/windows/converter_exe/binary/missing_symbols_test.txt b/src/tools/windows/converter_exe/binary/missing_symbols_test.txt
new file mode 100644
index 0000000..251b4ec
--- /dev/null
+++ b/src/tools/windows/converter_exe/binary/missing_symbols_test.txt
@@ -0,0 +1,2 @@
+msctf.pdb|6A5BABB8E88644C696530BFE3C90F32F2|6.1.7600.16385|msctf.dll|4A5BDFAA109000
+imm32.pdb|98F27BA5AEE541ECBEE00CD03AD50FEE2|6.1.7600.16385|imm32.dll|4A5BDF402e000
diff --git a/src/tools/windows/converter_exe/binary/sleep.exe b/src/tools/windows/converter_exe/binary/sleep.exe
new file mode 100644
index 0000000..d178e17
--- /dev/null
+++ b/src/tools/windows/converter_exe/binary/sleep.exe
Binary files differ
diff --git a/src/tools/windows/converter_exe/binary/symsrv.yes b/src/tools/windows/converter_exe/binary/symsrv.yes
new file mode 100644
index 0000000..1d01dda
--- /dev/null
+++ b/src/tools/windows/converter_exe/binary/symsrv.yes
@@ -0,0 +1,2 @@
+See breakpad/tools/windows/converter/ms_symbol_server_converter.h for a
+description of this file's function.
diff --git a/src/tools/windows/converter_exe/configure.cmd b/src/tools/windows/converter_exe/configure.cmd
new file mode 100644
index 0000000..39b1d2a
--- /dev/null
+++ b/src/tools/windows/converter_exe/configure.cmd
@@ -0,0 +1,33 @@
+@if "%ECHOON%"=="" @echo off
+SETLOCAL
+
+REM ******************************************************************
+REM Please, make sure to run this in an Elevated Command Prompt.
+REM Usage:
+REM        configure.cmd
+REM ******************************************************************
+
+REM ******************************************************************
+REM Initialize
+REM ******************************************************************
+SET SCRIPT_LOCATION=%~dp0
+
+REM ******************************************************************
+REM Go to script location
+REM ******************************************************************
+pushd %SCRIPT_LOCATION%
+
+REM ******************************************************************
+REM Register msdia120.dll.
+REM ******************************************************************
+SET MSG=Failed to register msdia120.dll.  Make sure to run this in elevated command prompt.
+%systemroot%\SysWoW64\regsvr32.exe /s msdia120.dll & if errorlevel 1 echo %MSG% & goto :fail
+
+:success
+echo Configuration was successful.
+ENDLOCAL
+exit /b 0
+
+:fail
+ENDLOCAL
+exit /b 1
diff --git a/src/tools/windows/converter_exe/converter.cc b/src/tools/windows/converter_exe/converter.cc
new file mode 100644
index 0000000..23216f9
--- /dev/null
+++ b/src/tools/windows/converter_exe/converter.cc
@@ -0,0 +1,807 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#pragma comment(lib, "winhttp.lib")
+#pragma comment(lib, "wininet.lib")
+#pragma comment(lib, "diaguids.lib")
+#pragma comment(lib, "imagehlp.lib")
+
+#include <cassert>
+#include <cstdio>
+#include <ctime>
+#include <map>
+#include <regex>
+#include <string>
+#include <vector>
+
+#include "tools/windows/converter_exe/escaping.h"
+#include "tools/windows/converter_exe/http_download.h"
+#include "tools/windows/converter_exe/tokenizer.h"
+#include "common/windows/http_upload.h"
+#include "common/windows/string_utils-inl.h"
+#include "tools/windows/converter/ms_symbol_server_converter.h"
+
+using strings::WebSafeBase64Unescape;
+using strings::WebSafeBase64Escape;
+
+namespace {
+
+using std::map;
+using std::string;
+using std::vector;
+using std::wstring;
+using crash::HTTPDownload;
+using crash::Tokenizer;
+using google_breakpad::HTTPUpload;
+using google_breakpad::MissingSymbolInfo;
+using google_breakpad::MSSymbolServerConverter;
+using google_breakpad::WindowsStringUtils;
+
+const char *kMissingStringDelimiters = "|";
+const char *kLocalCachePath = "c:\\symbols";
+const char *kNoExeMSSSServer = "http://msdl.microsoft.com/download/symbols/";
+
+const int kMatchArrSize = 64;
+
+// Windows stdio doesn't do line buffering.  Use this function to flush after
+// writing to stdout and stderr so that a log will be available if the
+// converter crashes.
+static int FprintfFlush(FILE *file, const char *format, ...) {
+  va_list arguments;
+  va_start(arguments, format);
+  int retval = vfprintf(file, format, arguments);
+  va_end(arguments);
+  fflush(file);
+  return retval;
+}
+
+static string CurrentDateAndTime() {
+  const string kUnknownDateAndTime = "????-??-?? ??:??:??";
+
+  time_t current_time;
+  time(&current_time);
+
+  // localtime_s is safer but is only available in MSVC8.  Use localtime
+  // in earlier environments.
+  struct tm *time_pointer;
+#if _MSC_VER >= 1400  // MSVC 2005/8
+  struct tm time_struct;
+  time_pointer = &time_struct;
+  if (localtime_s(time_pointer, &current_time) != 0) {
+    return kUnknownDateAndTime;
+  }
+#else  // _MSC_VER >= 1400
+  time_pointer = localtime(&current_time);
+  if (!time_pointer) {
+    return kUnknownDateAndTime;
+  }
+#endif  // _MSC_VER >= 1400
+
+  char buffer[256];
+  if (!strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", time_pointer)) {
+    return kUnknownDateAndTime;
+  }
+
+  return string(buffer);
+}
+
+// ParseMissingString turns |missing_string| into a MissingSymbolInfo
+// structure.  It returns true on success, and false if no such conversion
+// is possible.
+static bool ParseMissingString(const string &missing_string,
+                               MissingSymbolInfo *missing_info) {
+  assert(missing_info);
+
+  vector<string> tokens;
+  Tokenizer::Tokenize(kMissingStringDelimiters, missing_string, &tokens);
+  if (tokens.size() != 5) {
+    return false;
+  }
+
+  missing_info->debug_file = tokens[0];
+  missing_info->debug_identifier = tokens[1];
+  missing_info->version = tokens[2];
+  missing_info->code_file = tokens[3];
+  missing_info->code_identifier = tokens[4];
+
+  return true;
+}
+
+// StringMapToWStringMap takes each element in a map that associates
+// (narrow) strings to strings and converts the keys and values to wstrings.
+// Returns true on success and false on failure, printing an error message.
+static bool StringMapToWStringMap(const map<string, string> &smap,
+                                  map<wstring, wstring> *wsmap) {
+  assert(wsmap);
+  wsmap->clear();
+
+  for (map<string, string>::const_iterator iterator = smap.begin();
+       iterator != smap.end();
+       ++iterator) {
+    wstring key;
+    if (!WindowsStringUtils::safe_mbstowcs(iterator->first, &key)) {
+      FprintfFlush(stderr,
+                   "StringMapToWStringMap: safe_mbstowcs failed for key %s\n",
+                   iterator->first.c_str());
+      return false;
+    }
+
+    wstring value;
+    if (!WindowsStringUtils::safe_mbstowcs(iterator->second, &value)) {
+      FprintfFlush(stderr, "StringMapToWStringMap: safe_mbstowcs failed "
+                           "for value %s\n",
+                   iterator->second.c_str());
+      return false;
+    }
+
+    wsmap->insert(make_pair(key, value));
+  }
+
+  return true;
+}
+
+// MissingSymbolInfoToParameters turns a MissingSymbolInfo structure into a
+// map of parameters suitable for passing to HTTPDownload or HTTPUpload.
+// Returns true on success and false on failure, printing an error message.
+static bool MissingSymbolInfoToParameters(const MissingSymbolInfo &missing_info,
+                                          map<wstring, wstring> *wparameters) {
+  assert(wparameters);
+
+  map<string, string> parameters;
+  string encoded_param;
+  // Indicate the params are encoded.
+  parameters["encoded"] = "true";  // The string value here does not matter.
+
+  WebSafeBase64Escape(missing_info.code_file, &encoded_param);
+  parameters["code_file"] = encoded_param;
+
+  WebSafeBase64Escape(missing_info.code_identifier, &encoded_param);
+  parameters["code_identifier"] = encoded_param;
+
+  WebSafeBase64Escape(missing_info.debug_file, &encoded_param);
+  parameters["debug_file"] = encoded_param;
+
+  WebSafeBase64Escape(missing_info.debug_identifier, &encoded_param);
+  parameters["debug_identifier"] = encoded_param;
+
+  if (!missing_info.version.empty()) {
+    // The version is optional.
+    WebSafeBase64Escape(missing_info.version, &encoded_param);
+    parameters["version"] = encoded_param;
+  }
+
+  WebSafeBase64Escape("WinSymConv", &encoded_param);
+  parameters["product"] = encoded_param;
+
+  if (!StringMapToWStringMap(parameters, wparameters)) {
+    // StringMapToWStringMap will have printed an error.
+    return false;
+  }
+
+  return true;
+}
+
+// UploadSymbolFile sends |converted_file| as identified by |missing_info|
+// to the symbol server rooted at |upload_symbol_url|.  Returns true on
+// success and false on failure, printing an error message.
+static bool UploadSymbolFile(const wstring &upload_symbol_url,
+                             const MissingSymbolInfo &missing_info,
+                             const string &converted_file) {
+  map<wstring, wstring> parameters;
+  if (!MissingSymbolInfoToParameters(missing_info, &parameters)) {
+    // MissingSymbolInfoToParameters or a callee will have printed an error.
+    return false;
+  }
+
+  wstring converted_file_w;
+
+  if (!WindowsStringUtils::safe_mbstowcs(converted_file, &converted_file_w)) {
+    FprintfFlush(stderr, "UploadSymbolFile: safe_mbstowcs failed for %s\n",
+                 converted_file.c_str());
+    return false;
+  }
+  map<wstring, wstring> files;
+  files[L"symbol_file"] = converted_file_w;
+
+  FprintfFlush(stderr, "Uploading %s\n", converted_file.c_str());
+  if (!HTTPUpload::SendRequest(
+      upload_symbol_url, parameters,
+      files, NULL, NULL, NULL)) {
+    FprintfFlush(stderr, "UploadSymbolFile: HTTPUpload::SendRequest failed "
+                         "for %s %s %s\n",
+                 missing_info.debug_file.c_str(),
+                 missing_info.debug_identifier.c_str(),
+                 missing_info.version.c_str());
+    return false;
+  }
+
+  return true;
+}
+
+// SendFetchFailedPing informs the symbol server based at
+// |fetch_symbol_failure_url| that the symbol file identified by
+// |missing_info| could authoritatively not be located.  Returns
+// true on success and false on failure.
+static bool SendFetchFailedPing(const wstring &fetch_symbol_failure_url,
+                                const MissingSymbolInfo &missing_info) {
+  map<wstring, wstring> parameters;
+  if (!MissingSymbolInfoToParameters(missing_info, &parameters)) {
+    // MissingSymbolInfoToParameters or a callee will have printed an error.
+    return false;
+  }
+
+  string content;
+  if (!HTTPDownload::Download(fetch_symbol_failure_url,
+                              &parameters,
+                              &content,
+                              NULL)) {
+    FprintfFlush(stderr, "SendFetchFailedPing: HTTPDownload::Download failed "
+                         "for %s %s %s\n",
+                 missing_info.debug_file.c_str(),
+                 missing_info.debug_identifier.c_str(),
+                 missing_info.version.c_str());
+    return false;
+  }
+
+  return true;
+}
+
+// Returns true if it's safe to make an external request for the symbol
+// file described in missing_info. It's considered safe to make an
+// external request unless the symbol file's debug_file string matches
+// the given blacklist regular expression.
+// The debug_file name is used from the MissingSymbolInfo struct,
+// matched against the PCRE blacklist_regex.
+static bool SafeToMakeExternalRequest(const MissingSymbolInfo &missing_info,
+                                      std::regex blacklist_regex) {
+  string file_name = missing_info.debug_file;
+  if (std::regex_match(file_name, blacklist_regex)) {
+    FprintfFlush(stderr, "Not safe to make external request for file %s\n",
+                 file_name.c_str());
+    return false;
+  }
+
+  return true;
+}
+
+// Converter options derived from command line parameters.
+struct ConverterOptions {
+  ConverterOptions()
+      : report_fetch_failures(true),
+        blacklist_regex(nullptr) {
+  }
+
+  ~ConverterOptions() {
+  }
+
+  // Names of MS Symbol Supplier Servers that are internal to Google, and may
+  // have symbols for any request.
