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GeezerVison is showing github.com — log/src/code_conversion.cpp at develop · boostorg/log Expand file tree/ Copy pathcode_conversion.cppMore file actions 311 lines (259 loc) · 12 KB / Copy pathcode_conversion.cppFile metadata and controls311 lines (259 loc) · 12 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 /* * Copyright Andrey Semashev 2007 - 2015. * Distributed under the Boost Software License, Version 1.0. * (See accompanying file LICENSE_1_0.txt or copy at * http://www.boost.org/LICENSE_1_0.txt) */ /*! * \file code_conversion.cpp * \author Andrey Semashev * \date 08.11.2008 * * \brief This header is the Boost.Log library implementation, see the library documentation * at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html. */ #include <boost/log/detail/config.hpp> #include <cstddef> #include <locale> #include <string> #include <stdexcept> #include <algorithm> #include <boost/log/exceptions.hpp> #include <boost/log/detail/code_conversion.hpp> #if defined(BOOST_WINDOWS) #include <cstring> #include <limits> #include <boost/winapi/get_last_error.hpp> #include <boost/winapi/character_code_conversion.hpp> #endif #include <boost/log/detail/header.hpp> namespace boost { BOOST_LOG_OPEN_NAMESPACE namespace aux { BOOST_LOG_ANONYMOUS_NAMESPACE { //! The function performs character conversion with the specified facet template< typename LocalCharT > inline std::codecvt_base::result convert( std::codecvt< LocalCharT, char, std::mbstate_t > const& fac, std::mbstate_t& state, const char*& pSrcBegin, const char* pSrcEnd, LocalCharT*& pDstBegin, LocalCharT* pDstEnd) { return fac.in(state, pSrcBegin, pSrcEnd, pSrcBegin, pDstBegin, pDstEnd, pDstBegin); } //! The function performs character conversion with the specified facet template< typename LocalCharT > inline std::codecvt_base::result convert( std::codecvt< LocalCharT, char, std::mbstate_t > const& fac, std::mbstate_t& state, const LocalCharT*& pSrcBegin, const LocalCharT* pSrcEnd, char*& pDstBegin, char* pDstEnd) { return fac.out(state, pSrcBegin, pSrcEnd, pSrcBegin, pDstBegin, pDstEnd, pDstBegin); } } // namespace #if defined(BOOST_MSVC) #pragma warning(push) // conversion from 'X' to 'Y', possible loss of data // This warning is triggered for the noconv case below, where we convert wchar_t to char if the locale facet // reports that no code conversion is needed. In such a case, no data loss will happen. #pragma warning(disable: 4244) #endif template< typename SourceCharT, typename TargetCharT, typename FacetT > inline std::size_t code_convert(const SourceCharT* begin, const SourceCharT* end, std::basic_string< TargetCharT >& converted, std::size_t max_size, FacetT const& fac) { typedef typename FacetT::state_type state_type; TargetCharT converted_buffer[256]; const SourceCharT* const original_begin = begin; state_type state = state_type(); std::size_t buf_size = (std::min)(max_size, sizeof(converted_buffer) / sizeof(*converted_buffer)); while (begin != end && buf_size > 0u) { TargetCharT* dest = converted_buffer; std::codecvt_base::result res = convert( fac, state, begin, end, dest, dest + buf_size); switch (res) { case std::codecvt_base::ok: // All characters were successfully converted // NOTE: MSVC 11 also returns ok when the source buffer was only partially consumed, so we also check that the begin pointer has reached the end. converted.append(converted_buffer, dest); max_size -= dest - converted_buffer; break; case std::codecvt_base::noconv: { // Not possible, unless both character types are actually equivalent const std::size_t size = (std::min)(max_size, static_cast< std::size_t >(end - begin)); converted.append(begin, begin + size); begin += size; max_size -= size; } goto done; case std::codecvt_base::partial: // Some characters were converted, some were not if (dest != converted_buffer) { // Some conversion took place, so it seems like // the destination buffer might not have been long enough converted.append(converted_buffer, dest); max_size -= dest - converted_buffer; // ...and go on for the next part break; } else { // Nothing was converted if (begin == end) goto done; // Looks like the tail of the source buffer contains only part of the last character. // In this case we intentionally fall through to throw an exception. } BOOST_FALLTHROUGH; default: // std::codecvt_base::error BOOST_LOG_THROW_DESCR(conversion_error, "Could not convert character encoding"); } buf_size = (std::min)(max_size, sizeof(converted_buffer) / sizeof(*converted_buffer)); } done: return static_cast< std::size_t >(begin - original_begin); } #if defined(BOOST_MSVC) #pragma warning(pop) #endif //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const wchar_t* str1, std::size_t len, std::string& str2, std::size_t max_size, std::locale const& loc) { return code_convert(str1, str1 + len, str2, max_size, std::use_facet< std::codecvt< wchar_t, char, std::mbstate_t > >(loc)) == len; } //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char* str1, std::size_t len, std::wstring& str2, std::size_t max_size, std::locale const& loc) { return code_convert(str1, str1 + len, str2, max_size, std::use_facet< std::codecvt< wchar_t, char, std::mbstate_t > >(loc)) == len; } #if !defined(BOOST_LOG_NO_CXX11_CODECVT_FACETS) #if !defined(BOOST_NO_CXX11_CHAR16_T) //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char16_t* str1, std::size_t len, std::string& str2, std::size_t max_size, std::locale const& loc) { return code_convert(str1, str1 + len, str2, max_size, std::use_facet< std::codecvt< char16_t, char, std::mbstate_t > >(loc)) == len; } //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char* str1, std::size_t len, std::u16string& str2, std::size_t max_size, std::locale const& loc) { return code_convert(str1, str1 + len, str2, max_size, std::use_facet< std::codecvt< char16_t, char, std::mbstate_t > >(loc)) == len; } //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char16_t* str1, std::size_t len, std::wstring& str2, std::size_t max_size, std::locale const& loc) { std::string temp_str; code_convert(str1, str1 + len, temp_str, temp_str.max_size(), std::use_facet< std::codecvt< char16_t, char, std::mbstate_t > >(loc)); const std::size_t temp_size = temp_str.size(); return code_convert(temp_str.c_str(), temp_str.c_str() + temp_size, str2, max_size, std::use_facet< std::codecvt< wchar_t, char, std::mbstate_t > >(loc)) == temp_size; } #endif #if !defined(BOOST_NO_CXX11_CHAR32_T) //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char32_t* str1, std::size_t len, std::string& str2, std::size_t max_size, std::locale const& loc) { return code_convert(str1, str1 + len, str2, max_size, std::use_facet< std::codecvt< char32_t, char, std::mbstate_t > >(loc)) == len; } //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char* str1, std::size_t len, std::u32string& str2, std::size_t max_size, std::locale const& loc) { return code_convert(str1, str1 + len, str2, max_size, std::use_facet< std::codecvt< char32_t, char, std::mbstate_t > >(loc)) == len; } //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char32_t* str1, std::size_t len, std::wstring& str2, std::size_t max_size, std::locale const& loc) { std::string temp_str; code_convert(str1, str1 + len, temp_str, temp_str.max_size(), std::use_facet< std::codecvt< char32_t, char, std::mbstate_t > >(loc)); const