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/mem/dyn_chunk.h"
17
18#include "securec.h"
19
20namespace panda::ecmascript {
21int DynChunk::Expand(size_t newSize)
22{
23    if (newSize > allocatedSize_) {
24        if (error_) {
25            return FAILURE;
26        }
27        ASSERT(allocatedSize_ <= std::numeric_limits<size_t>::max() / ALLOCATE_MULTIPLIER);
28        size_t size = allocatedSize_ * ALLOCATE_MULTIPLIER;
29        if (size > newSize) {
30            newSize = size;
31        }
32        newSize = std::max(newSize, ALLOCATE_MIN_SIZE);
33        auto *newBuf = chunk_->NewArray<uint8_t>(newSize);
34        if (newBuf == nullptr) {
35            error_ = true;
36            return FAILURE;
37        }
38        if (memset_s(newBuf, newSize, 0, newSize) != EOK) {
39            error_ = true;
40            return FAILURE;
41        }
42        if (buf_ != nullptr) {
43            if (memcpy_s(newBuf, size_, buf_, size_) != EOK) {
44                error_ = true;
45                return FAILURE;
46            }
47        }
48        buf_ = newBuf;
49        allocatedSize_ = newSize;
50    }
51    return SUCCESS;
52}
53
54int DynChunk::Insert(uint32_t position, size_t len)
55{
56    if (size_ < position) {
57        return FAILURE;
58    }
59    if (Expand(size_ + len) != 0) {
60        return FAILURE;
61    }
62    size_t moveSize = size_ - position;
63    // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic)
64    if (memmove_s(buf_ + position + len, moveSize, buf_ + position, moveSize) != EOK) {
65        return FAILURE;
66    }
67    size_ += len;
68    return SUCCESS;
69}
70
71int DynChunk::Emit(const uint8_t *data, size_t length)
72{
73    if (UNLIKELY((size_ + length) > allocatedSize_)) {
74        if (Expand(size_ + length) != 0) {
75            return FAILURE;
76        }
77    }
78
79    if (memcpy_s(buf_ + size_,  // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
80                 length, data, length) != EOK) {
81        return FAILURE;
82    }
83    size_ += length;
84    return SUCCESS;
85}
86
87int DynChunk::EmitChar(uint8_t c)
88{
89    return Emit(&c, 1);
90}
91
92int DynChunk::EmitSelf(size_t offset, size_t length)
93{
94    if (UNLIKELY((size_ + length) > allocatedSize_)) {
95        if (Expand(size_ + length) != 0) {
96            return FAILURE;
97        }
98    }
99
100    if (memcpy_s(buf_ + size_,  // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
101                 length,
102                 buf_ + offset,  // NOLINT(cppcoreguidelines-pro-bounds-pointer-arithmetic)
103                 length) != EOK) {
104        return FAILURE;
105    }
106    size_ += length;
107    return SUCCESS;
108}
109
110int DynChunk::EmitStr(const char *str)
111{
112    return Emit(reinterpret_cast<const uint8_t *>(str), strlen(str) + 1);
113}
114}  // namespace panda::ecmascript
115