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/* fuzzer_encoder_v2
* 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_encoder.h"
#include "FLAC/metadata.h"
extern "C" {
#include "share/private.h"
}
/* This C++ fuzzer uses the FLAC and not FLAC++ because the latter lacks a few
* hidden functions like FLAC__stream_encoder_disable_constant_subframes. It
* is still processed by a C++ compiler because that's what oss-fuzz expects */
static FLAC__StreamEncoderWriteStatus write_callback(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, uint32_t samples, uint32_t current_frame, void *client_data)
{
(void)encoder, (void)buffer, (void)bytes, (void)samples, (void)current_frame, (void)client_data;
return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
{
FLAC__bool encoder_valid = true;
FLAC__StreamEncoder *encoder = 0;
FLAC__StreamMetadata *metadata[16] = {NULL};
unsigned num_metadata = 0;
FLAC__StreamMetadata_VorbisComment_Entry VorbisCommentField;
unsigned sample_rate, channels, bps;
uint64_t samples_estimate;
unsigned compression_level, input_data_width, blocksize, max_lpc_order, qlp_coeff_precision, min_residual_partition_order, max_residual_partition_order, metadata_mask, instruction_set_disable_mask;
FLAC__bool ogg, write_to_file, interleaved;
FLAC__bool data_bools[24];
/* allocate the encoder */
if((encoder = FLAC__stream_encoder_new()) == NULL) {
fprintf(stderr, "ERROR: allocating encoder\n");
return 1;
}
/* Use first 20 byte for configuration */
if(size < 20){
FLAC__stream_encoder_delete(encoder);
return 0;
}
/* First 3 byte for sample rate, 4th byte for channels, 5th byte for bps */
sample_rate = ((unsigned)data[0] << 16) + ((unsigned)data[1] << 8) + data[2];
channels = data[3];
bps = data[4];
/* Number of samples estimate, format accepts 36-bit max */
samples_estimate = ((uint64_t)data[5] << 32) + ((unsigned)data[6] << 24) + ((unsigned)data[7] << 16) + ((unsigned)data[8] << 8) + data[9];
compression_level = data[10]&0b1111;
input_data_width = 1 + (data[10]>>4)%4;
blocksize = ((unsigned)data[11] << 8) + (unsigned)data[12];
max_lpc_order = data[13];
qlp_coeff_precision = data[14];
min_residual_partition_order = data[15] & 0b1111;
max_residual_partition_order = data[15] & 0b11110000;
metadata_mask = data[16];
instruction_set_disable_mask = data[17];
/* Get array of bools from configuration */
for(int i = 0; i < 16; i++)
data_bools[i] = data[18+i/8] & (1 << (i % 8));
ogg = data_bools[0];
interleaved = data_bools[1];
write_to_file = data_bools[13];
/* Set input and process parameters */
encoder_valid &= FLAC__stream_encoder_set_verify(encoder, data_bools[2]);
encoder_valid &= FLAC__stream_encoder_set_channels(encoder, channels);
encoder_valid &= FLAC__stream_encoder_set_bits_per_sample(encoder, bps);
encoder_valid &= FLAC__stream_encoder_set_sample_rate(encoder, sample_rate);
encoder_valid &= FLAC__stream_encoder_set_total_samples_estimate(encoder, samples_estimate);
encoder_valid &= FLAC__stream_encoder_disable_instruction_set(encoder, instruction_set_disable_mask);
/* Set compression related parameters */
encoder_valid &= FLAC__stream_encoder_set_compression_level(encoder, compression_level);
if(data_bools[3]){
/* Bias towards regular compression levels */
encoder_valid &= FLAC__stream_encoder_set_streamable_subset(encoder, data_bools[4]);
encoder_valid &= FLAC__stream_encoder_set_blocksize(encoder, blocksize);
encoder_valid &= FLAC__stream_encoder_set_max_lpc_order(encoder, max_lpc_order);
encoder_valid &= FLAC__stream_encoder_set_qlp_coeff_precision(encoder, qlp_coeff_precision);
encoder_valid &= FLAC__stream_encoder_set_min_residual_partition_order(encoder, min_residual_partition_order);
encoder_valid &= FLAC__stream_encoder_set_max_residual_partition_order(encoder, max_residual_partition_order);
if(size < (1 << 18)) {
/* The following three options are **slow**, and when combined with a large input
* make fuzzers timeout, so only enable them on reasonably sized inputs. 2^17 is taken
* because that is the maximum blocksize * 4 (32-bit input)
*/
encoder_valid &= FLAC__stream_encoder_set_do_qlp_coeff_prec_search(encoder, data_bools[5]);
encoder_valid &= FLAC__stream_encoder_set_do_escape_coding(encoder, data_bools[6]);
encoder_valid &= FLAC__stream_encoder_set_do_exhaustive_model_search(encoder, data_bools[7]);
}
encoder_valid &= FLAC__stream_encoder_set_do_mid_side_stereo(encoder, data_bools[8]);
encoder_valid &= FLAC__stream_encoder_set_loose_mid_side_stereo(encoder, data_bools[9]);
encoder_valid &= FLAC__stream_encoder_disable_constant_subframes(encoder, data_bools[10]);
encoder_valid &= FLAC__stream_encoder_disable_fixed_subframes(encoder, data_bools[11]);
encoder_valid &= FLAC__stream_encoder_disable_verbatim_subframes(encoder, data_bools[12]);
