src/common/windows/http_upload.cc - breakpad - Git at Google

 // Copyright (c) 2006, 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>

 // Disable exception handler warnings.
 #pragma warning(disable:4530)

 #include <fstream>

 #include "common/windows/string_utils-inl.h"

 #include "common/windows/http_upload.h"

 namespace google_breakpad {

 using std::ifstream;
 using std::ios;

 static const wchar_t kUserAgent[] = L"Breakpad/1.0 (Windows)";

 // Helper class which closes an internet handle when it goes away
 class HTTPUpload::AutoInternetHandle {
  public:
   explicit AutoInternetHandle(HINTERNET handle) : handle_(handle) {}
   ~AutoInternetHandle() {
     if (handle_) {
       InternetCloseHandle(handle_);
     }
   }

   HINTERNET get() { return handle_; }

  private:
   HINTERNET handle_;
 };

 // static
 bool HTTPUpload::SendRequest(const wstring &url,
                              const map<wstring, wstring> &parameters,
                              const map<wstring, wstring> &files,
                              int *timeout,
                              wstring *response_body,
                              int *response_code) {
   if (response_code) {
     *response_code = 0;
   }

   // TODO(bryner): support non-ASCII parameter names
   if (!CheckParameters(parameters)) {
     return false;
   }

   // Break up the URL and make sure we can handle it
   wchar_t scheme[16], host[256], path[256];
   URL_COMPONENTS components;
   memset(&components, 0, sizeof(components));
   components.dwStructSize = sizeof(components);
   components.lpszScheme = scheme;
   components.dwSchemeLength = sizeof(scheme) / sizeof(scheme[0]);
   components.lpszHostName = host;
   components.dwHostNameLength = sizeof(host) / sizeof(host[0]);
   components.lpszUrlPath = path;
   components.dwUrlPathLength = sizeof(path) / sizeof(path[0]);
   if (!InternetCrackUrl(url.c_str(), static_cast<DWORD>(url.size()),
                         0, &components)) {
     return false;
   }
   bool secure = false;
   if (wcscmp(scheme, L"https") == 0) {
     secure = true;
   } else if (wcscmp(scheme, L"http") != 0) {
     return false;
   }

   AutoInternetHandle internet(InternetOpen(kUserAgent,
                                            INTERNET_OPEN_TYPE_PRECONFIG,
                                            NULL,  // proxy name
                                            NULL,  // proxy bypass
                                            0));   // flags
   if (!internet.get()) {
     return false;
   }

   AutoInternetHandle connection(InternetConnect(internet.get(),
                                                 host,
                                                 components.nPort,
                                                 NULL,    // user name
                                                 NULL,    // password
                                                 INTERNET_SERVICE_HTTP,
                                                 0,       // flags
                                                 NULL));  // context
   if (!connection.get()) {
     return false;
   }

   DWORD http_open_flags = secure ? INTERNET_FLAG_SECURE : 0;
   http_open_flags |= INTERNET_FLAG_NO_COOKIES;
   AutoInternetHandle request(HttpOpenRequest(connection.get(),
                                              L"POST",
                                              path,
                                              NULL,    // version
                                              NULL,    // referer
                                              NULL,    // agent type
                                              http_open_flags,
                                              NULL));  // context
   if (!request.get()) {
     return false;
   }

   wstring boundary = GenerateMultipartBoundary();
   wstring content_type_header = GenerateRequestHeader(boundary);
   HttpAddRequestHeaders(request.get(),
                         content_type_header.c_str(),
                         static_cast<DWORD>(-1),
                         HTTP_ADDREQ_FLAG_ADD);

   string request_body;
   if (!GenerateRequestBody(parameters, files, boundary, &request_body)) {
     return false;
   }

   if (timeout) {
     if (!InternetSetOption(request.get(),
                            INTERNET_OPTION_SEND_TIMEOUT,
                            timeout,
                            sizeof(*timeout))) {
       fwprintf(stderr, L"Could not unset send timeout, continuing...\n");
     }

     if (!InternetSetOption(request.get(),
                            INTERNET_OPTION_RECEIVE_TIMEOUT,
                            timeout,
                            sizeof(*timeout))) {
       fwprintf(stderr, L"Could not unset receive timeout, continuing...\n");
     }
   }

   if (!HttpSendRequest(request.get(), NULL, 0,
                        const_cast<char *>(request_body.data()),
                        static_cast<DWORD>(request_body.size()))) {
     return false;
   }

