90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*
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File: file_xcf.c
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Copyright (C) 2006-2007 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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#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_xcf)
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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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#include "common.h"
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/*@ requires \valid(file_stat); */
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static void register_header_check_xcf(file_stat_t *file_stat);
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const file_hint_t file_hint_xcf = {
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.extension = "xcf",
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.description = "Gimp XCF File",
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.max_filesize = 1024 * 1024 * 1024,
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.recover = 1,
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.enable_by_default = 1,
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.register_header_check = ®ister_header_check_xcf
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};
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// https://git.gnome.org/browse/gimp/tree/devel-docs/xcf.txt
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struct xcf_header
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{
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unsigned char magic[9];
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unsigned char version[4];
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unsigned char zero;
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uint32_t width;
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uint32_t heigth;
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uint32_t base_type;
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} __attribute__((gcc_struct, __packed__));
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/*@
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@ requires buffer_size >= sizeof(struct xcf_header);
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@ requires \valid_read(buffer+(0..buffer_size-1));
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@ requires valid_file_recovery(file_recovery);
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@ requires \valid(file_recovery_new);
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@ requires file_recovery_new->blocksize > 0;
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@ requires separation: \separated(&file_hint_xcf, buffer+(..), file_recovery, file_recovery_new);
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@ ensures \result!=0 ==> valid_file_recovery(file_recovery_new);
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@ assigns *file_recovery_new;
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@*/
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static int header_check_xcf(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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const struct xcf_header *hdr = (const struct xcf_header *)buffer;
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if(hdr->zero != 0)
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return 0;
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if(be32(hdr->width) == 0 || be32(hdr->heigth) == 0)
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return 0;
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if(be32(hdr->base_type) > 2)
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension = file_hint_xcf.extension;
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return 1;
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}
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static void register_header_check_xcf(file_stat_t *file_stat)
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{
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register_header_check(0, "gimp xcf file", 13, &header_check_xcf, file_stat);
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#ifndef __FRAMAC__
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register_header_check(0, "gimp xcf v001", 13, &header_check_xcf, file_stat);
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register_header_check(0, "gimp xcf v002", 13, &header_check_xcf, file_stat);
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#endif
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}
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#endif
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