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|
/*
This file is part of libextractor.
Copyright (C) 2004, 2008, 2012 Vidyut Samanta and Christian Grothoff
libextractor 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, or (at your
option) any later version.
libextractor 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 libextractor; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file common/unzip.c
* @brief API to access ZIP archives
* @author Christian Grothoff
*
* This code is based in part on
* unzip 1.00 Copyright 1998-2003 Gilles Vollant
* http://www.winimage.com/zLibDll"
*
*
* The filenames for each file in a zipfile are stored in two locations.
* There is one at the start of each entry, just before the compressed data,
* and another at the end in a 'central directory structure'.
*
* In order to catch self-extracting executables, we scan backwards from the end
* of the file looking for the central directory structure. The previous version
* of this went forewards through the local headers, but that only works for plain
* vanilla zip's and I don't feel like writing a special case for each of the dozen
* self-extracting executable stubs.
*
* This assumes that the zip file is considered to be non-corrupt/non-truncated.
* If it is truncated then it's not considered to be a zip and skipped.
*
* ZIP format description from appnote.iz and appnote.txt (more or less):
*
* (this is why you always need to put in the last floppy if you span disks)
*
* 0- 3 end of central dir signature 4 bytes (0x06054b50) P K ^E ^F
* 4- 5 number of this disk 2 bytes
* 6- 7 number of the disk with the
* start of the central directory 2 bytes
* 8- 9 total number of entries in
* the central dir on this disk 2 bytes
* 10-11 total number of entries in
* the central dir 2 bytes
* 12-15 size of the central directory 4 bytes
* 16-19 offset of start of central
* directory with respect to
* the starting disk number 4 bytes
* 20-21 zipfile comment length 2 bytes
* 22-?? zipfile comment (variable size) max length 65536 bytes
*/
#include "platform.h"
#include <ctype.h>
#include "extractor.h"
#include "unzip.h"
#define CASESENSITIVITY (0)
#define MAXFILENAME (256)
#ifndef UNZ_BUFSIZE
#define UNZ_BUFSIZE (16384)
#endif
#ifndef UNZ_MAXFILENAMEINZIP
#define UNZ_MAXFILENAMEINZIP (256)
#endif
#define SIZECENTRALDIRITEM (0x2e)
#define SIZEZIPLOCALHEADER (0x1e)
/**
* IO callbacks for access to the ZIP data.
*/
struct FileFuncDefs
{
/**
* Callback for reading 'size' bytes from the ZIP archive into buf.
*/
uLong (*zread_file) (voidpf opaque, void*buf, uLong size);
/**
* Callback to obtain the current read offset in the ZIP archive.
*/
long (*ztell_file) (voidpf opaque);
/**
* Callback for seeking to a different position in the ZIP archive.
*/
long (*zseek_file) (voidpf opaque, uLong offset, int origin);
/**
* Opaque argument to pass to all IO functions.
*/
voidpf opaque;
};
/**
* Macro to read using filefunc API.
*
* @param filefunc filefunc struct
* @param buf where to write data
* @param size number of bytes to read
* @return number of bytes copied to buf
*/
#define ZREAD(filefunc,buf,size) ((*((filefunc).zread_file))((filefunc).opaque, \
buf, size))
/**
* Macro to obtain current offset in file using filefunc API.
*
* @param filefunc filefunc struct
* @return current offset in file
*/
#define ZTELL(filefunc) ((*((filefunc).ztell_file))((filefunc).opaque))
/**
* Macro to seek using filefunc API.
*
* @param filefunc filefunc struct
* @param pos position to seek
* @param mode seek mode
* @return 0 on success
*/
#define ZSEEK(filefunc,pos,mode) ((*((filefunc).zseek_file))((filefunc).opaque, \
pos, mode))
/**
* Global data about the ZIPfile
* These data comes from the end of central dir
*/
struct GlobalInfo
{
/**
* total number of entries in
* the central dir on this disk
*/
uLong number_entry;
/**
* size of the global comment of the zipfile
*/
uLong size_comment;
/**
* offset of the global comment in the zipfile
*/
uLong offset_comment;
};
/**
* internal info about a file in zipfile
*/
struct UnzipFileInfoInternal
{
/**
* relative offset of local header 4 bytes
*/
uLong offset_curfile;
};
/**
* Information about a file in zipfile, when reading and
* decompressing it
*/
struct FileInZipReadInfo
{
/**
* internal buffer for compressed data
*/
char *read_buffer;
/**
* zLib stream structure for inflate
*/
z_stream stream;
/**
* position in byte on the zipfile, for fseek
*/
uLong pos_in_zipfile;
/**
* flag set if stream structure is initialised
*/
uLong stream_initialised;
/**
* offset of the local extra field
*/
uLong offset_local_extrafield;
/**
* size of the local extra field
*/
uInt size_local_extrafield;
/**
* position in the local extra field in read
*/
uLong pos_local_extrafield;
/**
* crc32 of all data uncompressed so far
*/
uLong crc32;
/**
* crc32 we must obtain after decompress all
*/
uLong crc32_wait;
/**
* number of bytes to be decompressed
*/
uLong rest_read_compressed;
/**
* number of bytes to be obtained after decomp
*/
uLong rest_read_uncompressed;
/**
* IO functions.
