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/******************************************************************************
*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
#include <stdlib.h>
#include <utils/String8.h>
#include "FLAC/stream_decoder.h"
// First four bytes are always "fLaC" in ASCII format.
#define FIRST_ENCODED_BYTE_OFFSET 4
class Codec {
public:
Codec() = default;
~Codec() { deInitDecoder(); }
bool initDecoder();
void decodeFrames(const uint8_t *data, size_t size);
void deInitDecoder();
private:
FLAC__StreamDecoder *mDecoder = nullptr;
const uint8_t *mBuffer = nullptr;
size_t mBufferLen = 0;
size_t mBufferPos = 0;
FLAC__StreamDecoderReadStatus readCallback(FLAC__byte buffer[], size_t *bytes);
FLAC__StreamDecoderWriteStatus writeCallback(const FLAC__Frame *frame,
const FLAC__int32 *const buffer[]);
void errorCallback(FLAC__StreamDecoderErrorStatus status);
void metadataCallback(const FLAC__StreamMetadata *metadata);
};
bool Codec::initDecoder() {
mDecoder = FLAC__stream_decoder_new();
if (!mDecoder) {
return false;
}
FLAC__stream_decoder_set_metadata_ignore_all(mDecoder);
FLAC__stream_decoder_set_md5_checking(mDecoder, true);
// read_callback, write_callback, error_callback and metadata_callback cannot be nullptrs
static auto read_callback = [](const FLAC__StreamDecoder *, FLAC__byte buffer[], size_t *bytes,
void *client_data) -> FLAC__StreamDecoderReadStatus {
Codec *client = reinterpret_cast<Codec *>(client_data);
return client->readCallback(buffer, bytes);
};
static auto write_callback = [](const FLAC__StreamDecoder *, const FLAC__Frame *frame,
const FLAC__int32 *const buffer[],
void *client_data) -> FLAC__StreamDecoderWriteStatus {
Codec *client = reinterpret_cast<Codec *>(client_data);
return client->writeCallback(frame, buffer);
};
static auto error_callback = [](const FLAC__StreamDecoder *,
FLAC__StreamDecoderErrorStatus status, void *client_data) {
Codec *client = reinterpret_cast<Codec *>(client_data);
client->errorCallback(status);
};
FLAC__stream_decoder_set_metadata_respond(mDecoder, FLAC__METADATA_TYPE_STREAMINFO);
static auto metadata_callback = [](const FLAC__StreamDecoder *,
const FLAC__StreamMetadata *metadata, void *client_data) {
Codec *client = reinterpret_cast<Codec *>(client_data);
client->metadataCallback(metadata);
};
void *client_data = reinterpret_cast<void *>(this);
FLAC__StreamDecoderInitStatus initStatus = FLAC__stream_decoder_init_stream(
mDecoder, read_callback, nullptr, nullptr, nullptr, nullptr, write_callback,
metadata_callback, error_callback, client_data);
if (initStatus != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
return false;
}
return true;
}
FLAC__StreamDecoderReadStatus Codec::readCallback(FLAC__byte buffer[], size_t *bytes) {
if (!mBuffer || mBufferLen == 0) {
*bytes = 0;
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
}
size_t bytesRequested = *bytes;
if (bytesRequested > mBufferLen - mBufferPos) {
bytesRequested = mBufferLen - mBufferPos;
}
memcpy(buffer, mBuffer + mBufferPos, bytesRequested);
mBufferPos += bytesRequested;
*bytes = bytesRequested;
return (bytesRequested == 0 ? FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM
: FLAC__STREAM_DECODER_READ_STATUS_CONTINUE);
}
FLAC__StreamDecoderWriteStatus Codec::writeCallback(const FLAC__Frame *frame,
const FLAC__int32 *const buffer[]) {
(void)frame;
(void)buffer;
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
void Codec::errorCallback(FLAC__StreamDecoderErrorStatus status) {
(void)status;
return;
}
void Codec::metadataCallback(const FLAC__StreamMetadata *metadata) {
(void)metadata;
return;
}
void Codec::decodeFrames(const uint8_t *data, size_t size) {
mBuffer = data;
mBufferLen = size;
size_t ofst = std::min((size_t)FIRST_ENCODED_BYTE_OFFSET, size - 1);
bool decodeEntireStream = data[ofst] & 0x01;
if (!decodeEntireStream) {
if (!FLAC__stream_decoder_process_until_end_of_metadata(mDecoder)) {
return;
}
while (mBufferPos <= size) {
FLAC__stream_decoder_process_single(mDecoder);
if (FLAC__STREAM_DECODER_END_OF_STREAM == FLAC__stream_decoder_get_state(mDecoder)) {
return;
}
}
} else {
FLAC__stream_decoder_process_until_end_of_stream(mDecoder);
}
FLAC__stream_decoder_finish(mDecoder);
}
void Codec::deInitDecoder() {
if (mDecoder != nullptr) {
FLAC__stream_decoder_delete(mDecoder);
}
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
if (size == 0) {
return 0;
}
Codec *codec = new Codec();
if (!codec) {
return 0;
}
if (codec->initDecoder()) {
codec->decodeFrames(data, size);
}
delete codec;
return 0;
}
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