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pgeZip.c
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pgeZip.c
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/*
* This file is part of "Phoenix Game Engine".
*
* Copyright (C) 2008 Phoenix Game Engine
* Copyright (C) 2008 InsertWittyName <tias_dp@hotmail.com>
* Copyright (C) 2008 MK2k <pge@mk2k.net>
*
* Phoenix Game Engine is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* Phoenix Game Engine is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Phoenix Game Engine. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include <sys/stat.h>
#include "pgeZip.h"
#include "pge.h"
#define PGE_ZIP_BUFFER_SIZE (16384)
#define PGE_ZIP_MAX_FILENAME_SIZE (256)
#define PGE_ZIP_CENTRALDIR_ITEM_SIZE (0x2e)
#define PGE_ZIP_LOCALHEADER_SIZE (0x1e)
#define PGE_ZIP_OK (0)
#define PGE_ZIP_EOF_LIST (-100)
#define PGE_ZIP_ERRNO (Z_ERRNO)
#define PGE_ZIP_EOF (0)
#define PGE_ZIP_PARAM_ERROR (-102)
#define PGE_ZIP_BAD_FILE (-103)
#define PGE_ZIP_INTERNAL_ERROR (-104)
#define PGE_ZIP_CRC_ERROR (-105)
#define CRC32(c, b) ((*(crc32tab+(((int)(c) ^ (b)) & 0xff))) ^ ((c) >> 8))
#define zdecode(pkeys, crc32tab, c) (pgeZipUpdateKeys(pkeys, crc32tab, c ^= pgeZipDecryptByte(pkeys, crc32tab)))
#define PGE_ZIP_BUF_READ_COMMENT (0x400)
typedef struct
{
unsigned long version;
unsigned long versionneeded;
unsigned long flag;
unsigned long compressionmethod;
unsigned long dosdate;
unsigned long crc;
unsigned long compressedsize;
unsigned long uncompressedsize;
unsigned long filenamesize;
unsigned long fileextrasize;
unsigned long filecommentsize;
unsigned long disknumstart;
unsigned long internalfileattr;
unsigned long externalfileattr;
} zipFileInfo;
typedef struct
{
unsigned long currentfileoffset;
} zipFileInternalInfo;
typedef struct
{
char *buffer;
z_stream stream;
unsigned long posinzip;
unsigned long streaminitialised;
unsigned long localextrafieldoffset;
unsigned int localextrafieldsize;
unsigned long localextrafieldpos;
unsigned long crc32;
unsigned long crc32wait;
unsigned long restreadcompressed;
unsigned long restreaduncompressed;
FILE* file;
unsigned long compressionmethod;
unsigned long bytebeforezip;
} zipFileInfoInternal;
typedef struct
{
unsigned long countentries;
unsigned long commentsize;
} zipGlobalInfo;
typedef struct
{
FILE* file;
zipGlobalInfo gi;
unsigned long bytebeforezip;
unsigned long numfile;
unsigned long posincentraldir;
unsigned long currentfileok;
unsigned long centralpos;
unsigned long centraldirsize;
unsigned long centraldiroffset;
zipFileInfo currentfileinfo;
zipFileInternalInfo currentfileinfointernal;
zipFileInfoInternal* currentzipfileinfo;
int encrypted;
unsigned long keys[3];
const unsigned long* crc32tab;
} _zip;
static int pgeZipGetByte(FILE *file, int *pi)
{
unsigned char c;
int err = fread(&c, 1, 1, file);
if(err == 1)
{
*pi = (int)c;
return PGE_ZIP_OK;
}
else
{
if(ferror(file))
return PGE_ZIP_ERRNO;
else
return PGE_ZIP_EOF;
}
}
static int pgeZipGetShort(FILE *file, unsigned long *px)
{
unsigned long x;
int i = 0;
int err;
err = pgeZipGetByte(file, &i);
x = (unsigned long)i;
if(err == PGE_ZIP_OK)
err = pgeZipGetByte(file, &i);
x += ((unsigned long)i)<<8;
if(err == PGE_ZIP_OK)
*px = x;
else
*px = 0;
return err;
}
