Utility functions for reading from zip files. Some small enhancements to allow direct opening of non-compressed files. Requires zlib.

git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@26 fc73d0e0-1445-4013-8a0c-d673dee63da5

engine/libs/unzip.c

@@ -0,0 +1,940 @@
+/* unzip.c -- IO on .zip files using zlib 
+   Version 0.15 beta, Mar 19th, 1998,
+
+   Read unzip.h for more info
+*/
+
+//# pragma comment (lib, "zip/zlib.lib") 
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifndef __linux__
+#define ZEXPORT VARGS
+#endif
+#include "zlib.h"
+#include "unzip.h"
+
+#ifdef STDC
+#  include <stddef.h>
+#  include <string.h>
+#  include <stdlib.h>
+#endif
+#ifdef NO_ERRNO_H
+    extern int errno;
+#else
+#   include <errno.h>
+#endif
+
+
+#ifndef local
+#  define local static
+#endif
+/* compile with -Dlocal if your debugger can't find static symbols */
+
+
+
+#if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES) && \
+                      !defined(CASESENSITIVITYDEFAULT_NO)
+#define CASESENSITIVITYDEFAULT_NO
+#endif
+
+
+#ifndef UNZ_BUFSIZE
+#define UNZ_BUFSIZE (16384)
+#endif
+
+#ifndef UNZ_MAXFILENAMEINZIP
+#define UNZ_MAXFILENAMEINZIP (256)
+#endif
+
+#ifndef ALLOC
+# define ALLOC(size) (malloc(size))
+#endif
+#ifndef TRYFREE
+# define TRYFREE(p) {if (p) free(p);}
+#endif
+
+#define SIZECENTRALDIRITEM (0x2e)
+#define SIZEZIPLOCALHEADER (0x1e)
+
+
+/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */
+
+#ifndef SEEK_CUR
+#define SEEK_CUR    1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END    2
+#endif
+
+#ifndef SEEK_SET
+#define SEEK_SET    0
+#endif
+
+/* unz_file_info_interntal contain internal info about a file in zipfile*/
+typedef struct unz_file_info_internal_s {
+    uLong offset_curfile;/* relative offset of local header 4 bytes */
+} unz_file_info_internal;
+
+
+/* file_in_zip_read_info_s contain internal information about a file in zipfile,
+    when reading and decompress it */
+typedef struct {
+	char  *read_buffer;         /* internal buffer for compressed data */
+	z_stream stream;            /* zLib stream structure for inflate */
+
+	uLong pos_in_zipfile;       /* position in byte on the zipfile, for fseek*/
+	uLong stream_initialised;   /* flag set if stream structure is initialised*/
+
+	uLong offset_local_extrafield;/* offset of the local extra field */
+	uInt  size_local_extrafield;/* size of the local extra field */
+	uLong pos_local_extrafield;   /* position in the local extra field in read*/
+
+	uLong crc32;                /* crc32 of all data uncompressed */
+	uLong crc32_wait;           /* crc32 we must obtain after decompress all */
+	uLong rest_read_compressed; /* number of byte to be decompressed */
+	uLong rest_read_uncompressed;/*number of byte to be obtained after decomp*/
+	FILE* file;                 /* io structore of the zipfile */
+	uLong compression_method;   /* compression method (0==store) */
+	uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
+} file_in_zip_read_info_s;
+
+
+/* unz_s contain internal information about the zipfile
+*/
+typedef struct {
+	FILE* file;                 /* io structore of the zipfile */
+	unz_global_info gi;       /* public global information */
+	uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
+	uLong num_file;             /* number of the current file in the zipfile*/
+	uLong pos_in_central_dir;   /* pos of the current file in the central dir*/
+	uLong current_file_ok;      /* flag about the usability of the current file*/
+	uLong central_pos;          /* position of the beginning of the central dir*/
+
+	uLong size_central_dir;     /* size of the central directory  */
+	uLong offset_central_dir;   /* offset of start of central directory with
+								   respect to the starting disk number */
+
+	unz_file_info cur_file_info; /* public info about the current file in zip*/
+	unz_file_info_internal cur_file_info_internal; /* private info about it*/
+    file_in_zip_read_info_s* pfile_in_zip_read; /* structure about the current
+	                                    file if we are decompressing it */
+} unz_s;
+
+
+/* ===========================================================================
+     Read a byte from a gz_stream; update next_in and avail_in. Return EOF
+   for end of file.
+   IN assertion: the stream s has been sucessfully opened for reading.
+*/
+
+
+local int unzlocal_getShort(FILE *fin,uLong *pi) {
+    unsigned short c;
+	int err = fread(&c, 2, 1, fin);
+    if (err==1) {
+        *pi = (uLong)c;
+        return UNZ_OK;
+    } else {
+        if (ferror(fin)) return UNZ_ERRNO;
+        else return UNZ_EOF;
+    }
+}
+
+local int unzlocal_getLong(FILE *fin,uLong *pi) {
+    uLong c;
+	int err = fread(&c, 4, 1, fin);
+    if (err==1) {
+        *pi = (uLong)c;
+        return UNZ_OK;
+    } else {
+        if (ferror(fin)) return UNZ_ERRNO;
+        else return UNZ_EOF;
+    }
+}
+
+
+#define BUFREADCOMMENT (0x400)
+
+/*
+  Locate the Central directory of a zipfile (at the end, just before
+    the global comment)
+*/
+local uLong unzlocal_SearchCentralDir(FILE *fin) {
+	unsigned char* buf;
+	uLong uSizeFile;
+	uLong uBackRead;
+	uLong uMaxBack=0xffff; /* maximum size of global comment */
+	uLong uPosFound=0;
+	
+	if (fseek(fin,0,SEEK_END) != 0) return 0;
+
+	uSizeFile = ftell( fin );
+	
+	if (uMaxBack>uSizeFile) uMaxBack = uSizeFile;
+
+	buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
+	if (!buf) return 0;
+
+	uBackRead = 4;
+	while (uBackRead<uMaxBack) {
+		uLong uReadSize,uReadPos ;
+		int i;
+		if (uBackRead+BUFREADCOMMENT>uMaxBack) uBackRead = uMaxBack;
+		else uBackRead+=BUFREADCOMMENT;
+		uReadPos = uSizeFile-uBackRead ;
+		
+		uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ? 