+  vector<string> full_internal_msss_servers;
+
+  // Names of MS Symbol Supplier Servers that are internal to Google, and
+  // shouldn't be checked for symbols for any .exe files.
+  vector<string> full_external_msss_servers;
+
+  // Names of MS Symbol Supplier Servers that are external to Google, and may
+  // have symbols for any request.
+  vector<string> no_exe_internal_msss_servers;
+
+  // Names of MS Symbol Supplier Servers that are external to Google, and
+  // shouldn't be checked for symbols for any .exe files.
+  vector<string> no_exe_external_msss_servers;
+
+  // Temporary local storage for symbols.
+  string local_cache_path;
+
+  // URL for uploading symbols.
+  wstring upload_symbols_url;
+
+  // URL to fetch list of missing symbols.
+  wstring missing_symbols_url;
+
+  // URL to report symbol fetch failure.
+  wstring fetch_symbol_failure_url;
+
+  // Are symbol fetch failures reported.
+  bool report_fetch_failures;
+
+  // File containing the list of missing symbols.  Fetch failures are not
+  // reported if such file is provided.
+  string missing_symbols_file;
+
+  // Regex used to blacklist files to prevent external symbol requests.
+  // Owned and cleaned up by this struct.
+  std::regex blacklist_regex;
+
+ private:
+  // DISABLE_COPY_AND_ASSIGN
+  ConverterOptions(const ConverterOptions&);
+  ConverterOptions& operator=(const ConverterOptions&);
+};
+
+// ConverMissingSymbolFile takes a single MissingSymbolInfo structure and
+// attempts to locate it from the symbol servers provided in the
+// |options.*_msss_servers| arguments.  "Full" servers are those that will be
+// queried for all symbol files; "No-EXE" servers will only be queried for
+// modules whose missing symbol data indicates are not main program executables.
+// Results will be sent to the |options.upload_symbols_url| on success or
+// |options.fetch_symbol_failure_url| on failure, and the local cache will be
+// stored at |options.local_cache_path|.  Because nothing can be done even in
+// the event of a failure, this function returns no value, although it
+// may result in error messages being printed.
+static void ConvertMissingSymbolFile(const MissingSymbolInfo &missing_info,
+                                     const ConverterOptions &options) {
+  string time_string = CurrentDateAndTime();
+  FprintfFlush(stdout, "converter: %s: attempting %s %s %s\n",
+               time_string.c_str(),
+               missing_info.debug_file.c_str(),
+               missing_info.debug_identifier.c_str(),
+               missing_info.version.c_str());
+
+  // The first lookup is always to internal symbol servers.
+  // Always ask the symbol servers identified as "full."
+  vector<string> msss_servers = options.full_internal_msss_servers;
+
+  // If the file is not an .exe file, also ask an additional set of symbol
+  // servers, such as Microsoft's public symbol server.
+  bool is_exe = false;
+
+  if (missing_info.code_file.length() >= 4) {
+    string code_extension =
+        missing_info.code_file.substr(missing_info.code_file.size() - 4);
+
+    // Firefox is a special case: .dll-only servers should be consulted for
+    // its symbols.  This enables us to get its symbols from Mozilla's
+    // symbol server when crashes occur in Google extension code hosted by a
+    // Firefox process.
+    if (_stricmp(code_extension.c_str(), ".exe") == 0 &&
+        _stricmp(missing_info.code_file.c_str(), "firefox.exe") != 0) {
+      is_exe = true;
+    }
+  }
+
+  if (!is_exe) {
+    msss_servers.insert(msss_servers.end(),
+                        options.no_exe_internal_msss_servers.begin(),
+                        options.no_exe_internal_msss_servers.end());
+  }
+
+  // If there are any suitable internal symbol servers, make a request.
+  MSSymbolServerConverter::LocateResult located =
+      MSSymbolServerConverter::LOCATE_FAILURE;
+  string converted_file;
+  if (msss_servers.size() > 0) {
+    // Attempt to fetch the symbol file and convert it.
+    FprintfFlush(stderr, "Making internal request for %s (%s)\n",
+                   missing_info.debug_file.c_str(),
+                   missing_info.debug_identifier.c_str());
+    MSSymbolServerConverter converter(options.local_cache_path, msss_servers);
+    located = converter.LocateAndConvertSymbolFile(missing_info,
+                                                   false,  // keep_symbol_file
+                                                   false,  // keep_pe_file
+                                                   &converted_file,
+                                                   NULL,   // symbol_file
+                                                   NULL);  // pe_file
+    switch (located) {
+      case MSSymbolServerConverter::LOCATE_SUCCESS:
+        FprintfFlush(stderr, "LocateResult = LOCATE_SUCCESS\n");
+        // Upload it.  Don't bother checking the return value.  If this
+        // succeeds, it should disappear from the missing symbol list.
+        // If it fails, something will print an error message indicating
+        // the cause of the failure, and the item will remain on the
+        // missing symbol list.
+        UploadSymbolFile(options.upload_symbols_url, missing_info,
+                         converted_file);
+        remove(converted_file.c_str());
+
+        // Note: this does leave some directories behind that could be
+        // cleaned up.  The directories inside options.local_cache_path for
+        // debug_file/debug_identifier can be removed at this point.
+        break;
+
+      case MSSymbolServerConverter::LOCATE_NOT_FOUND:
+        FprintfFlush(stderr, "LocateResult = LOCATE_NOT_FOUND\n");
+        // The symbol file definitively did not exist. Fall through,
+        // so we can attempt an external query if it's safe to do so.
+        break;
+
+      case MSSymbolServerConverter::LOCATE_RETRY:
+        FprintfFlush(stderr, "LocateResult = LOCATE_RETRY\n");
+        // Fall through in case we should make an external request.
+        // If not, or if an external request fails in the same way,
+        // we'll leave the entry in the symbol file list and
+        // try again on a future pass.  Print a message so that there's
+        // a record.
+        break;
+
+      case MSSymbolServerConverter::LOCATE_FAILURE:
+        FprintfFlush(stderr, "LocateResult = LOCATE_FAILURE\n");
+        // LocateAndConvertSymbolFile printed an error message.
+        break;
+
+      default:
+        FprintfFlush(
+            stderr,
+            "FATAL: Unexpected return value '%d' from "
+            "LocateAndConvertSymbolFile()\n",
+            located);
+        assert(0);
+        break;
+    }
+  } else {
+    // No suitable internal symbol servers.  This is fine because the converter
+    // is mainly used for downloading and converting of external symbols.
+  }
+
+  // Make a request to an external server if the internal request didn't
+  // succeed, and it's safe to do so.
+  if (located != MSSymbolServerConverter::LOCATE_SUCCESS &&
+      SafeToMakeExternalRequest(missing_info, options.blacklist_regex)) {
+    msss_servers = options.full_external_msss_servers;
+    if (!is_exe) {
+      msss_servers.insert(msss_servers.end(),
+                          options.no_exe_external_msss_servers.begin(),
+                          options.no_exe_external_msss_servers.end());
+    }
+    if (msss_servers.size() > 0) {
+      FprintfFlush(stderr, "Making external request for %s (%s)\n",
+                   missing_info.debug_file.c_str(),
+                   missing_info.debug_identifier.c_str());
+      MSSymbolServerConverter external_converter(options.local_cache_path,
+                                                 msss_servers);
+      located = external_converter.LocateAndConvertSymbolFile(
+          missing_info,
+          false,  // keep_symbol_file
+          false,  // keep_pe_file
+          &converted_file,
+          NULL,   // symbol_file
+          NULL);  // pe_file
+    } else {
+      FprintfFlush(stderr, "ERROR: No suitable external symbol servers.\n");
+    }
+  }
+
+  // Final handling for this symbol file is based on the result from the
+  // external request (if performed above), or on the result from the
+  // previous internal lookup.
+  switch (located) {
+    case MSSymbolServerConverter::LOCATE_SUCCESS:
+      FprintfFlush(stderr, "LocateResult = LOCATE_SUCCESS\n");
+      // Upload it.  Don't bother checking the return value.  If this
+      // succeeds, it should disappear from the missing symbol list.
+      // If it fails, something will print an error message indicating
+      // the cause of the failure, and the item will remain on the
+      // missing symbol list.
+      UploadSymbolFile(options.upload_symbols_url, missing_info,
+                       converted_file);
+      remove(converted_file.c_str());
+
+      // Note: this does leave some directories behind that could be
+      // cleaned up.  The directories inside options.local_cache_path for
+      // debug_file/debug_identifier can be removed at this point.
+      break;
+
+    case MSSymbolServerConverter::LOCATE_NOT_FOUND:
+      // The symbol file definitively didn't exist.  Inform the server.
+      // If this fails, something will print an error message indicating
+      // the cause of the failure, but there's really nothing more to
+      // do.  If this succeeds, the entry should be removed from the
+      // missing symbols list.
+      if (!options.report_fetch_failures) {
+        FprintfFlush(stderr, "SendFetchFailedPing skipped\n");
+      } else if (SendFetchFailedPing(options.fetch_symbol_failure_url,
+                                     missing_info)) {
+        FprintfFlush(stderr, "SendFetchFailedPing succeeded\n");
+      } else {
+        FprintfFlush(stderr, "SendFetchFailedPing failed\n");
+      }
+      break;
+
+    case MSSymbolServerConverter::LOCATE_RETRY:
+      FprintfFlush(stderr, "LocateResult = LOCATE_RETRY\n");
+      // Nothing to do but leave the entry in the symbol file list and
+      // try again on a future pass.  Print a message so that there's
+      // a record.
+      FprintfFlush(stderr, "ConvertMissingSymbolFile: deferring retry "
+                           "for %s %s %s\n",
+                   missing_info.debug_file.c_str(),
+                   missing_info.debug_identifier.c_str(),
+                   missing_info.version.c_str());
+      break;
+
+    case MSSymbolServerConverter::LOCATE_FAILURE:
+      FprintfFlush(stderr, "LocateResult = LOCATE_FAILURE\n");
+      // LocateAndConvertSymbolFile printed an error message.
+
+      // This is due to a bad debug file name, so fetch failed.
+      if (!options.report_fetch_failures) {
+        FprintfFlush(stderr, "SendFetchFailedPing skipped\n");
+      } else if (SendFetchFailedPing(options.fetch_symbol_failure_url,
+                                     missing_info)) {
+        FprintfFlush(stderr, "SendFetchFailedPing succeeded\n");
+      } else {
+        FprintfFlush(stderr, "SendFetchFailedPing failed\n");
+      }
+      break;
+
+    default:
+      FprintfFlush(
+          stderr,
+          "FATAL: Unexpected return value '%d' from "
+          "LocateAndConvertSymbolFile()\n",
+          located);
+      assert(0);
+      break;
+  }
+}
+
+
+// Reads the contents of file |file_name| and populates |contents|.
+// Returns true on success.
+static bool ReadFile(string file_name, string *contents) {
+  char buffer[1024 * 8];
+  FILE *fp = fopen(file_name.c_str(), "rt");
+  if (!fp) {
+    return false;
+  }
+  contents->clear();
+  while (fgets(buffer, sizeof(buffer), fp) != NULL) {
+    contents->append(buffer);
+  }
+  fclose(fp);
+  return true;
+}
+
+// ConvertMissingSymbolsList obtains a missing symbol list from
+// |options.missing_symbols_url| or |options.missing_symbols_file| and calls
+// ConvertMissingSymbolFile for each missing symbol file in the list.
+static bool ConvertMissingSymbolsList(const ConverterOptions &options) {
+  // Set param to indicate requesting for encoded response.
+  map<wstring, wstring> parameters;
+  parameters[L"product"] = L"WinSymConv";
+  parameters[L"encoded"] = L"true";
+  // Get the missing symbol list.
+  string missing_symbol_list;
+  if (!options.missing_symbols_file.empty()) {
+    if (!ReadFile(options.missing_symbols_file, &missing_symbol_list)) {
+      return false;
+    }
+  } else if (!HTTPDownload::Download(options.missing_symbols_url, &parameters,
+                                     &missing_symbol_list, NULL)) {
+    return false;
+  }
+
+  // Tokenize the content into a vector.
+  vector<string> missing_symbol_lines;
+  Tokenizer::Tokenize("\n", missing_symbol_list, &missing_symbol_lines);
+
+  FprintfFlush(stderr, "Found %d missing symbol files in list.\n",
+               missing_symbol_lines.size() - 1);  // last line is empty.
+  int convert_attempts = 0;
+  for (vector<string>::const_iterator iterator = missing_symbol_lines.begin();
+       iterator != missing_symbol_lines.end();
+       ++iterator) {
+    // Decode symbol line.
