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/*
File: file_pcx.c
Copyright (C) 2006-2008 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_pcx)
#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"
#ifdef DEBUG_PCX
#include "log.h"
#endif
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_pcx(file_stat_t *file_stat);
const file_hint_t file_hint_pcx= {
.extension="pcx",
.description="PCX bitmap image",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_pcx
};
struct pcx_file_entry {
uint8_t Manufacturer; /* should always be 0Ah */
uint8_t Version;
/* Version
* 0x00 PCX ver. 2.5 image data
* 0x02 PCX ver. 2.8 image data, with palette
* 0x03 PCX ver. 2.8 image data, without palette
* 0x04 PCX for Windows image data
* 0x05 PCX ver. 3.0 image data
*/
uint8_t Encoding; /* 0: uncompressed, 1: RLE compressed */
uint8_t BitsPerPixel;
uint16_t XMin; /* image width = XMax-XMin */
uint16_t YMin; /* image height = YMax-YMin */
uint16_t XMax;
uint16_t YMax;
uint16_t VertDPI;
uint8_t Palette[48];
uint8_t Reserved;
uint8_t ColorPlanes;
/* 4 -- 16 colors
* 3 -- 24 bit color (16.7 million colors)
*/
uint16_t BytesPerLine;
uint16_t PaletteType;
uint16_t HScrSize; /* only supported by */
uint16_t VScrSize; /* PC Paintbrush IV or higher */
uint8_t Filler[56];
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires buffer_size >= sizeof(struct pcx_file_entry);
@ requires separation: \separated(&file_hint_pcx, 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_pcx(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 pcx_file_entry *pcx=(const struct pcx_file_entry *)buffer;
if(pcx->Manufacturer==0x0a &&
(pcx->Version<=5 && pcx->Version!=1) &&
pcx->Encoding <=1 &&
(pcx->BitsPerPixel==1 || pcx->BitsPerPixel==4 ||
pcx->BitsPerPixel==8 || pcx->BitsPerPixel==24) &&
pcx->Reserved==0 &&
le16(pcx->XMin) <= le16(pcx->XMax) &&
le16(pcx->YMin) <= le16(pcx->YMax) &&
pcx->BytesPerLine>0 && pcx->BytesPerLine%2==0 &&
pcx->Filler[0]==0 && pcx->Filler[1]==0 &&
pcx->Filler[54]==0 && pcx->Filler[55]==0)
{
reset_file_recovery(file_recovery_new);
#ifdef DEBUG_PCX
log_info("X %u-%u, Y %u-%u\n",
le16(pcx->XMin), le16(pcx->XMax),
le16(pcx->YMin), le16(pcx->YMax));
log_info("ColorPlanes %u\n", pcx->ColorPlanes);
log_info("BytesPerLine %u - %u\n", pcx->BytesPerLine, (le16(pcx->XMax)-le16(pcx->XMin)+1)*pcx->BitsPerPixel/8);
#endif
file_recovery_new->extension=file_hint_pcx.extension;
return 1;
}
return 0;
}
static void register_header_check_pcx(file_stat_t *file_stat)
{
static const unsigned char pcx_header[1]= {0x0a};
register_header_check(0, pcx_header,sizeof(pcx_header), &header_check_pcx, file_stat);
}
#endif
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