+                     (BUFREADCOMMENT+4) : (uSizeFile-uReadPos);
+		if (fseek(fin,uReadPos,SEEK_SET)!=0) break;
+
+		if (fread(buf,(uInt)uReadSize,1,fin)!=1) break;
+
+		for (i=(int)uReadSize-3; (i--)>0;)
+			if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) && 
+				((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06)) {
+				uPosFound = uReadPos+i;
+				break;
+			}
+
+		if (uPosFound!=0) break;
+	}
+	TRYFREE(buf);
+	return uPosFound;
+}
+
+/*
+  Open a Zip file. path contain the full pathname (by example,
+     on a Windows NT computer "c:\\test\\zlib109.zip" or on an Unix computer
+	 "zlib/zlib109.zip".
+	 If the zipfile cannot be opened (file don't exist or in not valid), the
+	   return value is NULL.
+     Else, the return value is a unzFile Handle, usable with other function
+	   of this unzip package.
+*/
+extern unzFile ZEXPORT unzOpen (const char *path) {
+	unz_s us;
+	unz_s *s;
+	uLong central_pos,uL;
+	FILE * fin ;
+
+	uLong number_disk;          /* number of the current dist, used for 
+								   spaning ZIP, unsupported, always 0*/
+	uLong number_disk_with_CD;  /* number the the disk with central dir, used
+								   for spaning ZIP, unsupported, always 0*/
+	uLong number_entry_CD;      /* total number of entries in
+	                               the central dir 
+	                               (same than number_entry on nospan) */
+
+	int err=UNZ_OK;
+
+    fin=fopen(path,"rb");
+	if (!fin) return NULL;
+
+	central_pos = unzlocal_SearchCentralDir(fin);
+	if (!central_pos) err=UNZ_ERRNO;
+
+	if (fseek(fin,central_pos,SEEK_SET)!=0) err=UNZ_ERRNO;
+
+	/* the signature, already checked */
+	if (unzlocal_getLong(fin,&uL)!=UNZ_OK) err=UNZ_ERRNO;
+
+	/* number of this disk */
+	if (unzlocal_getShort(fin,&number_disk)!=UNZ_OK) err=UNZ_ERRNO;
+
+	/* number of the disk with the start of the central directory */
+	if (unzlocal_getShort(fin,&number_disk_with_CD)!=UNZ_OK) err=UNZ_ERRNO;
+
+	/* total number of entries in the central dir on this disk */
+	if (unzlocal_getShort(fin,&us.gi.number_entry)!=UNZ_OK) err=UNZ_ERRNO;
+
+	/* total number of entries in the central dir */
+	if (unzlocal_getShort(fin,&number_entry_CD)!=UNZ_OK) err=UNZ_ERRNO;
+
+	if ((number_entry_CD!=us.gi.number_entry) || (number_disk_with_CD!=0) || (number_disk!=0)) err=UNZ_BADZIPFILE;
+
+	/* size of the central directory */
+	if (unzlocal_getLong(fin,&us.size_central_dir)!=UNZ_OK) err=UNZ_ERRNO;
+
+	/* offset of start of central directory with respect to the 
+	      starting disk number */
+	if (unzlocal_getLong(fin,&us.offset_central_dir)!=UNZ_OK) err=UNZ_ERRNO;
+
+	/* zipfile comment length */
+	if (unzlocal_getShort(fin,&us.gi.size_comment)!=UNZ_OK) err=UNZ_ERRNO;
+
+	if ((central_pos<us.offset_central_dir+us.size_central_dir) && (err==UNZ_OK)) err=UNZ_BADZIPFILE;
+
+	if (err!=UNZ_OK) {
+		fclose(fin);
+		return NULL;
+	}
+
+	us.file=fin;
+	us.byte_before_the_zipfile = central_pos - (us.offset_central_dir+us.size_central_dir);
+	us.central_pos = central_pos;
+    us.pfile_in_zip_read = NULL;
+	
+
+	s=(unz_s*)ALLOC(sizeof(unz_s));
+	*s=us;
+	unzGoToFirstFile((unzFile)s);	
+	return (unzFile)s;	
+}
+
+
+/*
+  Close a ZipFile opened with unzipOpen.
+  If there is files inside the .Zip opened with unzipOpenCurrentFile (see later),
+    these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
+  return UNZ_OK if there is no problem. */
+extern int ZEXPORT unzClose (unzFile file) {
+	unz_s* s;
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+
+    if (s->pfile_in_zip_read) unzCloseCurrentFile(file);
+
+	fclose(s->file);
+	TRYFREE(s);
+	return UNZ_OK;
+}
+
+
+/*
+  Write info about the ZipFile in the *pglobal_info structure.
