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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_COMPILER_LEB128_ENCODER_H_
#define ART_COMPILER_LEB128_ENCODER_H_
#include "base/macros.h"
#include "leb128.h"
namespace art {
static inline uint8_t* EncodeUnsignedLeb128(uint8_t* dest, uint32_t value) {
uint8_t out = value & 0x7f;
value >>= 7;
while (value != 0) {
*dest++ = out | 0x80;
out = value & 0x7f;
value >>= 7;
}
*dest++ = out;
return dest;
}
static inline uint8_t* EncodeSignedLeb128(uint8_t* dest, int32_t value) {
uint32_t extra_bits = static_cast<uint32_t>(value ^ (value >> 31)) >> 6;
uint8_t out = value & 0x7f;
while (extra_bits != 0u) {
*dest++ = out | 0x80;
value >>= 7;
out = value & 0x7f;
extra_bits >>= 7;
}
*dest++ = out;
return dest;
}
// An encoder with an API similar to vector<uint32_t> where the data is captured in ULEB128 format.
class Leb128EncodingVector {
public:
Leb128EncodingVector() {
}
void Reserve(uint32_t size) {
data_.reserve(size);
}
void PushBackUnsigned(uint32_t value) {
uint8_t out = value & 0x7f;
value >>= 7;
while (value != 0) {
data_.push_back(out | 0x80);
out = value & 0x7f;
value >>= 7;
}
data_.push_back(out);
}
template<typename It>
void InsertBackUnsigned(It cur, It end) {
for (; cur != end; ++cur) {
PushBackUnsigned(*cur);
}
}
void PushBackSigned(int32_t value) {
uint32_t extra_bits = static_cast<uint32_t>(value ^ (value >> 31)) >> 6;
uint8_t out = value & 0x7f;
while (extra_bits != 0u) {
data_.push_back(out | 0x80);
value >>= 7;
out = value & 0x7f;
extra_bits >>= 7;
}
data_.push_back(out);
}
template<typename It>
void InsertBackSigned(It cur, It end) {
for (; cur != end; ++cur) {
PushBackSigned(*cur);
}
}
const std::vector<uint8_t>& GetData() const {
return data_;
}
private:
std::vector<uint8_t> data_;
DISALLOW_COPY_AND_ASSIGN(Leb128EncodingVector);
};
} // namespace art
#endif // ART_COMPILER_LEB128_ENCODER_H_
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