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/* fuzzer_seek
* Copyright (C) 2022 Xiph.Org Foundation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of the Xiph.org Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <cstdlib>
#include <cstring> /* for memcpy */
#include "FLAC/stream_decoder.h"
#if 0 /* set to 1 to debug */
#define FPRINTF_DEBUG_ONLY(...) fprintf(__VA_ARGS__)
#else
#define FPRINTF_DEBUG_ONLY(...)
#endif
#define CONFIG_LENGTH 1
static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *const buffer[], void *client_data)
{
(void)decoder, (void)frame, (void)buffer, (void)client_data;
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
static void error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus error, void *client_data)
{
(void)decoder, (void)error, (void)client_data;
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
FLAC__bool decoder_valid = true;
FLAC__StreamDecoder *decoder;
uint8_t command_length;
FLAC__bool init_bools[16], ogg;
/* allocate the decoder */
if((decoder = FLAC__stream_decoder_new()) == NULL) {
fprintf(stderr, "ERROR: allocating decoder\n");
return 1;
}
/* Use first byte for configuration, leave at least one byte of input */
if(size < 1 + CONFIG_LENGTH){
FLAC__stream_decoder_delete(decoder);
return 0;
}
/* First 4 bits for configuration bools, next 4 for length of command section */
for(int i = 0; i < 4; i++)
init_bools[i] = data[i/8] & (1 << (i % 8));
command_length = data[0] >> 4;
/* Leave at least one byte as input */
if(command_length >= size - 1 - CONFIG_LENGTH)
command_length = size - 1 - CONFIG_LENGTH;
/* Dump decoder input to file */
{
FILE * file_to_decode = fopen("/tmp/tmp.flac","w");
fwrite(data+CONFIG_LENGTH+command_length,1,size-CONFIG_LENGTH-command_length,file_to_decode);
fclose(file_to_decode);
}
ogg = init_bools[0];
FLAC__stream_decoder_set_md5_checking(decoder,init_bools[1]);
if(init_bools[2])
FLAC__stream_decoder_set_metadata_respond_all(decoder);
if(init_bools[3])
FLAC__stream_decoder_set_metadata_ignore_all(decoder);
/* initialize decoder */
if(decoder_valid) {
FLAC__StreamDecoderInitStatus init_status;
if(ogg)
init_status = FLAC__stream_decoder_init_ogg_file(decoder, "/tmp/tmp.flac", write_callback, NULL, error_callback, NULL);
else
init_status = FLAC__stream_decoder_init_file(decoder, "/tmp/tmp.flac", write_callback, NULL, error_callback, NULL);
if(init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
decoder_valid = false;
}
}
/* Run commands */
for(uint8_t i = 0; decoder_valid && (i < command_length); i++){
const uint8_t * command = data+CONFIG_LENGTH+i;
uint8_t shift = 1u << (command[0] >> 3);
FLAC__uint64 seekpos;
switch(command[0] & 7){
case 0:
FPRINTF_DEBUG_ONLY(stderr,"end_of_stream\n");
decoder_valid = FLAC__stream_decoder_process_until_end_of_stream(decoder);
break;
case 1:
FPRINTF_DEBUG_ONLY(stderr,"end_of_metadata\n");
decoder_valid = FLAC__stream_decoder_process_until_end_of_metadata(decoder);
break;
case 2:
FPRINTF_DEBUG_ONLY(stderr,"single\n");
decoder_valid = FLAC__stream_decoder_process_single(decoder);
break;
case 3:
FPRINTF_DEBUG_ONLY(stderr,"skip_single\n");
decoder_valid = FLAC__stream_decoder_skip_single_frame(decoder);
break;
case 4:
FPRINTF_DEBUG_ONLY(stderr,"reset\n");
decoder_valid = FLAC__stream_decoder_reset(decoder);
break;
case 5:
FPRINTF_DEBUG_ONLY(stderr,"flush\n");
decoder_valid = FLAC__stream_decoder_flush(decoder);
break;
case 6:
shift = 1u << (command[0] >> 3);
FPRINTF_DEBUG_ONLY(stderr,"seek short %hhu\n",shift);
decoder_valid = FLAC__stream_decoder_seek_absolute(decoder,shift);
break;
case 7:
if(i+8 >= command_length) /* Not enough data available to do this */
break;
seekpos = ((FLAC__uint64)command[1] << 56) +
((FLAC__uint64)command[2] << 48) +
((FLAC__uint64)command[3] << 40) +
((FLAC__uint64)command[4] << 32) +
((FLAC__uint64)command[5] << 24) +
((FLAC__uint64)command[6] << 16) +
((FLAC__uint64)command[7] << 8) +
command[8];
i+=8;
FPRINTF_DEBUG_ONLY(stderr,"seek long %lu\n",seekpos);
decoder_valid = FLAC__stream_decoder_seek_absolute(decoder,seekpos);
break;
}
}
FLAC__stream_decoder_finish(decoder);
FLAC__stream_decoder_delete(decoder);
return 0;
}
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