124 lines
3.5 KiB
C++
124 lines
3.5 KiB
C++
#pragma once
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#ifndef MESSMER_CPPUTILS_DATA_DESERIALIZER_H
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#define MESSMER_CPPUTILS_DATA_DESERIALIZER_H
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#include "Data.h"
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#include "../macros.h"
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#include "../assert/assert.h"
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namespace cpputils {
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class Deserializer final {
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public:
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Deserializer(const Data *source);
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uint8_t readUint8();
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int8_t readInt8();
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uint16_t readUint16();
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int16_t readInt16();
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uint32_t readUint32();
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int32_t readInt32();
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uint64_t readUint64();
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int64_t readInt64();
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std::string readString();
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Data readData();
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Data readTailData();
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void finished();
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private:
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template<typename DataType> DataType _read();
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Data _readData(size_t size);
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size_t _pos;
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const Data *_source;
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DISALLOW_COPY_AND_ASSIGN(Deserializer);
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};
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inline Deserializer::Deserializer(const Data *source): _pos(0), _source(source) {
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}
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inline uint8_t Deserializer::readUint8() {
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return _read<uint8_t>();
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}
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inline int8_t Deserializer::readInt8() {
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return _read<int8_t>();
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}
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inline uint16_t Deserializer::readUint16() {
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return _read<uint16_t>();
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}
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inline int16_t Deserializer::readInt16() {
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return _read<int16_t>();
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}
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inline uint32_t Deserializer::readUint32() {
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return _read<uint32_t>();
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}
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inline int32_t Deserializer::readInt32() {
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return _read<int32_t>();
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}
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inline uint64_t Deserializer::readUint64() {
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return _read<uint64_t>();
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}
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inline int64_t Deserializer::readInt64() {
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return _read<int64_t>();
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}
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template<typename DataType>
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inline DataType Deserializer::_read() {
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static_assert(std::is_pod<DataType>::value, "Can only deserialize PODs");
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if (_pos + sizeof(DataType) > _source->size()) {
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throw std::runtime_error("Deserialization failed - size overflow");
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}
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DataType result = *reinterpret_cast<const DataType*>(_source->dataOffset(_pos));
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_pos += sizeof(DataType);
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return result;
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}
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inline Data Deserializer::readData() {
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uint64_t size = readUint64();
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if (_pos + size > _source->size()) {
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throw std::runtime_error("Deserialization failed - size overflow");
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}
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return _readData(size);
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}
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inline Data Deserializer::readTailData() {
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uint64_t size = _source->size() - _pos;
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return _readData(size);
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}
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inline Data Deserializer::_readData(size_t size) {
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Data result(size);
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std::memcpy(static_cast<char*>(result.data()), static_cast<const char*>(_source->dataOffset(_pos)), size);
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_pos += size;
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return result;
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}
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inline std::string Deserializer::readString() {
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//TODO Test whether that works when string ends (a) at beginning (b) in middle (c) at end of data region
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const void *nullbytepos = std::memchr(_source->dataOffset(_pos), '\0', _source->size()-_pos);
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if (nullbytepos == nullptr) {
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throw std::runtime_error("Deserialization failed - missing nullbyte for string termination");
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}
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uint64_t size = static_cast<const uint8_t*>(nullbytepos) - static_cast<const uint8_t*>(_source->dataOffset(_pos));
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std::string result(reinterpret_cast<const char*>(_source->dataOffset(_pos)), size);
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_pos += size + 1;
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return result;
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}
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inline void Deserializer::finished() {
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if (_pos != _source->size()) {
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throw std::runtime_error("Deserialization failed - size not fully used.");
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}
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}
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}
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#endif
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