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99 lines
2.7 KiB
99 lines
2.7 KiB
/******************************************************************************
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*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#include <stdint.h>
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#include <string.h>
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#include "gsm.h"
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constexpr int16_t kGsmInFrameSize = 33;
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constexpr int16_t kGsmInFrameSizeMinus1 = kGsmInFrameSize - 1;
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constexpr int16_t kGsmOutFrameSize = 160;
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constexpr int16_t kGsmTotalInFrameSize = (kGsmInFrameSize + kGsmInFrameSizeMinus1);
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constexpr int16_t kGsmTotalOutFrameSize = (kGsmOutFrameSize * 2);
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class Codec {
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public:
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Codec() = default;
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~Codec() { deInitDecoder(); }
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bool initDecoder();
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void decodeFrames(const uint8_t *data, size_t size);
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void deInitDecoder();
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private:
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gsm mGsm = nullptr;
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};
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bool Codec::initDecoder() {
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mGsm = gsm_create();
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if (mGsm) {
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int msopt = 1;
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gsm_option(mGsm, GSM_OPT_WAV49, &msopt);
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return true;
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} else {
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return false;
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}
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}
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void Codec::decodeFrames(const uint8_t *data, size_t size) {
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uint8_t firstByte = *data;
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int32_t verbosity = firstByte & 0x01;
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int32_t fast = (firstByte >> 1) & 0x01;
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gsm_option(mGsm, GSM_OPT_VERBOSE, &verbosity);
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gsm_option(mGsm, GSM_OPT_FAST, &fast);
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gsm_byte *readPointer = const_cast<uint8_t *>(data);
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uint8_t tmpData[kGsmTotalInFrameSize];
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gsm_signal out[kGsmTotalOutFrameSize];
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while (size > 0) {
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if (size < kGsmTotalInFrameSize) {
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memset(tmpData, 0, sizeof(tmpData));
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memcpy(tmpData, data, size);
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size = kGsmTotalInFrameSize;
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readPointer = tmpData;
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}
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gsm_decode(mGsm, readPointer, out);
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readPointer += kGsmInFrameSize;
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size -= kGsmInFrameSize;
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gsm_decode(mGsm, readPointer, out);
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readPointer += kGsmInFrameSizeMinus1;
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size -= kGsmInFrameSizeMinus1;
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}
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}
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void Codec::deInitDecoder() {
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gsm_destroy(mGsm);
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mGsm = nullptr;
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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if (size < 1) {
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return 0;
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}
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Codec *codec = new Codec();
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if (!codec) {
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return 0;
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}
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if (codec->initDecoder()) {
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codec->decodeFrames(data, size);
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}
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delete codec;
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return 0;
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}
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