diff options
Diffstat (limited to '3rdParty/Boost/src/libs/detail')
-rw-r--r-- | 3rdParty/Boost/src/libs/detail/utf8_codecvt_facet.cpp | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/libs/detail/utf8_codecvt_facet.cpp b/3rdParty/Boost/src/libs/detail/utf8_codecvt_facet.cpp new file mode 100644 index 0000000..658ab6a --- /dev/null +++ b/3rdParty/Boost/src/libs/detail/utf8_codecvt_facet.cpp @@ -0,0 +1,269 @@ +/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 +// utf8_codecvt_facet.cpp + +// Copyright (c) 2001 Ronald Garcia, Indiana University (garcia@osl.iu.edu) +// Andrew Lumsdaine, Indiana University (lums@osl.iu.edu). +// Use, modification and distribution is subject to 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) + +// Please see the comments in <boost/detail/utf8_codecvt_facet.hpp> to +// learn how this file should be used. + +#include <boost/detail/utf8_codecvt_facet.hpp> + +#include <cstdlib> // for multi-byte converson routines +#include <cassert> + +#include <boost/limits.hpp> +#include <boost/config.hpp> + +// If we don't have wstring, then Unicode support +// is not available anyway, so we don't need to even +// compiler this file. This also fixes the problem +// with mingw, which can compile this file, but will +// generate link error when building DLL. +#ifndef BOOST_NO_STD_WSTRING + +BOOST_UTF8_BEGIN_NAMESPACE + +/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 +// implementation for wchar_t + +// Translate incoming UTF-8 into UCS-4 +std::codecvt_base::result utf8_codecvt_facet::do_in( + std::mbstate_t& /*state*/, + const char * from, + const char * from_end, + const char * & from_next, + wchar_t * to, + wchar_t * to_end, + wchar_t * & to_next +) const { + // Basic algorithm: The first octet determines how many + // octets total make up the UCS-4 character. The remaining + // "continuing octets" all begin with "10". To convert, subtract + // the amount that specifies the number of octets from the first + // octet. Subtract 0x80 (1000 0000) from each continuing octet, + // then mash the whole lot together. Note that each continuing + // octet only uses 6 bits as unique values, so only shift by + // multiples of 6 to combine. + while (from != from_end && to != to_end) { + + // Error checking on the first octet + if (invalid_leading_octet(*from)){ + from_next = from; + to_next = to; + return std::codecvt_base::error; + } + + // The first octet is adjusted by a value dependent upon + // the number of "continuing octets" encoding the character + const int cont_octet_count = get_cont_octet_count(*from); + const wchar_t octet1_modifier_table[] = { + 0x00, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc + }; + + // The unsigned char conversion is necessary in case char is + // signed (I learned this the hard way) + wchar_t ucs_result = + (unsigned char)(*from++) - octet1_modifier_table[cont_octet_count]; + + // Invariants : + // 1) At the start of the loop, 'i' continuing characters have been + // processed + // 2) *from points to the next continuing character to be processed. + int i = 0; + while(i != cont_octet_count && from != from_end) { + + // Error checking on continuing characters + if (invalid_continuing_octet(*from)) { + from_next = from; + to_next = to; + return std::codecvt_base::error; + } + + ucs_result *= (1 << 6); + + // each continuing character has an extra (10xxxxxx)b attached to + // it that must be removed. + ucs_result += (unsigned char)(*from++) - 0x80; + ++i; + } + + // If the buffer ends with an incomplete unicode character... + if (from == from_end && i != cont_octet_count) { + // rewind "from" to before the current character translation + from_next = from - (i+1); + to_next = to; + return std::codecvt_base::partial; + } + *to++ = ucs_result; + } + from_next = from; + to_next = to; + + // Were we done converting or did we run out of destination space? + if(from == from_end) return std::codecvt_base::ok; + else return std::codecvt_base::partial; +} + +std::codecvt_base::result utf8_codecvt_facet::do_out( + std::mbstate_t& /*state*/, + const wchar_t * from, + const wchar_t * from_end, + const wchar_t * & from_next, + char * to, + char * to_end, + char * & to_next +) const +{ + // RG - consider merging