   // The server indicates a successful upload with HTTP status 200.
   wchar_t http_status[4];
   DWORD http_status_size = sizeof(http_status);
   if (!HttpQueryInfo(request.get(), HTTP_QUERY_STATUS_CODE,
                      static_cast<LPVOID>(&http_status), &http_status_size,
                      0)) {
     return false;
   }

   int http_response = wcstol(http_status, NULL, 10);
   if (response_code) {
     *response_code = http_response;
   }

   bool result = (http_response == 200);

   if (result) {
     result = ReadResponse(request.get(), response_body);
   }

   return result;
 }

 // static
 bool HTTPUpload::ReadResponse(HINTERNET request, wstring *response) {
   bool has_content_length_header = false;
   wchar_t content_length[32];
   DWORD content_length_size = sizeof(content_length);
   DWORD claimed_size = 0;
   string response_body;

   if (HttpQueryInfo(request, HTTP_QUERY_CONTENT_LENGTH,
                     static_cast<LPVOID>(&content_length),
                     &content_length_size, 0)) {
     has_content_length_header = true;
     claimed_size = wcstol(content_length, NULL, 10);
     response_body.reserve(claimed_size);
   }


   DWORD bytes_available;
   DWORD total_read = 0;
   BOOL return_code;

   while (((return_code = InternetQueryDataAvailable(request, &bytes_available,
       0, 0)) != 0) && bytes_available > 0) {
     vector<char> response_buffer(bytes_available);
     DWORD size_read;

     return_code = InternetReadFile(request,
                                    &response_buffer[0],
                                    bytes_available, &size_read);

     if (return_code && size_read > 0) {
       total_read += size_read;
       response_body.append(&response_buffer[0], size_read);
     } else {
       break;
     }
   }

   bool succeeded = return_code && (!has_content_length_header ||
                                    (total_read == claimed_size));
   if (succeeded && response) {
     *response = UTF8ToWide(response_body);
   }

   return succeeded;
 }

 // static
 wstring HTTPUpload::GenerateMultipartBoundary() {
   // The boundary has 27 '-' characters followed by 16 hex digits
   static const wchar_t kBoundaryPrefix[] = L"---------------------------";
   static const int kBoundaryLength = 27 + 16 + 1;

   // Generate some random numbers to fill out the boundary
   int r0 = rand();
   int r1 = rand();

   wchar_t temp[kBoundaryLength];
   swprintf(temp, kBoundaryLength, L"%s%08X%08X", kBoundaryPrefix, r0, r1);

   // remove when VC++7.1 is no longer supported
   temp[kBoundaryLength - 1] = L'\0';

   return wstring(temp);
 }

 // static
 wstring HTTPUpload::GenerateRequestHeader(const wstring &boundary) {
   wstring header = L"Content-Type: multipart/form-data; boundary=";
   header += boundary;
   return header;
 }

 // static
 bool HTTPUpload::GenerateRequestBody(const map<wstring, wstring> &parameters,
                                      const map<wstring, wstring> &files,
                                      const wstring &boundary,
                                      string *request_body) {
   string boundary_str = WideToUTF8(boundary);
   if (boundary_str.empty()) {
     return false;
   }

   request_body->clear();

   // Append each of the parameter pairs as a form-data part
   for (map<wstring, wstring>::const_iterator pos = parameters.begin();
        pos != parameters.end(); ++pos) {
     request_body->append("--" + boundary_str + "\r\n");
     request_body->append("Content-Disposition: form-data; name=\"" +
                          WideToUTF8(pos->first) + "\"\r\n\r\n" +
                          WideToUTF8(pos->second) + "\r\n");
   }

   for (map<wstring, wstring>::const_iterator pos = files.begin();
        pos != files.end(); ++pos) {
     vector<char> contents;
     if (!GetFileContents(pos->second, &contents)) {
       return false;
     }