*/
struct FileFuncDefs z_filefunc;
/**
* compression method (0==store)
*/
uLong compression_method;
/**
* byte before the zipfile, (>0 for sfx)
*/
uLong byte_before_the_zipfile;
};
/**
* Handle for a ZIP archive.
* contains internal information about the zipfile
*/
struct EXTRACTOR_UnzipFile
{
/**
* io structore of the zipfile
*/
struct FileFuncDefs z_filefunc;
/**
* public global information
*/
struct GlobalInfo gi;
/**
* byte before the zipfile, (>0 for sfx)
*/
uLong byte_before_the_zipfile;
/**
* number of the current file in the zipfile
*/
uLong num_file;
/**
* pos of the current file in the central dir
*/
uLong pos_in_central_dir;
/**
* flag about the usability of the current file
*/
uLong current_file_ok;
/**
* position of the beginning of the central dir
*/
uLong central_pos;
/**
* size of the central directory
*/
uLong size_central_dir;
/**
* offset of start of central directory with respect to the starting
* disk number
*/
uLong offset_central_dir;
/**
* public info about the current file in zip
*/
struct EXTRACTOR_UnzipFileInfo cur_file_info;
/**
* private info about it
*/
struct UnzipFileInfoInternal cur_file_info_internal;
/**
* structure about the current file if we are decompressing it
*/
struct FileInZipReadInfo *pfile_in_zip_read;
/**
* Is the file encrypted?
*/
int encrypted;
};
/**
* 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.
*
* @param ffd functions for performing IO operations
* @param pi where to store the byte that was read
* @return #EXTRACTOR_UNZIP_OK on success, or #EXTRACTOR_UNZIP_EOF
*/
static int
read_byte_from_ffd (const struct FileFuncDefs *ffd,
int *pi)
{
unsigned char c;
if (1 != ZREAD (*ffd, &c, 1))
return EXTRACTOR_UNZIP_EOF;
*pi = (int) c;
return EXTRACTOR_UNZIP_OK;
}
/**
* Read a short (2 bytes) 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.
*
* @param ffd functions for performing IO operations
* @param pi where to store the short that was read
* @return #EXTRACTOR_UNZIP_OK on success, or #EXTRACTOR_UNZIP_EOF
*/
static int
read_short_from_ffd (const struct FileFuncDefs *ffd,
uLong *pX)
{
uLong x;
int i;
int err;
*pX = 0;
if (EXTRACTOR_UNZIP_OK != (err = read_byte_from_ffd (ffd, &i)))
return err;
x = (uLong) i;
if (EXTRACTOR_UNZIP_OK != (err = read_byte_from_ffd (ffd, &i)))
return err;
x += ((uLong) i) << 8;
*pX = x;
return err;
}
/**
* Read a 'long' (4 bytes) 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.
*
* @param ffd functions for performing IO operations
* @param pi where to store the long that was read
* @return #EXTRACTOR_UNZIP_OK on success, or #EXTRACTOR_UNZIP_EOF
*/
static int
read_long_from_ffd (const struct FileFuncDefs *ffd,
uLong *pX)
{
uLong x;
int i;
int err;
*pX = 0;
if (EXTRACTOR_UNZIP_OK != (err = read_byte_from_ffd (ffd, &i)))
return err;
x = (uLong) i;
if (EXTRACTOR_UNZIP_OK != (err = read_byte_from_ffd (ffd, &i)))
return err;
x += ((uLong) i) << 8;
if (EXTRACTOR_UNZIP_OK != (err = read_byte_from_ffd (ffd, &i)))
return err;
x += ((uLong) i) << 16;
if (EXTRACTOR_UNZIP_OK != (err = read_byte_from_ffd (ffd, &i)))
return err;
x += ((uLong) i) << 24;
*pX = x;
return err;
}
#ifndef CASESENSITIVITYDEFAULT_NO
#if ! defined(unix) && ! defined(CASESENSITIVITYDEFAULT_YES)
#define CASESENSITIVITYDEFAULT_NO
#endif
#endif
#ifdef CASESENSITIVITYDEFAULT_NO
#define CASESENSITIVITYDEFAULTVALUE 2
#else
#define CASESENSITIVITYDEFAULTVALUE 1
#endif
/**
* Compare two filenames (fileName1, fileName2).
