122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
/*
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File: file_ysfc100.c
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Copyright (C) 2016 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_x4a)
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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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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_ysfc100(file_stat_t *file_stat);
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const file_hint_t file_hint_x4a = {
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.extension = "x4a",
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.description = "Yamaha-YSFC",
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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_ysfc100
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};
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struct x4a_catalog
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{
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char type[4];
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uint32_t size;
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} __attribute__((gcc_struct, __packed__));
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/*@
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@ requires fr->file_check == &file_check_x4a;
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@ requires valid_file_check_param(fr);
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@ ensures valid_file_check_result(fr);
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@ assigns *fr->handle, errno, fr->file_size;
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@ assigns Frama_C_entropy_source;
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@*/
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static void file_check_x4a(file_recovery_t *fr)
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{
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char buffer[0x200];
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unsigned int i;
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unsigned int fs = 0x80;
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fr->file_size = 0;
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if(my_fseek(fr->handle, 0, SEEK_SET) < 0 || fread(&buffer, sizeof(buffer), 1, fr->handle) != 1)
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return;
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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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/*@
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@ loop assigns i, fs;
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@*/
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for(i = 0x80; i < 0x200; i += 8)
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{
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/*@ assert i <= 0x200 - 8; */
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const struct x4a_catalog *p = (const struct x4a_catalog *)&buffer[i];
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const unsigned int tmp = be32(p->size);
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if(tmp > fs)
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fs = tmp;
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}
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{
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const struct x4a_catalog *p = (const struct x4a_catalog *)buffer;
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fr->file_size = (uint64_t)fs + be32(p->size);
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}
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}
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/*@
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@ requires buffer_size >= 0x34;
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@ requires separation: \separated(&file_hint_x4a, 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_ysfc100(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[0x10], "Ver 01.00", 8) != 0 || memcmp(&buffer[0x30], "YSFC", 4) != 0)
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return 0;
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reset_file_recovery(file_recovery_new);
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if(memcmp(&buffer[6], "ALL", 3) == 0)
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file_recovery_new->extension = file_hint_x4a.extension;
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else if(memcmp(&buffer[6], "SONG", 4) == 0)
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file_recovery_new->extension = "x4s";
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else if(memcmp(&buffer[6], "PATTERN", 7) == 0)
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file_recovery_new->extension = "x4p";
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else if(memcmp(&buffer[6], "ARPEGGIO", 8) == 0)
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file_recovery_new->extension = "x4g";
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else
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file_recovery_new->extension = file_hint_x4a.extension;
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file_recovery_new->min_filesize = 0x200;
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file_recovery_new->file_check = &file_check_x4a;
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return 1;
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}
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static void register_header_check_ysfc100(file_stat_t *file_stat)
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{
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static const unsigned char ysfc100_header[8] = {
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'Y', 'S', 'F', 'C', 0xff, 0xff, 0xff, 0xff
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};
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register_header_check(0x30, ysfc100_header, sizeof(ysfc100_header), &header_check_ysfc100, file_stat);
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}
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#endif
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