70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
/*
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* Copyright 2017 WebAssembly Community Group participants
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef WABT_LEB128_H_
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#define WABT_LEB128_H_
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#include <cstdint>
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#include "wabt/common.h"
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namespace wabt {
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class Stream;
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// Returns the length of the leb128.
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Offset U32Leb128Length(uint32_t value);
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void WriteU32Leb128(Stream* stream, uint32_t value, const char* desc);
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void WriteS32Leb128(Stream* stream, uint32_t value, const char* desc);
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void WriteU64Leb128(Stream* stream, uint64_t value, const char* desc);
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void WriteS64Leb128(Stream* stream, uint64_t value, const char* desc);
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void WriteFixedS32Leb128(Stream* stream, uint32_t value, const char* desc);
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void WriteFixedU32Leb128(Stream* stream, uint32_t value, const char* desc);
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Offset WriteU32Leb128At(Stream* stream,
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Offset offset,
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uint32_t value,
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const char* desc);
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Offset WriteFixedU32Leb128At(Stream* stream,
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Offset offset,
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uint32_t value,
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const char* desc);
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Offset WriteU32Leb128Raw(uint8_t* data, uint8_t* end, uint32_t value);
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Offset WriteFixedU32Leb128Raw(uint8_t* data, uint8_t* end, uint32_t value);
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// Convenience functions for writing enums as LEB128s.
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template <typename T>
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void WriteU32Leb128(Stream* stream, T value, const char* desc) {
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WriteU32Leb128(stream, static_cast<uint32_t>(value), desc);
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}
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template <typename T>
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void WriteS32Leb128(Stream* stream, T value, const char* desc) {
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WriteS32Leb128(stream, static_cast<uint32_t>(value), desc);
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}
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// Returns the length of the leb128.
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size_t ReadU32Leb128(const uint8_t* p, const uint8_t* end, uint32_t* out_value);
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size_t ReadU64Leb128(const uint8_t* p, const uint8_t* end, uint64_t* out_value);
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size_t ReadS32Leb128(const uint8_t* p, const uint8_t* end, uint32_t* out_value);
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size_t ReadS64Leb128(const uint8_t* p, const uint8_t* end, uint64_t* out_value);
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} // namespace wabt
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#endif // WABT_LEB128_H_
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