+    const string &encoded_line = *iterator;
+    // Skip lines that are blank.
+    if (encoded_line.empty()) {
+      continue;
+    }
+
+    string line;
+    if (!WebSafeBase64Unescape(encoded_line, &line)) {
+      // If decoding fails, assume the line is not encoded.
+      // This is helpful when the program connects to a debug server without
+      // encoding.
+      line = encoded_line;
+    }
+
+    FprintfFlush(stderr, "\nLine: %s\n", line.c_str());
+
+    // Turn each element into a MissingSymbolInfo structure.
+    MissingSymbolInfo missing_info;
+    if (!ParseMissingString(line, &missing_info)) {
+      FprintfFlush(stderr, "ConvertMissingSymbols: ParseMissingString failed "
+                           "for %s from %ws\n",
+                   line.c_str(), options.missing_symbols_url.c_str());
+      continue;
+    }
+
+    ++convert_attempts;
+    ConvertMissingSymbolFile(missing_info, options);
+  }
+
+  // Say something reassuring, since ConvertMissingSymbolFile was never called
+  // and therefore never reported any progress.
+  if (convert_attempts == 0) {
+    string current_time = CurrentDateAndTime();
+    FprintfFlush(stdout, "converter: %s: nothing to convert\n",
+                 current_time.c_str());
+  }
+
+  return true;
+}
+
+// usage prints the usage message.  It returns 1 as a convenience, to be used
+// as a return value from main.
+static int usage(const char *program_name) {
+  FprintfFlush(stderr,
+      "usage: %s [options]\n"
+      "    -f  <full_msss_server>     MS servers to ask for all symbols\n"
+      "    -n  <no_exe_msss_server>   same, but prevent asking for EXEs\n"
+      "    -l  <local_cache_path>     Temporary local storage for symbols\n"
+      "    -s  <upload_url>           URL for uploading symbols\n"
+      "    -m  <missing_symbols_url>  URL to fetch list of missing symbols\n"
+      "    -mf <missing_symbols_file> File containing the list of missing\n"
+      "                               symbols.  Fetch failures are not\n"
+      "                               reported if such file is provided.\n"
+      "    -t  <fetch_failure_url>    URL to report symbol fetch failure\n"
+      "    -b  <regex>                Regex used to blacklist files to\n"
+      "                               prevent external symbol requests\n"
+      " Note that any server specified by -f or -n that starts with \\filer\n"
+      " will be treated as internal, and all others as external.\n",
+      program_name);
+
+  return 1;
+}
+
+// "Internal" servers consist only of those whose names start with
+// the literal string "\\filer\".
+static bool IsInternalServer(const string &server_name) {
+  if (server_name.find("\\\\filer\\") == 0) {
+    return true;
+  }
+  return false;
+}
+
+// Adds a server with the given name to the list of internal or external
+// servers, as appropriate.
+static void AddServer(const string &server_name,
+                      vector<string> *internal_servers,
+                      vector<string> *external_servers) {
+  if (IsInternalServer(server_name)) {
+    internal_servers->push_back(server_name);
+  } else {
+    external_servers->push_back(server_name);
+  }
+}
+
+}  // namespace
+
+int main(int argc, char **argv) {
+  string time_string = CurrentDateAndTime();
+  FprintfFlush(stdout, "converter: %s: starting\n", time_string.c_str());
+
+  ConverterOptions options;
+  options.report_fetch_failures = true;
+
+  // All arguments are paired.
+  if (argc % 2 != 1) {
+    return usage(argv[0]);
+  }
+  string blacklist_regex_str;
+  bool have_any_msss_servers = false;
+  for (int argi = 1; argi < argc; argi += 2) {
+    string option = argv[argi];
+    string value = argv[argi + 1];
+
+    if (option == "-f") {
+      AddServer(value, &options.full_internal_msss_servers,
+                &options.full_external_msss_servers);
+      have_any_msss_servers = true;
+    } else if (option == "-n") {
+      AddServer(value, &options.no_exe_internal_msss_servers,
+                &options.no_exe_external_msss_servers);
+      have_any_msss_servers = true;
+    } else if (option == "-l") {
+      if (!options.local_cache_path.empty()) {
+        return usage(argv[0]);
+      }
+      options.local_cache_path = value;
+    } else if (option == "-s") {
+      if (!WindowsStringUtils::safe_mbstowcs(value,
+                                             &options.upload_symbols_url)) {
+        FprintfFlush(stderr, "main: safe_mbstowcs failed for %s\n",
+                     value.c_str());
+        return 1;
+      }
+    } else if (option == "-m") {
+      if (!WindowsStringUtils::safe_mbstowcs(value,
+                                             &options.missing_symbols_url)) {
+        FprintfFlush(stderr, "main: safe_mbstowcs failed for %s\n",
+                     value.c_str());
+        return 1;
+      }
+    } else if (option == "-mf") {
+      options.missing_symbols_file = value;
+      printf("Getting the list of missing symbols from a file.  Fetch failures"
+             " will not be reported.\n");
+      options.report_fetch_failures = false;
+    } else if (option == "-t") {
+      if (!WindowsStringUtils::safe_mbstowcs(
+          value,
+          &options.fetch_symbol_failure_url)) {
+        FprintfFlush(stderr, "main: safe_mbstowcs failed for %s\n",
+                     value.c_str());
+        return 1;
+      }
+    } else if (option == "-b") {
+      blacklist_regex_str = value;
+    } else {
+      return usage(argv[0]);
+    }
+  }
+
+  if (blacklist_regex_str.empty()) {
+    FprintfFlush(stderr, "No blacklist specified.\n");
+    return usage(argv[0]);
+  }
+
+  // Compile the blacklist regular expression for later use.
+  options.blacklist_regex = std::regex(blacklist_regex_str.c_str(),
+      std::regex_constants::icase);
+
+  // Set the defaults.  If the user specified any MSSS servers, don't use
+  // any default.
+  if (!have_any_msss_servers) {
+    AddServer(kNoExeMSSSServer, &options.no_exe_internal_msss_servers,
+        &options.no_exe_external_msss_servers);
+  }
+
+  if (options.local_cache_path.empty()) {
+    options.local_cache_path = kLocalCachePath;
+  }
+
+  if (options.upload_symbols_url.empty()) {
+    FprintfFlush(stderr, "No upload symbols URL specified.\n");
+    return usage(argv[0]);
+  }
+  if (options.missing_symbols_url.empty()) {
+    FprintfFlush(stderr, "No missing symbols URL specified.\n");
+    return usage(argv[0]);
+  }
+  if (options.fetch_symbol_failure_url.empty()) {
+    FprintfFlush(stderr, "No fetch symbol failure URL specified.\n");
+    return usage(argv[0]);
+  }
+
+  FprintfFlush(stdout,
+               "# of Symbol Servers (int/ext): %d/%d full, %d/%d no_exe\n",
+               options.full_internal_msss_servers.size(),
+               options.full_external_msss_servers.size(),
+               options.no_exe_internal_msss_servers.size(),
+               options.no_exe_external_msss_servers.size());
+
+  if (!ConvertMissingSymbolsList(options)) {
+    return 1;
+  }
+
+  time_string = CurrentDateAndTime();
+  FprintfFlush(stdout, "converter: %s: finished\n", time_string.c_str());
+  return 0;
+}
diff --git a/src/tools/windows/converter_exe/converter.gyp b/src/tools/windows/converter_exe/converter.gyp
new file mode 100644
index 0000000..fe443d1
--- /dev/null
+++ b/src/tools/windows/converter_exe/converter.gyp
@@ -0,0 +1,57 @@
+# Copyright 2013 Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+{
+  'includes': [
+    '../../../build/common.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'converter_exe',
+      'type': 'executable',
+      'sources': [
+        'converter.cc',
+        'escaping.cc',
+        'escaping.h',
+        'http_client.h',
+        'http_download.cc',
+        'http_download.h',
+        'tokenizer.cc',
+        'tokenizer.h',
+        'winhttp_client.cc',
+        'winhttp_client.h',
+        'wininet_client.cc',
+        'wininet_client.h',
+      ],
+      'dependencies': [
+        '../../../common/windows/common_windows.gyp:common_windows_lib',
+        '../converter/ms_symbol_server_converter.gyp:ms_symbol_server_converter',
+      ],
+    },
+  ],
+}
diff --git a/src/tools/windows/converter_exe/escaping.cc b/src/tools/windows/converter_exe/escaping.cc
new file mode 100644
index 0000000..e26bbeb
--- /dev/null
+++ b/src/tools/windows/converter_exe/escaping.cc
@@ -0,0 +1,757 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "tools/windows/converter_exe/escaping.h"
+
+#include <assert.h>
+
+#define kApb kAsciiPropertyBits
+
+const unsigned char kAsciiPropertyBits[256] = {
+  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x00
+  0x40, 0x68, 0x48, 0x48, 0x48, 0x48, 0x40, 0x40,
+  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  // 0x10
+  0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
+  0x28, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,  // 0x20
+  0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+  0x84, 0x84, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,
+  0x10, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x05,  // 0x40
+  0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
+  0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,  // 0x50
+  0x05, 0x05, 0x05, 0x10, 0x10, 0x10, 0x10, 0x10,
+  0x10, 0x85, 0x85, 0x85, 0x85, 0x85, 0x85, 0x05,  // 0x60
+  0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
+  0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,  // 0x70
+  0x05, 0x05, 0x05, 0x10, 0x10, 0x10, 0x10, 0x40,
+};
+
+// Use !! to suppress the warning C4800 of forcing 'int' to 'bool'.
+static inline bool ascii_isspace(unsigned char c) { return !!(kApb[c] & 0x08); }
+
+///////////////////////////////////
+// scoped_array
+///////////////////////////////////
+// scoped_array<C> is like scoped_ptr<C>, except that the caller must allocate
+// with new [] and the destructor deletes objects with delete [].
+//
+// As with scoped_ptr<C>, a scoped_array<C> either points to an object
+// or is NULL.  A scoped_array<C> owns the object that it points to.
+// scoped_array<T> is thread-compatible, and once you index into it,
+// the returned objects have only the threadsafety guarantees of T.
+//
+// Size: sizeof(scoped_array<C>) == sizeof(C*)
+template <class C>
+class scoped_array {
+ public:
+
+  // The element type
+  typedef C element_type;
+
+  // Constructor.  Defaults to intializing with NULL.
+  // There is no way to create an uninitialized scoped_array.
+  // The input parameter must be allocated with new [].
+  explicit scoped_array(C* p = NULL) : array_(p) { }
+
+  // Destructor.  If there is a C object, delete it.
+  // We don't need to test ptr_ == NULL because C++ does that for us.
+  ~scoped_array() {
+    enum { type_must_be_complete = sizeof(C) };
+    delete[] array_;
+  }
+
+  // Reset.  Deletes the current owned object, if any.
+  // Then takes ownership of a new object, if given.
+  // this->reset(this->get()) works.
+  void reset(C* p = NULL) {
+    if (p != array_) {
+      enum { type_must_be_complete = sizeof(C) };
+      delete[] array_;
+      array_ = p;
+    }
+  }
+
+  // Get one element of the current object.
+  // Will assert() if there is no current object, or index i is negative.
+  C& operator[](std::ptrdiff_t i) const {
+    assert(i >= 0);
+    assert(array_ != NULL);
+    return array_[i];
+  }
+
+  // Get a pointer to the zeroth element of the current object.
+  // If there is no current object, return NULL.
+  C* get() const {
+    return array_;
+  }
+
+  // Comparison operators.
+  // These return whether a scoped_array and a raw pointer refer to
+  // the same array, not just to two different but equal arrays.
+  bool operator==(const C* p) const { return array_ == p; }
+  bool operator!=(const C* p) const { return array_ != p; }
+
+  // Swap two scoped arrays.
+  void swap(scoped_array& p2) {
+    C* tmp = array_;
+    array_ = p2.array_;
+    p2.array_ = tmp;
+  }
+
+  // Release an array.
+  // The return value is the current pointer held by this object.
+  // If this object holds a NULL pointer, the return value is NULL.
+  // After this operation, this object will hold a NULL pointer,
+  // and will not own the object any more.
+  C* release() {
+    C* retVal = array_;
+    array_ = NULL;
+    return retVal;
+  }
+
+ private:
+  C* array_;
+
+  // Forbid comparison of different scoped_array types.
