119 lines
2.4 KiB
C++
119 lines
2.4 KiB
C++
/*
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* misc_util.cpp
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* -------------
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* Purpose: Various useful utility functions.
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* Notes : (currently none)
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* Authors: OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#include "stdafx.h"
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#include "misc_util.h"
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OPENMPT_NAMESPACE_BEGIN
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namespace Util
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{
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static constexpr mpt::uchar EncodeNibble[16] = {
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UC_('0'), UC_('1'), UC_('2'), UC_('3'),
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UC_('4'), UC_('5'), UC_('6'), UC_('7'),
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UC_('8'), UC_('9'), UC_('A'), UC_('B'),
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UC_('C'), UC_('D'), UC_('E'), UC_('F') };
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static inline bool DecodeByte(uint8 &byte, mpt::uchar c1, mpt::uchar c2)
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{
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byte = 0;
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if(UC_('0') <= c1 && c1 <= UC_('9'))
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{
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byte += static_cast<uint8>((c1 - UC_('0')) << 4);
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} else if(UC_('A') <= c1 && c1 <= UC_('F'))
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{
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byte += static_cast<uint8>((c1 - UC_('A') + 10) << 4);
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} else if(UC_('a') <= c1 && c1 <= UC_('f'))
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{
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byte += static_cast<uint8>((c1 - UC_('a') + 10) << 4);
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} else
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{
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return false;
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}
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if(UC_('0') <= c2 && c2 <= UC_('9'))
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{
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byte += static_cast<uint8>(c2 - UC_('0'));
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} else if(UC_('A') <= c2 && c2 <= UC_('F'))
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{
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byte += static_cast<uint8>(c2 - UC_('A') + 10);
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} else if(UC_('a') <= c2 && c2 <= UC_('f'))
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{
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byte += static_cast<uint8>(c2 - UC_('a') + 10);
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} else
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{
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return false;
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}
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return true;
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}
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mpt::ustring BinToHex(mpt::const_byte_span src)
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{
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mpt::ustring result;
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result.reserve(src.size() * 2);
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for(std::byte byte : src)
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{
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result.push_back(EncodeNibble[(mpt::byte_cast<uint8>(byte) & 0xf0) >> 4]);
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result.push_back(EncodeNibble[mpt::byte_cast<uint8>(byte) & 0x0f]);
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}
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return result;
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}
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std::vector<std::byte> HexToBin(const mpt::ustring &src)
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{
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std::vector<std::byte> result;
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result.reserve(src.size() / 2);
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for(std::size_t i = 0; (i + 1) < src.size(); i += 2)
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{
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uint8 byte = 0;
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if(!DecodeByte(byte, src[i], src[i + 1]))
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{
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return result;
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}
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result.push_back(mpt::byte_cast<std::byte>(byte));
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}
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return result;
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}
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} // namespace Util
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#if defined(MODPLUG_TRACKER) || (defined(LIBOPENMPT_BUILD) && defined(LIBOPENMPT_BUILD_TEST))
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namespace mpt
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{
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std::string getenv(const std::string &env_var, const std::string &def)
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{
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#if MPT_OS_WINDOWS && MPT_OS_WINDOWS_WINRT
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MPT_UNREFERENCED_PARAMETER(env_var);
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return def;
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#else
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const char *val = std::getenv(env_var.c_str());
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if(!val)
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{
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return def;
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}
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return val;
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#endif
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}
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} // namespace mpt
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#endif // MODPLUG_TRACKER || (LIBOPENMPT_BUILD && LIBOPENMPT_BUILD_TEST)
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OPENMPT_NAMESPACE_END
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