168 lines
6.5 KiB
C
168 lines
6.5 KiB
C
/*
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File: file_psb.c
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Copyright (C) 2006-2009,2013 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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#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_PSD
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#include "log.h"
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#endif
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static void register_header_check_psb(file_stat_t *file_stat);
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static int header_check_psb(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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static data_check_t psb_skip_color_mode(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery);
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static void file_check_psb(file_recovery_t *file_recovery);
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const file_hint_t file_hint_psb= {
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.extension="psb",
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.description="Adobe Photoshop Image",
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.min_header_distance=0,
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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_psb
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};
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static const unsigned char psb_header[6]={'8', 'B', 'P', 'S', 0x00, 0x02};
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static uint64_t psb_image_data_size_max=0;
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struct psb_file_header
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{
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char signature[4];
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uint16_t version; /* must be 2 */
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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 300,000 */
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uint32_t width; /* max of 300,000 */
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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__ ((__packed__));
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static void register_header_check_psb(file_stat_t *file_stat)
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{
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register_header_check(0, psb_header,sizeof(psb_header), &header_check_psb, file_stat);
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}
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static int header_check_psb(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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if(memcmp(buffer,psb_header,sizeof(psb_header))==0)
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{
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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_psb.extension;
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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=&psb_skip_color_mode;
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file_recovery_new->file_check=&file_check_psb;
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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 uint64_t get_be64(const void *buffer, const unsigned int offset)
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{
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const uint64_t *val=(const uint64_t *)((const unsigned char *)buffer+offset);
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return be64(*val);
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}
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static data_check_t psb_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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file_recovery->file_check=NULL;
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return DC_CONTINUE;
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}
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static data_check_t psb_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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while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 16 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
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const unsigned int l=get_be64(buffer, i)+8;
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#ifdef DEBUG_PSD
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log_info("Image data at 0x%lx\n", (long unsigned)(l + file_recovery->calculated_file_size));
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#endif
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if(l<4)
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return DC_STOP;
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file_recovery->calculated_file_size+=l;
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file_recovery->data_check=&psb_skip_image_data;
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return psb_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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static data_check_t psb_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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while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 16 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
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const unsigned int l=get_be64(buffer, i)+8;
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#ifdef DEBUG_PSD
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log_info("Layer info at 0x%lx\n", (long unsigned)(l + file_recovery->calculated_file_size));
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#endif
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if(l<4)
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return DC_STOP;
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file_recovery->calculated_file_size+=l;
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file_recovery->data_check=&psb_skip_layer_info;
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return psb_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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static data_check_t psb_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 psb_file_header *psb=(const struct psb_file_header *)&buffer[buffer_size/2];
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psb_image_data_size_max=(uint64_t)le16(psb->channels) * le32(psb->height) * le32(psb->width) * le16(psb->depth) / 8;
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#ifdef DEBUG_PSD
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log_info("psb_image_data_size_max %lu\n", (long unsigned)psb_image_data_size_max);
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#endif
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while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
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file_recovery->calculated_file_size + 16 < file_recovery->file_size + buffer_size/2)
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{
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const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
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const unsigned int l=get_be64(buffer, i)+8;
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#ifdef DEBUG_PSD
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log_info("Color mode at 0x%lx\n", (long unsigned)(l + file_recovery->calculated_file_size));
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#endif
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if(l<4)
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return DC_STOP;
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file_recovery->calculated_file_size+=l;
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file_recovery->data_check=&psb_skip_image_resources;
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return psb_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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static void file_check_psb(file_recovery_t *file_recovery)
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{
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if(file_recovery->file_size < file_recovery->calculated_file_size)
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file_recovery->file_size=0;
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else if(file_recovery->file_size > file_recovery->calculated_file_size + psb_image_data_size_max)
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file_recovery->file_size=file_recovery->calculated_file_size + psb_image_data_size_max;
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}
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