static int pgeZipGetLong(FILE *file, unsigned long *px)
{
unsigned long x;
int i = 0;
int err;
err = pgeZipGetByte(file, &i);
x = (unsigned long)i;
if(err == PGE_ZIP_OK)
err = pgeZipGetByte(file, &i);
x += ((unsigned long)i)<<8;
if(err == PGE_ZIP_OK)
err = pgeZipGetByte(file,&i);
x += ((unsigned long)i)<<16;
if(err == PGE_ZIP_OK)
err = pgeZipGetByte(file,&i);
x += ((unsigned long)i)<<24;
if(err == PGE_ZIP_OK)
*px = x;
else
*px = 0;
return err;
}
static int pgeZipDecryptByte(unsigned long* pkeys, const unsigned long* crc32tab)
{
(void)crc32tab;
unsigned temp;
temp = ((unsigned)(*(pkeys + 2)) & 0xffff) | 2;
return (int)(((temp * (temp ^ 1)) >> 8) & 0xff);
}
static int pgeZipUpdateKeys(unsigned long* pkeys, const unsigned long* crc32tab, int c)
{
(*(pkeys + 0)) = CRC32((*(pkeys + 0)), c);
(*(pkeys + 1)) += (*(pkeys + 0)) & 0xff;
(*(pkeys + 1)) = (*(pkeys + 1)) * 134775813L + 1;
{
register int keyshift = (int)((*(pkeys + 1)) >> 24);
(*(pkeys + 2)) = CRC32((*(pkeys + 2)), keyshift);
}
return c;
}
static void pgeZipInitKeys(const char* passwd, unsigned long* pkeys, const unsigned long* crc32tab)
{
*(pkeys + 0) = 305419896L;
*(pkeys + 1) = 591751049L;
*(pkeys + 2) = 878082192L;
while(*passwd != '\0')
{
pgeZipUpdateKeys(pkeys, crc32tab, (int)*passwd);
passwd++;
}
}
static unsigned long pgeZipLocateCentralDir(FILE *file)
{
unsigned char* buf;
unsigned long usizefile;
unsigned long ubackread;
unsigned long umaxback = 0xffff;
unsigned long uposfound = 0;
if(fseek(file, 0, SEEK_END) != 0)
return 0;
usizefile = ftell(file);
if(umaxback > usizefile)
umaxback = usizefile;
buf = (unsigned char*)pgeMalloc(PGE_ZIP_BUF_READ_COMMENT + 4);
if(buf == NULL)
return 0;
ubackread = 4;
while(ubackread < umaxback)
{
unsigned long ureadsize, ureadpos;
int i;
if(ubackread + PGE_ZIP_BUF_READ_COMMENT > umaxback)
ubackread = umaxback;
else
ubackread += PGE_ZIP_BUF_READ_COMMENT;
ureadpos = usizefile - ubackread;
ureadsize = ((PGE_ZIP_BUF_READ_COMMENT + 4) < (usizefile - ureadpos)) ? (PGE_ZIP_BUF_READ_COMMENT+ 4) : (usizefile - ureadpos);
if(fseek(file, ureadpos, SEEK_SET) != 0)
break;
if(fread(buf, (unsigned int)ureadsize, 1, file) != 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;
}
pgeFree(buf);
return uposfound;
}
static int pgeZipGetZipFileInfoInternal(pgeZip* file, zipFileInfo *pfileinfo, zipFileInternalInfo *pfileinfointernal, char *filename, unsigned long filenamebuffersize, void *extrafield, unsigned long extrafieldbuffersize, char *comment, unsigned long commentbuffersize)
{
_zip* s;
zipFileInfo fileinfo;
zipFileInternalInfo fileinfointernal;
int err = PGE_ZIP_OK;
unsigned long umagic;
long lseek = 0;
if(file == NULL)
return PGE_ZIP_PARAM_ERROR;
s = (_zip*)file;
if(fseek(s->file, s->posincentraldir + s->bytebeforezip, SEEK_SET) != 0)
err = PGE_ZIP_ERRNO;
if(err == PGE_ZIP_OK)
{
if(pgeZipGetLong(s->file, &umagic) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
else if(umagic != 0x02014b50)
err = PGE_ZIP_BAD_FILE;
}
