1 /*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "decoded/raw_data_decoder.h"
17
18 #include "securec.h"
19
20 namespace OHOS {
21 namespace HiviewDFX {
22 namespace EventRaw {
FloatingNumberDecoded(uint8_t * rawData,const size_t maxLen,size_t & pos,double & dest)23 bool RawDataDecoder::FloatingNumberDecoded(uint8_t* rawData, const size_t maxLen, size_t& pos, double& dest)
24 {
25 if (rawData == nullptr || pos >= maxLen) {
26 return false;
27 }
28 uint64_t valByteCnt = 0; // default 0
29 if (!UnsignedVarintDecoded(rawData, maxLen, pos, valByteCnt)) {
30 return false;
31 }
32 if ((pos + valByteCnt) > maxLen) {
33 return false;
34 }
35 if (valByteCnt == sizeof(float)) {
36 float tmpf;
37 if (memcpy_s(reinterpret_cast<uint8_t*>(&tmpf), valByteCnt, rawData + pos, valByteCnt) != EOK) {
38 return false;
39 }
40 dest = static_cast<double>(tmpf);
41 } else if (valByteCnt == sizeof(double)) {
42 double tmpd;
43 if (memcpy_s(reinterpret_cast<uint8_t*>(&tmpd), valByteCnt, rawData + pos, valByteCnt) != EOK) {
44 return false;
45 }
46 dest = tmpd;
47 } else {
48 return false;
49 }
50 pos += valByteCnt;
51 return true;
52 }
53
SignedVarintDecoded(uint8_t * rawData,const size_t maxLen,size_t & pos,int64_t & dest)54 bool RawDataDecoder::SignedVarintDecoded(uint8_t* rawData, const size_t maxLen, size_t& pos, int64_t& dest)
55 {
56 if (rawData == nullptr || pos >= maxLen) {
57 return false;
58 }
59 uint64_t uval = 0;
60 if (!UnsignedVarintDecoded(rawData, maxLen, pos, uval)) {
61 return false;
62 }
63 // unzigzag
64 dest = (uval >> 1) ^ -static_cast<int64_t>(uval & 1);
65 return true;
66 }
67
StringValueDecoded(uint8_t * rawData,const size_t maxLen,size_t & pos,std::string & dest)68 bool RawDataDecoder::StringValueDecoded(uint8_t* rawData, const size_t maxLen, size_t& pos, std::string& dest)
69 {
70 if (rawData == nullptr || pos >= maxLen) {
71 return false;
72 }
73 uint64_t valByteCnt = 0; // default 0
74 if (!UnsignedVarintDecoded(rawData, maxLen, pos, valByteCnt) ||
75 valByteCnt > maxLen || // for value flip
76 ((pos + valByteCnt) > maxLen)) {
77 return false;
78 }
79 if (valByteCnt == 0) { // no need to copy
80 return true;
81 }
82 dest = std::string(reinterpret_cast<char*>(rawData + pos), valByteCnt);
83 pos += valByteCnt;
84 return true;
85 }
86
UnsignedVarintDecoded(uint8_t * rawData,const size_t maxLen,size_t & pos,uint64_t & dest)87 bool RawDataDecoder::UnsignedVarintDecoded(uint8_t* rawData, const size_t maxLen, size_t& pos, uint64_t& dest)
88 {
89 if (rawData == nullptr || pos >= maxLen) {
90 return false;
91 }
92 uint64_t val = rawData[pos] & TAG_BYTE_MASK;
93 uint32_t offset = TAG_BYTE_OFFSET;
94 if ((pos + 1) > maxLen) {
95 return false;
96 }
97 if (rawData[pos++] & TAG_BYTE_BOUND) {
98 do {
99 if (pos >= maxLen) {
100 return false;
101 }
102 val |= (static_cast<uint64_t>(rawData[pos] & NON_TAG_BYTE_MASK) << offset);
103 offset += NON_TAG_BYTE_OFFSET;
104 } while (rawData[pos++] & NON_TAG_BYTE_BOUND);
105 }
106 dest = val;
107 return true;
108 }
109
ValueTypeDecoded(uint8_t * rawData,const size_t maxLen,size_t & pos,struct ParamValueType & dest)110 bool RawDataDecoder::ValueTypeDecoded(uint8_t* rawData, const size_t maxLen, size_t& pos,
111 struct ParamValueType& dest)
112 {
113 if (rawData == nullptr || pos >= maxLen) {
114 return false;
115 }
116 if ((pos + sizeof(struct ParamValueType)) > maxLen) {
117 return false;
118 }
119 dest = *(reinterpret_cast<struct ParamValueType*>(rawData + pos));
120 pos += sizeof(struct ParamValueType);
121 return true;
122 }
123 } // namespace EventRaw
124 } // namespace HiviewDFX
125 } // namespace OHOS