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129 lines
2.7 KiB
C++
129 lines
2.7 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/big_endian.h"
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#include "base/numerics/checked_math.h"
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#include "base/strings/string_piece.h"
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namespace base {
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BigEndianReader::BigEndianReader(const char* buf, size_t len)
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: ptr_(buf), end_(ptr_ + len) {}
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bool BigEndianReader::Skip(size_t len) {
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if (ptr_ + len > end_)
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return false;
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ptr_ += len;
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return true;
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}
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bool BigEndianReader::ReadBytes(void* out, size_t len) {
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if (ptr_ + len > end_)
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return false;
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memcpy(out, ptr_, len);
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ptr_ += len;
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return true;
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}
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bool BigEndianReader::ReadPiece(base::StringPiece* out, size_t len) {
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if (ptr_ + len > end_)
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return false;
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*out = base::StringPiece(ptr_, len);
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ptr_ += len;
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return true;
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}
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template<typename T>
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bool BigEndianReader::Read(T* value) {
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if (ptr_ + sizeof(T) > end_)
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return false;
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ReadBigEndian<T>(ptr_, value);
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ptr_ += sizeof(T);
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return true;
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}
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bool BigEndianReader::ReadU8(uint8_t* value) {
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return Read(value);
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}
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bool BigEndianReader::ReadU16(uint16_t* value) {
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return Read(value);
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}
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bool BigEndianReader::ReadU32(uint32_t* value) {
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return Read(value);
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}
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bool BigEndianReader::ReadU64(uint64_t* value) {
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return Read(value);
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}
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template <typename T>
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bool BigEndianReader::ReadLengthPrefixed(base::StringPiece* out) {
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T t_len;
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if (!Read(&t_len))
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return false;
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size_t len = strict_cast<size_t>(t_len);
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const char* original_ptr = ptr_;
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if (!Skip(len)) {
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ptr_ -= sizeof(T);
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return false;
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}
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*out = base::StringPiece(original_ptr, len);
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return true;
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}
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bool BigEndianReader::ReadU8LengthPrefixed(base::StringPiece* out) {
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return ReadLengthPrefixed<uint8_t>(out);
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}
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bool BigEndianReader::ReadU16LengthPrefixed(base::StringPiece* out) {
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return ReadLengthPrefixed<uint16_t>(out);
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}
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BigEndianWriter::BigEndianWriter(char* buf, size_t len)
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: ptr_(buf), end_(ptr_ + len) {}
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bool BigEndianWriter::Skip(size_t len) {
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if (ptr_ + len > end_)
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return false;
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ptr_ += len;
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return true;
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}
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bool BigEndianWriter::WriteBytes(const void* buf, size_t len) {
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if (ptr_ + len > end_)
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return false;
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memcpy(ptr_, buf, len);
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ptr_ += len;
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return true;
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}
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template<typename T>
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bool BigEndianWriter::Write(T value) {
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if (ptr_ + sizeof(T) > end_)
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return false;
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WriteBigEndian<T>(ptr_, value);
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ptr_ += sizeof(T);
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return true;
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}
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bool BigEndianWriter::WriteU8(uint8_t value) {
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return Write(value);
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}
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bool BigEndianWriter::WriteU16(uint16_t value) {
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return Write(value);
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}
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bool BigEndianWriter::WriteU32(uint32_t value) {
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return Write(value);
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}
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bool BigEndianWriter::WriteU64(uint64_t value) {
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return Write(value);
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}
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} // namespace base
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