西安美国应用材料公司:从宽字符转换到UTF8的代码

[代码] cpp代码

/*Copyright (C) 2004-2005 Cory NelsonThis software is provided 'as-is', without any express or impliedwarranty.  In no event will the authors be held liable for any damagesarising 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 itfreely, subject to the following restrictions:1. The origin of this software must not be misrepresented; you must notclaim that you wrote the original software. If you use this softwarein a product, an acknowledgment in the product documentation would beappreciated but is not required.2. Altered source versions must be plainly marked as such, and must not bemisrepresented 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 #include namespace detail {templatewchar_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);}templatewchar_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 pairselse throw std::runtime_error("UTF-8 not convertable to UTF-16");return ret;}templateOutputIterator utf8_wchar(InputIterator first, InputIterator last, OutputIterator dest){for(; first!=last; ++dest)*dest = decode_utf8(first, last);return dest;}templatevoid 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;}}templateOutputIterator 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::back_inserter(wide));}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::back_inserter(utf8));}inline std::string wchar_utf8(const std::wstring &str){std::string ret;wchar_utf8(str, ret);return ret;}#endif // __UTF8_H__