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