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/*
File: file_png.c
Copyright (C) 1998-2006 Christophe GRENIER <grenier@cgsecurity.org>
Thanks to Holger Klemm for JNG (JPEG Network Graphics) and
MNG (Multiple-Image Network Graphics) support (2006)
This software 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
MNG (Multiple-image Network Graphics) Format
http://www.libpng.org/pub/mng/spec/
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "photorec.h"
static const char* header_check_png(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, t_file_recovery *file_recovery);
static void file_check_png(t_file_recovery *file_recovery);
const t_file_hint file_hint_png= {
.extension="png",
.description="Portable/JPEG/Multiple-Image Network Graphics",
.min_header_distance=0,
.min_filesize=92,
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.header_check=&header_check_png,
.data_check=NULL,
.file_check=file_check_png
};
static const char* header_check_png(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, t_file_recovery *file_recovery)
{
const unsigned char png_header[8]= { 0x89, 'P', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
const unsigned char mng_header[8]= { 0x8a, 'M', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
const unsigned char jng_header[8]= { 0x8b, 'J', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
if(memcmp(buffer,png_header,sizeof(png_header))==0)
return file_hint_png.extension;
if(memcmp(buffer,jng_header,sizeof(jng_header))==0)
return "jng";
if(memcmp(buffer,mng_header,sizeof(mng_header))==0)
return "mng";
return NULL;
}
static void file_check_png(t_file_recovery *file_recovery)
{
const unsigned char mng_footer[4]= {'M','E','N','D'};
const unsigned char png_footer[4]= {'I','E','N','D'};
if(strstr(file_recovery->filename,".mng")!=NULL)
file_search_footer(file_recovery, mng_footer,sizeof(mng_footer));
else
file_search_footer(file_recovery, png_footer,sizeof(png_footer));
if(file_recovery->file_size>0)
file_recovery->file_size+=4;
}
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