+  template <class C2> bool operator==(scoped_array<C2> const& p2) const;
+  template <class C2> bool operator!=(scoped_array<C2> const& p2) const;
+
+  // Disallow evil constructors
+  scoped_array(const scoped_array&);
+  void operator=(const scoped_array&);
+};
+
+
+///////////////////////////////////
+// Escape methods
+///////////////////////////////////
+
+namespace strings {
+
+// Return a mutable char* pointing to a string's internal buffer,
+// which may not be null-terminated. Writing through this pointer will
+// modify the string.
+//
+// string_as_array(&str)[i] is valid for 0 <= i < str.size() until the
+// next call to a string method that invalidates iterators.
+//
+// As of 2006-04, there is no standard-blessed way of getting a
+// mutable reference to a string's internal buffer. However, issue 530
+// (http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#530)
+// proposes this as the method. According to Matt Austern, this should
+// already work on all current implementations.
+inline char* string_as_array(string* str) {
+  // DO NOT USE const_cast<char*>(str->data())! See the unittest for why.
+  return str->empty() ? NULL : &*str->begin();
+}
+
+int CalculateBase64EscapedLen(int input_len, bool do_padding) {
+  // these formulae were copied from comments that used to go with the base64
+  // encoding functions
+  int intermediate_result = 8 * input_len + 5;
+  assert(intermediate_result > 0);     // make sure we didn't overflow
+  int len = intermediate_result / 6;
+  if (do_padding) len = ((len + 3) / 4) * 4;
+  return len;
+}
+
+// Base64Escape does padding, so this calculation includes padding.
+int CalculateBase64EscapedLen(int input_len) {
+  return CalculateBase64EscapedLen(input_len, true);
+}
+
+// ----------------------------------------------------------------------
+// int Base64Unescape() - base64 decoder
+// int Base64Escape() - base64 encoder
+// int WebSafeBase64Unescape() - Google's variation of base64 decoder
+// int WebSafeBase64Escape() - Google's variation of base64 encoder
+//
+// Check out
+// http://www.cis.ohio-state.edu/htbin/rfc/rfc2045.html for formal
+// description, but what we care about is that...
+//   Take the encoded stuff in groups of 4 characters and turn each
+//   character into a code 0 to 63 thus:
+//           A-Z map to 0 to 25
+//           a-z map to 26 to 51
+//           0-9 map to 52 to 61
+//           +(- for WebSafe) maps to 62
+//           /(_ for WebSafe) maps to 63
+//   There will be four numbers, all less than 64 which can be represented
+//   by a 6 digit binary number (aaaaaa, bbbbbb, cccccc, dddddd respectively).
+//   Arrange the 6 digit binary numbers into three bytes as such:
+//   aaaaaabb bbbbcccc ccdddddd
+//   Equals signs (one or two) are used at the end of the encoded block to
+//   indicate that the text was not an integer multiple of three bytes long.
+// ----------------------------------------------------------------------
+
+int Base64UnescapeInternal(const char *src, int szsrc,
+                           char *dest, int szdest,
+                           const signed char* unbase64) {
+  static const char kPad64 = '=';
+
+  int decode = 0;
+  int destidx = 0;
+  int state = 0;
+  unsigned int ch = 0;
+  unsigned int temp = 0;
+
+  // The GET_INPUT macro gets the next input character, skipping
+  // over any whitespace, and stopping when we reach the end of the
+  // string or when we read any non-data character.  The arguments are
+  // an arbitrary identifier (used as a label for goto) and the number
+  // of data bytes that must remain in the input to avoid aborting the
+  // loop.
+#define GET_INPUT(label, remain)                 \
+  label:                                         \
+    --szsrc;                                     \
+    ch = *src++;                                 \
+    decode = unbase64[ch];                       \
+    if (decode < 0) {                            \
+      if (ascii_isspace((char)ch) && szsrc >= remain)  \
+        goto label;                              \
+      state = 4 - remain;                        \
+      break;                                     \
+    }
+
+  // if dest is null, we're just checking to see if it's legal input
+  // rather than producing output.  (I suspect this could just be done
+  // with a regexp...).  We duplicate the loop so this test can be
+  // outside it instead of in every iteration.
+
+  if (dest) {
+    // This loop consumes 4 input bytes and produces 3 output bytes
+    // per iteration.  We can't know at the start that there is enough
+    // data left in the string for a full iteration, so the loop may
+    // break out in the middle; if so 'state' will be set to the
+    // number of input bytes read.
+
+    while (szsrc >= 4)  {
+      // We'll start by optimistically assuming that the next four
+      // bytes of the string (src[0..3]) are four good data bytes
+      // (that is, no nulls, whitespace, padding chars, or illegal
+      // chars).  We need to test src[0..2] for nulls individually
+      // before constructing temp to preserve the property that we
+      // never read past a null in the string (no matter how long
+      // szsrc claims the string is).
+
+      if (!src[0] || !src[1] || !src[2] ||
+          (temp = ((unbase64[src[0]] << 18) |
+                   (unbase64[src[1]] << 12) |
+                   (unbase64[src[2]] << 6) |
+                   (unbase64[src[3]]))) & 0x80000000) {
+        // Iff any of those four characters was bad (null, illegal,
+        // whitespace, padding), then temp's high bit will be set
+        // (because unbase64[] is -1 for all bad characters).
+        //
+        // We'll back up and resort to the slower decoder, which knows
+        // how to handle those cases.
+
+        GET_INPUT(first, 4);
+        temp = decode;
+        GET_INPUT(second, 3);
+        temp = (temp << 6) | decode;
+        GET_INPUT(third, 2);
+        temp = (temp << 6) | decode;
+        GET_INPUT(fourth, 1);
+        temp = (temp << 6) | decode;
+      } else {
+        // We really did have four good data bytes, so advance four
+        // characters in the string.
+
+        szsrc -= 4;
+        src += 4;
+        decode = -1;
+        ch = '\0';
+      }
+
+      // temp has 24 bits of input, so write that out as three bytes.
+
+      if (destidx+3 > szdest) return -1;
+      dest[destidx+2] = (char)temp;
+      temp >>= 8;
+      dest[destidx+1] = (char)temp;
+      temp >>= 8;
+      dest[destidx] = (char)temp;
+      destidx += 3;
+    }
+  } else {
+    while (szsrc >= 4)  {
+      if (!src[0] || !src[1] || !src[2] ||
+          (temp = ((unbase64[src[0]] << 18) |
+                   (unbase64[src[1]] << 12) |
+                   (unbase64[src[2]] << 6) |
+                   (unbase64[src[3]]))) & 0x80000000) {
+        GET_INPUT(first_no_dest, 4);
+        GET_INPUT(second_no_dest, 3);
+        GET_INPUT(third_no_dest, 2);
+        GET_INPUT(fourth_no_dest, 1);
+      } else {
+        szsrc -= 4;
+        src += 4;
+        decode = -1;
+        ch = '\0';
+      }
+      destidx += 3;
+    }
+  }
+
+#undef GET_INPUT
+
+  // if the loop terminated because we read a bad character, return
+  // now.
+  if (decode < 0 && ch != '\0' && ch != kPad64 && !ascii_isspace((char)ch))
+    return -1;
+
+  if (ch == kPad64) {
+    // if we stopped by hitting an '=', un-read that character -- we'll
+    // look at it again when we count to check for the proper number of
+    // equals signs at the end.
+    ++szsrc;
+    --src;
+  } else {
+    // This loop consumes 1 input byte per iteration.  It's used to
+    // clean up the 0-3 input bytes remaining when the first, faster
+    // loop finishes.  'temp' contains the data from 'state' input
+    // characters read by the first loop.
+    while (szsrc > 0)  {
+      --szsrc;
+      ch = *src++;
+      decode = unbase64[ch];
+      if (decode < 0) {
+        if (ascii_isspace((char)ch)) {
+          continue;
+        } else if (ch == '\0') {
+          break;
+        } else if (ch == kPad64) {
+          // back up one character; we'll read it again when we check
+          // for the correct number of equals signs at the end.
+          ++szsrc;
+          --src;
+          break;
+        } else {
+          return -1;
+        }
+      }
+
+      // Each input character gives us six bits of output.
+      temp = (temp << 6) | decode;
+      ++state;
+      if (state == 4) {
+        // If we've accumulated 24 bits of output, write that out as
+        // three bytes.
+        if (dest) {
+          if (destidx+3 > szdest) return -1;
+          dest[destidx+2] = (char)temp;
+          temp >>= 8;
+          dest[destidx+1] = (char)temp;
+          temp >>= 8;
+          dest[destidx] = (char)temp;
+        }
+        destidx += 3;
+        state = 0;
+        temp = 0;
+      }
+    }
+  }
+
+  // Process the leftover data contained in 'temp' at the end of the input.
+  int expected_equals = 0;
+  switch (state) {
+    case 0:
+      // Nothing left over; output is a multiple of 3 bytes.
+      break;
+
+    case 1:
+      // Bad input; we have 6 bits left over.
+      return -1;
+
+    case 2:
+      // Produce one more output byte from the 12 input bits we have left.
+      if (dest) {
+        if (destidx+1 > szdest) return -1;
+        temp >>= 4;
+        dest[destidx] = (char)temp;
+      }
+      ++destidx;
+      expected_equals = 2;
+      break;
+
+    case 3:
+      // Produce two more output bytes from the 18 input bits we have left.
+      if (dest) {
+        if (destidx+2 > szdest) return -1;
+        temp >>= 2;
+        dest[destidx+1] = (char)temp;
+        temp >>= 8;
+        dest[destidx] = (char)temp;
+      }
+      destidx += 2;
+      expected_equals = 1;
+      break;
+
+    default:
+      // state should have no other values at this point.
+      fprintf(stdout, "This can't happen; base64 decoder state = %d", state);
+  }
+
+  // The remainder of the string should be all whitespace, mixed with
+  // exactly 0 equals signs, or exactly 'expected_equals' equals
+  // signs.  (Always accepting 0 equals signs is a google extension
+  // not covered in the RFC.)
+
+  int equals = 0;
+  while (szsrc > 0 && *src) {
+    if (*src == kPad64)
+      ++equals;
+    else if (!ascii_isspace(*src))
+      return -1;
+    --szsrc;
+    ++src;
+  }
+
+  return (equals == 0 || equals == expected_equals) ? destidx : -1;
+}
+
+int Base64Unescape(const char *src, int szsrc, char *dest, int szdest) {
+  static const signed char UnBase64[] = {
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      62/*+*/, -1,      -1,      -1,      63/*/ */,
+     52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
+     60/*8*/, 61/*9*/, -1,      -1,      -1,      -1,      -1,      -1,
+     -1,       0/*A*/,  1/*B*/,  2/*C*/,  3/*D*/,  4/*E*/,  5/*F*/,  6/*G*/,
+      7/*H*/,  8/*I*/,  9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
+     15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
+     23/*X*/, 24/*Y*/, 25/*Z*/, -1,      -1,      -1,      -1,      -1,
+     -1,      26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
+     33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
+     41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
+     49/*x*/, 50/*y*/, 51/*z*/, -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1
+  };
+  // The above array was generated by the following code
+  // #include <sys/time.h>
+  // #include <stdlib.h>
+  // #include <string.h>
+  // main()
+  // {
+  //   static const char Base64[] =
+  //     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+  //   char *pos;
+  //   int idx, i, j;
+  //   printf("    ");
+  //   for (i = 0; i < 255; i += 8) {
+  //     for (j = i; j < i + 8; j++) {
+  //       pos = strchr(Base64, j);
+  //       if ((pos == NULL) || (j == 0))
+  //         idx = -1;
+  //       else
+  //         idx = pos - Base64;
+  //       if (idx == -1)
+  //         printf(" %2d,     ", idx);
+  //       else
+  //         printf(" %2d/*%c*/,", idx, j);
+  //     }
+  //     printf("\n    ");
+  //   }
+  // }
+
+  return Base64UnescapeInternal(src, szsrc, dest, szdest, UnBase64);
+}
+
+bool Base64Unescape(const char *src, int slen, string* dest) {
+  // Determine the size of the output string.  Base64 encodes every 3 bytes into
+  // 4 characters.  any leftover chars are added directly for good measure.
+  // This is documented in the base64 RFC: http://www.ietf.org/rfc/rfc3548.txt
+  const int dest_len = 3 * (slen / 4) + (slen % 4);
+
+  dest->resize(dest_len);
+
+  // We are getting the destination buffer by getting the beginning of the
+  // string and converting it into a char *.
+  const int len = Base64Unescape(src, slen,
+                                 string_as_array(dest), dest->size());
+  if (len < 0) {
+    return false;
+  }
+
+  // could be shorter if there was padding
+  assert(len <= dest_len);
+  dest->resize(len);
+
+  return true;
+}
+
+// Base64Escape
+//
+// NOTE: We have to use an unsigned type for src because code built
+// in the the /google tree treats characters as signed unless
+// otherwised specified.