+  No preparation of the structure is needed
+  return UNZ_OK if there is no problem. */
+extern int ZEXPORT unzGetGlobalInfo (unzFile file, unz_global_info *pglobal_info) {
+	unz_s* s;
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+	*pglobal_info=s->gi;
+	return UNZ_OK;
+}
+
+
+/*
+  Get Info about the current file in the zipfile, with internal only info
+*/
+local int unzlocal_GetCurrentFileInfoInternal OF((unzFile file,
+                                                  unz_file_info *pfile_info,
+                                                  unz_file_info_internal 
+                                                  *pfile_info_internal,
+                                                  char *szFileName,
+												  uLong fileNameBufferSize,
+                                                  void *extraField,
+												  uLong extraFieldBufferSize,
+                                                  char *szComment,
+												  uLong commentBufferSize));
+
+local int unzlocal_GetCurrentFileInfoInternal (unzFile file,
+                                              unz_file_info *pfile_info,
+                                              unz_file_info_internal *pfile_info_internal,
+                                              char *szFileName, uLong fileNameBufferSize,
+                                              void *extraField, uLong extraFieldBufferSize,
+                                              char *szComment,  uLong commentBufferSize) {
+	unz_s* s;
+	unz_file_info file_info;
+	unz_file_info_internal file_info_internal;
+	int err=UNZ_OK;
+	uLong uMagic;
+	long lSeek=0;
+
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+	if (fseek(s->file,s->pos_in_central_dir+s->byte_before_the_zipfile,SEEK_SET)!=0) err=UNZ_ERRNO;
+
+
+	/* we check the magic */
+	if (err==UNZ_OK) 
+	{
+		if (unzlocal_getLong(s->file,&uMagic) != UNZ_OK) err=UNZ_ERRNO;
+		else if (uMagic!=0x02014b50) err=UNZ_BADZIPFILE;
+	}
+
+	fread(&file_info, sizeof(file_info)-2*4, 1, s->file); // 2*4 is the size of 2 my vars
+
+	if (unzlocal_getLong(s->file,&file_info_internal.offset_curfile) != UNZ_OK) err=UNZ_ERRNO;
+
+	file_info.offset = file_info_internal.offset_curfile;
+	file_info.c_offset = s->pos_in_central_dir;
+
+	lSeek+=file_info.size_filename;
+	if ((err==UNZ_OK) && (szFileName))
+	{
+		uLong uSizeRead ;
+		if (file_info.size_filename<fileNameBufferSize)
+		{
+			*(szFileName+file_info.size_filename)='\0';
+			uSizeRead = file_info.size_filename;
+		}
+		else uSizeRead = fileNameBufferSize;
+
+		if ((file_info.size_filename>0) && (fileNameBufferSize>0))
+			if (fread(szFileName,(uInt)uSizeRead,1,s->file)!=1) err=UNZ_ERRNO;
+		lSeek -= uSizeRead;
+	}
+
+	
+	if ((err==UNZ_OK) && (extraField))
+	{
+		uLong uSizeRead ;
+		if (file_info.size_file_extra<extraFieldBufferSize) uSizeRead = file_info.size_file_extra;
+		else uSizeRead = extraFieldBufferSize;
+
+		if (lSeek!=0) 
+		{
+			if (fseek(s->file,lSeek,SEEK_CUR)==0) lSeek=0;
+			else err=UNZ_ERRNO;
+		}
+		if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0))
+			if (fread(extraField,(uInt)uSizeRead,1,s->file)!=1) err=UNZ_ERRNO;
+		lSeek += file_info.size_file_extra - uSizeRead;
+	}
+	else lSeek+=file_info.size_file_extra; 
+
+	
+	if ((err==UNZ_OK) && (szComment))
+	{
+		uLong uSizeRead ;
+		if (file_info.size_file_comment<commentBufferSize) {
+			*(szComment+file_info.size_file_comment)='\0';
+			uSizeRead = file_info.size_file_comment;
+		} else uSizeRead = commentBufferSize;
+
+		if (lSeek!=0)
+		{
+			if (fseek(s->file,lSeek,SEEK_CUR)==0) lSeek=0;
+			else err=UNZ_ERRNO;
+		}
+		if ((file_info.size_file_comment>0) && (commentBufferSize>0))
+			if (fread(szComment,(uInt)uSizeRead,1,s->file)!=1) err=UNZ_ERRNO;
+		lSeek+=file_info.size_file_comment - uSizeRead;
+	} else lSeek+=file_info.size_file_comment;
+
+	if ((err==UNZ_OK) && (pfile_info)) *pfile_info=file_info;
+
+	if ((err==UNZ_OK) && (pfile_info_internal)) *pfile_info_internal=file_info_internal;
+
+	return err;
+}
+
+
+
+/*
+  Write info about the ZipFile in the *pglobal_info structure.
+  No preparation of the structure is needed
+  return UNZ_OK if there is no problem.
+*/
+extern int ZEXPORT unzGetCurrentFileInfo (unzFile file,
+											unz_file_info *pfile_info,
+											char *szFileName, uLong fileNameBufferSize,
+											void *extraField, uLong extraFieldBufferSize,
+											char *szComment,  uLong commentBufferSize) {
+	return unzlocal_GetCurrentFileInfoInternal(file,pfile_info,NULL,
+												szFileName,fileNameBufferSize,
+												extraField,extraFieldBufferSize,
+												szComment,commentBufferSize);
+}
+
+/*
+  Set the current file of the zipfile to the first file.
+  return UNZ_OK if there is no problem
+*/
+extern int ZEXPORT unzGoToFirstFile (unzFile file) {
+	int err=UNZ_OK;
+	unz_s* s;
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+	s->pos_in_central_dir=s->offset_central_dir;
+	s->num_file=0;
+	err=unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
+											 &s->cur_file_info_internal,
+											 NULL,0,NULL,0,NULL,0);
+	s->current_file_ok = (err == UNZ_OK);
+	return err;
+}
+
+
+/*
+  Set the current file of the zipfile to the next file.