*
* @param filename1 name of first file
* @param filename2 name of second file
* @param iCaseSensitivity, use 1 for case sensitivity (like strcmp);
* 2 for no case sensitivity (like strcmpi or strcasecmp); or
* 0 for default of your operating system (like 1 on Unix, 2 on Windows)
* @return 0 if names are equal
*/
static int
EXTRACTOR_common_unzip_string_file_name_compare (const char*fileName1,
const char*fileName2,
int iCaseSensitivity)
{
if (0 == iCaseSensitivity)
iCaseSensitivity = CASESENSITIVITYDEFAULTVALUE;
if (1 == iCaseSensitivity)
return strcmp (fileName1, fileName2);
return strcasecmp (fileName1, fileName2);
}
#ifndef BUFREADCOMMENT
#define BUFREADCOMMENT (0x400)
#endif
/**
* Locate the central directory in the ZIP file.
*
* @param ffd IO functions
* @return offset of central directory, 0 on error
*/
static uLong
locate_central_directory (const struct FileFuncDefs *ffd)
{
unsigned char buf[BUFREADCOMMENT + 4];
uLong uSizeFile;
uLong uBackRead;
uLong uMaxBack = 0xffff; /* maximum size of global comment */
if (0 != ZSEEK (*ffd, 0, SEEK_END))
return 0;
uSizeFile = ZTELL (*ffd);
if (uMaxBack > uSizeFile)
uMaxBack = uSizeFile;
uBackRead = 4;
while (uBackRead < uMaxBack)
{
uLong uReadSize;
uLong 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 (0 != ZSEEK (*ffd, uReadPos, SEEK_SET))
break;
if (ZREAD (*ffd, buf, uReadSize) != uReadSize)
break;
i = (int) uReadSize - 3;
while (i-- > 0)
if ( (0x50 == (*(buf + i))) &&
(0x4b == (*(buf + i + 1))) &&
(0x05 == (*(buf + i + 2))) &&
(0x06 == (*(buf + i + 3))) )
return uReadPos + i;
}
return 0;
}
/**
* Translate date/time from Dos format to `struct
* EXTRACTOR_UnzipDateTimeInfo` (readable more easilty)
*
* @param ulDosDate time in DOS format (input)
* @param ptm where to write time in readable format
*/
static void
dos_date_to_tmu_date (uLong ulDosDate,
struct EXTRACTOR_UnzipDateTimeInfo*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));
}
/**
* Write info about the ZipFile in the *pglobal_info structure.
* No preparation of the structure is needed.
*
* @param file zipfile to manipulate
* @param pfile_info file information to initialize
* @param pfile_info_internal internal file information to initialize
* @param szFileName where to write the name of the current file
* @param fileNameBufferSize number of bytes available in @a szFileName
* @param extraField where to write extra data
* @param extraFieldBufferSize number of bytes available in extraField
* @param szComment where to write the comment on the current file
* @param commentBufferSize number of bytes available in @a szComment
* @return #EXTRACTOR_UNZIP_OK if there is no problem.
*/
static int
get_current_file_info (struct EXTRACTOR_UnzipFile *file,
struct EXTRACTOR_UnzipFileInfo *pfile_info,
struct UnzipFileInfoInternal *pfile_info_internal,
char *szFileName,
uLong fileNameBufferSize,
void *extraField,
uLong extraFieldBufferSize,
char *szComment,
uLong commentBufferSize)
{
struct EXTRACTOR_UnzipFileInfo file_info;
struct UnzipFileInfoInternal file_info_internal;
uLong uMagic;
long lSeek = 0;
if (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
if (0 != ZSEEK (file->z_filefunc,
file->pos_in_central_dir + file->byte_before_the_zipfile,
SEEK_SET))
return EXTRACTOR_UNZIP_ERRNO;
/* we check the magic */
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &uMagic))
return EXTRACTOR_UNZIP_ERRNO;
if (0x02014b50 != uMagic)
return EXTRACTOR_UNZIP_BADZIPFILE;
if ( (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &file_info.version)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &file_info.version_needed)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &file_info.flag)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc,
&file_info.compression_method)) ||
(EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &file_info.dosDate)) )
return EXTRACTOR_UNZIP_ERRNO;
dos_date_to_tmu_date (file_info.dosDate,
&file_info.tmu_date);
if ( (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &file_info.crc)) ||
(EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &file_info.compressed_size)) ||
(EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &file_info.uncompressed_size)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &file_info.size_filename)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &file_info.size_file_extra)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc,
&file_info.size_file_comment)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &file_info.disk_num_start)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &file_info.internal_fa)) ||
(EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &file_info.external_fa)) ||
(EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc,