+//
+// TODO(who?): Move this function to use the char* type for "src"
+int Base64EscapeInternal(const unsigned char *src, int szsrc,
+                         char *dest, int szdest, const char *base64,
+                         bool do_padding) {
+  static const char kPad64 = '=';
+
+  if (szsrc <= 0) return 0;
+
+  char *cur_dest = dest;
+  const unsigned char *cur_src = src;
+
+  // Three bytes of data encodes to four characters of cyphertext.
+  // So we can pump through three-byte chunks atomically.
+  while (szsrc > 2) { /* keep going until we have less than 24 bits */
+    if ((szdest -= 4) < 0) return 0;
+    cur_dest[0] = base64[cur_src[0] >> 2];
+    cur_dest[1] = base64[((cur_src[0] & 0x03) << 4) + (cur_src[1] >> 4)];
+    cur_dest[2] = base64[((cur_src[1] & 0x0f) << 2) + (cur_src[2] >> 6)];
+    cur_dest[3] = base64[cur_src[2] & 0x3f];
+
+    cur_dest += 4;
+    cur_src += 3;
+    szsrc -= 3;
+  }
+
+  /* now deal with the tail (<=2 bytes) */
+  switch (szsrc) {
+    case 0:
+      // Nothing left; nothing more to do.
+      break;
+    case 1:
+      // One byte left: this encodes to two characters, and (optionally)
+      // two pad characters to round out the four-character cypherblock.
+      if ((szdest -= 2) < 0) return 0;
+      cur_dest[0] = base64[cur_src[0] >> 2];
+      cur_dest[1] = base64[(cur_src[0] & 0x03) << 4];
+      cur_dest += 2;
+      if (do_padding) {
+        if ((szdest -= 2) < 0) return 0;
+        cur_dest[0] = kPad64;
+        cur_dest[1] = kPad64;
+        cur_dest += 2;
+      }
+      break;
+    case 2:
+      // Two bytes left: this encodes to three characters, and (optionally)
+      // one pad character to round out the four-character cypherblock.
+      if ((szdest -= 3) < 0) return 0;
+      cur_dest[0] = base64[cur_src[0] >> 2];
+      cur_dest[1] = base64[((cur_src[0] & 0x03) << 4) + (cur_src[1] >> 4)];
+      cur_dest[2] = base64[(cur_src[1] & 0x0f) << 2];
+      cur_dest += 3;
+      if (do_padding) {
+        if ((szdest -= 1) < 0) return 0;
+        cur_dest[0] = kPad64;
+        cur_dest += 1;
+      }
+      break;
+    default:
+      // Should not be reached: blocks of 3 bytes are handled
+      // in the while loop before this switch statement.
+      fprintf(stderr, "Logic problem? szsrc = %d",  szsrc);
+      assert(false);
+      break;
+  }
+  return (cur_dest - dest);
+}
+
+static const char kBase64Chars[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static const char kWebSafeBase64Chars[] =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
+int Base64Escape(const unsigned char *src, int szsrc, char *dest, int szdest) {
+  return Base64EscapeInternal(src, szsrc, dest, szdest, kBase64Chars, true);
+}
+
+void Base64Escape(const unsigned char *src, int szsrc,
+                  string* dest, bool do_padding) {
+  const int max_escaped_size =
+    CalculateBase64EscapedLen(szsrc, do_padding);
+  dest->clear();
+  dest->resize(max_escaped_size + 1, '\0');
+  const int escaped_len = Base64EscapeInternal(src, szsrc,
+                                               &*dest->begin(), dest->size(),
+                                               kBase64Chars,
+                                               do_padding);
+  assert(max_escaped_size <= escaped_len);
+  dest->resize(escaped_len);
+}
+
+void Base64Escape(const string& src, string* dest) {
+  Base64Escape(reinterpret_cast<const unsigned char*>(src.c_str()),
+               src.size(), dest, true);
+}
+
+////////////////////////////////////////////////////
+// WebSafe methods
+////////////////////////////////////////////////////
+
+int WebSafeBase64Unescape(const char *src, int szsrc, char *dest, int szdest) {
+  static const signed char UnBase64[] = {
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      62/*-*/, -1,      -1,
+     52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/,
+     60/*8*/, 61/*9*/, -1,      -1,      -1,      -1,      -1,      -1,
+     -1,       0/*A*/,  1/*B*/,  2/*C*/,  3/*D*/,  4/*E*/,  5/*F*/,  6/*G*/,
+      7/*H*/,  8/*I*/,  9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/,
+     15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/,
+     23/*X*/, 24/*Y*/, 25/*Z*/, -1,      -1,      -1,      -1,      63/*_*/,
+     -1,      26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/,
+     33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/,
+     41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/,
+     49/*x*/, 50/*y*/, 51/*z*/, -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1,
+     -1,      -1,      -1,      -1,      -1,      -1,      -1,      -1
+  };
+  // The above array was generated by the following code
+  // #include <sys/time.h>
+  // #include <stdlib.h>
+  // #include <string.h>
+  // main()
+  // {
+  //   static const char Base64[] =
+  //     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+  //   char *pos;
+  //   int idx, i, j;
+  //   printf("    ");
+  //   for (i = 0; i < 255; i += 8) {
+  //     for (j = i; j < i + 8; j++) {
+  //       pos = strchr(Base64, j);
+  //       if ((pos == NULL) || (j == 0))
+  //         idx = -1;
+  //       else
+  //         idx = pos - Base64;
+  //       if (idx == -1)
+  //         printf(" %2d,     ", idx);
+  //       else
+  //         printf(" %2d/*%c*/,", idx, j);
+  //     }
+  //     printf("\n    ");
+  //   }
+  // }
+
+  return Base64UnescapeInternal(src, szsrc, dest, szdest, UnBase64);
+}
+
+bool WebSafeBase64Unescape(const char *src, int slen, string* dest) {
+  int dest_len = 3 * (slen / 4) + (slen % 4);
+  dest->clear();
+  dest->resize(dest_len);
+  int len = WebSafeBase64Unescape(src, slen, &*dest->begin(), dest->size());
+  if (len < 0) {
+    dest->clear();
+    return false;
+  }
+  // could be shorter if there was padding
+  assert(len <= dest_len);
+  dest->resize(len);
+  return true;
+}
+
+bool WebSafeBase64Unescape(const string& src, string* dest) {
+  return WebSafeBase64Unescape(src.data(), src.size(), dest);
+}
+
+int WebSafeBase64Escape(const unsigned char *src, int szsrc, char *dest,
+                        int szdest, bool do_padding) {
+  return Base64EscapeInternal(src, szsrc, dest, szdest,
+                              kWebSafeBase64Chars, do_padding);
+}
+
+void WebSafeBase64Escape(const unsigned char *src, int szsrc,
+                         string *dest, bool do_padding) {
+  const int max_escaped_size =
+    CalculateBase64EscapedLen(szsrc, do_padding);
+  dest->clear();
+  dest->resize(max_escaped_size + 1, '\0');
+  const int escaped_len = Base64EscapeInternal(src, szsrc,
+                                               &*dest->begin(), dest->size(),
+                                               kWebSafeBase64Chars,
+                                               do_padding);
+  assert(max_escaped_size <= escaped_len);
+  dest->resize(escaped_len);
+}
+
+void WebSafeBase64EscapeInternal(const string& src,
+                                 string* dest,
+                                 bool do_padding) {
+  int encoded_len = CalculateBase64EscapedLen(src.size());
+  scoped_array<char> buf(new char[encoded_len]);
+  int len = WebSafeBase64Escape(reinterpret_cast<const unsigned char*>(src.c_str()),
+                                src.size(), buf.get(),
+                                encoded_len, do_padding);
+  dest->assign(buf.get(), len);
+}
+
+void WebSafeBase64Escape(const string& src, string* dest) {
+  WebSafeBase64EscapeInternal(src, dest, false);
+}
+
+void WebSafeBase64EscapeWithPadding(const string& src, string* dest) {
+  WebSafeBase64EscapeInternal(src, dest, true);
+}
+
+}  // namespace strings
diff --git a/src/tools/windows/converter_exe/escaping.h b/src/tools/windows/converter_exe/escaping.h
new file mode 100644
index 0000000..c8aa90b
--- /dev/null
+++ b/src/tools/windows/converter_exe/escaping.h
@@ -0,0 +1,99 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Base64 escaping methods to encode/decode strings.
+
+#ifndef TOOLS_WINDOWS_CONVERTER_EXE_ESCAPING_H_
+#define TOOLS_WINDOWS_CONVERTER_EXE_ESCAPING_H_
+
+#include <string>
+
+namespace strings {
+
+using std::string;
+
+// ----------------------------------------------------------------------
+// Base64Escape()
+// WebSafeBase64Escape()
+//    Encode "src" to "dest" using base64 encoding.
+//    src is not null terminated, instead specify len.
+//    'dest' should have at least CalculateBase64EscapedLen() length.
+//    RETURNS the length of dest.
+//    The WebSafe variation use '-' instead of '+' and '_' instead of '/'
+//    so that we can place the out in the URL or cookies without having
+//    to escape them.  It also has an extra parameter "do_padding",
+//    which when set to false will prevent padding with "=".
+// ----------------------------------------------------------------------
+void Base64Escape(const string& src, string* dest);
+int Base64Escape(const unsigned char* src, int slen, char* dest, int szdest);
+// Encode src into dest with padding.
+void Base64Escape(const unsigned char* src, int szsrc,
+                  string* dest, bool do_padding);
+
+int WebSafeBase64Escape(const unsigned char* src, int slen, char* dest,
+                        int szdest, bool do_padding);
+// Encode src into dest web-safely without padding.
+void WebSafeBase64Escape(const string& src, string* dest);
+// Encode src into dest web-safely with padding.
+void WebSafeBase64EscapeWithPadding(const string& src, string* dest);
+void WebSafeBase64Escape(const unsigned char* src, int szsrc,
+                         string* dest, bool do_padding);
+
+// ----------------------------------------------------------------------
+// Base64Unescape()
+// WebSafeBase64Unescape()
+//    Copies "src" to "dest", where src is in base64 and is written to its
+//    ASCII equivalents. src is not null terminated, instead specify len.
+//    I recommend that slen<szdest, but we honor szdest anyway.
+//    RETURNS the length of dest, or -1 if src contains invalid chars.
+//    The WebSafe variation use '-' instead of '+' and '_' instead of '/'.
+//    The variations that store into a string clear the string first, and
+//    return false (with dest empty) if src contains invalid chars; for
+//    these versions src and dest must be different strings.
+// ----------------------------------------------------------------------
+int Base64Unescape(const char* src, int slen, char* dest, int szdest);
+bool Base64Unescape(const char* src, int slen, string* dest);
+inline bool Base64Unescape(const string& src, string* dest) {
+  return Base64Unescape(src.data(), src.size(), dest);
+}
+
+
+int WebSafeBase64Unescape(const char* src, int slen, char* dest, int szdest);
+bool WebSafeBase64Unescape(const char* src, int slen, string* dest);
+bool WebSafeBase64Unescape(const string& src, string* dest);
+
+// Return the length to use for the output buffer given to the base64 escape
+// routines. Make sure to use the same value for do_padding in both.
+// This function may return incorrect results if given input_len values that
+// are extremely high, which should happen rarely.
+int CalculateBase64EscapedLen(int input_len, bool do_padding);
+// Use this version when calling Base64Escape without a do_padding arg.
+int CalculateBase64EscapedLen(int input_len);
+}  // namespace strings
+
+#endif  // TOOLS_WINDOWS_CONVERTER_EXE_ESCAPING_H_
diff --git a/src/tools/windows/converter_exe/http_client.h b/src/tools/windows/converter_exe/http_client.h
new file mode 100644
index 0000000..3e7aa8a
--- /dev/null
+++ b/src/tools/windows/converter_exe/http_client.h
@@ -0,0 +1,96 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef TOOLS_CRASH_CONVERTER_WINDOWS_HTTP_CLIENT_H_
+#define TOOLS_CRASH_CONVERTER_WINDOWS_HTTP_CLIENT_H_
+
+#include <tchar.h>
+#include <windows.h>
+#include <vector>
+
+typedef void* HttpHandle;
+
+namespace crash {
+
+// HttpClient provides an abstract layer for HTTP APIs. The actual
+// implementation can be based on either WinHttp or WinInet.