+  return UNZ_OK if there is no problem
+  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
+*/
+extern int ZEXPORT unzGoToNextFile (unzFile file) {
+	unz_s* s;	
+	int err;
+
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+	if (!s->current_file_ok) return UNZ_END_OF_LIST_OF_FILE;
+	if (s->num_file+1==s->gi.number_entry) return UNZ_END_OF_LIST_OF_FILE;
+
+	s->pos_in_central_dir += SIZECENTRALDIRITEM + s->cur_file_info.size_filename +
+			s->cur_file_info.size_file_extra + s->cur_file_info.size_file_comment ;
+	s->num_file++;
+	err = unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,
+											   &s->cur_file_info_internal,
+											   NULL,0,NULL,0,NULL,0);
+	s->current_file_ok = (err == UNZ_OK);
+	return err;
+}
+
+
+extern int ZEXPORT unzLocateFileMy (unzFile file, uLong num, uLong pos) {
+	unz_s* s;	
+	s = (unz_s *)file;
+	s->pos_in_central_dir = pos;
+	s->num_file = num;
+	unzlocal_GetCurrentFileInfoInternal(file,&s->cur_file_info,&s->cur_file_info_internal,NULL,0,NULL,0,NULL,0);
+	return 1;
+}
+
+
+/*
+  Read the local header of the current zipfile
+  Check the coherency of the local header and info in the end of central
+        directory about this file
+  store in *piSizeVar the size of extra info in local header
+        (filename and size of extra field data)
+*/
+local int unzlocal_CheckCurrentFileCoherencyHeader (unz_s *s, uInt *piSizeVar,
+													uLong *poffset_local_extrafield,
+													uInt *psize_local_extrafield) {
+	uLong uMagic,uData,uFlags;
+	uLong size_filename;
+	uLong size_extra_field;
+	int err=UNZ_OK;
+
+	*piSizeVar = 0;
+	*poffset_local_extrafield = 0;
+	*psize_local_extrafield = 0;
+
+	if (fseek(s->file,s->cur_file_info_internal.offset_curfile + s->byte_before_the_zipfile,SEEK_SET)!=0) return UNZ_ERRNO;
+
+
+	if (err==UNZ_OK)
+	{
+		if (unzlocal_getLong(s->file,&uMagic) != UNZ_OK) err=UNZ_ERRNO;
+		else if (uMagic!=0x04034b50) err=UNZ_BADZIPFILE;
+	}
+
+	if (unzlocal_getShort(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO;
+
+	if (unzlocal_getShort(s->file,&uFlags) != UNZ_OK)
+		err=UNZ_ERRNO;
+
+	if (unzlocal_getShort(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO;
+	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compression_method)) err=UNZ_BADZIPFILE;
+
+    if ((err==UNZ_OK) && (s->cur_file_info.compression_method!=0) && (s->cur_file_info.compression_method!=Z_DEFLATED)) err=UNZ_BADZIPFILE;
+
+	/* date/time */
+	if (unzlocal_getLong(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO;
+
+	/* crc */
+	if (unzlocal_getLong(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO;
+	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) && ((uFlags & 8)==0)) err=UNZ_BADZIPFILE;
+
+	/* size compr */
+	if (unzlocal_getLong(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO;
+	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) && ((uFlags & 8)==0)) err=UNZ_BADZIPFILE;
+
+	 /* size uncompr */
+	if (unzlocal_getLong(s->file,&uData) != UNZ_OK) err=UNZ_ERRNO;
+	else if ((err==UNZ_OK) && (uData!=s->cur_file_info.uncompressed_size) && ((uFlags & 8)==0)) err=UNZ_BADZIPFILE;
+
+
+	if (unzlocal_getShort(s->file,&size_filename) != UNZ_OK) err=UNZ_ERRNO;
+	else if ((err==UNZ_OK) && (size_filename!=s->cur_file_info.size_filename)) err=UNZ_BADZIPFILE;
+
+	*piSizeVar += (uInt)size_filename;
+
+	if (unzlocal_getShort(s->file,&size_extra_field) != UNZ_OK)	err=UNZ_ERRNO;
+	*poffset_local_extrafield= s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + size_filename;
+	*psize_local_extrafield = (uInt)size_extra_field;
+
+	*piSizeVar += (uInt)size_extra_field;
+
+	return err;
+}
+												
+/*
+  Open for reading data the current file in the zipfile.
+  If there is no error and the file is opened, the return value is UNZ_OK.
+*/
+extern int ZEXPORT unzOpenCurrentFile (unzFile file) {
+	int err=UNZ_OK;
+	int Store;
+	uInt iSizeVar;
+	unz_s* s;
+	file_in_zip_read_info_s* pfile_in_zip_read_info;
+	uLong offset_local_extrafield;  /* offset of the local extra field */
+	uInt  size_local_extrafield;    /* size of the local extra field */
+
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+	if (!s->current_file_ok) return UNZ_PARAMERROR;
+
+    if (s->pfile_in_zip_read) unzCloseCurrentFile(file);
+
+	if (unzlocal_CheckCurrentFileCoherencyHeader(s,&iSizeVar, &offset_local_extrafield,&size_local_extrafield)!=UNZ_OK) return UNZ_BADZIPFILE;
+
+	pfile_in_zip_read_info = (file_in_zip_read_info_s*)ALLOC(sizeof(file_in_zip_read_info_s));
+	if (!pfile_in_zip_read_info) return UNZ_INTERNALERROR;
+
+	pfile_in_zip_read_info->read_buffer=(char*)ALLOC(UNZ_BUFSIZE);
+	pfile_in_zip_read_info->offset_local_extrafield = offset_local_extrafield;
+	pfile_in_zip_read_info->size_local_extrafield = size_local_extrafield;
+	pfile_in_zip_read_info->pos_local_extrafield=0;
+
+	if (!pfile_in_zip_read_info->read_buffer) {
+		TRYFREE(pfile_in_zip_read_info);
+		return UNZ_INTERNALERROR;
+	}
+
+	pfile_in_zip_read_info->stream_initialised=0;
+	
+	if ((s->cur_file_info.compression_method!=0) && (s->cur_file_info.compression_method!=Z_DEFLATED)) err=UNZ_BADZIPFILE;
+	Store = s->cur_file_info.compression_method==0;
+
+	pfile_in_zip_read_info->crc32_wait=s->cur_file_info.crc;
+	pfile_in_zip_read_info->crc32=0;
+	pfile_in_zip_read_info->compression_method = s->cur_file_info.compression_method;
+	pfile_in_zip_read_info->file=s->file;
+	pfile_in_zip_read_info->byte_before_the_zipfile=s->byte_before_the_zipfile;
+
+    pfile_in_zip_read_info->stream.total_out = 0;
+
+	if (!Store)	{
+	  pfile_in_zip_read_info->stream.zalloc = (alloc_func)0;
+	  pfile_in_zip_read_info->stream.zfree = (free_func)0;
+	  pfile_in_zip_read_info->stream.opaque = (voidpf)0; 
+      
+	  err=inflateInit2(&pfile_in_zip_read_info->stream, -MAX_WBITS);
+	  if (err == Z_OK) pfile_in_zip_read_info->stream_initialised=1;
+        /* windowBits is passed < 0 to tell that there is no zlib header.