&file_info_internal.offset_curfile)) )
return EXTRACTOR_UNZIP_ERRNO;
lSeek += file_info.size_filename;
if (NULL != 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 (ZREAD (file->z_filefunc, szFileName, uSizeRead) != uSizeRead)
return EXTRACTOR_UNZIP_ERRNO;
lSeek -= uSizeRead;
}
if (NULL != extraField)
{
uLong uSizeRead;
if (file_info.size_file_extra<extraFieldBufferSize)
uSizeRead = file_info.size_file_extra;
else
uSizeRead = extraFieldBufferSize;
if (0 != lSeek)
{
if (0 == ZSEEK (file->z_filefunc, lSeek, SEEK_CUR))
lSeek = 0;
else
return EXTRACTOR_UNZIP_ERRNO;
}
if ( (file_info.size_file_extra > 0) &&
(extraFieldBufferSize > 0) &&
(ZREAD (file->z_filefunc,
extraField,
uSizeRead) != uSizeRead) )
return EXTRACTOR_UNZIP_ERRNO;
lSeek += file_info.size_file_extra - uSizeRead;
}
else
lSeek += file_info.size_file_extra;
if (NULL != szComment)
{
uLong uSizeRead;
if (file_info.size_file_comment < commentBufferSize)
{
*(szComment + file_info.size_file_comment) = '\0';
uSizeRead = file_info.size_file_comment;
}
else
{
*(szComment + commentBufferSize - 1) = '\0';
uSizeRead = commentBufferSize - 1;
}
if (0 != lSeek)
{
if (0 == ZSEEK (file->z_filefunc, lSeek, SEEK_CUR))
lSeek = 0;
else
return EXTRACTOR_UNZIP_ERRNO;
}
if ( (file_info.size_file_comment > 0) &&
(commentBufferSize > 0) &&
(ZREAD (file->z_filefunc, szComment, uSizeRead) != uSizeRead) )
return EXTRACTOR_UNZIP_ERRNO;
lSeek += file_info.size_file_comment - uSizeRead;
}
else
lSeek += file_info.size_file_comment;
if (NULL != pfile_info)
*pfile_info = file_info;
if (NULL != pfile_info_internal)
*pfile_info_internal = file_info_internal;
return EXTRACTOR_UNZIP_OK;
}
/**
* Set the current file of the zipfile to the first file.
*
* @param file zipfile to manipulate
* @return UNZ_OK if there is no problem
*/
int
EXTRACTOR_common_unzip_go_to_first_file (struct EXTRACTOR_UnzipFile *file)
{
int err;
if (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
file->pos_in_central_dir = file->offset_central_dir;
file->num_file = 0;
err = get_current_file_info (file,
&file->cur_file_info,
&file->cur_file_info_internal,
NULL, 0, NULL, 0, NULL, 0);
file->current_file_ok = (EXTRACTOR_UNZIP_OK == err);
return err;
}
/**
* Open a Zip file.
*
* @param ffd IO functions
* @return NULL on error
*/
static struct EXTRACTOR_UnzipFile *
unzip_open_using_ffd (struct FileFuncDefs *ffd)
{
struct EXTRACTOR_UnzipFile us;
struct EXTRACTOR_UnzipFile *file;
uLong central_pos;
uLong uL;
uLong number_disk; /* number of the current dist, used for
spanning ZIP, unsupported, always 0*/
uLong number_disk_with_CD; /* number of the disk with central dir, used
for spanning ZIP, unsupported, always 0*/
uLong number_entry_CD; /* total number of entries in
the central dir
(same than number_entry on nospan) */
memset (&us, 0, sizeof(us));
us.z_filefunc = *ffd;
central_pos = locate_central_directory (&us.z_filefunc);
if (0 == central_pos)
return NULL;
if (0 != ZSEEK (us.z_filefunc,
central_pos, SEEK_SET))
return NULL;
/* the signature, already checked */
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&us.z_filefunc, &uL))
return NULL;
/* number of this disk */
if (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&us.z_filefunc, &number_disk))
return NULL;
/* number of the disk with the start of the central directory */
if (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&us.z_filefunc, &number_disk_with_CD))
return NULL;
/* total number of entries in the central dir on this disk */
if (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&us.z_filefunc, &us.gi.number_entry))
return NULL;
/* total number of entries in the central dir */
if (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&us.z_filefunc, &number_entry_CD))
return NULL;
if ( (number_entry_CD != us.gi.number_entry) ||
(0 != number_disk_with_CD) ||
(0 != number_disk) )
return NULL;
/* size of the central directory */
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&us.z_filefunc, &us.size_central_dir))
return NULL;
/* offset of start of central directory with respect to the
starting disk number */
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&us.z_filefunc, &us.offset_central_dir))
return NULL;
/* zipfile comment length */
if (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&us.z_filefunc, &us.gi.size_comment))
return NULL;
us.gi.offset_comment = ZTELL (us.z_filefunc);
if ((central_pos < us.offset_central_dir + us.size_central_dir))
return NULL;
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;
us.encrypted = 0;
if (NULL == (file = malloc (sizeof(struct EXTRACTOR_UnzipFile))))
return NULL;
*file = us;
EXTRACTOR_common_unzip_go_to_first_file (file);
return file;
}
/**
* Close the file in zip opened with #EXTRACTOR_common_unzip_open_current_file().
