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/*
* This file is part of the Colobot: Gold Edition source code
* Copyright (C) 2001-2023, Daniel Roux, EPSITEC SA & TerranovaTeam
* http://epsitec.ch; http://colobot.info; http://github.com/colobot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://gnu.org/licenses
*/
/**
* \file common/ioutils.h
* \brief Functions for binary I/O
*/
#pragma once
#include <iostream>
#include <cstring>
namespace IOUtils
{
//! Writes a binary number to output stream
/**
* \c T is a numeric type (int, unsigned int, etc.)
* \c N is number of bytes
* Write order is little-endian
*/
template<int N, typename T>
void WriteBinary(T value, std::ostream &ostr)
{
for (int i = 0; i < N; ++i)
{
unsigned char byte = (value >> (i*8)) & 0xFF;
ostr.write(reinterpret_cast<char*>(&byte), 1);
}
}
//! Reads a binary number from input stream
/**
* \c T is a numeric type (int, unsigned int, etc.)
* \c N is number of bytes
* Read order is little-endian
*/
template<int N, typename T>
T ReadBinary(std::istream &istr)
{
T value = 0;
for (int i = 0; i < N; ++i)
{
unsigned char byte = 0;
istr.read(reinterpret_cast<char*>(&byte), 1);
value |= byte << (i*8);
}
return value;
}
//! Writes a binary 1-byte boolean
/**
* false is 0; true is 1.
*/
inline void WriteBinaryBool(bool value, std::ostream &ostr)
{
unsigned char v = value ? 1 : 0;
IOUtils::WriteBinary<1, unsigned char>(v, ostr);
}
//! Reads a binary 1-byte boolean
/**
* 0 is false; other values are true.
*/
inline bool ReadBinaryBool(std::istream &istr)
{
int v = IOUtils::ReadBinary<1, unsigned char>(istr);
return v != 0;
}
//! Writes a binary 32-bit float to output stream
/**
* Write order is little-endian
* NOTE: code is probably not portable as there are platforms with other float representations.
*/
inline void WriteBinaryFloat(float value, std::ostream &ostr)
{
union FloatCast
{
float fValue;
unsigned int iValue;
};
FloatCast u;
u.fValue = 0.0f;
u.iValue = 0;
u.fValue = value;
IOUtils::WriteBinary<4, unsigned int>(u.iValue, ostr);
}
//! Reads a binary 32-bit float from input stream
/**
* Read order is little-endian
* NOTE: code is probably not portable as there are platforms with other float representations.
*/
inline float ReadBinaryFloat(std::istream &istr)
{
union FloatCast
{
float fValue;
unsigned int iValue;
};
FloatCast u;
u.fValue = 0.0f;
u.iValue = 0;
u.iValue = IOUtils::ReadBinary<4, unsigned int>(istr);
return u.fValue;
}
//! Writes a variable binary string to output stream
/**
* The string is written by first writing string length
* in \c N byte binary number and then the string bytes.
*/
template<int N>
void WriteBinaryString(const std::string &value, std::ostream &ostr)
{
int length = value.size();
WriteBinary<N, int>(length, ostr);
for (int i = 0; i < length; ++i)
ostr.put(value[i]);
}
//! Reads a variable binary string from output stream
/**
* The string is read by first reading string length
* in \c N byte binary number and then the string bytes.
*/
template<int N>
std::string ReadBinaryString(std::istream &istr)
{
int length = ReadBinary<N, int>(istr);
std::string str;
char c = 0;
for (int i = 0; i < length; ++i)
{
istr.read(&c, 1);
str += c;
}
return str;
}
} // namespace IOUtils
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