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unzip.c
1321 lines (1074 loc) · 34.5 KB
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unzip.c
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/* unzip.c -- IO on .zip files using zlib
Version 0.15 beta, Mar 19th, 1998,
Read unzip.h for more info
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "zlib.h"
#include "unzip.h"
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if (!defined PHYSFS_SUPPORTS_ZIP)
#error PHYSFS_SUPPORTS_ZIP must be defined.
#endif
#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
const char unz_copyright[] =
" unzip 0.15 Copyright 1998 Gilles Vollant ";
/* 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 seek*/
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*/
void* 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
{
void* 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_getByte(fin,pi)
void *fin;
int *pi;
{
PHYSFS_uint8 c;
PHYSFS_sint64 err = __PHYSFS_platformRead(fin, &c, 1, 1);
if (err==1)
{
*pi = (int)c;
return UNZ_OK;
}
else
{
if (ferror(fin))
return UNZ_ERRNO;
else
return UNZ_EOF;
}
}
/* !!! FIXME: Use PhysFS byteswap routines. */
/* ===========================================================================
Reads a long in LSB order from the given gz_stream. Sets
*/
local int unzlocal_getShort (fin,pX)
void* fin;
uLong *pX;
{
uLong x ;
int i;
int err;
err = unzlocal_getByte(fin,&i);
x = (uLong)i;
if (err==UNZ_OK)
err = unzlocal_getByte(fin,&i);
x += ((uLong)i)<<8;
if (err==UNZ_OK)
*pX = x;
else
*pX = 0;
return err;
}
/* !!! FIXME: Use PhysFS byteswap routines. */
local int unzlocal_getLong (fin,pX)
void* fin;
uLong *pX;
{
uLong x ;
int i;
int err;
err = unzlocal_getByte(fin,&i);
x = (uLong)i;
if (err==UNZ_OK)
err = unzlocal_getByte(fin,&i);
x += ((uLong)i)<<8;
if (err==UNZ_OK)
err = unzlocal_getByte(fin,&i);
x += ((uLong)i)<<16;
if (err==UNZ_OK)
err = unzlocal_getByte(fin,&i);
x += ((uLong)i)<<24;
if (err==UNZ_OK)
*pX = x;
else
*pX = 0;
return err;
}
/* My own strcmpi / strcasecmp */
local int strcmpcasenosensitive_internal (fileName1,fileName2)
const char* fileName1;
const char* fileName2;
{
for (;;)
{
char c1=*(fileName1++);
char c2=*(fileName2++);
if ((c1>='a') && (c1<='z'))
c1 -= 0x20;
if ((c2>='a') && (c2<='z'))
c2 -= 0x20;
if (c1=='\0')
return ((c2=='\0') ? 0 : -1);
if (c2=='\0')
return 1;
if (c1<c2)
return -1;
if (c1>c2)
return 1;
}
}
#ifdef CASESENSITIVITYDEFAULT_NO
#define CASESENSITIVITYDEFAULTVALUE 2
#else
#define CASESENSITIVITYDEFAULTVALUE 1
#endif
#ifndef STRCMPCASENOSENTIVEFUNCTION
#define STRCMPCASENOSENTIVEFUNCTION strcmpcasenosensitive_internal
#endif
/*
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 int ZEXPORT unzStringFileNameCompare (fileName1,fileName2,iCaseSensitivity)
const char* fileName1;
const char* fileName2;
int iCaseSensitivity;
{
if (iCaseSensitivity==0)
iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE;
if (iCaseSensitivity==1)
return strcmp(fileName1,fileName2);
return STRCMPCASENOSENTIVEFUNCTION(fileName1,fileName2);
}
#define BUFREADCOMMENT (0x400)
/*
Locate the Central directory of a zipfile (at the end, just before
the global comment)
*/
local uLong unzlocal_SearchCentralDir(fin)
void *fin;
{
unsigned char* buf;
uLong uSizeFile;
uLong uBackRead;
uLong uMaxBack=0xffff; /* maximum size of global comment */
uLong uPosFound=0;
uSizeFile = (uLong) __PHYSFS_platformFileLength( fin );
if (uMaxBack>uSizeFile)
uMaxBack = uSizeFile;
buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);
if (buf==NULL)
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 (!__PHYSFS_platformSeek(fin,uReadPos))
break;
if (__PHYSFS_platformRead(fin,buf,(uInt)uReadSize,1)!=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 (path)
const char *path;
{
unz_s us;
unz_s *s;