if (pgeZipGetShort(s->file, &fileinfo.version) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetShort(s->file, &fileinfo.versionneeded) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetShort(s->file, &fileinfo.flag) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetShort(s->file, &fileinfo.compressionmethod) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetLong(s->file, &fileinfo.dosdate) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetLong(s->file, &fileinfo.crc) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetLong(s->file, &fileinfo.compressedsize) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetLong(s->file, &fileinfo.uncompressedsize) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetShort(s->file, &fileinfo.filenamesize) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetShort(s->file, &fileinfo.fileextrasize) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetShort(s->file, &fileinfo.filecommentsize) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetShort(s->file, &fileinfo.disknumstart) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetShort(s->file, &fileinfo.internalfileattr) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetLong(s->file, &fileinfo.externalfileattr) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if (pgeZipGetLong(s->file, &fileinfointernal.currentfileoffset) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
lseek += fileinfo.filenamesize;
if((err == PGE_ZIP_OK) && (filename != NULL))
{
unsigned long usizeread;
if(fileinfo.filenamesize < filenamebuffersize)
{
*(filename + fileinfo.filenamesize) = '\0';
usizeread = fileinfo.filenamesize;
}
else
usizeread = filenamebuffersize;
if((fileinfo.filenamesize > 0) && (filenamebuffersize > 0))
{
if(fread(filename, (unsigned int)usizeread, 1, s->file) != 1)
err = PGE_ZIP_ERRNO;
}
lseek -= usizeread;
}
if((err == PGE_ZIP_OK) && (extrafield != NULL))
{
unsigned long usizeread;
if (fileinfo.fileextrasize < extrafieldbuffersize)
usizeread = fileinfo.fileextrasize;
else
usizeread = extrafieldbuffersize;
if(lseek != 0)
{
if(fseek(s->file, lseek, SEEK_CUR) == 0)
lseek = 0;
else
err = PGE_ZIP_ERRNO;
}
if((fileinfo.fileextrasize > 0) && (extrafieldbuffersize > 0))
{
if(fread(extrafield, (unsigned int)usizeread, 1, s->file) != 1)
err = PGE_ZIP_ERRNO;
}
lseek += fileinfo.fileextrasize - usizeread;
}
else
lseek += fileinfo.fileextrasize;
if((err == PGE_ZIP_OK) && (comment != NULL))
{
unsigned long usizeread;
if(fileinfo.filecommentsize < commentbuffersize)
{
*(comment + fileinfo.filecommentsize) = '\0';
usizeread = fileinfo.filecommentsize;
}
else
usizeread = commentbuffersize;
if(lseek != 0)
{
if(fseek(s->file, lseek, SEEK_CUR) == 0)
lseek = 0;
else
err = PGE_ZIP_ERRNO;
}
if((fileinfo.filecommentsize > 0) && (commentbuffersize > 0))
{
if(fread(comment, (unsigned int)usizeread, 1, s->file) != 1)
err = PGE_ZIP_ERRNO;
}
lseek += fileinfo.filecommentsize - usizeread;
}
else
lseek += fileinfo.filecommentsize;
if((err == PGE_ZIP_OK) && (pfileinfo != NULL))
*pfileinfo = fileinfo;
if((err == PGE_ZIP_OK) && (pfileinfointernal != NULL))
*pfileinfointernal = fileinfointernal;
return err;
}
static int pgeZipGetGlobalInfo(pgeZip* file, zipGlobalInfo *zipinfo)
{
_zip* s;
if(file == NULL)
return PGE_ZIP_PARAM_ERROR;
s = (_zip*)file;
*zipinfo = s->gi;
return PGE_ZIP_OK;
}
static int pgeZipGotoFirstFile(pgeZip* file)
{
int err = PGE_ZIP_OK;
_zip* s;
if(file == NULL)
return PGE_ZIP_PARAM_ERROR;
s = (_zip*)file;
s->posincentraldir = s->centraldiroffset;
s->numfile = 0;
err = pgeZipGetZipFileInfoInternal(file, &s->currentfileinfo, &s->currentfileinfointernal, NULL, 0, NULL, 0, NULL, 0);