std::size_t temp_size = temp_str.size(); return code_convert(temp_str.c_str(), temp_str.c_str() + temp_size, str2, max_size, std::use_facet< std::codecvt< wchar_t, char, std::mbstate_t > >(loc)) == temp_size; } #endif #if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_CHAR32_T) //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char16_t* str1, std::size_t len, std::u32string& str2, std::size_t max_size, std::locale const& loc) { std::string temp_str; code_convert(str1, str1 + len, temp_str, temp_str.max_size(), std::use_facet< std::codecvt< char16_t, char, std::mbstate_t > >(loc)); const std::size_t temp_size = temp_str.size(); return code_convert(temp_str.c_str(), temp_str.c_str() + temp_size, str2, max_size, std::use_facet< std::codecvt< char32_t, char, std::mbstate_t > >(loc)) == temp_size; } //! The function converts one string to the character type of another BOOST_LOG_API bool code_convert_impl(const char32_t* str1, std::size_t len, std::u16string& str2, std::size_t max_size, std::locale const& loc) { std::string temp_str; code_convert(str1, str1 + len, temp_str, temp_str.max_size(), std::use_facet< std::codecvt< char32_t, char, std::mbstate_t > >(loc)); const std::size_t temp_size = temp_str.size(); return code_convert(temp_str.c_str(), temp_str.c_str() + temp_size, str2, max_size, std::use_facet< std::codecvt< char16_t, char, std::mbstate_t > >(loc)) == temp_size; } #endif #endif // !defined(BOOST_LOG_NO_CXX11_CODECVT_FACETS) #if defined(BOOST_WINDOWS) //! Converts UTF-8 to UTF-16 std::wstring utf8_to_utf16(const char* str) { std::size_t utf8_len = std::strlen(str); if (utf8_len == 0) return std::wstring(); else if (BOOST_UNLIKELY(utf8_len > static_cast< std::size_t >((std::numeric_limits< int >::max)()))) BOOST_LOG_THROW_DESCR(bad_alloc, "UTF-8 string too long"); int len = boost::winapi::MultiByteToWideChar(boost::winapi::CP_UTF8_, boost::winapi::MB_ERR_INVALID_CHARS_, str, static_cast< int >(utf8_len), NULL, 0); if (BOOST_LIKELY(len > 0)) { std::wstring wstr; wstr.resize(len); len = boost::winapi::MultiByteToWideChar(boost::winapi::CP_UTF8_, boost::winapi::MB_ERR_INVALID_CHARS_, str, static_cast< int >(utf8_len), &wstr[0], len); if (BOOST_LIKELY(len > 0)) { return wstr; } } const boost::winapi::DWORD_ err = boost::winapi::GetLastError(); BOOST_LOG_THROW_DESCR_PARAMS(system_error, "Failed to convert UTF-8 to UTF-16", (err)); BOOST_LOG_UNREACHABLE_RETURN(std::wstring()); } //! Converts UTF-16 to UTF-8 std::string utf16_to_utf8(const wchar_t* wstr) { std::size_t utf16_len = std::wcslen(wstr); if (utf16_len == 0) return std::string(); else if (BOOST_UNLIKELY(utf16_len > static_cast< std::size_t >((std::numeric_limits< int >::max)()))) BOOST_LOG_THROW_DESCR(bad_alloc, "UTF-16 string too long"); const boost::winapi::DWORD_ flags = #if BOOST_USE_WINAPI_VERSION >= BOOST_WINAPI_VERSION_WIN6 boost::winapi::WC_ERR_INVALID_CHARS_; #else 0u; #endif int len = boost::winapi::WideCharToMultiByte(boost::winapi::CP_UTF8_, flags, wstr, static_cast< int >(utf16_len), NULL, 0, NULL, NULL); if (BOOST_LIKELY(len > 0)) { std::string str; str.resize(len); len = boost::winapi::WideCharToMultiByte(boost::winapi::CP_UTF8_, flags, wstr, static_cast< int >(utf16_len), &str[0], len, NULL, NULL); if (BOOST_LIKELY(len > 0)) { return str; } } const boost::winapi::DWORD_ err = boost::winapi::GetLastError(); BOOST_LOG_THROW_DESCR_PARAMS(system_error, "Failed to convert UTF-16 to UTF-8", (err)); BOOST_LOG_UNREACHABLE_RETURN(std::string()); } #endif // defined(BOOST_WINDOWS) } // namespace aux BOOST_LOG_CLOSE_NAMESPACE // namespace log } // namespace boost #include <boost/log/detail/footer.hpp> |
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