104 lines
3.7 KiB
C
104 lines
3.7 KiB
C
/*
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File: file_png.c
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Copyright (C) 1998-2007 Christophe GRENIER <grenier@cgsecurity.org>
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Thanks to Holger Klemm for JNG (JPEG Network Graphics) and
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MNG (Multiple-Image Network Graphics) support (2006)
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This software is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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MNG (Multiple-image Network Graphics) Format
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http://www.libpng.org/pub/mng/spec/
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include "types.h"
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#include "filegen.h"
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static void register_header_check_png(file_stat_t *file_stat);
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static int header_check_png(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new);
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static void file_check_png(file_recovery_t *file_recovery);
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const file_hint_t file_hint_png= {
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.extension="png",
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.description="Portable/JPEG/Multiple-Image Network Graphics",
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.min_header_distance=0,
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.max_filesize=PHOTOREC_MAX_FILE_SIZE,
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.recover=1,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_png
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};
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static const unsigned char png_header[8]= { 0x89, 'P', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
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static const unsigned char mng_header[8]= { 0x8a, 'M', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
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static const unsigned char jng_header[8]= { 0x8b, 'J', 'N','G', 0x0d, 0x0a, 0x1a, 0x0a};
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static void register_header_check_png(file_stat_t *file_stat)
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{
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register_header_check(0, png_header,sizeof(png_header), &header_check_png, file_stat);
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register_header_check(0, mng_header,sizeof(mng_header), &header_check_png, file_stat);
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register_header_check(0, jng_header,sizeof(jng_header), &header_check_png, file_stat);
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}
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static int header_check_png(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
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{
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if(memcmp(buffer,png_header,sizeof(png_header))==0)
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{
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reset_file_recovery(file_recovery_new);
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file_recovery_new->min_filesize=92;
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file_recovery_new->file_check=file_check_png;
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file_recovery_new->extension=file_hint_png.extension;
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return 1;
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}
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if(memcmp(buffer,jng_header,sizeof(jng_header))==0)
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{
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reset_file_recovery(file_recovery_new);
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file_recovery_new->min_filesize=92;
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file_recovery_new->file_check=file_check_png;
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file_recovery_new->extension="jng";
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return 1;
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}
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if(memcmp(buffer,mng_header,sizeof(mng_header))==0)
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{
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reset_file_recovery(file_recovery_new);
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file_recovery_new->min_filesize=92;
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file_recovery_new->file_check=file_check_png;
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file_recovery_new->extension="mng";
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return 1;
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}
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return 0;
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}
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static void file_check_png(file_recovery_t *file_recovery)
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{
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const unsigned char mng_footer[4]= {'M','E','N','D'};
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const unsigned char png_footer[4]= {'I','E','N','D'};
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if(strstr(file_recovery->filename,".mng")!=NULL)
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file_search_footer(file_recovery, mng_footer,sizeof(mng_footer));
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else
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file_search_footer(file_recovery, png_footer,sizeof(png_footer));
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if(file_recovery->file_size>0)
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file_recovery->file_size+=4;
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}
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