s->currentfileok = (err == PGE_ZIP_OK);
return err;
}
static int pgeZipCloseCurrentFile(pgeZip* file)
{
int err = PGE_ZIP_OK;
_zip* s;
zipFileInfoInternal *pfileinzipreadinfo;
if(file == NULL)
return PGE_ZIP_PARAM_ERROR;
s = (_zip*)file;
pfileinzipreadinfo = s->currentzipfileinfo;
if(pfileinzipreadinfo == NULL)
return PGE_ZIP_PARAM_ERROR;
if(pfileinzipreadinfo->restreaduncompressed == 0)
{
if(pfileinzipreadinfo->crc32 != pfileinzipreadinfo->crc32wait)
err = PGE_ZIP_CRC_ERROR;
}
pgeFree(pfileinzipreadinfo->buffer);
pfileinzipreadinfo->buffer = NULL;
if(pfileinzipreadinfo->streaminitialised)
inflateEnd(&pfileinzipreadinfo->stream);
pfileinzipreadinfo->streaminitialised = 0;
pgeFree(pfileinzipreadinfo);
s->currentzipfileinfo = NULL;
return err;
}
static int pgeZipGetCurrentFileInfo(pgeZip* file, zipFileInfo *pfileinfo, char *filename, unsigned long filenamebuffersize, void *extrafield, unsigned long extrafieldbuffersize, char *comment, unsigned long commentbuffersize)
{
return pgeZipGetZipFileInfoInternal(file, pfileinfo, NULL, filename, filenamebuffersize, extrafield, extrafieldbuffersize, comment, commentbuffersize);
}
static int pgeZipGotoNextFile(pgeZip* file)
{
_zip* s;
int err;
if(file == NULL)
return PGE_ZIP_PARAM_ERROR;
s = (_zip*)file;
if(!s->currentfileok)
return PGE_ZIP_EOF_LIST;
if(s->numfile + 1 == s->gi.countentries)
return PGE_ZIP_EOF_LIST;
s->posincentraldir += PGE_ZIP_CENTRALDIR_ITEM_SIZE + s->currentfileinfo.filenamesize + s->currentfileinfo.fileextrasize + s->currentfileinfo.filecommentsize ;
s->numfile++;
err = pgeZipGetZipFileInfoInternal(file, &s->currentfileinfo, &s->currentfileinfointernal, NULL, 0, NULL, 0, NULL, 0);
s->currentfileok = (err == PGE_ZIP_OK);
return err;
}
static int pgeZipLocateFile(pgeZip* file, const char *filename, int casesensitive)
{
(void)casesensitive;
_zip* s;
int err;
unsigned long numfilesaved;
unsigned long posincentraldirsaved;
if(file == NULL)
return PGE_ZIP_PARAM_ERROR;
if(strlen(filename) >= PGE_ZIP_MAX_FILENAME_SIZE)
return PGE_ZIP_PARAM_ERROR;
s = (_zip*)file;
if(!s->currentfileok)
return PGE_ZIP_EOF_LIST;
numfilesaved = s->numfile;
posincentraldirsaved = s->posincentraldir;
err = pgeZipGotoFirstFile(file);
char currentfilename[PGE_ZIP_MAX_FILENAME_SIZE + 1];
while(err == PGE_ZIP_OK)
{
pgeZipGetCurrentFileInfo(file,NULL, currentfilename, sizeof(currentfilename) - 1, NULL, 0, NULL, 0);
if(strcmp(currentfilename, filename) == 0)
return PGE_ZIP_OK;
err = pgeZipGotoNextFile(file);
}
s->numfile = numfilesaved;
s->posincentraldir = posincentraldirsaved;
return err;
}
static int pgeZipCheckCurrentFileCoherencyHeader(_zip *s, unsigned int *pisizevar, unsigned long *poffsetstaticextrafield, unsigned int *psizestaticextrafield)
{
unsigned long umagic, udata, uflags;
unsigned long filenamesize;
unsigned long sizeextrafield;
int err = PGE_ZIP_OK;
*pisizevar = 0;
*poffsetstaticextrafield = 0;
*psizestaticextrafield = 0;
if(fseek(s->file, s->currentfileinfointernal.currentfileoffset + s->bytebeforezip, SEEK_SET) != 0)
return PGE_ZIP_ERRNO;
if(err == PGE_ZIP_OK)
{
if(pgeZipGetLong(s->file, &umagic) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
else if(umagic != 0x04034b50)
err = PGE_ZIP_BAD_FILE;
}