+class HttpClient {
+ public:
+  enum AccessType {
+    ACCESS_TYPE_PRECONFIG,
+    ACCESS_TYPE_DIRECT,
+    ACCESS_TYPE_PROXY,
+  };
+
+  virtual ~HttpClient() {}
+
+  virtual bool CrackUrl(const TCHAR* url,
+                        DWORD flags,
+                        TCHAR* scheme,
+                        size_t scheme_buffer_length,
+                        TCHAR* host,
+                        size_t host_buffer_length,
+                        TCHAR* uri,
+                        size_t uri_buffer_length,
+                        int* port) const = 0;
+  virtual bool Open(const TCHAR* user_agent,
+                    DWORD access_type,
+                    const TCHAR* proxy_name,
+                    const TCHAR* proxy_bypass,
+                    HttpHandle* session_handle) const = 0;
+  virtual bool Connect(HttpHandle session_handle,
+                       const TCHAR* server,
+                       int port,
+                       HttpHandle* connection_handle) const = 0;
+  virtual bool OpenRequest(HttpHandle connection_handle,
+                           const TCHAR* verb,
+                           const TCHAR* uri,
+                           const TCHAR* version,
+                           const TCHAR* referrer,
+                           bool is_secure,
+                           HttpHandle* request_handle) const = 0;
+  virtual bool SendRequest(HttpHandle request_handle,
+                           const TCHAR* headers,
+                           DWORD headers_length) const = 0;
+  virtual bool ReceiveResponse(HttpHandle request_handle) const = 0;
+  virtual bool GetHttpStatusCode(HttpHandle request_handle,
+                                 int* status_code) const = 0;
+  virtual bool GetContentLength(HttpHandle request_handle,
+                                DWORD* content_length) const = 0;
+  virtual bool ReadData(HttpHandle request_handle,
+                        void* buffer,
+                        DWORD buffer_length,
+                        DWORD* bytes_read) const = 0;
+  virtual bool Close(HttpHandle handle) const = 0;
+
+  static const DWORD kUnknownContentLength = (DWORD)-1;
+};
+
+}  // namespace crash
+
+#endif  // TOOLS_CRASH_CONVERTER_WINDOWS_HTTP_CLIENT_H_
diff --git a/src/tools/windows/converter_exe/http_download.cc b/src/tools/windows/converter_exe/http_download.cc
new file mode 100644
index 0000000..b037662
--- /dev/null
+++ b/src/tools/windows/converter_exe/http_download.cc
@@ -0,0 +1,326 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <assert.h>
+#include <stdio.h>
+#include <Windows.h>
+#include <WinInet.h>
+
+#include <vector>
+
+#include "tools/windows/converter_exe/http_download.h"
+#include "tools/windows/converter_exe/winhttp_client.h"
+#include "tools/windows/converter_exe/wininet_client.h"
+
+namespace crash {
+static const std::vector<char>::size_type kVectorChunkSize = 4096;  // 4 KB
+
+using std::vector;
+
+// Class that atuo closes the contained HttpHandle when the object
+// goes out of scope.
+class AutoHttpHandle {
+ public:
+  AutoHttpHandle() : handle_(NULL) {}
+  explicit AutoHttpHandle(HttpHandle handle) : handle_(handle) {}
+  ~AutoHttpHandle() {
+    if (handle_) {
+      InternetCloseHandle(handle_);
+    }
+  }
+
+  HttpHandle get() { return handle_; }
+  HttpHandle* get_handle_addr () { return &handle_; }
+
+ private:
+  HttpHandle handle_;
+};
+
+// Template class for auto releasing the contained pointer when
+// the object goes out of scope.
+template<typename T>
+class AutoPtr {
+ public:
+  explicit AutoPtr(T* ptr) : ptr_(ptr) {}
+  ~AutoPtr() {
+    if (ptr_) {
+      delete ptr_;
+    }
+  }
+
+  T* get() { return ptr_; }
+  T* operator -> () { return ptr_; }
+
+ private:
+  T* ptr_;
+};
+
+// CheckParameters ensures that the parameters in |parameters| are safe for
+// use in an HTTP URL.  Returns true if they are, false if unsafe characters
+// are present.
+static bool CheckParameters(const map<wstring, wstring> *parameters) {
+  for (map<wstring, wstring>::const_iterator iterator = parameters->begin();
+       iterator != parameters->end();
+       ++iterator) {
+    const wstring &key = iterator->first;
+    if (key.empty()) {
+      // Disallow empty parameter names.
+      return false;
+    }
+    for (unsigned int i = 0; i < key.size(); ++i) {
+      wchar_t c = key[i];
+      if (c < 32 || c == '"' || c == '?' || c == '&' || c > 127) {
+        return false;
+      }
+    }
+
+    const wstring &value = iterator->second;
+    for (unsigned int i = 0; i < value.size(); ++i) {
+      wchar_t c = value[i];
+      if (c < 32 || c == '"' || c == '?' || c == '&' || c > 127) {
+        return false;
+      }
+    }
+  }
+
+  return true;
+}
+
+HttpClient* HTTPDownload::CreateHttpClient(const wchar_t* url) {
+  const TCHAR* kHttpApiPolicyEnvironmentVariable = TEXT("USE_WINHTTP");
+  TCHAR buffer[2] = {0};
+  HttpClient* http_client = NULL;
+
+  if (::GetEnvironmentVariable(kHttpApiPolicyEnvironmentVariable,
+                               buffer,
+                               sizeof(buffer)/sizeof(buffer[0])) > 0) {
+    fprintf(stdout,
+            "Environment variable [%ws] is set, use WinHttp\n",
+            kHttpApiPolicyEnvironmentVariable);
+    http_client = CreateWinHttpClient(url);
+    if (http_client == NULL) {
+      fprintf(stderr, "WinHttpClient not created, Is the protocol HTTPS? "
+                      "Fall back to WinInet API.\n");
+    }
+  } else {
+    fprintf(stderr,
+            "Environment variable [%ws] is NOT set, use WinInet API\n",
+            kHttpApiPolicyEnvironmentVariable);
+  }
+
+  if (http_client == NULL) {
+    return CreateWinInetClient(url);
+  }
+
+  return http_client;
+}
+
+// static
+bool HTTPDownload::Download(const wstring &url,
+                            const map<wstring, wstring> *parameters,
+                            string *content, int *status_code) {
+  assert(content);
+  AutoPtr<HttpClient> http_client(CreateHttpClient(url.c_str()));
+
+  if (!http_client.get()) {
+    fprintf(stderr, "Failed to create any http client.\n");
+    return false;
+  }
+
+  if (status_code) {
+    *status_code = 0;
+  }
+
+  wchar_t scheme[16] = {0};
+  wchar_t host[256] = {0};
+  wchar_t path[256] = {0};
+  int port = 0;
+  if (!http_client->CrackUrl(url.c_str(),
+                             0,
+                             scheme,
+                             sizeof(scheme)/sizeof(scheme[0]),
+                             host,
+                             sizeof(host)/sizeof(host[0]),
+                             path,
+                             sizeof(path)/sizeof(path[0]),
+                             &port)) {
+    fprintf(stderr,
+            "HTTPDownload::Download: InternetCrackUrl: error %d for %ws\n",
+            GetLastError(), url.c_str());
+    return false;
+  }
+
+  bool secure = false;
+  if (_wcsicmp(scheme, L"https") == 0) {
+    secure = true;
+  } else if (wcscmp(scheme, L"http") != 0) {
+    fprintf(stderr,
+            "HTTPDownload::Download: scheme must be http or https for %ws\n",
+            url.c_str());
+    return false;
+  }
+
+  AutoHttpHandle internet;
+  if (!http_client->Open(NULL,  // user agent
+                         HttpClient::ACCESS_TYPE_PRECONFIG,
+                         NULL,  // proxy name
+                         NULL,  // proxy bypass
+                         internet.get_handle_addr())) {
+    fprintf(stderr,
+            "HTTPDownload::Download: Open: error %d for %ws\n",
+            GetLastError(), url.c_str());
+    return false;
+  }
+
+  AutoHttpHandle connection;
+  if (!http_client->Connect(internet.get(),
+                            host,
+                            port,
+                            connection.get_handle_addr())) {
+    fprintf(stderr,
+            "HTTPDownload::Download: InternetConnect: error %d for %ws\n",
+            GetLastError(), url.c_str());
+    return false;
+  }
+
+  wstring request_string = path;
+  if (parameters) {
+    // TODO(mmentovai): escape bad characters in parameters instead of
+    // forbidding them.
+    if (!CheckParameters(parameters)) {
+      fprintf(stderr,
+              "HTTPDownload::Download: invalid characters in parameters\n");
+      return false;
+    }
+
+    bool added_parameter = false;
+    for (map<wstring, wstring>::const_iterator iterator = parameters->begin();
+         iterator != parameters->end();
+         ++iterator) {
+      request_string.append(added_parameter ? L"&" : L"?");
+      request_string.append(iterator->first);
+      request_string.append(L"=");
+      request_string.append(iterator->second);
+      added_parameter = true;
+    }
+  }
+
+  AutoHttpHandle request;
+  if (!http_client->OpenRequest(connection.get(),
+                                L"GET",
+                                request_string.c_str(),
+                                NULL,    // version
+                                NULL,    // referer
+                                secure,
+                                request.get_handle_addr())) {
+    fprintf(stderr,
+            "HttpClient::OpenRequest: error %d for %ws, request: %ws\n",
+            GetLastError(), url.c_str(), request_string.c_str());
+    return false;
+  }
+
+  if (!http_client->SendRequest(request.get(), NULL, 0)) {
+    fprintf(stderr,
+            "HttpClient::SendRequest: error %d for %ws\n",
+            GetLastError(), url.c_str());
+    return false;
+  }
+
+  if (!http_client->ReceiveResponse(request.get())) {
+    fprintf(stderr,
+            "HttpClient::ReceiveResponse: error %d for %ws\n",
+            GetLastError(), url.c_str());
+    return false;
+  }
+
+  int http_status = 0;
+  if (!http_client->GetHttpStatusCode(request.get(), &http_status)) {
+    fprintf(stderr,
+            "HttpClient::GetHttpStatusCode: error %d for %ws\n",
+            GetLastError(), url.c_str());
+    return false;
+  }
+  if (http_status != 200) {
+    fprintf(stderr,
+            "HTTPDownload::Download: HTTP status code %d for %ws\n",
+            http_status, url.c_str());
+    return false;
+  }
+
+  DWORD content_length = 0;
+  vector<char>::size_type buffer_size = 0;
+  http_client->GetContentLength(request.get(), &content_length);
+  if (content_length == HttpClient::kUnknownContentLength) {
+    buffer_size = kVectorChunkSize;
+  } else {
+    buffer_size = content_length;
+  }
+
+  if (content_length != 0) {
+    vector<char> response_buffer = vector<char>(buffer_size+1);
+    DWORD size_read;
+    DWORD total_read = 0;
+    bool read_result;
+    do {
+      if (content_length == HttpClient::kUnknownContentLength
+          && buffer_size == total_read) {
+        // The content length wasn't specified in the response header, so we
+        // have to keep growing the buffer until we're done reading.
+        buffer_size += kVectorChunkSize;
+        response_buffer.resize(buffer_size);
+      }
+      read_result = !!http_client->ReadData(
+          request.get(),
+          &response_buffer[total_read],
+          static_cast<DWORD>(buffer_size) - total_read,
+          &size_read);
+      total_read += size_read;
+    } while (read_result && (size_read != 0));
+
+    if (!read_result) {
+      fprintf(stderr,
+              "HttpClient::ReadData: error %d for %ws\n",
+              GetLastError(),
+              url.c_str());
+      return false;
+    } else if (size_read != 0) {
+      fprintf(stderr,
+              "HttpClient::ReadData: error %d/%d for %ws\n",
+              total_read,
+              content_length,
+              url.c_str());
+      return false;
+    }
+    content->assign(&response_buffer[0], total_read);
+  } else {
+    content->clear();
+  }
+  return true;
+}
+
+}  // namespace crash
diff --git a/src/tools/windows/converter_exe/http_download.h b/src/tools/windows/converter_exe/http_download.h
new file mode 100644
index 0000000..2d705d5
--- /dev/null
+++ b/src/tools/windows/converter_exe/http_download.h
@@ -0,0 +1,62 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef TOOLS_WINDOWS_CONVERTER_EXE_HTTP_DOWNLOAD_H_
+#define TOOLS_WINDOWS_CONVERTER_EXE_HTTP_DOWNLOAD_H_
+
+#include <map>
+#include <string>
+#include "tools/windows/converter_exe/winhttp_client.h"
+
+namespace crash {
+
+using std::map;
+using std::string;
+using std::wstring;
+
+class HTTPDownload {
+ public:
+  // Retrieves the resource located at |url|, a http or https URL, via WinInet.
