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HatariWii/src/unzip.c

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/*
Hatari - unzip.c
Support for *.zip files, uses zlib.
This file is originally from the minizip code by Gilles Vollant.
*/
/* unzip.c -- IO on .zip files using zlib
Version 0.15 beta, Mar 19th, 1998,
Read unzip.h for more info
*/
const char Unzip_fileid[] = "Hatari unzip.c : " __DATE__ " " __TIME__;
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <zlib.h>
#if HAVE_STRINGS_H
#include <strings.h>
#endif
#include "unzip.h"
#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
static 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 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 successfully opened for reading.
*/
local int unzlocal_getByte(FILE *fin, int *pi)
{
unsigned char c;
int err = fread(&c, 1, 1, fin);
if (err==1)
{
*pi = (int)c;
return UNZ_OK;
}
else
{
if (ferror(fin))
return UNZ_ERRNO;
else
return UNZ_EOF;
}
}
/* ===========================================================================*/
/**
* Reads a long in LSB order from the given gz_stream. Sets
*/
local int unzlocal_getShort (FILE* fin, uLong *pX)
{
uLong x ;
int i = 0;
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;
}
local int unzlocal_getLong (FILE* fin, uLong *pX)
{
uLong x ;
int i = 0;
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;
}
#ifdef CASESENSITIVITYDEFAULT_NO
#define CASESENSITIVITYDEFAULTVALUE 2
#else
#define CASESENSITIVITYDEFAULTVALUE 1
#endif
/**
* Compare two filename (fileName1,fileName2).
* If iCaseSenisivity = 1, comparison is case sensitivity (like strcmp)
* If iCaseSenisivity = 2, comparison 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)
*
*/
int ZEXPORT unzStringFileNameCompare (const char* fileName1, const char* fileName2, int iCaseSensitivity)
{
if (iCaseSensitivity==0)
iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE;
if (iCaseSensitivity==1)
return strcmp(fileName1, fileName2);
return strcasecmp(fileName1, fileName2);
}
#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==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 (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.
*/
unzFile ZEXPORT unzOpen (const char *path)
{
unz_s us = { 0 };
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;
if (unz_copyright[0]!=' ')
return NULL;
fin=fopen(path,"rb");
if (fin==NULL)
return NULL;
central_pos = unzlocal_SearchCentralDir(fin);
if (central_pos==0)
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.
*/
int ZEXPORT unzClose (unzFile file)
{
unz_s* s;
if (file==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
if (s->pfile_in_zip_read!=NULL)
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.
*/
int ZEXPORT unzGetGlobalInfo (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 (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 (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 (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;
}
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 (fread(szFileName,(uInt)uSizeRead,1,s->file)!=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)
{
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!=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)
{
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!=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.
*/
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
*/
int ZEXPORT unzGoToFirstFile (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.
*/
int ZEXPORT unzGoToNextFile (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
*/
int ZEXPORT unzLocateFile (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 (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;
/*
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.
*/
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==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 +
iSizeVar;
pfile_in_zip_read_info->stream.avail_in = (uInt)0;
s->pfile_in_zip_read = pfile_in_zip_read_info;
return UNZ_OK;
}
/**
* 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)
*/
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==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
pfile_in_zip_read_info=s->pfile_in_zip_read;
if (pfile_in_zip_read_info==NULL)
return UNZ_PARAMERROR;
if (pfile_in_zip_read_info->read_buffer == NULL)
return UNZ_END_OF_LIST_OF_FILE;
if (len==0)
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 == 0)
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;
/*
if ((pfile_in_zip_read_info->rest_read_uncompressed ==
pfile_in_zip_read_info->stream.avail_out) &&
(pfile_in_zip_read_info->rest_read_compressed == 0))
flush = Z_FINISH;
*/
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
*/
#if 0
z_off_t ZEXPORT unztell (unzFile file)
{
unz_s* s;
file_in_zip_read_info_s* pfile_in_zip_read_info;
if (file==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
pfile_in_zip_read_info=s->pfile_in_zip_read;
if (pfile_in_zip_read_info==NULL)
return UNZ_PARAMERROR;
return (z_off_t)pfile_in_zip_read_info->stream.total_out;
}
#endif
/**
* return 1 if the end of file was reached, 0 elsewhere
*/
#if 0
int ZEXPORT unzeof (unzFile file)
{
unz_s* s;
file_in_zip_read_info_s* pfile_in_zip_read_info;
if (file==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
pfile_in_zip_read_info=s->pfile_in_zip_read;
if (pfile_in_zip_read_info==NULL)
return UNZ_PARAMERROR;
if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
return 1;
else
return 0;
}
#endif
/**
* Close the file in zip opened with unzipOpenCurrentFile
* Return UNZ_CRCERROR if all the file was read but the CRC is not good
*/
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==NULL)
return UNZ_PARAMERROR;
s=(unz_s*)file;
pfile_in_zip_read_info=s->pfile_in_zip_read;
if (pfile_in_zip_read_info==NULL)
return UNZ_PARAMERROR;
if (pfile_in_zip_read_info->rest_read_uncompressed == 0)
{
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;
}
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