if(pgeZipGetShort(s->file, &udata) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetShort(s->file, &uflags) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetShort(s->file, &udata) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
else if((err == PGE_ZIP_OK) && (udata != s->currentfileinfo.compressionmethod))
err = PGE_ZIP_BAD_FILE;
if((err == PGE_ZIP_OK) && (s->currentfileinfo.compressionmethod != 0) && (s->currentfileinfo.compressionmethod != Z_DEFLATED))
err = PGE_ZIP_BAD_FILE;
if(pgeZipGetLong(s->file, &udata) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetLong(s->file, &udata) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
else if((err == PGE_ZIP_OK) && (udata != s->currentfileinfo.crc) && ((uflags & 8) == 0))
err = PGE_ZIP_BAD_FILE;
if(pgeZipGetLong(s->file, &udata) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
else if((err == PGE_ZIP_OK) && (udata != s->currentfileinfo.compressedsize) && ((uflags & 8) == 0))
err = PGE_ZIP_BAD_FILE;
if(pgeZipGetLong(s->file, &udata) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
else if((err == PGE_ZIP_OK) && (udata != s->currentfileinfo.uncompressedsize) && ((uflags & 8) == 0))
err = PGE_ZIP_BAD_FILE;
if(pgeZipGetShort(s->file, &filenamesize) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
else if((err==PGE_ZIP_OK) && (filenamesize != s->currentfileinfo.filenamesize))
err = PGE_ZIP_BAD_FILE;
*pisizevar += (unsigned int)filenamesize;
if(pgeZipGetShort(s->file, &sizeextrafield) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
*poffsetstaticextrafield = s->currentfileinfointernal.currentfileoffset + PGE_ZIP_LOCALHEADER_SIZE + filenamesize;
*psizestaticextrafield = (unsigned int)sizeextrafield;
*pisizevar += (unsigned int)sizeextrafield;
return err;
}
static int pgeZipOpenCurrentFile(pgeZip* file, const char *password)
{
int err = PGE_ZIP_OK;
int store;
unsigned int isizevar;
_zip* s;
zipFileInfoInternal* pfileinzipreadinfo;
unsigned long localextrafieldoffset;
unsigned int localextrafieldsize;
char source[12];
if(file == NULL)
return PGE_ZIP_PARAM_ERROR;
s = (_zip*)file;
if(!s->currentfileok)
return PGE_ZIP_PARAM_ERROR;
if(s->currentzipfileinfo != NULL)
pgeZipCloseCurrentFile(file);
if(pgeZipCheckCurrentFileCoherencyHeader(s, &isizevar, &localextrafieldoffset, &localextrafieldsize) != PGE_ZIP_OK)
return PGE_ZIP_BAD_FILE;
pfileinzipreadinfo = (zipFileInfoInternal*) pgeMalloc(sizeof(zipFileInfoInternal));
if(pfileinzipreadinfo == NULL)
return PGE_ZIP_INTERNAL_ERROR;
pfileinzipreadinfo->buffer = (char*)pgeMalloc(PGE_ZIP_BUFFER_SIZE);
pfileinzipreadinfo->localextrafieldoffset = localextrafieldoffset;
pfileinzipreadinfo->localextrafieldsize = localextrafieldsize;
pfileinzipreadinfo->localextrafieldpos = 0;
if(pfileinzipreadinfo->buffer == NULL)
{
pgeFree(pfileinzipreadinfo);
return PGE_ZIP_INTERNAL_ERROR;
}
pfileinzipreadinfo->streaminitialised = 0;
if((s->currentfileinfo.compressionmethod != 0) && (s->currentfileinfo.compressionmethod != Z_DEFLATED))
err = PGE_ZIP_BAD_FILE;
store = s->currentfileinfo.compressionmethod == 0;
pfileinzipreadinfo->crc32wait = s->currentfileinfo.crc;
pfileinzipreadinfo->crc32 = 0;
pfileinzipreadinfo->compressionmethod = s->currentfileinfo.compressionmethod;
pfileinzipreadinfo->file = s->file;
pfileinzipreadinfo->bytebeforezip = s->bytebeforezip;