*
* @return #EXTRACTOR_UNZIP_CRCERROR if all the file was read but the CRC is not good
*/
int
EXTRACTOR_common_unzip_close_current_file (struct EXTRACTOR_UnzipFile *file)
{
struct FileInZipReadInfo*pfile_in_zip_read_info;
int err = EXTRACTOR_UNZIP_OK;
if (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
if (NULL == (pfile_in_zip_read_info = file->pfile_in_zip_read))
return EXTRACTOR_UNZIP_PARAMERROR;
if ( (0 == pfile_in_zip_read_info->rest_read_uncompressed) &&
(pfile_in_zip_read_info->crc32 != pfile_in_zip_read_info->crc32_wait) )
err = EXTRACTOR_UNZIP_CRCERROR;
if (NULL != pfile_in_zip_read_info->read_buffer)
free (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;
free (pfile_in_zip_read_info);
file->pfile_in_zip_read = NULL;
return err;
}
/**
* Close a ZipFile.
*
* @param file zip file to close
* @return #EXTRACTOR_UNZIP_OK if there is no problem.
*/
int
EXTRACTOR_common_unzip_close (struct EXTRACTOR_UnzipFile *file)
{
if (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
if (NULL != file->pfile_in_zip_read)
EXTRACTOR_common_unzip_close_current_file (file);
free (file);
return EXTRACTOR_UNZIP_OK;
}
/**
* Obtain the global comment from a ZIP file.
*
* @param file unzip file to inspect
* @param comment where to copy the comment
* @param comment_len maximum number of bytes available in comment
* @return #EXTRACTOR_UNZIP_OK on success
*/
int
EXTRACTOR_common_unzip_get_global_comment (struct EXTRACTOR_UnzipFile *file,
char *comment,
size_t comment_len)
{
if (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
if (comment_len > file->gi.size_comment)
comment_len = file->gi.size_comment + 1;
if (0 !=
ZSEEK (file->z_filefunc, file->gi.offset_comment, SEEK_SET))
return EXTRACTOR_UNZIP_ERRNO;
if (comment_len - 1 !=
ZREAD (file->z_filefunc, comment, comment_len - 1))
return EXTRACTOR_UNZIP_ERRNO;
comment[comment_len - 1] = '\0';
return EXTRACTOR_UNZIP_OK;
}
/**
* Write info about the ZipFile in the *pglobal_info structure.
* No preparation of the structure is needed.
*
* @param file zipfile to manipulate
* @param pfile_info file information to initialize
* @param szFileName where to write the name of the current file
* @param fileNameBufferSize number of bytes available in szFileName
* @param extraField where to write extra data
* @param extraFieldBufferSize number of bytes available in extraField
* @param szComment where to write the comment on the current file
* @param commentBufferSize number of bytes available in szComment
* @return #EXTRACTOR_UNZIP_OK if there is no problem.
*/
int
EXTRACTOR_common_unzip_get_current_file_info (struct EXTRACTOR_UnzipFile *file,
struct EXTRACTOR_UnzipFileInfo *
pfile_info,
char *szFileName,
uLong fileNameBufferSize,
void *extraField,
uLong extraFieldBufferSize,
char *szComment,
uLong commentBufferSize)
{
return get_current_file_info (file, pfile_info, NULL,
szFileName, fileNameBufferSize,
extraField, extraFieldBufferSize,
szComment, commentBufferSize);
}
/**
* Set the current file of the zipfile to the next file.
*
* @param file zipfile to manipulate
* @return #EXTRACTOR_UNZIP_OK if there is no problem,
* #EXTRACTOR_UNZIP_END_OF_LIST_OF_FILE if the actual file was the latest.
*/
int
EXTRACTOR_common_unzip_go_to_next_file (struct EXTRACTOR_UnzipFile *file)
{
int err;
if (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
if (! file->current_file_ok)
return EXTRACTOR_UNZIP_END_OF_LIST_OF_FILE;
if (file->num_file + 1 == file->gi.number_entry)
return EXTRACTOR_UNZIP_END_OF_LIST_OF_FILE;
file->pos_in_central_dir += SIZECENTRALDIRITEM
+ file->cur_file_info.size_filename
+ file->cur_file_info.size_file_extra
+ file->cur_file_info.size_file_comment;
file->num_file++;
err = get_current_file_info (file,
&file->cur_file_info,
&file->cur_file_info_internal,
NULL, 0, NULL, 0, NULL, 0);
file->current_file_ok = (EXTRACTOR_UNZIP_OK == err);
return err;
}
/**
* Try locate the file szFileName in the zipfile.