uLong central_pos,uL;
void* 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;
if (unz_copyright[0]!=' ')
return NULL;
fin=__PHYSFS_platformOpenRead(path);
if (fin==NULL)
return NULL;
central_pos = unzlocal_SearchCentralDir(fin);
if (central_pos==0)
err=UNZ_ERRNO;
if (!__PHYSFS_platformSeek(fin,central_pos))
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)
{
__PHYSFS_platformClose(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 (file)
unzFile file;
{
unz_s* s;
if (file==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
if (s->pfile_in_zip_read!=NULL)
unzCloseCurrentFile(file);
__PHYSFS_platformClose(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 (file,pglobal_info)
unzFile file;
unz_global_info *pglobal_info;
{
unz_s* s;
if (file==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
*pglobal_info=s->gi;
return UNZ_OK;
}
/*
Translate date/time from Dos format to tm_unz (readable more easilty)
*/
local void unzlocal_DosDateToTmuDate (ulDosDate, ptm)
uLong ulDosDate;
tm_unz* ptm;
{
uLong uDate;
uDate = (uLong)(ulDosDate>>16);
ptm->tm_mday = (uInt)(uDate&0x1f) ;
ptm->tm_mon = (uInt)((((uDate)&0x1E0)/0x20)-1) ;
ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ;
ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800);
ptm->tm_min = (uInt) ((ulDosDate&0x7E0)/0x20) ;
ptm->tm_sec = (uInt) (2*(ulDosDate&0x1f)) ;
}
/*
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 (file,
pfile_info,
pfile_info_internal,
szFileName, fileNameBufferSize,
extraField, extraFieldBufferSize,
szComment, commentBufferSize)
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==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
if (!__PHYSFS_platformSeek(s->file,s->pos_in_central_dir+s->byte_before_the_zipfile))
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;
}
if (unzlocal_getShort(s->file,&file_info.version) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getShort(s->file,&file_info.version_needed) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getShort(s->file,&file_info.flag) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getShort(s->file,&file_info.compression_method) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getLong(s->file,&file_info.dosDate) != UNZ_OK)
err=UNZ_ERRNO;
unzlocal_DosDateToTmuDate(file_info.dosDate,&file_info.tmu_date);
if (unzlocal_getLong(s->file,&file_info.crc) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getLong(s->file,&file_info.compressed_size) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getLong(s->file,&file_info.uncompressed_size) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getShort(s->file,&file_info.size_filename) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getShort(s->file,&file_info.size_file_extra) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getShort(s->file,&file_info.size_file_comment) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getShort(s->file,&file_info.disk_num_start) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getShort(s->file,&file_info.internal_fa) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getLong(s->file,&file_info.external_fa) != UNZ_OK)
err=UNZ_ERRNO;
if (unzlocal_getLong(s->file,&file_info_internal.offset_curfile) != UNZ_OK)
err=UNZ_ERRNO;
lSeek+=file_info.size_filename;
if ((err==UNZ_OK) && (szFileName!=NULL))
{
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 (__PHYSFS_platformRead(s->file,szFileName,(uInt)uSizeRead,1)!=1)
err=UNZ_ERRNO;
}
lSeek -= uSizeRead;
}
if ((err==UNZ_OK) && (extraField!=NULL))
{
uLong uSizeRead ;
if (file_info.size_file_extra<extraFieldBufferSize)
uSizeRead = file_info.size_file_extra;
else
uSizeRead = extraFieldBufferSize;
if (lSeek!=0)
{
PHYSFS_sint64 curpos = __PHYSFS_platformTell(s->file);
if ((curpos >= 0) && (__PHYSFS_platformSeek(s->file,lSeek+curpos)))