+         * Note that in this case inflate *requires* an extra "dummy" byte
+         * after the compressed stream in order to complete decompression and
+         * return Z_STREAM_END. 
+         * In unzip, i don't wait absolutely Z_STREAM_END because I known the 
+         * size of both compressed and uncompressed data
+         */
+	}
+	pfile_in_zip_read_info->rest_read_compressed = s->cur_file_info.compressed_size ;
+	pfile_in_zip_read_info->rest_read_uncompressed = s->cur_file_info.uncompressed_size ;
+
+	
+	pfile_in_zip_read_info->pos_in_zipfile = s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + iSizeVar;
+	
+	pfile_in_zip_read_info->stream.avail_in = (uInt)0;
+
+
+	s->pfile_in_zip_read = pfile_in_zip_read_info;
+    return UNZ_OK;
+}
+
+
+
+
+//dmw's addition
+extern FILE* ZEXPORT unzOpenCurrentFileFile (unzFile file, char *zipwasnamed)
+{
+	FILE *F;
+//	int Store;
+	uInt iSizeVar;
+	uInt pos;
+	unz_s* s;
+//	file_in_zip_read_info_s* pfile_in_zip_read_info;
+	uLong offset_local_extrafield;  /* offset of the local extra field */
+	uInt  size_local_extrafield;    /* size of the local extra field */
+
+	if (!file) return NULL;
+	s=(unz_s*)file;
+	if (!s->current_file_ok) return NULL;
+
+    if (s->pfile_in_zip_read) unzCloseCurrentFile(file);
+
+	if (unzlocal_CheckCurrentFileCoherencyHeader(s,&iSizeVar, &offset_local_extrafield,&size_local_extrafield)!=UNZ_OK) return NULL;
+
+
+
+	if (s->cur_file_info.compression_method!=0) return NULL;	
+
+	//opens a file into the uncompressed steam.
+	pos = s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + iSizeVar;
+
+	F = fopen (zipwasnamed, "rb");
+
+	if (!F)
+		Sys_Error ("Couldn't reopen %s", zipwasnamed);	
+	fseek (F, pos, SEEK_SET);
+    return F;
+}
+
+extern int ZEXPORT unzGetCurrentFileUncompressedPos (unzFile file) {
+//	int err=UNZ_OK;
+//	int Store;
+	uInt iSizeVar;
+	uInt pos;
+	unz_s* s;
+//	file_in_zip_read_info_s* pfile_in_zip_read_info;
+	uLong offset_local_extrafield;  /* offset of the local extra field */
+	uInt  size_local_extrafield;    /* size of the local extra field */
+
+	if (!file) return -1;
+	s=(unz_s*)file;
+	if (!s->current_file_ok) return -1;
+
+    if (s->pfile_in_zip_read) unzCloseCurrentFile(file);
+
+	if (unzlocal_CheckCurrentFileCoherencyHeader(s,&iSizeVar, &offset_local_extrafield,&size_local_extrafield)!=UNZ_OK) return -1;
+
+
+
+	if (s->cur_file_info.compression_method!=0) return -1;	
+
+	//opens a file into the uncompressed steam.
+	pos = s->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER + iSizeVar;
+
+	return pos;
+}
+
+
+
+
+/*
+  Read bytes from the current file.
+  buf contain buffer where data must be copied
+  len the size of buf.