     // Now append the upload files as a binary (octet-stream) part
     string filename_utf8 = WideToUTF8(pos->second);
     if (filename_utf8.empty()) {
       return false;
     }

     string file_part_name_utf8 = WideToUTF8(pos->first);
     if (file_part_name_utf8.empty()) {
       return false;
     }

     request_body->append("--" + boundary_str + "\r\n");
     request_body->append("Content-Disposition: form-data; "
       "name=\"" + file_part_name_utf8 + "\"; "
       "filename=\"" + filename_utf8 + "\"\r\n");
     request_body->append("Content-Type: application/octet-stream\r\n");
     request_body->append("\r\n");

     if (!contents.empty()) {
       request_body->append(&(contents[0]), contents.size());
     }
     request_body->append("\r\n");
   }
   request_body->append("--" + boundary_str + "--\r\n");
   return true;
 }

 // static
 bool HTTPUpload::GetFileContents(const wstring &filename,
                                  vector<char> *contents) {
   bool rv = false;
   // The "open" method on pre-MSVC8 ifstream implementations doesn't accept a
   // wchar_t* filename, so use _wfopen directly in that case.  For VC8 and
   // later, _wfopen has been deprecated in favor of _wfopen_s, which does
   // not exist in earlier versions, so let the ifstream open the file itself.
   // GCC doesn't support wide file name and opening on FILE* requires ugly
   // hacks, so fallback to multi byte file.
 #ifdef _MSC_VER
   ifstream file;
   file.open(filename.c_str(), ios::binary);
 #else // GCC
   ifstream file(WideToMBCP(filename, CP_ACP).c_str(), ios::binary);
 #endif  // _MSC_VER >= 1400
   if (file.is_open()) {
     file.seekg(0, ios::end);
     std::streamoff length = file.tellg();
     // Check for loss of data when converting lenght from std::streamoff into
     // std::vector<char>::size_type
     std::vector<char>::size_type vector_size =
         static_cast<std::vector<char>::size_type>(length);
     if (static_cast<std::streamoff>(vector_size) == length) {
       contents->resize(vector_size);
       if (length != 0) {
         file.seekg(0, ios::beg);
         file.read(&((*contents)[0]), length);
       }
       rv = true;
     }
     file.close();
   }
   return rv;
 }

 // static
 wstring HTTPUpload::UTF8ToWide(const string &utf8) {
   if (utf8.length() == 0) {
     return wstring();
   }

   // compute the length of the buffer we'll need
   int charcount = MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, NULL, 0);

   if (charcount == 0) {
     return wstring();
   }

   // convert
   wchar_t* buf = new wchar_t[charcount];
   MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, buf, charcount);
   wstring result(buf);
   delete[] buf;
   return result;
 }

 // static
 string HTTPUpload::WideToMBCP(const wstring &wide, unsigned int cp) {
   if (wide.length() == 0) {
     return string();
   }

   // compute the length of the buffer we'll need
   int charcount = WideCharToMultiByte(cp, 0, wide.c_str(), -1,
                                       NULL, 0, NULL, NULL);
   if (charcount == 0) {
     return string();
   }

   // convert
   char *buf = new char[charcount];
   WideCharToMultiByte(cp, 0, wide.c_str(), -1, buf, charcount,
                       NULL, NULL);

   string result(buf);
   delete[] buf;
   return result;
 }

 // static
 bool HTTPUpload::CheckParameters(const map<wstring, wstring> &parameters) {
   for (map<wstring, wstring>::const_iterator pos = parameters.begin();
        pos != parameters.end(); ++pos) {
     const wstring &str = pos->first;
     if (str.size() == 0) {
       return false;  // disallow empty parameter names
     }
     for (unsigned int i = 0; i < str.size(); ++i) {
       wchar_t c = str[i];
       if (c < 32 || c == '"' || c > 127) {
         return false;
       }
     }
   }
   return true;
 }