pfileinzipreadinfo->stream.total_out = 0;
if(!store)
{
pfileinzipreadinfo->stream.zalloc = (alloc_func)0;
pfileinzipreadinfo->stream.zfree = (free_func)0;
pfileinzipreadinfo->stream.opaque = (voidpf)0;
err = inflateInit2(&pfileinzipreadinfo->stream, -MAX_WBITS);
if(err == Z_OK)
pfileinzipreadinfo->streaminitialised = 1;
}
pfileinzipreadinfo->restreadcompressed = s->currentfileinfo.compressedsize;
pfileinzipreadinfo->restreaduncompressed = s->currentfileinfo.uncompressedsize;
pfileinzipreadinfo->posinzip = s->currentfileinfointernal.currentfileoffset + PGE_ZIP_LOCALHEADER_SIZE + isizevar;
pfileinzipreadinfo->stream.avail_in = (unsigned int)0;
s->currentzipfileinfo = pfileinzipreadinfo;
if(password != NULL)
{
int i;
s->crc32tab = get_crc_table();
pgeZipInitKeys(password, s->keys, s->crc32tab);
if(fseek(pfileinzipreadinfo->file, s->currentzipfileinfo->posinzip + s->currentzipfileinfo->bytebeforezip, SEEK_SET) != 0)
{
pgeFree(pfileinzipreadinfo->buffer);
pgeFree(pfileinzipreadinfo);
return PGE_ZIP_INTERNAL_ERROR;
}
if(fread(source, 1, 12, pfileinzipreadinfo->file) < 12)
{
pgeFree(pfileinzipreadinfo->buffer);
pgeFree(pfileinzipreadinfo);
return PGE_ZIP_INTERNAL_ERROR;
}
for(i = 0; i < 12; i++)
zdecode(s->keys, s->crc32tab, source[i]);
s->currentzipfileinfo->posinzip += 12;
s->encrypted = 1;
}
return PGE_ZIP_OK;
}
static int pgeZipReadCurrentFile(pgeZip* file, void* buf, unsigned int len)
{
int err = PGE_ZIP_OK;
unsigned int iread = 0;
_zip* s;
zipFileInfoInternal* pfileinzipreadinfo;
if(file == NULL)
return PGE_ZIP_PARAM_ERROR;
s = (_zip*)file;
pfileinzipreadinfo = s->currentzipfileinfo;
if(pfileinzipreadinfo == NULL)
return PGE_ZIP_PARAM_ERROR;
if((pfileinzipreadinfo->buffer == NULL))
return PGE_ZIP_EOF_LIST;
if(len == 0)
return 0;
pfileinzipreadinfo->stream.next_out = (Bytef*)buf;
pfileinzipreadinfo->stream.avail_out = (unsigned int)len;
if(len > pfileinzipreadinfo->restreaduncompressed)
pfileinzipreadinfo->stream.avail_out = (unsigned int)pfileinzipreadinfo->restreaduncompressed;
while(pfileinzipreadinfo->stream.avail_out > 0)
{
if((pfileinzipreadinfo->stream.avail_in == 0) && (pfileinzipreadinfo->restreadcompressed > 0))
{
unsigned int ureadthis = PGE_ZIP_BUFFER_SIZE;
if(pfileinzipreadinfo->restreadcompressed < ureadthis)
ureadthis = (unsigned int)pfileinzipreadinfo->restreadcompressed;
if(ureadthis == 0)
return PGE_ZIP_EOF;
if(fseek(pfileinzipreadinfo->file, pfileinzipreadinfo->posinzip + pfileinzipreadinfo->bytebeforezip, SEEK_SET) != 0)
return PGE_ZIP_ERRNO;
if(fread(pfileinzipreadinfo->buffer, ureadthis, 1, pfileinzipreadinfo->file) != 1)
return PGE_ZIP_ERRNO;
if(s->encrypted)
{
unsigned int i;
for(i = 0;i < ureadthis;i++)
pfileinzipreadinfo->buffer[i] = zdecode(s->keys, s->crc32tab, pfileinzipreadinfo->buffer[i]);
}
pfileinzipreadinfo->posinzip += ureadthis;
pfileinzipreadinfo->restreadcompressed -= ureadthis;
pfileinzipreadinfo->stream.next_in = (Bytef*)pfileinzipreadinfo->buffer;
pfileinzipreadinfo->stream.avail_in = (unsigned int)ureadthis;
}
if(pfileinzipreadinfo->compressionmethod == 0)
{
unsigned int udocopy, i;
if((pfileinzipreadinfo->stream.avail_in == 0) && (pfileinzipreadinfo->restreadcompressed == 0))
return (iread == 0) ? PGE_ZIP_EOF : iread;
if(pfileinzipreadinfo->stream.avail_out < pfileinzipreadinfo->stream.avail_in)
