241 lines
10 KiB
C
241 lines
10 KiB
C
/*
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File: file_psd.c
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Copyright (C) 2006-2009,2021 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_psd)
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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_PHOTOSHOP
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#include "log.h"
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#endif
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/* https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/ */
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_psd(file_stat_t *file_stat);
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const file_hint_t file_hint_psd= {
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.extension="psd",
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.description="Adobe Photoshop 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_psd
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};
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struct psd_file_header
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{
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char signature[4];
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uint16_t version; /* must be 1 */
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char reserved[6]; /* must be 0 */
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uint16_t channels; /* between 1 and 56 */
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uint32_t height; /* max of 30,000 */
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uint32_t width; /* max of 30,000 */
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uint16_t depth; /* 1, 8, 16 or 32 */
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uint16_t color_mode; /* Bitmap = 0; Grayscale = 1; Indexed = 2; RGB = 3; CMYK = 4; Multichannel = 7; Duotone = 8; Lab = 9 */
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} __attribute__ ((gcc_struct, __packed__));
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/*@
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@ requires \valid_read((char *)buffer + (offset .. offset + 3));
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@ assigns \nothing;
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@*/
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static uint32_t get_be32(const void *buffer, const unsigned int offset)
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{
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const uint32_t *val=(const uint32_t *)((const unsigned char *)buffer+offset);
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return be32(*val);
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}
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/*@
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@ requires file_recovery->data_check==&psd_skip_image_data;
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@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
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@ ensures valid_data_check_result(\result, file_recovery);
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@ ensures file_recovery->data_check==\null;
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@ ensures \result == DC_CONTINUE;
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@ assigns file_recovery->data_check, file_recovery->calculated_file_size;
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@*/
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static data_check_t psd_skip_image_data(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert buffer_size <= 2 * PHOTOREC_MAX_BLOCKSIZE; */
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file_recovery->calculated_file_size+=2;
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file_recovery->data_check=NULL;
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return DC_CONTINUE;
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}
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/*@
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@ requires file_recovery->data_check==&psd_skip_layer_info;
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@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
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@ ensures valid_data_check_result(\result, file_recovery);
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@ ensures file_recovery->data_check==&psd_skip_layer_info || file_recovery->data_check==\null;
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@ ensures \result == DC_CONTINUE || \result == DC_STOP;
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@ assigns file_recovery->data_check, file_recovery->calculated_file_size;
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@*/
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static data_check_t psd_skip_layer_info(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert buffer_size <= 2 * PHOTOREC_MAX_BLOCKSIZE; */
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if(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 4 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
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/*@ assert 0 <= i < buffer_size - 4 ; */
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const unsigned int l=get_be32(buffer, i);
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#ifdef DEBUG_PHOTOSHOP
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log_info("Layer info at 0x%lx, l=0x%x\n", (long unsigned)file_recovery->calculated_file_size, l);
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#endif
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file_recovery->calculated_file_size+=(uint64_t)l+4;
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#ifdef DEBUG_PHOTOSHOP
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log_info("Image data at 0x%lx\n", (long unsigned)file_recovery->calculated_file_size);
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#endif
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file_recovery->data_check=&psd_skip_image_data;
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return psd_skip_image_data(buffer, buffer_size, file_recovery);
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}
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return DC_CONTINUE;
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}
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/*@
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@ requires file_recovery->data_check==&psd_skip_image_resources;
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@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
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@ ensures valid_data_check_result(\result, file_recovery);
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@ ensures file_recovery->data_check==&psd_skip_image_resources || file_recovery->data_check==&psd_skip_layer_info || file_recovery->data_check==\null;
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@ ensures \result == DC_CONTINUE || \result == DC_STOP;
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@ assigns file_recovery->data_check, file_recovery->calculated_file_size;
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@*/
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static data_check_t psd_skip_image_resources(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert buffer_size <= 2 * PHOTOREC_MAX_BLOCKSIZE; */
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if(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 4 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
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/*@ assert 0 <= i < buffer_size - 4 ; */