+  // The request is fetched with GET request; the optional |parameters| are
+  // appended to the URL.  Returns true on success, placing the content of the
+  // retrieved resource in |content|.  Returns false on failure.  HTTP status
+  // codes other than 200 cause Download to return false.  If |status_code| is
+  // supplied, it will be set to the value of the HTTP status code, if an HTTP
+  // transaction occurs.  If Download fails before a transaction can occur,
+  // |status_code| will be set to 0.  Any failures will result in messages
+  // being printed to stderr.
+  static bool Download(const wstring &url,
+                       const map<wstring, wstring> *parameters,
+                       string *content, int *status_code);
+ private:
+  static HttpClient* CreateHttpClient(const wchar_t*);
+};
+
+}  // namespace crash
+
+#endif  // TOOLS_WINDOWS_CONVERTER_EXE_HTTP_DOWNLOAD_H_
diff --git a/src/tools/windows/converter_exe/missing_symbols_test.txt b/src/tools/windows/converter_exe/missing_symbols_test.txt
new file mode 100644
index 0000000..251b4ec
--- /dev/null
+++ b/src/tools/windows/converter_exe/missing_symbols_test.txt
@@ -0,0 +1,2 @@
+msctf.pdb|6A5BABB8E88644C696530BFE3C90F32F2|6.1.7600.16385|msctf.dll|4A5BDFAA109000
+imm32.pdb|98F27BA5AEE541ECBEE00CD03AD50FEE2|6.1.7600.16385|imm32.dll|4A5BDF402e000
diff --git a/src/tools/windows/converter_exe/symsrv.yes b/src/tools/windows/converter_exe/symsrv.yes
new file mode 100644
index 0000000..1d01dda
--- /dev/null
+++ b/src/tools/windows/converter_exe/symsrv.yes
@@ -0,0 +1,2 @@
+See breakpad/tools/windows/converter/ms_symbol_server_converter.h for a
+description of this file's function.
diff --git a/src/tools/windows/converter_exe/tokenizer.cc b/src/tools/windows/converter_exe/tokenizer.cc
new file mode 100644
index 0000000..992694c
--- /dev/null
+++ b/src/tools/windows/converter_exe/tokenizer.cc
@@ -0,0 +1,61 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <assert.h>
+
+#include "tools/windows/converter_exe/tokenizer.h"
+
+namespace crash {
+
+// static
+void Tokenizer::Tokenize(const string &delimiters, const string &input,
+                        vector<string> *output) {
+  assert(output);
+  output->clear();
+
+  string::size_type position = 0;  // Where to begin looking for a delimiter
+  string::size_type new_position;  // Position of found delimiter
+  string token;
+
+  while ((new_position = input.find_first_of(delimiters, position)) !=
+         string::npos) {
+    token = input.substr(position, new_position - position);
+    output->push_back(token);
+
+    // Next time, begin looking right after this delimiter.
+    position = new_position + 1;
+  }
+
+  // There are no more delimiters in the string.  Take everything from the
+  // final delimiter up to the end of the string as a token.  This may be
+  // an empty string.
+  token = input.substr(position);
+  output->push_back(token);
+}
+
+}  // namespace crash
diff --git a/src/tools/windows/converter_exe/tokenizer.h b/src/tools/windows/converter_exe/tokenizer.h
new file mode 100644
index 0000000..f4bbcfd
--- /dev/null
+++ b/src/tools/windows/converter_exe/tokenizer.h
@@ -0,0 +1,51 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef TOOLS_WINDOWS_CONVERTER_EXE_TOKENIZER_H_
+#define TOOLS_WINDOWS_CONVERTER_EXE_TOKENIZER_H_
+
+#include <string>
+#include <vector>
+
+namespace crash {
+
+using std::string;
+using std::vector;
+
+class Tokenizer {
+ public:
+  // Splits |input| into a series of tokens delimited in the input string by
+  // any of the characters in |delimiters|.  The tokens are passed back in the
+  // |output| vector.
+  static void Tokenize(const string &delimiters, const string &input,
+                       vector<string> *output);
+};
+
+}  // namespace crash
+
+#endif  // TOOLS_WINDOWS_CONVERTER_EXE_TOKENIZER_H_
diff --git a/src/tools/windows/converter_exe/winhttp_client.cc b/src/tools/windows/converter_exe/winhttp_client.cc
new file mode 100644
index 0000000..8a8ade3
--- /dev/null
+++ b/src/tools/windows/converter_exe/winhttp_client.cc
@@ -0,0 +1,307 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "tools/windows/converter_exe/winhttp_client.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <windows.h>
+#include <winhttp.h>
+#include <vector>
+
+namespace crash {
+
+namespace internal {
+
+// This class implements HttpClient based on WinInet APIs.
+class WinHttpClient : public HttpClient {
+ public:
+  virtual ~WinHttpClient() {}
+  virtual bool CrackUrl(const TCHAR* url,
+                        DWORD flags,
+                        TCHAR* scheme,
+                        size_t scheme_buffer_length,
+                        TCHAR* host,
+                        size_t host_buffer_length,
+                        TCHAR* uri,
+                        size_t uri_buffer_length,
+                        int* port) const;
+  virtual bool Open(const TCHAR* user_agent,
+                    DWORD access_type,
+                    const TCHAR* proxy_name,
+                    const TCHAR* proxy_bypass,
+                    HttpHandle* session_handle) const;
+  virtual bool Connect(HttpHandle session_handle,
+                       const TCHAR* server,
+                       int port,
+                       HttpHandle* connection_handle) const;
+  virtual bool OpenRequest(HttpHandle connection_handle,
+                           const TCHAR* verb,
+                           const TCHAR* uri,
+                           const TCHAR* version,
+                           const TCHAR* referrer,
+                           bool is_secure,
+                           HttpHandle* request_handle) const;
+  virtual bool SendRequest(HttpHandle request_handle,
+                           const TCHAR* headers,
+                           DWORD headers_length) const;
+  virtual bool ReceiveResponse(HttpHandle request_handle) const;
+  virtual bool GetHttpStatusCode(HttpHandle request_handle,
+                                 int* status_code) const;
+  virtual bool GetContentLength(HttpHandle request_handle,
+                                DWORD* content_length) const;
+  virtual bool ReadData(HttpHandle request_handle,
+                        void* buffer,
+                        DWORD buffer_length,
+                        DWORD* bytes_read) const;
+  virtual bool Close(HttpHandle handle) const;
+
+ private:
+  static DWORD MapAccessType(DWORD access_type);
+  static HINTERNET ToHINTERNET(HttpHandle handle);
+  static HttpHandle FromHINTERNET(HINTERNET handle);
+};
+
+bool WinHttpClient::CrackUrl(const TCHAR* url,
+                             DWORD flags,
+                             TCHAR* scheme,
+                             size_t scheme_buffer_length,
+                             TCHAR* host,
+                             size_t host_buffer_length,
+                             TCHAR* uri,
+                             size_t uri_buffer_length,
+                             int* port) const {
+  assert(url);
+  assert(scheme);
+  assert(host);
+  assert(uri);
+  assert(port);
+
+  URL_COMPONENTS url_comp = {0};
+  url_comp.dwStructSize = sizeof(url_comp);
+  url_comp.lpszScheme = scheme;
+  url_comp.dwSchemeLength = static_cast<DWORD>(scheme_buffer_length);
+  url_comp.lpszHostName = host;
+  url_comp.dwHostNameLength = static_cast<DWORD>(host_buffer_length);
+  url_comp.lpszUrlPath = uri;
+  url_comp.dwUrlPathLength = static_cast<DWORD>(uri_buffer_length);
+
+  bool result = !!::WinHttpCrackUrl(url, 0, flags, &url_comp);
+  if (result) {
+    *port = static_cast<int>(url_comp.nPort);
+  }
+  return result;
+}
+
+bool WinHttpClient::Open(const TCHAR* user_agent,
+                         DWORD access_type,
+                         const TCHAR* proxy_name,
+                         const TCHAR* proxy_bypass,
+                         HttpHandle* session_handle)  const {
+  *session_handle = FromHINTERNET(::WinHttpOpen(user_agent,
+                                                MapAccessType(access_type),
+                                                proxy_name,
+                                                proxy_bypass,
+                                                0));
+
+  return !!(*session_handle);
+}
+
+bool WinHttpClient::Connect(HttpHandle session_handle,
+                            const TCHAR* server,
+                            int port,
+                            HttpHandle* connection_handle) const {
+  assert(server);
+
+  // Uses NULL user name and password to connect.
+  *connection_handle = FromHINTERNET(::WinHttpConnect(
+                                         ToHINTERNET(session_handle),
+                                         server,
+                                         static_cast<INTERNET_PORT>(port),
+                                         NULL));
+  return !!(*connection_handle);
+}
+
+bool WinHttpClient::OpenRequest(HttpHandle connection_handle,
+                                const TCHAR* verb,
+                                const TCHAR* uri,
+                                const TCHAR* version,
+                                const TCHAR* referrer,
+                                bool is_secure,
+                                HttpHandle* request_handle) const {
+  assert(connection_handle);
+  assert(verb);
+  assert(uri);
+  assert(request_handle);
+
+  *request_handle = FromHINTERNET(::WinHttpOpenRequest(
+                                      ToHINTERNET(connection_handle),
+                                      verb,
+                                      uri,
+                                      version,
+                                      referrer,
+                                      WINHTTP_DEFAULT_ACCEPT_TYPES,
+                                      is_secure ? WINHTTP_FLAG_SECURE : 0));
+  return !!(*request_handle);
+}
+
+bool WinHttpClient::SendRequest(HttpHandle request_handle,
+                                const TCHAR* headers,
+                                DWORD headers_length) const {
+  assert(request_handle);
+
+  return !!::WinHttpSendRequest(ToHINTERNET(request_handle),
+                                headers,
+                                headers_length,
+                                NULL,
+                                0,
+                                WINHTTP_IGNORE_REQUEST_TOTAL_LENGTH,
+                                NULL);
+}
+
+bool WinHttpClient::ReceiveResponse(HttpHandle request_handle) const {
+  assert(request_handle);
+
+  return !!::WinHttpReceiveResponse(ToHINTERNET(request_handle), NULL);
+}
+
+bool WinHttpClient::GetHttpStatusCode(HttpHandle request_handle,
+                                      int* status_code) const {
+  TCHAR http_status_string[4] = {0};
+  DWORD http_status_string_size = sizeof(http_status_string);
+  if (!::WinHttpQueryHeaders(ToHINTERNET(request_handle),
+                             WINHTTP_QUERY_STATUS_CODE,
+                             WINHTTP_HEADER_NAME_BY_INDEX,
+                             static_cast<void *>(&http_status_string),
+                             &http_status_string_size, 0)) {
+    return false;
+  }
+
+  *status_code = static_cast<DWORD>(_tcstol(http_status_string, NULL, 10));
+  return true;
+}
+
+bool WinHttpClient::GetContentLength(HttpHandle request_handle,
+                                     DWORD* content_length) const {
+  assert(request_handle);
+  assert(content_length);
+
+  TCHAR content_length_string[11] = {0};
+  DWORD content_length_string_size = sizeof(content_length_string);
+  if (!::WinHttpQueryHeaders(ToHINTERNET(request_handle),
+                             WINHTTP_QUERY_CONTENT_LENGTH,
+                             WINHTTP_HEADER_NAME_BY_INDEX,
+                             static_cast<void *>(&content_length_string),
+                             &content_length_string_size, 0)) {
+    *content_length = kUnknownContentLength;
+  } else {
+    *content_length =
+        static_cast<DWORD>(wcstol(content_length_string, NULL, 10));
+  }
+  return true;
+}
+
+bool WinHttpClient::ReadData(HttpHandle request_handle,
+                             void* buffer,
+                             DWORD buffer_length,
+                             DWORD* bytes_read) const {
+  assert(request_handle);
+  assert(buffer);
+  assert(bytes_read);
+
+  DWORD bytes_read_local = 0;
+  if (!::WinHttpReadData(ToHINTERNET(request_handle),
+                         buffer,
+                         buffer_length,
+                         &bytes_read_local)) {
+    return false;
+  }
+  *bytes_read = bytes_read_local;
+  return true;
+}
+
+bool WinHttpClient::Close(HttpHandle handle) const {
+  assert(handle);
+  return !!::WinHttpCloseHandle(ToHINTERNET(handle));
+}
+
+DWORD WinHttpClient::MapAccessType(DWORD access_type) {
+  switch (static_cast<AccessType>(access_type)) {
+    case ACCESS_TYPE_PRECONFIG:
+    default:
+      return WINHTTP_ACCESS_TYPE_DEFAULT_PROXY;
+    case ACCESS_TYPE_DIRECT:
+      return WINHTTP_ACCESS_TYPE_NO_PROXY;
+    case ACCESS_TYPE_PROXY:
+      return WINHTTP_ACCESS_TYPE_NAMED_PROXY;
+  }
+}
+
+
+HINTERNET WinHttpClient::ToHINTERNET(HttpHandle handle) {
+  return static_cast<HINTERNET>(handle);
+}
+
+HttpHandle WinHttpClient::FromHINTERNET(HINTERNET handle) {
+  return static_cast<HttpHandle>(handle);
+}
+
+}  // namespace internal
+
+HttpClient* CreateWinHttpClient(const TCHAR* url) {
+  assert(url);
+
+  internal::WinHttpClient winhttp;
+  wchar_t scheme[16] = {0};
+  wchar_t host[256] = {0};
+  wchar_t path[256] = {0};
+  int port = 0;
+
+  if (!winhttp.CrackUrl(url,
+                        0,
+                        scheme,
+                        sizeof(scheme)/sizeof(scheme[0]),
+                        host,
+                        sizeof(host)/sizeof(host[0]),
+                        path,
+                        sizeof(path)/sizeof(path[0]),
+                        &port)) {
+    return NULL;
+  }
+
+  if (_wcsicmp(scheme, L"https") == 0) {
+    // Winhttp under WINE doesn't support wildcard certificates, so avoid 
+    // to use it if the scheme is https. The caller should fall back to
+    // use wininet if NULL is returned.