*
* @param file zipfile to manipulate
* @param szFileName name to find
* @param iCaseSensitivity, use 1 for case sensitivity (like strcmp);
* 2 for no case sensitivity (like strcmpi or strcasecmp); or
* 0 for default of your operating system (like 1 on Unix, 2 on Windows)
* @return #EXTRACTOR_UNZIP_OK if the file is found. It becomes the current file.
* #EXTRACTOR_UNZIP_END_OF_LIST_OF_FILE if the file is not found
*/
int
EXTRACTOR_common_unzip_go_find_local_file (struct EXTRACTOR_UnzipFile *file,
const char *szFileName,
int iCaseSensitivity)
{
int err;
/* We remember the 'current' position in the file so that we can jump
* back there if we fail.
*/
struct EXTRACTOR_UnzipFileInfo cur_file_infoSaved;
struct UnzipFileInfoInternal cur_file_info_internalSaved;
uLong num_fileSaved;
uLong pos_in_central_dirSaved;
if (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
if (strlen (szFileName) >= UNZ_MAXFILENAMEINZIP)
return EXTRACTOR_UNZIP_PARAMERROR;
if (! file->current_file_ok)
return EXTRACTOR_UNZIP_END_OF_LIST_OF_FILE;
/* Save the current state */
num_fileSaved = file->num_file;
pos_in_central_dirSaved = file->pos_in_central_dir;
cur_file_infoSaved = file->cur_file_info;
cur_file_info_internalSaved = file->cur_file_info_internal;
err = EXTRACTOR_common_unzip_go_to_first_file (file);
while (EXTRACTOR_UNZIP_OK == err)
{
char szCurrentFileName[UNZ_MAXFILENAMEINZIP + 1];
if (EXTRACTOR_UNZIP_OK !=
(err = EXTRACTOR_common_unzip_get_current_file_info (file, NULL,
szCurrentFileName,
sizeof (
szCurrentFileName)
- 1,
NULL, 0, NULL, 0)))
break;
if (0 ==
EXTRACTOR_common_unzip_string_file_name_compare (szCurrentFileName,
szFileName,
iCaseSensitivity))
return EXTRACTOR_UNZIP_OK;
err = EXTRACTOR_common_unzip_go_to_next_file (file);
}
/* We failed, so restore the state of the 'current file' to where we
* were.
*/
file->num_file = num_fileSaved;
file->pos_in_central_dir = pos_in_central_dirSaved;
file->cur_file_info = cur_file_infoSaved;
file->cur_file_info_internal = cur_file_info_internalSaved;
return err;
}
/**
* Read bytes from the current file (must have been opened).
*
* @param buf contain buffer where data must be copied
* @param len the size of buf.
* @return the number of byte copied if some bytes are copied
* 0 if the end of file was reached
* <0 with error code if there is an error
* (#EXTRACTOR_UNZIP_ERRNO for IO error, or zLib error for uncompress error)
*/
ssize_t
EXTRACTOR_common_unzip_read_current_file (struct EXTRACTOR_UnzipFile *file,
void *buf,
size_t len)
{
int err = EXTRACTOR_UNZIP_OK;
uInt iRead = 0;
struct FileInZipReadInfo *pfile_in_zip_read_info;
if (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
if (NULL == (pfile_in_zip_read_info = file->pfile_in_zip_read))
return EXTRACTOR_UNZIP_PARAMERROR;
if (NULL == pfile_in_zip_read_info->read_buffer)
return EXTRACTOR_UNZIP_END_OF_LIST_OF_FILE;
if (0 == 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 ( (0 == pfile_in_zip_read_info->stream.avail_in) &&
(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 (0 == uReadThis)
return EXTRACTOR_UNZIP_EOF;
if (0 !=
ZSEEK (pfile_in_zip_read_info->z_filefunc,
pfile_in_zip_read_info->pos_in_zipfile
+ pfile_in_zip_read_info->byte_before_the_zipfile,
SEEK_SET))
return EXTRACTOR_UNZIP_ERRNO;
if (ZREAD (pfile_in_zip_read_info->z_filefunc,
pfile_in_zip_read_info->read_buffer,
uReadThis) != uReadThis)
return EXTRACTOR_UNZIP_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 (0 == pfile_in_zip_read_info->compression_method)
{