 }  // namespace google_breakpad
	// Copyright (c) 2006, 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>

	// Disable exception handler warnings.
	#pragma warning(disable:4530)

	#include <fstream>

	#include "common/windows/string_utils-inl.h"

	#include "common/windows/http_upload.h"

	namespace google_breakpad {

	using std::ifstream;
	using std::ios;

	static const wchar_t kUserAgent[] = L"Breakpad/1.0 (Windows)";

	// Helper class which closes an internet handle when it goes away
	class HTTPUpload::AutoInternetHandle {
	public:
	explicit AutoInternetHandle(HINTERNET handle) : handle_(handle) {}
	~AutoInternetHandle() {
	if (handle_) {
	InternetCloseHandle(handle_);
	}
	}

	HINTERNET get() { return handle_; }

	private:
	HINTERNET handle_;
	};

	// static
	bool HTTPUpload::SendRequest(const wstring &url,
	const map<wstring, wstring> &parameters,
	const map<wstring, wstring> &files,
	int *timeout,
	wstring *response_body,
	int *response_code) {
	if (response_code) {
	*response_code = 0;
	}

	// TODO(bryner): support non-ASCII parameter names
	if (!CheckParameters(parameters)) {
	return false;
	}

	// Break up the URL and make sure we can handle it
	wchar_t scheme[16], host[256], path[256];
	URL_COMPONENTS components;
	memset(&components, 0, sizeof(components));
	components.dwStructSize = sizeof(components);
	components.lpszScheme = scheme;
	components.dwSchemeLength = sizeof(scheme) / sizeof(scheme[0]);
	components.lpszHostName = host;
	components.dwHostNameLength = sizeof(host) / sizeof(host[0]);
	components.lpszUrlPath = path;
	components.dwUrlPathLength = sizeof(path) / sizeof(path[0]);
	if (!InternetCrackUrl(url.c_str(), static_cast<DWORD>(url.size()),
	0, &components)) {
	return false;
	}
	bool secure = false;
	if (wcscmp(scheme, L"https") == 0) {
	secure = true;
	} else if (wcscmp(scheme, L"http") != 0) {
	return false;
	}

	AutoInternetHandle internet(InternetOpen(kUserAgent,
	INTERNET_OPEN_TYPE_PRECONFIG,
	NULL, // proxy name
	NULL, // proxy bypass
	0)); // flags
	if (!internet.get()) {
	return false;
	}

	AutoInternetHandle connection(InternetConnect(internet.get(),
	host,
	components.nPort,
	NULL, // user name
	NULL, // password
	INTERNET_SERVICE_HTTP,
	0, // flags
	NULL)); // context
	if (!connection.get()) {
	return false;
	}

	DWORD http_open_flags = secure ? INTERNET_FLAG_SECURE : 0;
	http_open_flags \|= INTERNET_FLAG_NO_COOKIES;
	AutoInternetHandle request(HttpOpenRequest(connection.get(),
	L"POST",
	path,
	NULL, // version
	NULL, // referer
	NULL, // agent type
	http_open_flags,
	NULL)); // context
	if (!request.get()) {
	return false;
	}

	wstring boundary = GenerateMultipartBoundary();
	wstring content_type_header = GenerateRequestHeader(boundary);
	HttpAddRequestHeaders(request.get(),
	content_type_header.c_str(),
	static_cast<DWORD>(-1),
	HTTP_ADDREQ_FLAG_ADD);

	string request_body;
	if (!GenerateRequestBody(parameters, files, boundary, &request_body)) {
	return false;
	}

	if (timeout) {
	if (!InternetSetOption(request.get(),
	INTERNET_OPTION_SEND_TIMEOUT,
	timeout,
	sizeof(*timeout))) {
	fwprintf(stderr, L"Could not unset send timeout, continuing...\n");
	}

	if (!InternetSetOption(request.get(),
	INTERNET_OPTION_RECEIVE_TIMEOUT,
	timeout,
	sizeof(*timeout))) {
	fwprintf(stderr, L"Could not unset receive timeout, continuing...\n");
	}
	}

	if (!HttpSendRequest(request.get(), NULL, 0,
	const_cast<char *>(request_body.data()),
	static_cast<DWORD>(request_body.size()))) {
	return false;
	}