+
+  return the number of byte copied if somes bytes are copied
+  return 0 if the end of file was reached
+  return <0 with error code if there is an error
+    (UNZ_ERRNO for IO error, or zLib error for uncompress error)
+*/
+extern int ZEXPORT unzReadCurrentFile  (unzFile file, voidp buf, unsigned len) {
+	int err=UNZ_OK;
+	uInt iRead = 0;
+	unz_s* s;
+	file_in_zip_read_info_s* pfile_in_zip_read_info;
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+	if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;
+
+
+	if ((!pfile_in_zip_read_info->read_buffer)) return UNZ_END_OF_LIST_OF_FILE;
+	if (!len) return 0;
+
+	pfile_in_zip_read_info->stream.next_out = (Bytef*)buf;
+
+	pfile_in_zip_read_info->stream.avail_out = (uInt)len;
+	
+	if (len>pfile_in_zip_read_info->rest_read_uncompressed)
+		pfile_in_zip_read_info->stream.avail_out = (uInt)pfile_in_zip_read_info->rest_read_uncompressed;
+
+	while (pfile_in_zip_read_info->stream.avail_out>0) {
+		if ((pfile_in_zip_read_info->stream.avail_in==0) && (pfile_in_zip_read_info->rest_read_compressed>0)) {
+			uInt uReadThis = UNZ_BUFSIZE;
+			if (pfile_in_zip_read_info->rest_read_compressed<uReadThis) uReadThis = (uInt)pfile_in_zip_read_info->rest_read_compressed;
+			if (!uReadThis) return UNZ_EOF;
+			if (fseek(pfile_in_zip_read_info->file,
+                      pfile_in_zip_read_info->pos_in_zipfile + 
+                         pfile_in_zip_read_info->byte_before_the_zipfile,SEEK_SET)!=0) return UNZ_ERRNO;
+			if (fread(pfile_in_zip_read_info->read_buffer,uReadThis,1,pfile_in_zip_read_info->file)!=1)	return UNZ_ERRNO;
+			pfile_in_zip_read_info->pos_in_zipfile += uReadThis;
+
+			pfile_in_zip_read_info->rest_read_compressed-=uReadThis;
+			
+			pfile_in_zip_read_info->stream.next_in = 
+                (Bytef*)pfile_in_zip_read_info->read_buffer;
+			pfile_in_zip_read_info->stream.avail_in = (uInt)uReadThis;
+		}
+
+		if (pfile_in_zip_read_info->compression_method==0) {
+			uInt uDoCopy,i ;
+			if (pfile_in_zip_read_info->stream.avail_out < pfile_in_zip_read_info->stream.avail_in) uDoCopy = pfile_in_zip_read_info->stream.avail_out ;
+			else uDoCopy = pfile_in_zip_read_info->stream.avail_in ;
+				
+			for (i=0;i<uDoCopy;i++)
+				*(pfile_in_zip_read_info->stream.next_out+i) = *(pfile_in_zip_read_info->stream.next_in+i);
+					
+			pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32, pfile_in_zip_read_info->stream.next_out, uDoCopy);
+			pfile_in_zip_read_info->rest_read_uncompressed-=uDoCopy;
+			pfile_in_zip_read_info->stream.avail_in -= uDoCopy;
+			pfile_in_zip_read_info->stream.avail_out -= uDoCopy;
+			pfile_in_zip_read_info->stream.next_out += uDoCopy;
+			pfile_in_zip_read_info->stream.next_in += uDoCopy;
+            pfile_in_zip_read_info->stream.total_out += uDoCopy;
+			iRead += uDoCopy;
+		} else {
+			uLong uTotalOutBefore,uTotalOutAfter;
+			const Bytef *bufBefore;
+			uLong uOutThis;
+			int flush=Z_SYNC_FLUSH;
+
+			uTotalOutBefore = pfile_in_zip_read_info->stream.total_out;
+			bufBefore = pfile_in_zip_read_info->stream.next_out;
+
+			err=inflate(&pfile_in_zip_read_info->stream,flush);
+
+			uTotalOutAfter = pfile_in_zip_read_info->stream.total_out;
+			uOutThis = uTotalOutAfter-uTotalOutBefore;
+			
+			pfile_in_zip_read_info->crc32 = crc32(pfile_in_zip_read_info->crc32,bufBefore, (uInt)(uOutThis));
+
+			pfile_in_zip_read_info->rest_read_uncompressed -= uOutThis;
+
+			iRead += (uInt)(uTotalOutAfter - uTotalOutBefore);
+            
+			if (err==Z_STREAM_END) return (iRead==0) ? UNZ_EOF : iRead;
+			if (err!=Z_OK) break;
+		}
+	}
+
+	if (err==Z_OK) return iRead;
+	return err;
+}
+
+
+/*
+  Give the current position in uncompressed data
+*/
+extern z_off_t ZEXPORT unztell (unzFile file) {
+	unz_s* s;
+	file_in_zip_read_info_s* pfile_in_zip_read_info;
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+	if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;
+
+	return (z_off_t)pfile_in_zip_read_info->stream.total_out;
+}
+
+
+/*
+  return 1 if the end of file was reached, 0 elsewhere 
+*/
+extern int ZEXPORT unzeof (unzFile file) {
+	unz_s* s;
+	file_in_zip_read_info_s* pfile_in_zip_read_info;
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+	if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;
+	
+	if (pfile_in_zip_read_info->rest_read_uncompressed == 0) return 1;
+	else return 0;
+}
+
+
+
+/*
+  Read extra field from the current file (opened by unzOpenCurrentFile)
+  This is the local-header version of the extra field (sometimes, there is
+    more info in the local-header version than in the central-header)
+
+  if buf==NULL, it return the size of the local extra field that can be read
+
+  if buf!=NULL, len is the size of the buffer, the extra header is copied in
+	buf.
+  the return value is the number of bytes copied in buf, or (if <0) 
+	the error code
+*/
+extern int ZEXPORT unzGetLocalExtrafield (unzFile file,voidp buf,unsigned len) {
+	unz_s* s;
+	file_in_zip_read_info_s* pfile_in_zip_read_info;
+	uInt read_now;
+	uLong size_to_read;
+
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+	if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;
+
+	size_to_read = (pfile_in_zip_read_info->size_local_extrafield - pfile_in_zip_read_info->pos_local_extrafield);
+
+	if (!buf) return (int)size_to_read;
+	
+	if (len>size_to_read) read_now = (uInt)size_to_read;
+	else read_now = (uInt)len ;
+
+	if (!read_now) return 0;
+	
+	if (fseek(pfile_in_zip_read_info->file,
+              pfile_in_zip_read_info->offset_local_extrafield + 
+			  pfile_in_zip_read_info->pos_local_extrafield,SEEK_SET)!=0) return UNZ_ERRNO;
+
+	if (fread(buf,(uInt)size_to_read,1,pfile_in_zip_read_info->file)!=1) return UNZ_ERRNO;
+
+	return (int)read_now;
+}
+
+/*
+  Close the file in zip opened with unzipOpenCurrentFile
+  Return UNZ_CRCERROR if all the file was read but the CRC is not good
+*/
+extern int ZEXPORT unzCloseCurrentFile (unzFile file) {
+	int err=UNZ_OK;
+
+	unz_s* s;
+	file_in_zip_read_info_s* pfile_in_zip_read_info;
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+    pfile_in_zip_read_info=s->pfile_in_zip_read;
+
+	if (!pfile_in_zip_read_info) return UNZ_PARAMERROR;
+
+
+	if (!pfile_in_zip_read_info->rest_read_uncompressed) {
+		if (pfile_in_zip_read_info->crc32 != pfile_in_zip_read_info->crc32_wait) err=UNZ_CRCERROR;
+	}
+
+
+	TRYFREE(pfile_in_zip_read_info->read_buffer);
+	pfile_in_zip_read_info->read_buffer = NULL;
+	if (pfile_in_zip_read_info->stream_initialised)	inflateEnd(&pfile_in_zip_read_info->stream);
+
+	pfile_in_zip_read_info->stream_initialised = 0;
+	TRYFREE(pfile_in_zip_read_info);
+
+    s->pfile_in_zip_read=NULL;
+
+	return err;
+}
+
+
+/*
+  Get the global comment string of the ZipFile, in the szComment buffer.
