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#include "DataStream.hpp"
#include <bit>
#include <limits>
#include <utility>
static_assert(std::numeric_limits<float>::is_iec559, "Non IEE754/IEC559 'float' is not supported.");
static_assert(std::numeric_limits<double>::is_iec559, "Non IEE754/IEC559 'double' is not supported.");
static_assert(std::endian::native == std::endian::little || std::endian::native == std::endian::big, "Mixed endian is not supported.");
// Reading/writing signed integer byte-by-byte is fine, since the representation got fixed to 2's complements in C++20
static uint16_t ByteSwap(uint16_t n)
{
auto bytes = reinterpret_cast<std::byte*>(n);
std::swap(bytes[0], bytes[1]);
return n;
}
static uint32_t ByteSwap(uint32_t n)
{
#ifdef _MSC_VER
// TODO
#else
return __builtin_bswap32(n);
#endif
}
static uint64_t ByteSwap(uint64_t n)
{
#ifdef _MSC_VER
// TODO
#else
return __builtin_bswap64(n);
#endif
}
template <class TSigned>
static TSigned ByteSwap(TSigned n)
{
using Unsigned = std::make_unsigned_t<TSigned>;
auto swapped = ::ByteSwap(std::bit_cast<Unsigned>(n));
return std::bit_cast<TSigned>(swapped);
}
std::endian BaseDataStream::GetEndianness() const
{
return mEndian;
}
void BaseDataStream::SetEndianness(std::endian endianness)
{
mEndian = endianness;
}
InputDataStream::InputDataStream(std::fstream stream)
: mBackend{ std::move(stream) }
{
}
void InputDataStream::ReadBytes(size_t byteCount, std::byte* buffer)
{
mBackend.read(reinterpret_cast<char*>(buffer), static_cast<std::streamsize>(byteCount));
}
void InputDataStream::ReadBytes(size_t byteCount, char* buffer)
{
mBackend.read(reinterpret_cast<char*>(buffer), static_cast<std::streamsize>(byteCount));
}
void InputDataStream::ReadBytes(size_t byteCount, signed char* buffer)
{
mBackend.read(reinterpret_cast<char*>(buffer), static_cast<std::streamsize>(byteCount));
}
void InputDataStream::ReadBytes(size_t byteCount, unsigned char* buffer)
{
mBackend.read(reinterpret_cast<char*>(buffer), static_cast<std::streamsize>(byteCount));
}
void InputDataStream::Read(int8_t& n)
{
// sizeof() of a reference type yields the size of the reference
mBackend.read(reinterpret_cast<char*>(&n), sizeof(n));
}
void InputDataStream::Read(int16_t& n)
{
int16_t tmp;
mBackend.read(reinterpret_cast<char*>(&tmp), sizeof(tmp));
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(tmp);
} else {
n = tmp;
}
}
void InputDataStream::Read(int32_t& n)
{
int32_t tmp;
mBackend.read(reinterpret_cast<char*>(&tmp), sizeof(tmp));
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(tmp);
} else {
n = tmp;
}
}
void InputDataStream::Read(int64_t& n)
{
int64_t tmp;
mBackend.read(reinterpret_cast<char*>(&tmp), sizeof(tmp));
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(tmp);
} else {
n = tmp;
}
}
void InputDataStream::Read(uint8_t& n)
{
mBackend.read(reinterpret_cast<char*>(&n), sizeof(n));
}
void InputDataStream::Read(uint16_t& n)
{
uint16_t tmp;
mBackend.read(reinterpret_cast<char*>(&tmp), sizeof(tmp));
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(tmp);
} else {
n = tmp;
}
}
void InputDataStream::Read(uint32_t& n)
{
uint32_t tmp;
mBackend.read(reinterpret_cast<char*>(&tmp), sizeof(tmp));
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(tmp);
} else {
n = tmp;
}
}
void InputDataStream::Read(uint64_t& n)
{
uint64_t tmp;
mBackend.read(reinterpret_cast<char*>(&tmp), sizeof(tmp));
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(tmp);
} else {
n = tmp;
}
}
void InputDataStream::Read(float& n)
{
uint32_t buffer;
Read(buffer);
if (GetEndianness() != std::endian::native) {
buffer = ::ByteSwap(buffer);
}
n = std::bit_cast<float>(buffer);
}
void InputDataStream::Read(double& n)
{
uint64_t buffer;
Read(buffer);
if (GetEndianness() != std::endian::native) {
buffer = ::ByteSwap(buffer);
}
n = std::bit_cast<double>(buffer);
}
OutputDataStream::OutputDataStream(std::fstream stream)
: mBackend{ std::move(stream) }
{
}
void OutputDataStream::WriteBytes(size_t byteCount, const std::byte* buffer)
{
mBackend.write(reinterpret_cast<const char*>(buffer), static_cast<std::streamsize>(byteCount));
}
void OutputDataStream::WriteBytes(size_t byteCount, const char* buffer)
{
mBackend.write(reinterpret_cast<const char*>(buffer), static_cast<std::streamsize>(byteCount));
}
void OutputDataStream::WriteBytes(size_t byteCount, const signed char* buffer)
{
mBackend.write(reinterpret_cast<const char*>(buffer), static_cast<std::streamsize>(byteCount));
}
void OutputDataStream::WriteBytes(size_t byteCount, const unsigned char* buffer)
{
mBackend.write(reinterpret_cast<const char*>(buffer), static_cast<std::streamsize>(byteCount));
}
void OutputDataStream::Write(int8_t n)
{
mBackend.write(reinterpret_cast<const char*>(&n), sizeof(n));
}
void OutputDataStream::Write(int16_t n)
{
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(n);
}
mBackend.write(reinterpret_cast<const char*>(&n), sizeof(n));
}
void OutputDataStream::Write(int32_t n)
{
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(n);
}
mBackend.write(reinterpret_cast<const char*>(&n), sizeof(n));
}
void OutputDataStream::Write(int64_t n)
{
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(n);
}
mBackend.write(reinterpret_cast<const char*>(&n), sizeof(n));
}
void OutputDataStream::Write(uint8_t n)
{
mBackend.write(reinterpret_cast<const char*>(&n), sizeof(n));
}
void OutputDataStream::Write(uint16_t n)
{
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(n);
}
mBackend.write(reinterpret_cast<const char*>(&n), sizeof(n));
}
void OutputDataStream::Write(uint32_t n)
{
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(n);
}
mBackend.write(reinterpret_cast<const char*>(&n), sizeof(n));
}
void OutputDataStream::Write(uint64_t n)
{
if (GetEndianness() != std::endian::native) {
n = ::ByteSwap(n);
}
mBackend.write(reinterpret_cast<const char*>(&n), sizeof(n));
}
void OutputDataStream::Write(float n)
{
auto buffer = std::bit_cast<uint32_t>(n);
if (GetEndianness() != std::endian::native) {
buffer = ::ByteSwap(buffer);
}
mBackend.read(reinterpret_cast<char*>(&buffer), sizeof(buffer));
}
void OutputDataStream::Write(double n)
{
auto buffer = std::bit_cast<uint64_t>(n);
if (GetEndianness() != std::endian::native) {
buffer = ::ByteSwap(buffer);
}
mBackend.read(reinterpret_cast<char*>(&buffer), sizeof(buffer));
}
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