uInt uDoCopy;
if ( (0 == pfile_in_zip_read_info->stream.avail_in) &&
(0 == pfile_in_zip_read_info->rest_read_compressed) )
return (0 == iRead) ? EXTRACTOR_UNZIP_EOF : iRead;
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;
memcpy (pfile_in_zip_read_info->stream.next_out,
pfile_in_zip_read_info->stream.next_in,
uDoCopy);
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;
uLong 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 (Z_STREAM_END == err)
return (0 == iRead) ? EXTRACTOR_UNZIP_EOF : iRead;
if (Z_OK != err)
break;
}
}
if (Z_OK == err)
return iRead;
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)
*
* @param file zipfile to process
* @param piSizeVar where to store the size of the extra info
* @param poffset_local_extrafield where to store the offset of the local extrafield
* @param psoze_local_extrafield where to store the size of the local extrafield
* @return #EXTRACTOR_UNZIP_OK on success
*/
static int
parse_current_file_coherency_header (struct EXTRACTOR_UnzipFile *file,
uInt *piSizeVar,
uLong *poffset_local_extrafield,
uInt *psize_local_extrafield)
{
uLong uMagic;
uLong uData;
uLong uFlags;
uLong size_filename;
uLong size_extra_field;
*piSizeVar = 0;
*poffset_local_extrafield = 0;
*psize_local_extrafield = 0;
if (0 != ZSEEK (file->z_filefunc,
file->cur_file_info_internal.offset_curfile
+ file->byte_before_the_zipfile,
SEEK_SET))
return EXTRACTOR_UNZIP_ERRNO;
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc,
&uMagic))
return EXTRACTOR_UNZIP_ERRNO;
if (0x04034b50 != uMagic)
return EXTRACTOR_UNZIP_BADZIPFILE;
if ( (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &uData)) ||
(EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &uFlags)) )
return EXTRACTOR_UNZIP_ERRNO;
if (EXTRACTOR_UNZIP_OK != read_short_from_ffd (&file->z_filefunc, &uData))
return EXTRACTOR_UNZIP_ERRNO;
if (uData != file->cur_file_info.compression_method)
return EXTRACTOR_UNZIP_BADZIPFILE;
if ( (0 != file->cur_file_info.compression_method) &&
(Z_DEFLATED != file->cur_file_info.compression_method) )
return EXTRACTOR_UNZIP_BADZIPFILE;
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &uData)) /* date/time */
return EXTRACTOR_UNZIP_ERRNO;
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &uData)) /* crc */
return EXTRACTOR_UNZIP_ERRNO;
if ( (uData != file->cur_file_info.crc) &&
(0 == (uFlags & 8)) )
return EXTRACTOR_UNZIP_BADZIPFILE;
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc, &uData)) /* size compr */
return EXTRACTOR_UNZIP_ERRNO;
if ( (uData != file->cur_file_info.compressed_size) &&
(0 == (uFlags & 8)) )
return EXTRACTOR_UNZIP_BADZIPFILE;
if (EXTRACTOR_UNZIP_OK !=
read_long_from_ffd (&file->z_filefunc,
&uData)) /* size uncompr */
return EXTRACTOR_UNZIP_ERRNO;
if ( (uData != file->cur_file_info.uncompressed_size) &&
(0 == (uFlags & 8)))
return EXTRACTOR_UNZIP_BADZIPFILE;
if (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc, &size_filename))
return EXTRACTOR_UNZIP_ERRNO;
if (size_filename != file->cur_file_info.size_filename)
return EXTRACTOR_UNZIP_BADZIPFILE;
*piSizeVar += (uInt) size_filename;
if (EXTRACTOR_UNZIP_OK !=
read_short_from_ffd (&file->z_filefunc,
&size_extra_field))
return EXTRACTOR_UNZIP_ERRNO;
*poffset_local_extrafield = file->cur_file_info_internal.offset_curfile
+ SIZEZIPLOCALHEADER + size_filename;
*psize_local_extrafield = (uInt) size_extra_field;
*piSizeVar += (uInt) size_extra_field;
return EXTRACTOR_UNZIP_OK;
}
/**
* Open for reading data the current file in the zipfile.