+  uSizeBuf is the size of the szComment buffer.
+  return the number of byte copied or an error code <0
+*/
+extern int ZEXPORT unzGetGlobalComment (unzFile file, char *szComment, uLong uSizeBuf) {
+//	int err=UNZ_OK;
+	unz_s* s;
+	uLong uReadThis ;
+	if (!file) return UNZ_PARAMERROR;
+	s=(unz_s*)file;
+
+	uReadThis = uSizeBuf;
+	if (uReadThis>s->gi.size_comment) uReadThis = s->gi.size_comment;
+
+	if (fseek(s->file,s->central_pos+22,SEEK_SET)!=0) return UNZ_ERRNO;
+
+	if (uReadThis>0) {
+      *szComment='\0';
+	  if (fread(szComment,(uInt)uReadThis,1,s->file)!=1) return UNZ_ERRNO;
+    }
+
+	if ((szComment != NULL) && (uSizeBuf > s->gi.size_comment)) *(szComment+s->gi.size_comment)='\0';
+	return (int)uReadThis;
+}

engine/libs/unzip.h

@@ -0,0 +1,279 @@
+/* unzip.h -- IO for uncompress .zip files using zlib 
+   Version 0.15 beta, Mar 19th, 1998,
+
+   Copyright (C) 1998 Gilles Vollant
+
+   This unzip package allow extract file from .ZIP file, compatible with PKZip 2.04g
+     WinZip, InfoZip tools and compatible.
+   Encryption and multi volume ZipFile (span) are not supported.
+   Old compressions used by old PKZip 1.x are not supported
+
+   THIS IS AN ALPHA VERSION. AT THIS STAGE OF DEVELOPPEMENT, SOMES API OR STRUCTURE
+   CAN CHANGE IN FUTURE VERSION !!
+   I WAIT FEEDBACK at mail info@winimage.com
+   Visit also http://www.winimage.com/zLibDll/unzip.htm for evolution
+
+   Condition of use and distribution are the same than zlib :
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+
+*/
+/* for more info about .ZIP format, see 
+      ftp://ftp.cdrom.com/pub/infozip/doc/appnote-970311-iz.zip
+   PkWare has also a specification at :
+      ftp://ftp.pkware.com/probdesc.zip */
+
+#ifndef _unz_H
+#define _unz_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef _ZLIB_H
+#include "zlib.h"
+#endif
+
+#if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP)
+/* like the STRICT of WIN32, we define a pointer that cannot be converted
+    from (void*) without cast */
+typedef struct TagunzFile__ { int unused; } unzFile__; 
+typedef unzFile__ *unzFile;
+#else
+typedef voidp unzFile;
+#endif
+
+
+#define UNZ_OK                                  (0)
+#define UNZ_END_OF_LIST_OF_FILE (-100)
+#define UNZ_ERRNO               (Z_ERRNO)
+#define UNZ_EOF                 (0)
+#define UNZ_PARAMERROR                  (-102)
+#define UNZ_BADZIPFILE                  (-103)
+#define UNZ_INTERNALERROR               (-104)
+#define UNZ_CRCERROR                    (-105)
+
+/* tm_unz contain date/time info */
+//typedef struct tm_unz_s 
+//{
+//	uInt tm_sec;            /* seconds after the minute - [0,59] */
+//	uInt tm_min;            /* minutes after the hour - [0,59] */
+//	uInt tm_hour;           /* hours since midnight - [0,23] */
+//	uInt tm_mday;           /* day of the month - [1,31] */
+//	uInt tm_mon;            /* months since January - [0,11] */
+//	uInt tm_year;           /* years - [1980..2044] */
+//} tm_unz;
+
+/* unz_global_info structure contain global data about the ZIPfile
+   These data comes from the end of central dir */
+typedef struct unz_global_info_s
+{
+	uLong number_entry;         /* total number of entries in
+				       the central dir on this disk */
+	uLong size_comment;         /* size of the global comment of the zipfile */
+} unz_global_info;
+
+
+/* unz_file_info contain information about a file in the zipfile */
+#pragma pack(push, 1)
+typedef struct unz_file_info_s
+{
+    uShort version;              /* version made by                 2 bytes */
+    uShort version_needed;       /* version needed to extract       2 bytes */
+    uShort flag;                 /* general purpose bit flag        2 bytes */
+    uShort compression_method;   /* compression method              2 bytes */
+    uLong dosDate;              /* last mod file date in Dos fmt   4 bytes */
+    uLong crc;                  /* crc-32                          4 bytes */
+    uLong compressed_size;      /* compressed size                 4 bytes */ 
+    uLong uncompressed_size;    /* uncompressed size               4 bytes */ 
+    uShort size_filename;        /* filename length                 2 bytes */
+    uShort size_file_extra;      /* extra field length              2 bytes */
+    uShort size_file_comment;    /* file comment length             2 bytes */
+
+    uShort disk_num_start;       /* disk number start               2 bytes */
+    uShort internal_fa;          /* internal file attributes        2 bytes */
+    uLong external_fa;          /* external file attributes        4 bytes */
+
+//    tm_unz tmu_date;
+	uLong	offset, c_offset;
+} unz_file_info;
+#pragma pack(pop)
+extern int ZEXPORT unzStringFileNameCompare OF ((const char* fileName1,
+												 const char* fileName2,
+												 int iCaseSensitivity));
+/*
+   Compare two filename (fileName1,fileName2).
