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Diffstat (limited to 'src/common/ioutils.h')
-rw-r--r-- | src/common/ioutils.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/src/common/ioutils.h b/src/common/ioutils.h new file mode 100644 index 0000000..f17c961 --- /dev/null +++ b/src/common/ioutils.h @@ -0,0 +1,81 @@ +// * This file is part of the COLOBOT source code +// * Copyright (C) 2012, Polish Portal of Colobot (PPC) +// * +// * 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://www.gnu.org/licenses/. + +// ioutils.h + +#pragma once + + +#include <iostream> + + +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((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((char*)&byte, 1); + value |= byte << (i*8); + } + return value; +} + +//! 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. */ +void WriteBinaryFloat(float value, std::ostream &ostr) +{ + unsigned int iValue = *( (unsigned int*)( (void*)(&value) ) ); + IOUtils::WriteBinary<4, unsigned int>(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. */ +float ReadBinaryFloat(std::istream &istr) +{ + unsigned int iValue = IOUtils::ReadBinary<4, unsigned int>(istr); + float result = *( (float*)( (void*)(&iValue) ) ); + return result; +} + +}; // namespace IOUtils |