*
* @param file zipfile to manipulate
* @return #EXTRACTOR_UNZIP_OK on success
*/
int
EXTRACTOR_common_unzip_open_current_file (struct EXTRACTOR_UnzipFile *file)
{
int err;
uInt iSizeVar;
struct FileInZipReadInfo *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 (NULL == file)
return EXTRACTOR_UNZIP_PARAMERROR;
if (! file->current_file_ok)
return EXTRACTOR_UNZIP_PARAMERROR;
if (NULL != file->pfile_in_zip_read)
EXTRACTOR_common_unzip_close_current_file (file);
if (EXTRACTOR_UNZIP_OK !=
parse_current_file_coherency_header (file,
&iSizeVar,
&offset_local_extrafield,
&size_local_extrafield))
return EXTRACTOR_UNZIP_BADZIPFILE;
if (NULL == (pfile_in_zip_read_info = malloc (sizeof(struct
FileInZipReadInfo))))
return EXTRACTOR_UNZIP_INTERNALERROR;
if (NULL == (pfile_in_zip_read_info->read_buffer = malloc (UNZ_BUFSIZE)))
{
free (pfile_in_zip_read_info);
return EXTRACTOR_UNZIP_INTERNALERROR;
}
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;
pfile_in_zip_read_info->stream_initialised = 0;
if ( (0 != file->cur_file_info.compression_method) &&
(Z_DEFLATED != file->cur_file_info.compression_method) )
{
// err = EXTRACTOR_UNZIP_BADZIPFILE;
// FIXME: we don't do anything with this 'err' code.
// Can this happen? Should we abort in this case?
}
pfile_in_zip_read_info->crc32_wait = file->cur_file_info.crc;
pfile_in_zip_read_info->crc32 = 0;
pfile_in_zip_read_info->compression_method =
file->cur_file_info.compression_method;
pfile_in_zip_read_info->z_filefunc = file->z_filefunc;
pfile_in_zip_read_info->byte_before_the_zipfile =
file->byte_before_the_zipfile;
pfile_in_zip_read_info->stream.total_out = 0;
if (Z_DEFLATED == file->cur_file_info.compression_method)
{
pfile_in_zip_read_info->stream.zalloc = (alloc_func) NULL;
pfile_in_zip_read_info->stream.zfree = (free_func) NULL;
pfile_in_zip_read_info->stream.opaque = NULL;
pfile_in_zip_read_info->stream.next_in = NULL;
pfile_in_zip_read_info->stream.avail_in = 0;
if (Z_OK != (err = inflateInit2 (&pfile_in_zip_read_info->stream,
-MAX_WBITS)))
{
free (pfile_in_zip_read_info->read_buffer);
free (pfile_in_zip_read_info);
return err;
}
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 =
file->cur_file_info.compressed_size;
pfile_in_zip_read_info->rest_read_uncompressed =
file->cur_file_info.uncompressed_size;
pfile_in_zip_read_info->pos_in_zipfile =
file->cur_file_info_internal.offset_curfile + SIZEZIPLOCALHEADER
+ iSizeVar;
pfile_in_zip_read_info->stream.avail_in = 0;
file->pfile_in_zip_read = pfile_in_zip_read_info;
return EXTRACTOR_UNZIP_OK;
}
/**
* Callback to perform read operation using LE API.
* Note that partial reads are not allowed.
*
* @param opaque the 'struct EXTRACTOR_ExtractContext'
* @param buf where to write bytes read
* @param size number of bytes desired
* @return number of bytes copied to buf
*/
static uLong
ec_read_file_func (voidpf opaque,
void*buf,
uLong size)
{
struct EXTRACTOR_ExtractContext *ec = opaque;
void *ptr;
ssize_t ret;
uLong done;
done = 0;
while (done < size)
{
ret = ec->read (ec->cls,
&ptr,
size - done);
if (ret <= 0)
return done;
memcpy (buf + done, ptr, ret);
done += ret;
}
return done;
}
/**
* Callback to obtain current offset in file using LE API.
*
* @param opaque the 'struct EXTRACTOR_ExtractContext'
* @return current offset in file, -1 on error
*/
static long
ec_tell_file_func (voidpf opaque)
{
struct EXTRACTOR_ExtractContext *ec = opaque;
return ec->seek (ec->cls, 0, SEEK_CUR);
}
/**
* Callback to perform seek operation using LE API.
*
* @param opaque the 'struct EXTRACTOR_ExtractContext'
* @param offset where to seek
* @param origin relative to where should we seek
* @return #EXTRACTOR_UNZIP_OK on success
*/
static long
ec_seek_file_func (voidpf opaque,
uLong offset,
int origin)
{
struct EXTRACTOR_ExtractContext *ec = opaque;
if (-1 == ec->seek (ec->cls, offset, origin))
return EXTRACTOR_UNZIP_INTERNALERROR;
return EXTRACTOR_UNZIP_OK;
}
/**
* Open a zip file for processing using the data access
* functions from the extract context.
*
* @param ec extract context to use
* @return handle to zip data, NULL on error
*/
struct EXTRACTOR_UnzipFile *
EXTRACTOR_common_unzip_open (struct EXTRACTOR_ExtractContext *ec)
{
struct FileFuncDefs ffd;
ffd.zread_file = &ec_read_file_func;
ffd.ztell_file = &ec_tell_file_func;
ffd.zseek_file = &ec_seek_file_func;
ffd.opaque = ec;
return unzip_open_using_ffd (&ffd);
}
/* end of unzip.c */
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