74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
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/*
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File: file_gif.c
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Copyright (C) 1998-2007 Christophe GRENIER <grenier@cgsecurity.org>
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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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#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_gif(file_stat_t *file_stat);
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static int header_check_gif(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_gif(file_recovery_t *file_recovery);
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const file_hint_t file_hint_gif= {
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.extension="gif",
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.description="Graphic Interchange Format",
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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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.register_header_check=®ister_header_check_gif
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};
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static const unsigned char gif_header[6]= { 'G','I','F','8','7','a'};
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static const unsigned char gif_header2[6]= { 'G','I','F','8','9','a'};
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static void register_header_check_gif(file_stat_t *file_stat)
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{
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register_header_check(0, gif_header,sizeof(gif_header), &header_check_gif, file_stat);
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register_header_check(0, gif_header2,sizeof(gif_header2), &header_check_gif, file_stat);
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}
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static int header_check_gif(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,gif_header,sizeof(gif_header))==0
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|| memcmp(buffer,gif_header2,sizeof(gif_header2))==0)
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{
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_gif.extension;
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file_recovery_new->file_check=&file_check_gif;
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file_recovery_new->min_filesize=42;
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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_gif(file_recovery_t *file_recovery)
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{
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const unsigned char gif_footer[2]= {0x00, 0x3b};
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file_search_footer(file_recovery, gif_footer,sizeof(gif_footer));
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}
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