+   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
+   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
+								or strcasecmp)
+   If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
+	(like 1 on Unix, 2 on Windows)
+*/
+
+
+extern unzFile ZEXPORT unzOpen OF((const char *path));
+/*
+  Open a Zip file. path contain the full pathname (by example,
+     on a Windows NT computer "c:\\zlib\\zlib111.zip" or on an Unix computer
+	 "zlib/zlib111.zip".
+	 If the zipfile cannot be opened (file don't exist or in not valid), the
+	   return value is NULL.
+     Else, the return value is a unzFile Handle, usable with other function
+	   of this unzip package.
+*/
+
+extern int ZEXPORT unzClose OF((unzFile file));
+/*
+  Close a ZipFile opened with unzipOpen.
+  If there is files inside the .Zip opened with unzOpenCurrentFile (see later),
+    these files MUST be closed with unzipCloseCurrentFile before call unzipClose.
+  return UNZ_OK if there is no problem. */
+
+extern int ZEXPORT unzGetGlobalInfo OF((unzFile file,
+					unz_global_info *pglobal_info));
+/*
+  Write info about the ZipFile in the *pglobal_info structure.
+  No preparation of the structure is needed
+  return UNZ_OK if there is no problem. */
+
+
+extern int ZEXPORT unzGetGlobalComment OF((unzFile file,
+										   char *szComment,
+					   uLong uSizeBuf));
+/*
+  Get the global comment string of the ZipFile, in the szComment buffer.
+  uSizeBuf is the size of the szComment buffer.
+  return the number of byte copied or an error code <0
+*/
+
+
+/***************************************************************************/
+/* Unzip package allow you browse the directory of the zipfile */
+
+extern int ZEXPORT unzGoToFirstFile OF((unzFile file));
+/*
+  Set the current file of the zipfile to the first file.
+  return UNZ_OK if there is no problem
+*/
+
+extern int ZEXPORT unzGoToNextFile OF((unzFile file));
+/*
+  Set the current file of the zipfile to the next file.
+  return UNZ_OK if there is no problem
+  return UNZ_END_OF_LIST_OF_FILE if the actual file was the latest.
+*/
+
+extern int ZEXPORT unzLocateFile OF((unzFile file, 
+				     const char *szFileName,
+				     int iCaseSensitivity));
+
+extern int ZEXPORT unzLocateFileMy OF((unzFile file, uLong num, uLong pos));
+/*
+  Try locate the file szFileName in the zipfile.
+  For the iCaseSensitivity signification, see unzStringFileNameCompare
+
+  return value :
+  UNZ_OK if the file is found. It becomes the current file.
+  UNZ_END_OF_LIST_OF_FILE if the file is not found
+*/
+
+
+extern int ZEXPORT unzGetCurrentFileInfo OF((unzFile file,
+					     unz_file_info *pfile_info,
+					     char *szFileName,
+					     uLong fileNameBufferSize,
+					     void *extraField,
+					     uLong extraFieldBufferSize,
+					     char *szComment,
+					     uLong commentBufferSize));
+/*
+  Get Info about the current file
+  if pfile_info!=NULL, the *pfile_info structure will contain somes info about
+	    the current file
+  if szFileName!=NULL, the filemane string will be copied in szFileName
+			(fileNameBufferSize is the size of the buffer)
+  if extraField!=NULL, the extra field information will be copied in extraField
+			(extraFieldBufferSize is the size of the buffer).
+			This is the Central-header version of the extra field
+  if szComment!=NULL, the comment string of the file will be copied in szComment
+			(commentBufferSize is the size of the buffer)
+*/
+
+/***************************************************************************/
+/* for reading the content of the current zipfile, you can open it, read data
+   from it, and close it (you can close it before reading all the file)
+   */
+
+extern int ZEXPORT unzOpenCurrentFile OF((unzFile file));
+/*
+  Open for reading data the current file in the zipfile.
+  If there is no error, the return value is UNZ_OK.
+*/
+
+extern int ZEXPORT unzCloseCurrentFile OF((unzFile file));
+/*
+  Close the file in zip opened with unzOpenCurrentFile
+  Return UNZ_CRCERROR if all the file was read but the CRC is not good
+*/
+
+												
+extern int ZEXPORT unzReadCurrentFile OF((unzFile file, 
+					  voidp buf,
+					  unsigned len));
+/*
+  Read bytes from the current file (opened by unzOpenCurrentFile)
+  buf contain buffer where data must be copied
+  len the size of buf.
+
+  return the number of byte copied if somes bytes are copied
+  return 0 if the end of file was reached
+  return <0 with error code if there is an error
+    (UNZ_ERRNO for IO error, or zLib error for uncompress error)
+*/
+
+extern z_off_t ZEXPORT unztell OF((unzFile file));
+/*
+  Give the current position in uncompressed data
+*/
+
+extern int ZEXPORT unzeof OF((unzFile file));
+/*
+  return 1 if the end of file was reached, 0 elsewhere 
+*/
+
+extern int ZEXPORT unzGetLocalExtrafield OF((unzFile file,
+											 voidp buf,
+											 unsigned len));
+/*
+  Read extra field from the current file (opened by unzOpenCurrentFile)
+  This is the local-header version of the extra field (sometimes, there is
+    more info in the local-header version than in the central-header)
+
+  if buf==NULL, it return the size of the local extra field
+
+  if buf!=NULL, len is the size of the buffer, the extra header is copied in
+	buf.
+  the return value is the number of bytes copied in buf, or (if <0) 
+	the error code
+*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _unz_H */