	// The server indicates a successful upload with HTTP status 200.
	wchar_t http_status[4];
	DWORD http_status_size = sizeof(http_status);
	if (!HttpQueryInfo(request.get(), HTTP_QUERY_STATUS_CODE,
	static_cast<LPVOID>(&http_status), &http_status_size,
	0)) {
	return false;
	}

	int http_response = wcstol(http_status, NULL, 10);
	if (response_code) {
	*response_code = http_response;
	}

	bool result = (http_response == 200);

	if (result) {
	result = ReadResponse(request.get(), response_body);
	}

	return result;
	}

	// static
	bool HTTPUpload::ReadResponse(HINTERNET request, wstring *response) {
	bool has_content_length_header = false;
	wchar_t content_length[32];
	DWORD content_length_size = sizeof(content_length);
	DWORD claimed_size = 0;
	string response_body;

	if (HttpQueryInfo(request, HTTP_QUERY_CONTENT_LENGTH,
	static_cast<LPVOID>(&content_length),
	&content_length_size, 0)) {
	has_content_length_header = true;
	claimed_size = wcstol(content_length, NULL, 10);
	response_body.reserve(claimed_size);
	}


	DWORD bytes_available;
	DWORD total_read = 0;
	BOOL return_code;

	while (((return_code = InternetQueryDataAvailable(request, &bytes_available,
	0, 0)) != 0) && bytes_available > 0) {
	vector<char> response_buffer(bytes_available);
	DWORD size_read;

	return_code = InternetReadFile(request,
	&response_buffer[0],
	bytes_available, &size_read);

	if (return_code && size_read > 0) {
	total_read += size_read;
	response_body.append(&response_buffer[0], size_read);
	} else {
	break;
	}
	}

	bool succeeded = return_code && (!has_content_length_header \|\|
	(total_read == claimed_size));
	if (succeeded && response) {
	*response = UTF8ToWide(response_body);
	}

	return succeeded;
	}

	// static
	wstring HTTPUpload::GenerateMultipartBoundary() {
	// The boundary has 27 '-' characters followed by 16 hex digits
	static const wchar_t kBoundaryPrefix[] = L"---------------------------";
	static const int kBoundaryLength = 27 + 16 + 1;

	// Generate some random numbers to fill out the boundary
	int r0 = rand();
	int r1 = rand();

	wchar_t temp[kBoundaryLength];
	swprintf(temp, kBoundaryLength, L"%s%08X%08X", kBoundaryPrefix, r0, r1);

	// remove when VC++7.1 is no longer supported
	temp[kBoundaryLength - 1] = L'\0';

	return wstring(temp);
	}

	// static
	wstring HTTPUpload::GenerateRequestHeader(const wstring &boundary) {
	wstring header = L"Content-Type: multipart/form-data; boundary=";
	header += boundary;
	return header;
	}

	// static
	bool HTTPUpload::GenerateRequestBody(const map<wstring, wstring> &parameters,
	const map<wstring, wstring> &files,
	const wstring &boundary,
	string *request_body) {
	string boundary_str = WideToUTF8(boundary);
	if (boundary_str.empty()) {
	return false;
	}

	request_body->clear();

	// Append each of the parameter pairs as a form-data part
	for (map<wstring, wstring>::const_iterator pos = parameters.begin();
	pos != parameters.end(); ++pos) {
	request_body->append("--" + boundary_str + "\r\n");
	request_body->append("Content-Disposition: form-data; name=\"" +
	WideToUTF8(pos->first) + "\"\r\n\r\n" +
	WideToUTF8(pos->second) + "\r\n");
	}

	for (map<wstring, wstring>::const_iterator pos = files.begin();
	pos != files.end(); ++pos) {
	vector<char> contents;
	if (!GetFileContents(pos->second, &contents)) {
	return false;
	}

