1 /*
2 * Copyright (c) 2021 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 "ecmascript/regexp/dyn_chunk.h"
17 #include "securec.h"
18
19 namespace panda::ecmascript {
Expand(size_t newSize)20 int DynChunk::Expand(size_t newSize)
21 {
22 if (newSize > allocatedSize_) {
23 if (error_) {
24 return FAILURE;
25 }
26 ASSERT(allocatedSize_ <= std::numeric_limits<size_t>::max() / ALLOCATE_MULTIPLIER);
27 size_t size = allocatedSize_ * ALLOCATE_MULTIPLIER;
28 if (size > newSize) {
29 newSize = size;
30 }
31 newSize = std::max(newSize, ALLOCATE_MIN_SIZE);
32 auto *newBuf = chunk_->NewArray<uint8_t>(newSize);
33 if (newBuf == nullptr) {
34 error_ = true;
35 return FAILURE;
36 }
37 if (memset_s(newBuf, newSize, 0, newSize) != EOK) {
38 error_ = true;
39 return FAILURE;
40 }
41 if (buf_ != nullptr) {
42 if (memcpy_s(newBuf, size_, buf_, size_) != EOK) {
43 error_ = true;
44 return FAILURE;
45 }
46 }
47 buf_ = newBuf;
48 allocatedSize_ = newSize;
49 }
50 return SUCCESS;
51 }
52
Insert(uint32_t position,size_t len)53 int DynChunk::Insert(uint32_t position, size_t len)
54 {
55 if (size_ < position) {
56 return FAILURE;
57 }
58 if (Expand(size_ + len) != 0) {
59 return FAILURE;
60 }
61 size_t moveSize = size_ - position;
62 // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic)
63 if (memmove_s(buf_ + position + len, moveSize, buf_ + position, moveSize) != EOK) {
64 return FAILURE;
65 }
66 size_ += len;
67 return SUCCESS;
68 }
69
Emit(const uint8_t * data,size_t length)70 int DynChunk::Emit(const uint8_t *data, size_t length)
71 {
72 if (UNLIKELY((size_ + length) > allocatedSize_)) {
73 if (Expand(size_ + length) != 0) {
74 return FAILURE;
75 }
76 }
77
78 if (memcpy_s(buf_ + size_, // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
79 length, data, length) != EOK) {
80 return FAILURE;
81 }
82 size_ += length;
83 return SUCCESS;
84 }
85
EmitChar(uint8_t c)86 int DynChunk::EmitChar(uint8_t c)
87 {
88 return Emit(&c, 1);
89 }
90
EmitSelf(size_t offset,size_t length)91 int DynChunk::EmitSelf(size_t offset, size_t length)
92 {
93 if (UNLIKELY((size_ + length) > allocatedSize_)) {
94 if (Expand(size_ + length) != 0) {
95 return FAILURE;
96 }
97 }
98
99 if (memcpy_s(buf_ + size_, // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
100 length,
101 buf_ + offset, // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
102 length) != EOK) {
103 return FAILURE;
104 }
105 size_ += length;
106 return SUCCESS;
107 }
108
EmitStr(const char * str)109 int DynChunk::EmitStr(const char *str)
110 {
111 return Emit(reinterpret_cast<const uint8_t *>(str), strlen(str) + 1);
112 }
113 } // namespace panda::ecmascript
114