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/*
File: file_xcf.c
Copyright (C) 2006-2007 Christophe GRENIER <grenier@cgsecurity.org>
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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_xcf)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_xcf(file_stat_t *file_stat);
const file_hint_t file_hint_xcf = {
.extension = "xcf",
.description = "Gimp XCF File",
.max_filesize = 1024 * 1024 * 1024,
.recover = 1,
.enable_by_default = 1,
.register_header_check = ®ister_header_check_xcf
};
// https://git.gnome.org/browse/gimp/tree/devel-docs/xcf.txt
struct xcf_header
{
unsigned char magic[9];
unsigned char version[4];
unsigned char zero;
uint32_t width;
uint32_t heigth;
uint32_t base_type;
} __attribute__((gcc_struct, __packed__));
/*@
@ requires buffer_size >= sizeof(struct xcf_header);
@ requires separation: \separated(&file_hint_xcf, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
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)
{
const struct xcf_header *hdr = (const struct xcf_header *)buffer;
if(hdr->zero != 0)
return 0;
if(be32(hdr->width) == 0 || be32(hdr->heigth) == 0)
return 0;
if(be32(hdr->base_type) > 2)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension = file_hint_xcf.extension;
return 1;
}
static void register_header_check_xcf(file_stat_t *file_stat)
{
register_header_check(0, "gimp xcf file", 13, &header_check_xcf, file_stat);
#ifndef DISABLED_FOR_FRAMAC
register_header_check(0, "gimp xcf v00", 12, &header_check_xcf, file_stat);
register_header_check(0, "gimp xcf v01", 12, &header_check_xcf, file_stat);
#endif
}
#endif
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