udocopy = pfileinzipreadinfo->stream.avail_out;
else
udocopy = pfileinzipreadinfo->stream.avail_in;
for(i = 0;i < udocopy; i++)
*(pfileinzipreadinfo->stream.next_out + i) = *(pfileinzipreadinfo->stream.next_in + i);
pfileinzipreadinfo->crc32 = crc32(pfileinzipreadinfo->crc32, pfileinzipreadinfo->stream.next_out, udocopy);
pfileinzipreadinfo->restreaduncompressed -= udocopy;
pfileinzipreadinfo->stream.avail_in -= udocopy;
pfileinzipreadinfo->stream.avail_out -= udocopy;
pfileinzipreadinfo->stream.next_out += udocopy;
pfileinzipreadinfo->stream.next_in += udocopy;
pfileinzipreadinfo->stream.total_out += udocopy;
iread += udocopy;
}
else
{
unsigned long utotaloutbefore, utotaloutafter;
const Bytef *bufbefore;
unsigned long uoutthis;
int flush = Z_SYNC_FLUSH;
utotaloutbefore = pfileinzipreadinfo->stream.total_out;
bufbefore = pfileinzipreadinfo->stream.next_out;
err = inflate(&pfileinzipreadinfo->stream, flush);
utotaloutafter = pfileinzipreadinfo->stream.total_out;
uoutthis = utotaloutafter - utotaloutbefore;
pfileinzipreadinfo->crc32 = crc32(pfileinzipreadinfo->crc32, bufbefore, (unsigned int)(uoutthis));
pfileinzipreadinfo->restreaduncompressed -= uoutthis;
iread += (unsigned int)(utotaloutafter - utotaloutbefore);
if(err == Z_STREAM_END)
return (iread == 0) ? PGE_ZIP_EOF : iread;
if(err != Z_OK)
break;
}
}
if(err == Z_OK)
return iread;
return err;
}
pgeZip* pgeZipOpen(const char *filename)
{
//printf("Opening zip\n");
_zip us;
_zip *s;
unsigned long centralpos, ul;
FILE *file;
unsigned long numberdisk;
unsigned long numberdiskwithCD;
unsigned long numberentryCD;
int err = PGE_ZIP_OK;
file = fopen(filename, "rb");
if(file == NULL)
return NULL;
centralpos = pgeZipLocateCentralDir(file);
if(centralpos == 0)
err = PGE_ZIP_ERRNO;
if(fseek(file, centralpos, SEEK_SET) != 0)
err = PGE_ZIP_ERRNO;
if(pgeZipGetLong(file, &ul) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetShort(file, &numberdisk) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetShort(file, &numberdiskwithCD) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetShort(file, &us.gi.countentries) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetShort(file, &numberentryCD) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if((numberentryCD != us.gi.countentries) || (numberdiskwithCD != 0) || (numberdisk != 0))
err = PGE_ZIP_BAD_FILE;
if(pgeZipGetLong(file, &us.centraldirsize) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetLong(file, &us.centraldiroffset) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if(pgeZipGetShort(file, &us.gi.commentsize) != PGE_ZIP_OK)
err = PGE_ZIP_ERRNO;
if((centralpos < us.centraldiroffset + us.centraldirsize) && (err == PGE_ZIP_OK))
err = PGE_ZIP_BAD_FILE;
if(err != PGE_ZIP_OK)
{
fclose(file);
return NULL;
}
us.file = file;
us.bytebeforezip = centralpos - (us.centraldiroffset + us.centraldirsize);
us.centralpos = centralpos;
us.currentzipfileinfo = NULL;
us.encrypted = 0;
s = (_zip*)pgeMalloc(sizeof(_zip));
*s = us;
pgeZipGotoFirstFile((pgeZip*)s);
return(pgeZip*)s;
}
int pgeZipClose(pgeZip* zip)
{
_zip* s;
if(zip == NULL)
return 0;
s = (_zip*)zip;
if(s->currentzipfileinfo != NULL)
pgeZipCloseCurrentFile(zip);
//printf("Fclose: %d\n", fclose(s->file));
pgeFree(s);
return 1;
}