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