/* Copyright (C) 2004-2005 Cory Nelson This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution. */ // namespaces added by Arvid Norberg #ifndef __UTF8_H__ #define __UTF8_H__ #include #include #include namespace libtorrent { namespace detail { template wchar_t decode_utf8_mb(InputIterator &iter, InputIterator last) { if (iter == last) throw std::runtime_error("incomplete UTF-8 sequence"); if (((*iter) & 0xc0) != 0x80) throw std::runtime_error("invalid UTF-8 sequence"); return (wchar_t)((*iter++) & 0x3f); } template wchar_t decode_utf8(InputIterator &iter, InputIterator last) { wchar_t ret; if (((*iter) & 0x80) == 0) // one byte { ret = *iter++; } else if (((*iter) & 0xe0) == 0xc0) // two bytes { wchar_t byte1 = (*iter++) & 0x1f; wchar_t byte2 = decode_utf8_mb(iter, last); ret = (byte1 << 6) | byte2; } else if (((*iter) & 0xf0) == 0xe0) // three bytes { wchar_t byte1 = (*iter++) & 0x0f; wchar_t byte2 = decode_utf8_mb(iter, last); wchar_t byte3 = decode_utf8_mb(iter, last); ret = (byte1 << 12) | (byte2 << 6) | byte3; } // TODO: support surrogate pairs else throw std::runtime_error("UTF-8 not convertable to UTF-16"); return ret; } template OutputIterator utf8_wchar(InputIterator first, InputIterator last, OutputIterator dest) { for(; first!=last; ++dest) *dest = decode_utf8(first, last); return dest; } template void encode_wchar(InputIterator iter, OutputIterator &dest) { if(*iter <= 0x007F) { *dest=(char)*iter; ++dest; } else if(*iter <= 0x07FF) { *dest = (char)( 0xC0 | ((*iter & 0x07C0) >> 6) ); ++dest; *dest = (char)( 0x80 | (*iter & 0x003F) ); ++dest; } else if(*iter <= 0xFFFF) { *dest = (char)( 0xE0 | ((*iter & 0xF000) >> 12) ); ++dest; *dest = (char)( 0x80 | ((*iter & 0x0FC0) >> 6) ); ++dest; *dest = (char)( 0x80 | (*iter & 0x003F) ); ++dest; } } template OutputIterator wchar_utf8(InputIterator first, InputIterator last, OutputIterator dest) { for(; first!=last; ++first) encode_wchar(first, dest); return dest; } } inline void utf8_wchar(const std::string &utf8, std::wstring &wide) { wide.clear(); detail::utf8_wchar(utf8.begin(), utf8.end(), std::insert_iterator(wide, wide.end())); } inline std::wstring utf8_wchar(const std::string &str) { std::wstring ret; utf8_wchar(str, ret); return ret; } inline void wchar_utf8(const std::wstring &wide, std::string &utf8) { utf8.clear(); detail::wchar_utf8(wide.begin(), wide.end(), std::insert_iterator(utf8, utf8.end())); } inline std::string wchar_utf8(const std::wstring &str) { std::string ret; wchar_utf8(str, ret); return ret; } } #endif