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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.
//
#include "shill/net/byte_string.h"
#include <netinet/in.h>
#include <string.h>
#include <algorithm>
#include <base/strings/string_number_conversions.h>
using std::min;
using std::string;
using std::vector;
namespace shill {
ByteString::ByteString(const ByteString& b) {
data_ = b.data_;
}
ByteString& ByteString::operator=(const ByteString& b) {
data_ = b.data_;
return *this;
}
unsigned char* ByteString::GetData() {
return (GetLength() == 0) ? nullptr : &data_.front();
}
const unsigned char* ByteString::GetConstData() const {
return (GetLength() == 0) ? nullptr : &data_.front();
}
size_t ByteString::GetLength() const {
return data_.size();
}
ByteString ByteString::GetSubstring(size_t offset, size_t length) const {
if (offset > GetLength()) {
offset = GetLength();
}
if (length > GetLength() - offset) {
length = GetLength() - offset;
}
return ByteString(GetConstData() + offset, length);
}
// static
ByteString ByteString::CreateFromCPUUInt32(uint32_t val) {
return ByteString(reinterpret_cast<unsigned char*>(&val), sizeof(val));
}
// static
ByteString ByteString::CreateFromNetUInt32(uint32_t val) {
return CreateFromCPUUInt32(ntohl(val));
}
// static
ByteString ByteString::CreateFromHexString(const string& hex_string) {
vector<uint8_t> bytes;
if (!base::HexStringToBytes(hex_string, &bytes)) {
return ByteString();
}
return ByteString(&bytes.front(), bytes.size());
}
bool ByteString::ConvertToCPUUInt32(uint32_t* val) const {
if (val == nullptr || GetLength() != sizeof(*val)) {
return false;
}
memcpy(val, GetConstData(), sizeof(*val));
return true;
}
bool ByteString::ConvertToNetUInt32(uint32_t* val) const {
if (!ConvertToCPUUInt32(val)) {
return false;
}
*val = ntohl(*val);
return true;
}
template <typename T>
bool ByteString::ConvertByteOrderAsUIntArray(T (*converter)(T)) {
size_t length = GetLength();
if ((length % sizeof(T)) != 0) {
return false;
}
for (auto i = data_.begin(); i != data_.end(); i += sizeof(T)) {
// Take care of word alignment.
T val;
memcpy(&val, &(*i), sizeof(T));
val = converter(val);
memcpy(&(*i), &val, sizeof(T));
}
return true;
}
bool ByteString::ConvertFromNetToCPUUInt32Array() {
return ConvertByteOrderAsUIntArray(ntohl);
}
bool ByteString::ConvertFromCPUToNetUInt32Array() {
return ConvertByteOrderAsUIntArray(htonl);
}
bool ByteString::IsZero() const {
for (const auto& i : data_) {
if (i != 0) {
return false;
}
}
return true;
}
bool ByteString::BitwiseAnd(const ByteString& b) {
if (GetLength() != b.GetLength()) {
return false;
}
auto lhs = data_.begin();
for (const auto& rhs : b.data_) {
*lhs++ &= rhs;
}
return true;
}
bool ByteString::BitwiseOr(const ByteString& b) {
if (GetLength() != b.GetLength()) {
return false;
}
auto lhs = data_.begin();
for (const auto& rhs : b.data_) {
*lhs++ |= rhs;
}
return true;
}
void ByteString::BitwiseInvert() {
for (auto& i : data_) {
i = ~i;
}
}
bool ByteString::Equals(const ByteString& b) const {
if (GetLength() != b.GetLength()) {
return false;
}
auto lhs = data_.begin();
for (const auto& rhs : b.data_) {
if (*lhs++ != rhs) {
return false;
}
}
return true;
}
void ByteString::Append(const ByteString& b) {
data_.insert(data_.end(), b.data_.begin(), b.data_.end());
}
void ByteString::Clear() {
data_.clear();
}
void ByteString::Resize(int size) {
data_.resize(size, 0);
}
string ByteString::HexEncode() const {
return base::HexEncode(GetConstData(), GetLength());
}
bool ByteString::CopyData(size_t size, void* output) const {
if (output == nullptr || GetLength() < size) {
return false;
}
memcpy(output, GetConstData(), size);
return true;
}
// static
bool ByteString::IsLessThan(const ByteString& lhs, const ByteString& rhs) {
size_t byte_count = min(lhs.GetLength(), rhs.GetLength());
int result = memcmp(lhs.GetConstData(), rhs.GetConstData(), byte_count);
if (result == 0) {
return lhs.GetLength() < rhs.GetLength();
}
return result < 0;
}
} // namespace shill
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