182 lines
6.5 KiB
C
182 lines
6.5 KiB
C
/*
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File: file_indd.c
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Copyright (C) 2007 Christophe GRENIER <grenier@cgsecurity.org>
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Copyright (C) 2007 Peter Turczak <pnospamt@netconsequence.de>
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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_indd)
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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 "common.h"
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#include "filegen.h"
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#include "log.h"
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_indd(file_stat_t *file_stat);
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const file_hint_t file_hint_indd= {
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.extension="indd",
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.description="InDesign File",
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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_indd
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};
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/* See http://www.adobe.com/content/dam/Adobe/en/devnet/xmp/pdfs/cs6/XMPSpecificationPart3.pdf
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* for more information about the file format */
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// Headers are: DE393979-5188-4b6c-8E63-EEF8AEE0DD38
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// Trailers are: FDCEDB70-F786-4b4f-A4D3-C728B3417106
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static const unsigned char kINDDContigObjHeaderGUID [16] =
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{ 0xDE, 0x39, 0x39, 0x79, 0x51, 0x88, 0x4B, 0x6C, 0x8E, 0x63, 0xEE, 0xF8, 0xAE, 0xE0, 0xDD, 0x38 };
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struct InDesignMasterPage {
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uint8_t fGUID [16];
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uint8_t fMagicBytes [8];
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uint8_t fObjectStreamEndian;
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uint8_t fIrrelevant1 [239];
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uint64_t fSequenceNumber;
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uint8_t fIrrelevant2 [8];
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uint32_t fFilePages;
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uint8_t fIrrelevant3 [3812];
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} __attribute__ ((gcc_struct, __packed__));
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struct InDesignContigObjMarker {
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uint8_t fGUID [16];
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uint32_t fObjectUID;
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uint32_t fObjectClassID;
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uint32_t fStreamLength;
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uint32_t fChecksum;
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} __attribute__ ((gcc_struct, __packed__));
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/*@
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@ requires file_recovery->file_check == &file_check_indd;
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@ requires \separated(file_recovery, file_recovery->handle, file_recovery->extension, &errno, &Frama_C_entropy_source);
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@ requires valid_file_check_param(file_recovery);
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@ ensures valid_file_check_result(file_recovery);
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@ assigns *file_recovery->handle, errno, file_recovery->file_size;
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@ assigns Frama_C_entropy_source;
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@*/
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static void file_check_indd(file_recovery_t *file_recovery)
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{
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const uint64_t file_size_org=file_recovery->file_size;
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uint64_t offset;
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if(file_recovery->file_size<file_recovery->calculated_file_size)
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{
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file_recovery->file_size=0;
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return ;
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}
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offset=file_recovery->calculated_file_size;
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/*@
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@ loop assigns *file_recovery->handle, errno, file_recovery->file_size;
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@ loop assigns Frama_C_entropy_source;
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@ loop assigns offset;
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@*/
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do
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{
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char buffer[sizeof(struct InDesignContigObjMarker)];
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const struct InDesignContigObjMarker *hdr=(const struct InDesignContigObjMarker *)&buffer;;
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#ifdef DEBUG_INDD
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log_info("file_check_indd offset=%llu (0x%llx)\n", (long long unsigned)offset, (long long unsigned)offset);
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#endif
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if(my_fseek(file_recovery->handle, offset, SEEK_SET) < 0)
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{
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file_recovery->file_size=0;
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return ;
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}
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if(fread(buffer, sizeof(buffer), 1, file_recovery->handle) != 1)
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{
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file_recovery->file_size=(offset+4096-1)/4096*4096;
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if(file_recovery->file_size>file_size_org)
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file_recovery->file_size=0;
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return ;
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}
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#ifdef __FRAMAC__
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Frama_C_make_unknown(buffer, sizeof(buffer));
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#endif
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if(memcmp(hdr->fGUID, kINDDContigObjHeaderGUID, sizeof(kINDDContigObjHeaderGUID))!=0)
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{
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file_recovery->file_size=(offset+4096-1)/4096*4096;
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if(file_recovery->file_size>file_size_org)
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file_recovery->file_size=0;
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return ;
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}
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/* header + data + trailer */
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offset+=(uint64_t)le32(hdr->fStreamLength)+2*sizeof(struct InDesignContigObjMarker);
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} while(offset < file_size_org);
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file_recovery->file_size=(offset+4096-1)/4096*4096;
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if(file_recovery->file_size>file_size_org)
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file_recovery->file_size=0;
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return ;
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}
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/*@
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@ requires buffer_size >= 4096 + sizeof(struct InDesignMasterPage);
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@ requires separation: \separated(&file_hint_indd, 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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@*/
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static int header_check_indd(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 InDesignMasterPage *hdr;
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const struct InDesignMasterPage *hdr0 = (const struct InDesignMasterPage *)buffer;
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const struct InDesignMasterPage *hdr1 = (const struct InDesignMasterPage *)&buffer[4096];
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hdr=(le64(hdr0->fSequenceNumber) > le64(hdr1->fSequenceNumber) ? hdr0 : hdr1);
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if(hdr->fObjectStreamEndian!=1 && hdr->fObjectStreamEndian!=2)
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return 0;
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if(le32(hdr->fFilePages)==0)
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return 0;
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if(file_recovery->file_stat!=NULL &&
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file_recovery->file_stat->file_hint==&file_hint_indd)
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{
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if(header_ignored_adv(file_recovery, file_recovery_new)==0)
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return 0;
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}
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reset_file_recovery(file_recovery_new);
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#ifdef DJGPP
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file_recovery_new->extension="ind";
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#else
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file_recovery_new->extension=file_hint_indd.extension;
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#endif
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/* Contiguous object pages may follow, file_check_indd will search for them */
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file_recovery_new->calculated_file_size=(uint64_t)(le32(hdr->fFilePages))*4096;
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file_recovery_new->file_check=&file_check_indd;
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#ifdef DEBUG_INDD
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log_info("header_check_indd: Guessed length: %llu.\n", (long long unsigned)file_recovery_new->calculated_file_size);
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#endif
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return 1;
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}
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static void register_header_check_indd(file_stat_t *file_stat)
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{
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static const unsigned char indd_header[24]={
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0x06, 0x06, 0xed, 0xf5, 0xd8, 0x1d, 0x46, 0xe5,
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0xbd, 0x31, 0xef, 0xe7, 0xfe, 0x74, 0xb7, 0x1d,
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0x44, 0x4f, 0x43, 0x55, 0x4d, 0x45, 0x4e, 0x54 };
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register_header_check(0, indd_header,sizeof(indd_header), &header_check_indd, file_stat);
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}
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#endif
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