From 80bde3fbfa74a884b71e6900b9b0be79fbbce35b Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Thu, 1 Oct 2015 14:59:12 +0200
Subject: [PATCH] Make antiword.exe relocatable on Windows

This change allows antiword to find its resource files relative to the
executable file: it is expected to live in `<prefix>/bin/antiword.exe`
and the resource files will be found in `<prefix>/share/antiword/`.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 antiword.h |  1 +
 fonts_u.c  |  2 +-
 misc.c     | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 options.c  | 17 +++--------------
 4 files changed, 68 insertions(+), 15 deletions(-)

diff --git a/antiword.h b/antiword.h
index 3f4aad5..d24b640 100644
--- a/antiword.h
+++ b/antiword.h
@@ -454,6 +454,7 @@ extern BOOL	bAllZero(const UCHAR *, size_t);
 extern BOOL	bGetNormalizedCodeset(char *, size_t, BOOL *);
 extern const char	*szGetDefaultMappingFile(void);
 extern time_t	tConvertDTTM(ULONG);
+extern FILE     *fOpenResource(const char *szFilename, const char *szSuffix);
 /* notes.c */
 extern void	vDestroyNotesInfoLists(void);
 extern void	vGetNotesInfo(FILE *, const pps_info_type *,
diff --git a/fonts_u.c b/fonts_u.c
index a99f7d2..280a7f2 100644
--- a/fonts_u.c
+++ b/fonts_u.c
@@ -78,7 +78,7 @@ pOpenFontTableFile(void)
 	szGlobalFile = GLOBAL_ANTIWORD_DIR FILE_SEPARATOR FONTNAMES_FILE;
 	DBG_MSG(szGlobalFile);
 
-	pFile = fopen(szGlobalFile, "r");
+	pFile = fOpenResource(FONTNAMES_FILE, "r");
 	if (pFile != NULL) {
 		return pFile;
 	}
diff --git a/misc.c b/misc.c
index 609a2f0..a9610d0 100644
--- a/misc.c
+++ b/misc.c
@@ -892,3 +892,66 @@ tConvertDTTM(ULONG ulDTTM)
 	NO_DBG_MSG(ctime(&tResult));
 	return tResult;
 } /* end of tConvertDTTM */
+
+#ifdef __MINGW64_VERSION_MAJOR
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+
+/*
+ * Opens an Antiword resource file
+ *
+ * returns the handle for the file, or NULL
+  */
+FILE
+*fOpenResource(const char *szFilename, const char *szSuffix)
+{
+#ifndef __MINGW64_VERSION_MAJOR
+	static char szPath[PATH_MAX+1];
+
+	snprintf(szPath, sizeof(szPath),
+		GLOBAL_ANTIWORD_DIR FILE_SEPARATOR "%s%s",
+		szFilename, szSuffix ? szSuffix : "");
+#else
+	static char szPath[32768];
+	static size_t tPrefixLen = (size_t)-1;
+
+	if (tPrefixLen == (size_t)-1) {
+		tPrefixLen = (size_t)
+			GetModuleFileName(NULL, szPath, sizeof(szPath));
+		if (tPrefixLen && tPrefixLen < sizeof(szPath)) {
+			const char *dir = GLOBAL_ANTIWORD_DIR;
+
+			/* Strip suffix `antiword.exe` */
+			while (tPrefixLen > 0 && szPath[tPrefixLen-1] != '\\') {
+				tPrefixLen--;
+			}
+			/* Strip `bin/` directory */
+			if (tPrefixLen > 5 && !memcmp(szPath+(tPrefixLen-5),
+					"\\bin\\",5)) {
+				tPrefixLen -= 4;
+			}
+			/* Append GLOBAL_ANTIWORD_DIR, skipping /usr/ or / */
+			if (*dir && *dir == '/') {
+				dir++;
+				if (!memcmp(dir, "usr/", 4))
+					dir += 4;
+			}
+			while (*dir && tPrefixLen < sizeof(szPath)-1) {
+				char c = *(dir++);
+				szPath[tPrefixLen++] = c == '/' ? '\\' : c;
+			}
+			/* Make sure the prefix ends in a file separator */
+			if (tPrefixLen && tPrefixLen < sizeof(szPath)-1 &&
+					szPath[tPrefixLen-1] != '\\') {
+				szPath[tPrefixLen++] = '\\';
+			}
+			szPath[tPrefixLen]='\0';
+		}
+	}
+
+	snprintf(szPath + tPrefixLen, sizeof(szPath) - tPrefixLen,
+		"%s%s", szFilename, szSuffix ? szSuffix : "");
+#endif
+	return fopen(szPath, "r");
+} /* end of fOpenResource */
diff --git a/options.c b/options.c
index 8379fef..dd6ced9 100644
--- a/options.c
+++ b/options.c
@@ -236,20 +236,9 @@ pOpenCharacterMappingFile(const char *szLeafname)
 	}
 
 	/* Try the global version of the mapping file */
-	if (tFilenameLen <
-	    sizeof(szMappingFile) -
-	    sizeof(GLOBAL_ANTIWORD_DIR) -
-	    sizeof(FILE_SEPARATOR)) {
-		sprintf(szMappingFile,
-			GLOBAL_ANTIWORD_DIR FILE_SEPARATOR "%s%s",
-			szLeafname, szSuffix);
-		DBG_MSG(szMappingFile);
-		pFile = fopen(szMappingFile, "r");
-		if (pFile != NULL) {
-			return pFile;
-		}
-	} else {
-		werr(0, "Global mappingfilename too long, ignored");
+	pFile = fOpenResource(szLeafname, szSuffix);
+	if (pFile != NULL) {
+		return pFile;
 	}
 	werr(0, "I can't open your mapping file (%s%s)\n"
 		"It is not in '%s" FILE_SEPARATOR ANTIWORD_DIR "' nor in '"
-- 
2.5.3.windows.1