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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "common/quiche_data_writer.h"
#include <algorithm>
#include <limits>
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "common/quiche_endian.h"
namespace quiche {
QuicheDataWriter::QuicheDataWriter(size_t size, char* buffer)
: QuicheDataWriter(size, buffer, quiche::NETWORK_BYTE_ORDER) {}
QuicheDataWriter::QuicheDataWriter(size_t size,
char* buffer,
quiche::Endianness endianness)
: buffer_(buffer), capacity_(size), length_(0), endianness_(endianness) {}
QuicheDataWriter::~QuicheDataWriter() {}
char* QuicheDataWriter::data() {
return buffer_;
}
bool QuicheDataWriter::WriteUInt8(uint8_t value) {
return WriteBytes(&value, sizeof(value));
}
bool QuicheDataWriter::WriteUInt16(uint16_t value) {
if (endianness_ == quiche::NETWORK_BYTE_ORDER) {
value = quiche::QuicheEndian::HostToNet16(value);
}
return WriteBytes(&value, sizeof(value));
}
bool QuicheDataWriter::WriteUInt32(uint32_t value) {
if (endianness_ == quiche::NETWORK_BYTE_ORDER) {
value = quiche::QuicheEndian::HostToNet32(value);
}
return WriteBytes(&value, sizeof(value));
}
bool QuicheDataWriter::WriteUInt64(uint64_t value) {
if (endianness_ == quiche::NETWORK_BYTE_ORDER) {
value = quiche::QuicheEndian::HostToNet64(value);
}
return WriteBytes(&value, sizeof(value));
}
bool QuicheDataWriter::WriteBytesToUInt64(size_t num_bytes, uint64_t value) {
if (num_bytes > sizeof(value)) {
return false;
}
if (endianness_ == quiche::HOST_BYTE_ORDER) {
return WriteBytes(&value, num_bytes);
}
value = quiche::QuicheEndian::HostToNet64(value);
return WriteBytes(reinterpret_cast<char*>(&value) + sizeof(value) - num_bytes,
num_bytes);
}
bool QuicheDataWriter::WriteStringPiece16(absl::string_view val) {
if (val.size() > std::numeric_limits<uint16_t>::max()) {
return false;
}
if (!WriteUInt16(static_cast<uint16_t>(val.size()))) {
return false;
}
return WriteBytes(val.data(), val.size());
}
bool QuicheDataWriter::WriteStringPiece(absl::string_view val) {
return WriteBytes(val.data(), val.size());
}
char* QuicheDataWriter::BeginWrite(size_t length) {
if (length_ > capacity_) {
return nullptr;
}
if (capacity_ - length_ < length) {
return nullptr;
}
#ifdef ARCH_CPU_64_BITS
DCHECK_LE(length, std::numeric_limits<uint32_t>::max());
#endif
return buffer_ + length_;
}
bool QuicheDataWriter::WriteBytes(const void* data, size_t data_len) {
char* dest = BeginWrite(data_len);
if (!dest) {
return false;
}
memcpy(dest, data, data_len);
length_ += data_len;
return true;
}
bool QuicheDataWriter::WriteRepeatedByte(uint8_t byte, size_t count) {
char* dest = BeginWrite(count);
if (!dest) {
return false;
}
memset(dest, byte, count);
length_ += count;
return true;
}
void QuicheDataWriter::WritePadding() {
DCHECK_LE(length_, capacity_);
if (length_ > capacity_) {
return;
}
memset(buffer_ + length_, 0x00, capacity_ - length_);
length_ = capacity_;
}
bool QuicheDataWriter::WritePaddingBytes(size_t count) {
return WriteRepeatedByte(0x00, count);
}
bool QuicheDataWriter::WriteTag(uint32_t tag) {
return WriteBytes(&tag, sizeof(tag));
}
bool QuicheDataWriter::Seek(size_t length) {
if (!BeginWrite(length)) {
return false;
}
length_ += length;
return true;
}
std::string QuicheDataWriter::DebugString() const {
return absl::StrCat(" { capacity: ", capacity_, ", length: ", length_, " }");
}
} // namespace quiche