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/*
File: file_woff.c
Copyright (C) 2014 Christophe GRENIER <grenier@cgsecurity.org>
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_woff)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_woff(file_stat_t *file_stat);
const file_hint_t file_hint_woff = {
.extension = "woff",
.description = "Web Open Font Format",
.max_filesize = PHOTOREC_MAX_FILE_SIZE,
.recover = 1,
.enable_by_default = 1,
.register_header_check = ®ister_header_check_woff
};
struct WOFFHeader
{
uint32_t signature;
uint32_t flavor;
uint32_t length;
uint16_t numTables;
uint16_t reserved;
uint32_t totalSfntSize;
uint16_t majorVersion;
uint16_t minorVersion;
uint32_t metaOffset;
uint32_t metaLength;
uint32_t metaOrigLength;
uint32_t privOffset;
uint32_t privLength;
} __attribute__((gcc_struct, __packed__));
/*@
@ requires buffer_size >= sizeof(struct WOFFHeader);
@ requires separation: \separated(&file_hint_woff, 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);
@ assigns *file_recovery_new;
@*/
static int header_check_woff(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 WOFFHeader *woff = (const struct WOFFHeader *)buffer;
const uint32_t length = be32(woff->length);
const uint32_t metaLength = be32(woff->metaLength);
const uint32_t metaOffset = be32(woff->metaOffset);
const uint32_t privLength = be32(woff->privLength);
const uint32_t privOffset = be32(woff->privOffset);
if(length < sizeof(struct WOFFHeader))
return 0;
if(metaOffset > 0 && metaOffset < sizeof(struct WOFFHeader))
return 0;
if(privOffset > 0 && privOffset < sizeof(struct WOFFHeader))
return 0;
if((uint64_t)metaOffset + metaLength > length || (uint64_t)privOffset + privLength > length)
return 0;
if(woff->reserved != 0)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension = file_hint_woff.extension;
file_recovery_new->calculated_file_size = length;
file_recovery_new->data_check = &data_check_size;
file_recovery_new->file_check = &file_check_size;
return 1;
}
static void register_header_check_woff(file_stat_t *file_stat)
{
register_header_check(0, "wOFF", 4, &header_check_woff, file_stat);
}
#endif
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