this table with the other one + const wchar_t octet1_modifier_table[] = { + 0x00, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc + }; + + wchar_t max_wchar = (std::numeric_limits<wchar_t>::max)(); + while (from != from_end && to != to_end) { + + // Check for invalid UCS-4 character + if (*from > max_wchar) { + from_next = from; + to_next = to; + return std::codecvt_base::error; + } + + int cont_octet_count = get_cont_octet_out_count(*from); + + // RG - comment this formula better + int shift_exponent = (cont_octet_count) * 6; + + // Process the first character + *to++ = static_cast<char>(octet1_modifier_table[cont_octet_count] + + (unsigned char)(*from / (1 << shift_exponent))); + + // Process the continuation characters + // Invariants: At the start of the loop: + // 1) 'i' continuing octets have been generated + // 2) '*to' points to the next location to place an octet + // 3) shift_exponent is 6 more than needed for the next octet + int i = 0; + while (i != cont_octet_count && to != to_end) { + shift_exponent -= 6; + *to++ = static_cast<char>(0x80 + ((*from / (1 << shift_exponent)) % (1 << 6))); + ++i; + } + // If we filled up the out buffer before encoding the character + if(to == to_end && i != cont_octet_count) { + from_next = from; + to_next = to - (i+1); + return std::codecvt_base::partial; + } + *from++; + } + from_next = from; + to_next = to; + // Were we done or did we run out of destination space + if(from == from_end) return std::codecvt_base::ok; + else return std::codecvt_base::partial; +} + +// How many char objects can I process to get <= max_limit +// wchar_t objects? +int utf8_codecvt_facet::do_length( + BOOST_CODECVT_DO_LENGTH_CONST std::mbstate_t &, + const char * from, + const char * from_end, + std::size_t max_limit +#if BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600)) +) const throw() +#else +) const +#endif +{ + // RG - this code is confusing! I need a better way to express it. + // and test cases. + + // Invariants: + // 1) last_octet_count has the size of the last measured character + // 2) char_count holds the number of characters shown to fit + // within the bounds so far (no greater than max_limit) + // 3) from_next points to the octet 'last_octet_count' before the + // last measured character. + int last_octet_count=0; + std::size_t char_count = 0; + const char* from_next = from; + // Use "<" because the buffer may represent incomplete characters + while (from_next+last_octet_count <= from_end && char_count <= max_limit) { + from_next += last_octet_count; + last_octet_count = (get_octet_count(*from_next)); + ++char_count; + } + return static_cast<int>(from_next-from_end); +} + +unsigned int utf8_codecvt_facet::get_octet_count( + unsigned char lead_octet +){ + // if the 0-bit (MSB) is 0, then 1 character + if (lead_octet <= 0x7f) return 1; + + // Otherwise the count number of consecutive 1 bits starting at MSB +// assert(0xc0 <= lead_octet && lead_octet <= 0xfd); + + if (0xc0 <= lead_octet && lead_octet <= 0xdf) return 2; + else if (0xe0 <= lead_octet && lead_octet <= 0xef) return 3; + else if (0xf0 <= lead_octet && lead_octet <= 0xf7) return 4; + else if (0xf8 <= lead_octet && lead_octet <= 0xfb) return 5; + else return 6; +} +BOOST_UTF8_END_NAMESPACE + +namespace { +template<std::size_t s> +int get_cont_octet_out_count_impl(wchar_t word){ + if (word < 0x80) { + return 0; + } + if (word < 0x800) { + return 1; + } + return 2; +} + +// note the following code will generate on some platforms where +// wchar_t is defined as UCS2. The warnings are superfluous as +// the specialization is never instantitiated with such compilers. +template<> +int get_cont_octet_out_count_impl<4>(wchar_t word){ + if (word < 0x80) { + return 0; + } + if (word < 0x800) { + return 1; + } + if (word < 0x10000) { + return 2; + } + if (word < 0x200000) { + return 3; + } + if (word < 0x4000000) { + return 4; + } + return 5; +} + +} // namespace anonymous + +BOOST_UTF8_BEGIN_NAMESPACE +// How many "continuing octets" will be needed for this word +// == total octets - 1. +int utf8_codecvt_facet::get_cont_octet_out_count( + wchar_t word +) const { + return get_cont_octet_out_count_impl<sizeof(wchar_t)>(word); +} +BOOST_UTF8_END_NAMESPACE + +#endif |