	// Now append the upload files as a binary (octet-stream) part
	string filename_utf8 = WideToUTF8(pos->second);
	if (filename_utf8.empty()) {
	return false;
	}

	string file_part_name_utf8 = WideToUTF8(pos->first);
	if (file_part_name_utf8.empty()) {
	return false;
	}

	request_body->append("--" + boundary_str + "\r\n");
	request_body->append("Content-Disposition: form-data; "
	"name=\"" + file_part_name_utf8 + "\"; "
	"filename=\"" + filename_utf8 + "\"\r\n");
	request_body->append("Content-Type: application/octet-stream\r\n");
	request_body->append("\r\n");

	if (!contents.empty()) {
	request_body->append(&(contents[0]), contents.size());
	}
	request_body->append("\r\n");
	}
	request_body->append("--" + boundary_str + "--\r\n");
	return true;
	}

	// static
	bool HTTPUpload::GetFileContents(const wstring &filename,
	vector<char> *contents) {
	bool rv = false;
	// The "open" method on pre-MSVC8 ifstream implementations doesn't accept a
	// wchar_t* filename, so use _wfopen directly in that case. For VC8 and
	// later, _wfopen has been deprecated in favor of _wfopen_s, which does
	// not exist in earlier versions, so let the ifstream open the file itself.
	// GCC doesn't support wide file name and opening on FILE* requires ugly
	// hacks, so fallback to multi byte file.
	#ifdef _MSC_VER
	ifstream file;
	file.open(filename.c_str(), ios::binary);
	#else // GCC
	ifstream file(WideToMBCP(filename, CP_ACP).c_str(), ios::binary);
	#endif // _MSC_VER >= 1400
	if (file.is_open()) {
	file.seekg(0, ios::end);
	std::streamoff length = file.tellg();
	// Check for loss of data when converting lenght from std::streamoff into
	// std::vector<char>::size_type
	std::vector<char>::size_type vector_size =
	static_cast<std::vector<char>::size_type>(length);
	if (static_cast<std::streamoff>(vector_size) == length) {
	contents->resize(vector_size);
	if (length != 0) {
	file.seekg(0, ios::beg);
	file.read(&((*contents)[0]), length);
	}
	rv = true;
	}
	file.close();
	}
	return rv;
	}

	// static
	wstring HTTPUpload::UTF8ToWide(const string &utf8) {
	if (utf8.length() == 0) {
	return wstring();
	}

	// compute the length of the buffer we'll need
	int charcount = MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, NULL, 0);

	if (charcount == 0) {
	return wstring();
	}

	// convert
	wchar_t* buf = new wchar_t[charcount];
	MultiByteToWideChar(CP_UTF8, 0, utf8.c_str(), -1, buf, charcount);
	wstring result(buf);
	delete[] buf;
	return result;
	}

	// static
	string HTTPUpload::WideToMBCP(const wstring &wide, unsigned int cp) {
	if (wide.length() == 0) {
	return string();
	}

	// compute the length of the buffer we'll need
	int charcount = WideCharToMultiByte(cp, 0, wide.c_str(), -1,
	NULL, 0, NULL, NULL);
	if (charcount == 0) {
	return string();
	}

	// convert
	char *buf = new char[charcount];
	WideCharToMultiByte(cp, 0, wide.c_str(), -1, buf, charcount,
	NULL, NULL);

	string result(buf);
	delete[] buf;
	return result;
	}

	// static
	bool HTTPUpload::CheckParameters(const map<wstring, wstring> &parameters) {
	for (map<wstring, wstring>::const_iterator pos = parameters.begin();
	pos != parameters.end(); ++pos) {
	const wstring &str = pos->first;
	if (str.size() == 0) {
	return false; // disallow empty parameter names
	}
	for (unsigned int i = 0; i < str.size(); ++i) {
	wchar_t c = str[i];
	if (c < 32 \|\| c == '"' \|\| c > 127) {
	return false;
	}
	}
	}
	return true;
	}

	} // namespace google_breakpad