lSeek=0;
else
err=UNZ_ERRNO;
}
if ((file_info.size_file_extra>0) && (extraFieldBufferSize>0))
{
if (__PHYSFS_platformRead(s->file,extraField,(uInt)uSizeRead,1)!=1)
err=UNZ_ERRNO;
}
lSeek += file_info.size_file_extra - uSizeRead;
}
else
lSeek+=file_info.size_file_extra;
if ((err==UNZ_OK) && (szComment!=NULL))
{
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)
{
PHYSFS_sint64 curpos = __PHYSFS_platformTell(s->file);
if (__PHYSFS_platformSeek(s->file,lSeek+curpos))
lSeek=0;
else
err=UNZ_ERRNO;
}
if ((file_info.size_file_comment>0) && (commentBufferSize>0))
{
if (__PHYSFS_platformRead(s->file,szComment,(uInt)uSizeRead,1)!=1)
err=UNZ_ERRNO;
}
lSeek+=file_info.size_file_comment - uSizeRead;
}
else
lSeek+=file_info.size_file_comment;
if ((err==UNZ_OK) && (pfile_info!=NULL))
*pfile_info=file_info;
if ((err==UNZ_OK) && (pfile_info_internal!=NULL))
*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 (file,
pfile_info,
szFileName, fileNameBufferSize,
extraField, extraFieldBufferSize,
szComment, commentBufferSize)
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 (file)
unzFile file;
{
int err=UNZ_OK;
unz_s* s;
if (file==NULL)
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 (file)
unzFile file;
{
unz_s* s;
int err;
if (file==NULL)
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;
}
/*
Try locate the file szFileName in the zipfile.
For the iCaseSensitivity signification, see unzipStringFileNameCompare
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 unzLocateFile (file, szFileName, iCaseSensitivity)
unzFile file;
const char *szFileName;
int iCaseSensitivity;
{
unz_s* s;
int err;
uLong num_fileSaved;
uLong pos_in_central_dirSaved;
if (file==NULL)
return UNZ_PARAMERROR;
if (strlen(szFileName)>=UNZ_MAXFILENAMEINZIP)
return UNZ_PARAMERROR;
s=(unz_s*)file;
if (!s->current_file_ok)
return UNZ_END_OF_LIST_OF_FILE;
num_fileSaved = s->num_file;
pos_in_central_dirSaved = s->pos_in_central_dir;
err = unzGoToFirstFile(file);
while (err == UNZ_OK)
{
char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
unzGetCurrentFileInfo(file,NULL,
szCurrentFileName,sizeof(szCurrentFileName)-1,
NULL,0,NULL,0);
if (unzStringFileNameCompare(szCurrentFileName,
szFileName,iCaseSensitivity)==0)
return UNZ_OK;
err = unzGoToNextFile(file);
}
s->num_file = num_fileSaved ;
s->pos_in_central_dir = pos_in_central_dirSaved ;
return err;
}
/*
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 (s,piSizeVar,
poffset_local_extrafield,
psize_local_extrafield)
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 (!__PHYSFS_platformSeek(s->file,
s->cur_file_info_internal.offset_curfile +
s->byte_before_the_zipfile))
{
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;
/*
else if ((err==UNZ_OK) && (uData!=s->cur_file_info.wVersion))
err=UNZ_BADZIPFILE;
*/
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;
if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* date/time */
err=UNZ_ERRNO;
if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* crc */
err=UNZ_ERRNO;
else if ((err==UNZ_OK) && (uData!=s->cur_file_info.crc) &&
((uFlags & 8)==0))
err=UNZ_BADZIPFILE;
if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* size compr */
err=UNZ_ERRNO;
else if ((err==UNZ_OK) && (uData!=s->cur_file_info.compressed_size) &&
((uFlags & 8)==0))
err=UNZ_BADZIPFILE;
if (unzlocal_getLong(s->file,&uData) != UNZ_OK) /* size uncompr */
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 (file)
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==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
if (!s->current_file_ok)
return UNZ_PARAMERROR;
if (s->pfile_in_zip_read != NULL)
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==NULL)
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==NULL)
{
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 +