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const unsigned int l=get_be32(buffer, i);
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#ifdef DEBUG_PHOTOSHOP
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log_info("Image resource at 0x%lx, l=0x%x\n", (long unsigned)file_recovery->calculated_file_size, l);
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#endif
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file_recovery->calculated_file_size+=(uint64_t)l+4;
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#ifdef DEBUG_PHOTOSHOP
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log_info("Layer info at 0x%lx\n", (long unsigned)file_recovery->calculated_file_size);
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#endif
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file_recovery->data_check=&psd_skip_layer_info;
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return psd_skip_layer_info(buffer, buffer_size, file_recovery);
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}
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return DC_CONTINUE;
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}
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/*@
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@ requires buffer_size >= 32;
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@ requires file_recovery->data_check==&psd_skip_color_mode;
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@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
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@ ensures valid_data_check_result(\result, file_recovery);
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@ ensures file_recovery->data_check==&psd_skip_color_mode || file_recovery->data_check==&psd_skip_image_resources || file_recovery->data_check==&psd_skip_layer_info || file_recovery->data_check==\null;
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@ assigns file_recovery->data_check, file_recovery->calculated_file_size;
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@*/
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static data_check_t psd_skip_color_mode(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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const struct psd_file_header *hdr=(const struct psd_file_header *)&buffer[buffer_size/2];
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const unsigned int channels=be16(hdr->channels);
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const unsigned int depth=be16(hdr->depth);
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const unsigned int height=be32(hdr->height);
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const unsigned int width=be32(hdr->width);
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if(channels==0 || channels>56 ||
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height==0 || height>30000 ||
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width==0 || width>30000 ||
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(depth!=1 && depth!=8 && depth!=16 && depth!=32))
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return DC_ERROR;
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/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
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/*@ assert buffer_size <= 2 * PHOTOREC_MAX_BLOCKSIZE; */
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if(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 4 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size + buffer_size/2 - file_recovery->file_size;
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/*@ assert 0 <= i < buffer_size - 4 ; */
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const unsigned int l=get_be32(buffer, i);
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#ifdef DEBUG_PHOTOSHOP
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log_info("Color mode at 0x%lx, l=0x%x\n", (long unsigned)file_recovery->calculated_file_size, l);
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#endif
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if(l!=0 && l<4)
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return DC_ERROR;
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file_recovery->calculated_file_size+=(uint64_t)l+4;
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file_recovery->data_check=&psd_skip_image_resources;
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return psd_skip_image_resources(buffer, buffer_size, file_recovery);
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}
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return DC_CONTINUE;
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}
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/*@
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@ requires buffer_size >= sizeof(struct psd_file_header);
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@ requires separation: \separated(&file_hint_psd, 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_psd(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 psd_file_header *hdr=(const struct psd_file_header *)buffer;
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const unsigned int channels=be16(hdr->channels);
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const unsigned int depth=be16(hdr->depth);
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const unsigned int height=be32(hdr->height);
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const unsigned int width=be32(hdr->width);
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#ifdef DEBUG_PHOTOSHOP
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log_info("channels %u\n", channels);
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log_info("height %u\n", height);
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log_info("width %u\n", width);
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log_info("depth %u\n", depth);
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log_info("color_mode %u\n", be16(hdr->color_mode));
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#endif
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if(channels==0 || channels>56 ||
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height==0 || height>30000 ||
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width==0 || width>30000 ||
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(depth!=1 && depth!=8 && depth!=16 && depth!=32))
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->min_filesize=70;
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file_recovery_new->extension=file_hint_psd.extension;
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if(file_recovery_new->blocksize < 16)
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return 1;
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/* File header */
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file_recovery_new->calculated_file_size=0x1a;
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file_recovery_new->data_check=&psd_skip_color_mode;
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file_recovery_new->file_check=&file_check_size_min;
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return 1;
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}
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static void register_header_check_psd(file_stat_t *file_stat)
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{
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static const unsigned char psd_header[6]={'8', 'B', 'P', 'S', 0x00, 0x01};
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register_header_check(0, psd_header,sizeof(psd_header), &header_check_psd, file_stat);
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}
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#endif
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