1 /******************************************************************************
2 *
3 * Copyright (C) 2020 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 *****************************************************************************
18 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
19 */
20 #include <stdint.h>
21 #include <string.h>
22 #include <algorithm>
23
24 #include "gsm.h"
25
26 constexpr size_t kGsmInNumSamples = 160;
27 constexpr size_t kGsmInBufferSize = kGsmInNumSamples * sizeof(gsm_signal);
28
29 enum { IDX_VERBOSITY, IDX_FAST, IDX_LTP_CUT, IDX_WAV49, IDX_LAST };
30
31 class Codec {
32 public:
33 Codec() = default;
~Codec()34 ~Codec() { deInitEncoder(); }
35 bool initEncoder();
36 void encodeFrames(uint8_t *data, size_t size);
37 void deInitEncoder();
38
39 private:
40 gsm mGsm = nullptr;
41 };
42
initEncoder()43 bool Codec::initEncoder() {
44 mGsm = gsm_create();
45 return mGsm ? true : false;
46 }
47
encodeFrames(uint8_t * data,size_t size)48 void Codec::encodeFrames(uint8_t *data, size_t size) {
49 int32_t verbosity = data[IDX_VERBOSITY] & 0x01;
50 int32_t fast = data[IDX_FAST] & 0x01;
51 int32_t ltp_cut = data[IDX_LTP_CUT] & 0x01;
52 int32_t wav49 = data[IDX_WAV49] & 0x01;
53 gsm_option(mGsm, GSM_OPT_VERBOSE, &verbosity);
54 gsm_option(mGsm, GSM_OPT_FAST, &fast);
55 gsm_option(mGsm, GSM_OPT_LTP_CUT, <p_cut);
56 gsm_option(mGsm, GSM_OPT_WAV49, &wav49);
57 data += IDX_LAST;
58 size -= IDX_LAST;
59
60 while (size > 0) {
61 gsm_signal tmpData[kGsmInNumSamples];
62 gsm_frame out;
63 size_t frameSize = std::min(size, kGsmInBufferSize);
64
65 memcpy(tmpData, data, frameSize);
66 if (frameSize < kGsmInBufferSize) {
67 memset(reinterpret_cast<uint8_t *>(tmpData) + frameSize, data[0],
68 kGsmInBufferSize - frameSize);
69 }
70 gsm_encode(mGsm, tmpData, out);
71 data += frameSize;
72 size -= frameSize;
73 }
74 }
75
deInitEncoder()76 void Codec::deInitEncoder() {
77 if (mGsm) {
78 gsm_destroy(mGsm);
79 mGsm = nullptr;
80 }
81 }
82
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)83 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
84 if (size < IDX_LAST) {
85 return 0;
86 }
87 Codec *codec = new Codec();
88 if (!codec) {
89 return 0;
90 }
91 if (codec->initEncoder()) {
92 codec->encodeFrames(const_cast<uint8_t *>(data), size);
93 }
94 delete codec;
95 return 0;
96 }
97