}
/* data_bools[14..15] are spare */
/* add metadata */
if(encoder_valid && (metadata_mask & 1)) {
if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_STREAMINFO)) == NULL)
encoder_valid = false;
else
num_metadata++;
}
if(encoder_valid && (metadata_mask & 2) && size > 21){
if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL)
encoder_valid = false;
else {
metadata[num_metadata++]->length = (((unsigned)data[20]) << 8) + (unsigned)(data[21]);
}
}
if(encoder_valid && (metadata_mask & 4) && size > 20){
FLAC__byte * application_data = (FLAC__byte *)malloc(size-20);
if(0 != application_data && ((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_APPLICATION)) == NULL))
encoder_valid = false;
else {
memcpy(application_data,data+20,size-20);
FLAC__metadata_object_application_set_data(metadata[num_metadata++], application_data, size-20, 0);
}
}
if(encoder_valid && (metadata_mask & 8) && size > 25){
if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_SEEKTABLE)) == NULL)
encoder_valid = false;
else {
unsigned seekpoint_spacing = ((unsigned)data[22] << 8) + data[23];
unsigned total_samples_for_seekpoints = ((unsigned)data[24] << 8) + data[25];
FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(metadata[num_metadata++], seekpoint_spacing, total_samples_for_seekpoints);
}
}
if(encoder_valid && (metadata_mask & 16)){
if((metadata[num_metadata] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL)
encoder_valid = false;
else {
/* Append a vorbis comment */
if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&VorbisCommentField, "COMMENTARY", "Nothing to 🤔 report"))
encoder_valid = false;
else {
FLAC__metadata_object_vorbiscomment_append_comment(metadata[num_metadata], VorbisCommentField, false);
/* Insert a vorbis comment at the first index */
if(!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&VorbisCommentField, "COMMENTARY", "Still nothing to report 🤔🤣"))
encoder_valid = false;
else
FLAC__metadata_object_vorbiscomment_insert_comment(metadata[num_metadata++], 0, VorbisCommentField, false);
}
}
}
if(num_metadata && encoder_valid)
encoder_valid = FLAC__stream_encoder_set_metadata(encoder, metadata, num_metadata);
/* initialize encoder */
if(encoder_valid) {
FLAC__StreamEncoderInitStatus init_status;
if(ogg)
if(write_to_file)
init_status = FLAC__stream_encoder_init_ogg_file(encoder, "/tmp/tmp.flac", NULL, NULL);
else
init_status = FLAC__stream_encoder_init_ogg_stream(encoder, NULL, write_callback, NULL, NULL, NULL, NULL);
else
if(write_to_file)
init_status = FLAC__stream_encoder_init_file(encoder, "/tmp/tmp.flac", NULL, NULL);
else
init_status = FLAC__stream_encoder_init_stream(encoder, write_callback, NULL, NULL, NULL, NULL);
if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
encoder_valid = false;
}
}
/* send samples to encoder */
if(encoder_valid && size > (input_data_width*channels+26)) {
unsigned samples = (size - 26)/input_data_width/channels;
const uint8_t * pcm_data = data + 26;
int32_t * data_as_int32 = (int32_t *)malloc(4*samples*channels);
if(0 != data_as_int32){
for(unsigned i = 0; i < samples*channels; i++)
if(input_data_width == 1)
data_as_int32[i] = (int32_t)pcm_data[i] - 0x80;
else if(input_data_width == 2)
data_as_int32[i] = (((int32_t)pcm_data[i*2] << 8) + pcm_data[i*2+1]) - 0x8000;
else if(input_data_width == 3)
data_as_int32[i] = (((int32_t)pcm_data[i*3] << 16) + ((int32_t)pcm_data[i*3+1] << 8) + pcm_data[i*3+2]) - 0x800000;
else if(input_data_width == 4)
data_as_int32[i] = (((int64_t)pcm_data[i*4] << 24) + ((int32_t)pcm_data[i*4+1] << 16) + ((int32_t)pcm_data[i*4+2] << 8) + pcm_data[i*4+3]) - 0x80000000;
/* feed samples to encoder */
if(interleaved)
encoder_valid = FLAC__stream_encoder_process_interleaved(encoder, data_as_int32, samples);
else {
encoder_valid = FLAC__stream_encoder_process(encoder, (const int32_t*[]){data_as_int32,
data_as_int32+samples,
data_as_int32+samples*2,
data_as_int32+samples*3,
data_as_int32+samples*4, data_as_int32+samples*5, data_as_int32+samples*6, data_as_int32+samples*7}, samples);
}
free(data_as_int32);
}
else {
encoder_valid = false;
}
}
if(FLAC__stream_encoder_get_state(encoder) != FLAC__STREAM_ENCODER_OK &&
FLAC__stream_encoder_get_state(encoder) != FLAC__STREAM_ENCODER_UNINITIALIZED &&
FLAC__stream_encoder_get_state(encoder) != FLAC__STREAM_ENCODER_CLIENT_ERROR){
fprintf(stderr,"-----\nERROR: stream encoder returned %s\n-----\n",FLAC__stream_encoder_get_resolved_state_string(encoder));
abort();
}
FLAC__stream_encoder_finish(encoder);
/* now that encoding is finished, the metadata can be freed */
for(unsigned i = 0; i < 16; i++)
if(0 != metadata[i])
FLAC__metadata_object_delete(metadata[i]);
FLAC__stream_encoder_delete(encoder);
return 0;
}
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