+    return NULL;
+  }
+
+  return new internal::WinHttpClient();
+}
+
+}  // namespace crash
diff --git a/src/tools/windows/converter_exe/winhttp_client.h b/src/tools/windows/converter_exe/winhttp_client.h
new file mode 100644
index 0000000..819d610
--- /dev/null
+++ b/src/tools/windows/converter_exe/winhttp_client.h
@@ -0,0 +1,40 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef TOOLS_WINDOWS_CONVERTER_EXE_WINHTTP_CLIENT_H_
+#define TOOLS_WINDOWS_CONVERTER_EXE_WINHTTP_CLIENT_H_
+
+#include "tools/windows/converter_exe/http_client.h"
+
+namespace crash {
+
+HttpClient* CreateWinHttpClient(const TCHAR* url);
+
+}  // namespace crash
+
+#endif  // TOOLS_WINDOWS_CONVERTER_EXE_WINHTTP_CLIENT_H_
diff --git a/src/tools/windows/converter_exe/wininet_client.cc b/src/tools/windows/converter_exe/wininet_client.cc
new file mode 100644
index 0000000..3e542db
--- /dev/null
+++ b/src/tools/windows/converter_exe/wininet_client.cc
@@ -0,0 +1,278 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "tools/windows/converter_exe/wininet_client.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <windows.h>
+#include <wininet.h>
+
+namespace crash {
+
+namespace internal {
+
+// This class implements HttpClient based on WinInet APIs.
+class WinInetClient : public HttpClient {
+ public:
+  virtual ~WinInetClient() {}
+  virtual bool CrackUrl(const TCHAR* url,
+                        DWORD flags,
+                        TCHAR* scheme,
+                        size_t scheme_buffer_length,
+                        TCHAR* host,
+                        size_t host_buffer_length,
+                        TCHAR* uri,
+                        size_t uri_buffer_length,
+                        int* port) const;
+  virtual bool Open(const TCHAR* user_agent,
+                    DWORD access_type,
+                    const TCHAR* proxy_name,
+                    const TCHAR* proxy_bypass,
+                    HttpHandle* session_handle) const;
+  virtual bool Connect(HttpHandle session_handle,
+                       const TCHAR* server,
+                       int port,
+                       HttpHandle* connection_handle) const;
+  virtual bool OpenRequest(HttpHandle connection_handle,
+                           const TCHAR* verb,
+                           const TCHAR* uri,
+                           const TCHAR* version,
+                           const TCHAR* referrer,
+                           bool is_secure,
+                           HttpHandle* request_handle) const;
+  virtual bool SendRequest(HttpHandle request_handle,
+                           const TCHAR* headers,
+                           DWORD headers_length) const;
+  virtual bool ReceiveResponse(HttpHandle request_handle) const;
+  virtual bool GetHttpStatusCode(HttpHandle request_handle,
+                                 int* status_code) const;
+  virtual bool GetContentLength(HttpHandle request_handle,
+                                DWORD* content_length) const;
+  virtual bool ReadData(HttpHandle request_handle,
+                        void* buffer,
+                        DWORD buffer_length,
+                        DWORD* bytes_read) const;
+  virtual bool Close(HttpHandle handle) const;
+
+ private:
+  static DWORD MapAccessType(DWORD access_type);
+  static HINTERNET ToHINTERNET(HttpHandle handle);
+  static HttpHandle FromHINTERNET(HINTERNET handle);
+};
+
+bool WinInetClient::CrackUrl(const TCHAR* url,
+                             DWORD flags,
+                             TCHAR* scheme,
+                             size_t scheme_buffer_length,
+                             TCHAR* host,
+                             size_t host_buffer_length,
+                             TCHAR* uri,
+                             size_t uri_buffer_length,
+                             int* port) const {
+  assert(url);
+  assert(scheme);
+  assert(host);
+  assert(uri);
+  assert(port);
+
+  URL_COMPONENTS url_comp = {0};
+  url_comp.dwStructSize = sizeof(url_comp);
+  url_comp.lpszScheme = scheme;
+  url_comp.dwSchemeLength = static_cast<DWORD>(scheme_buffer_length);
+  url_comp.lpszHostName = host;
+  url_comp.dwHostNameLength = static_cast<DWORD>(host_buffer_length);
+  url_comp.lpszUrlPath = uri;
+  url_comp.dwUrlPathLength = static_cast<DWORD>(uri_buffer_length);
+
+  bool result = !!::InternetCrackUrl(url, 0, flags, &url_comp);
+  if (result) {
+    *port = static_cast<int>(url_comp.nPort);
+  }
+  return result;
+}
+
+bool WinInetClient::Open(const TCHAR* user_agent,
+                         DWORD access_type,
+                         const TCHAR* proxy_name,
+                         const TCHAR* proxy_bypass,
+                         HttpHandle* session_handle)  const {
+  *session_handle = FromHINTERNET(::InternetOpen(user_agent,
+                                                 MapAccessType(access_type),
+                                                 proxy_name,
+                                                 proxy_bypass,
+                                                 0));
+  return !!(*session_handle);
+}
+
+bool WinInetClient::Connect(HttpHandle session_handle,
+                            const TCHAR* server,
+                            int port,
+                            HttpHandle* connection_handle) const {
+  assert(server);
+
+  // Uses NULL user name and password to connect. Always uses http service.
+  *connection_handle = FromHINTERNET(::InternetConnect(
+                                         ToHINTERNET(session_handle),
+                                         server,
+                                         static_cast<INTERNET_PORT>(port),
+                                         NULL,
+                                         NULL,
+                                         INTERNET_SERVICE_HTTP,
+                                         0,
+                                         0));
+  return !!(*connection_handle);
+}
+
+bool WinInetClient::OpenRequest(HttpHandle connection_handle,
+                                const TCHAR* verb,
+                                const TCHAR* uri,
+                                const TCHAR* version,
+                                const TCHAR* referrer,
+                                bool is_secure,
+                                HttpHandle* request_handle) const {
+  assert(connection_handle);
+  assert(verb);
+  assert(uri);
+
+  *request_handle = FromHINTERNET(::HttpOpenRequest(
+                                      ToHINTERNET(connection_handle),
+                                      verb,
+                                      uri,
+                                      version,
+                                      referrer,
+                                      NULL,
+                                      is_secure ? INTERNET_FLAG_SECURE : 0,
+                                      NULL));
+  return !!(*request_handle);
+}
+
+bool WinInetClient::SendRequest(HttpHandle request_handle,
+                                const TCHAR* headers,
+                                DWORD headers_length) const {
+  assert(request_handle);
+
+  return !!::HttpSendRequest(ToHINTERNET(request_handle),
+                             headers,
+                             headers_length,
+                             NULL,
+                             0);
+}
+
+bool WinInetClient::ReceiveResponse(HttpHandle) const {
+  return true;
+}
+
+bool WinInetClient::GetHttpStatusCode(HttpHandle request_handle,
+                                      int* status_code) const {
+  assert(request_handle);
+
+  TCHAR http_status_string[4] = {0};
+  DWORD http_status_string_size = sizeof(http_status_string);
+  if (!::HttpQueryInfo(ToHINTERNET(request_handle),
+                       HTTP_QUERY_STATUS_CODE,
+                       static_cast<void *>(&http_status_string),
+                       &http_status_string_size,
+                       0)) {
+    return false;
+  }
+
+  *status_code = _tcstol(http_status_string, NULL, 10);
+  return true;
+}
+
+bool WinInetClient::GetContentLength(HttpHandle request_handle,
+                                     DWORD* content_length) const {
+  assert(request_handle);
+  assert(content_length);
+
+  TCHAR content_length_string[11];
+  DWORD content_length_string_size = sizeof(content_length_string);
+  if (!::HttpQueryInfo(ToHINTERNET(request_handle),
+                       HTTP_QUERY_CONTENT_LENGTH,
+                       static_cast<void *>(&content_length_string),
+                       &content_length_string_size,
+                       0)) {
+    *content_length = kUnknownContentLength;
+  } else {
+    *content_length = wcstol(content_length_string, NULL, 10);
+  }
+  return true;
+}
+
+bool WinInetClient::ReadData(HttpHandle request_handle,
+                             void* buffer,
+                             DWORD buffer_length,
+                             DWORD* bytes_read) const {
+  assert(request_handle);
+  assert(buffer);
+  assert(bytes_read);
+
+  DWORD bytes_read_local = 0;
+  if (!::InternetReadFile(ToHINTERNET(request_handle),
+                          buffer,
+                          buffer_length,
+                          &bytes_read_local)) {
+    return false;
+  }
+  *bytes_read = bytes_read_local;
+  return true;
+}
+
+bool WinInetClient::Close(HttpHandle handle) const {
+  assert(handle);
+  return !!::InternetCloseHandle(ToHINTERNET(handle));
+}
+
+DWORD WinInetClient::MapAccessType(DWORD access_type) {
+  switch (static_cast<AccessType>(access_type)) {
+    case ACCESS_TYPE_PRECONFIG:
+    default:
+      return INTERNET_OPEN_TYPE_PRECONFIG;
+    case ACCESS_TYPE_DIRECT:
+      return INTERNET_OPEN_TYPE_DIRECT;
+    case ACCESS_TYPE_PROXY:
+      return INTERNET_OPEN_TYPE_PROXY;
+  }
+}
+
+HINTERNET WinInetClient::ToHINTERNET(HttpHandle handle) {
+  return static_cast<HINTERNET>(handle);
+}
+
+HttpHandle WinInetClient::FromHINTERNET(HINTERNET handle) {
+  return static_cast<HttpHandle>(handle);
+}
+
+}  // namespace internal
+
+HttpClient* CreateWinInetClient(const TCHAR*) {
+  return new internal::WinInetClient();
+}
+
+}  // namespace crash
diff --git a/src/tools/windows/converter_exe/wininet_client.h b/src/tools/windows/converter_exe/wininet_client.h
new file mode 100644
index 0000000..bd04b60
--- /dev/null
+++ b/src/tools/windows/converter_exe/wininet_client.h
@@ -0,0 +1,40 @@
+// Copyright 2019 Google Inc. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef TOOLS_WINDOWS_CONVERTER_EXE_WININET_CLIENT_H_
+#define TOOLS_WINDOWS_CONVERTER_EXE_WININET_CLIENT_H_
+
+#include "tools/windows/converter_exe/http_client.h"
+
+namespace crash {
+
+HttpClient* CreateWinInetClient(const TCHAR* url);
+
+}  // namespace crash
+
+#endif  // TOOLS_WINDOWS_CONVERTER_EXE_WININET_CLIENT_H_
diff --git a/src/tools/windows/tools_windows.gyp b/src/tools/windows/tools_windows.gyp
index cc0da72..17b88b4 100644
--- a/src/tools/windows/tools_windows.gyp
+++ b/src/tools/windows/tools_windows.gyp
@@ -37,6 +37,7 @@
       'type': 'none',
       'dependencies': [
         './converter/ms_symbol_server_converter.gyp:*',
+        './converter_exe/converter.gyp:*',
         './dump_syms/dump_syms.gyp:*',
         './symupload/symupload.gyp:*',
       ],