Subject: [Boost-commit] svn:boost r86612 - trunk/boost/detail
From: ramey_at_[hidden]
Date: 2013-11-10 21:18:52
Author: ramey
Date: 2013-11-10 21:18:51 EST (Sun, 10 Nov 2013)
New Revision: 86612
URL: http://svn.boost.org/trac/boost/changeset/86612
Log:
changed codecvt_utf8 so that serialization uses the standard one if available. If there is no standard one available, it uses the one in boost/utility.
Deleted:
trunk/boost/detail/utf8_codecvt_facet.ipp
Deleted: trunk/boost/detail/utf8_codecvt_facet.ipp
==============================================================================
--- trunk/boost/detail/utf8_codecvt_facet.ipp 2013-11-10 21:18:51 EST (Sun, 10 Nov 2013) (r86611)
+++ /dev/null 00:00:00 1970 (deleted)
@@ -1,285 +0,0 @@
-/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
-// utf8_codecvt_facet.ipp
-
-// Copyright (c) 2001 Ronald Garcia, Indiana University (garcia_at_[hidden])
-// Andrew Lumsdaine, Indiana University (lums_at_[hidden]).
-// 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;
-}
-
-template<>
-int get_cont_octet_out_count_impl<4>(wchar_t word){
- if (word < 0x80) {
- return 0;
- }
- if (word < 0x800) {
- return 1;
- }
-
- // Note that the following code will generate warnings on some platforms
- // where wchar_t is defined as UCS2. The warnings are superfluous as the
- // specialization is never instantitiated with such compilers, but this
- // can cause problems if warnings are being treated as errors, so we guard
- // against that. Including <boost/detail/utf8_codecvt_facet.hpp> as we do
- // should be enough to get WCHAR_MAX defined.
-#if !defined(WCHAR_MAX)
-# error WCHAR_MAX not defined!
-#endif
- // cope with VC++ 7.1 or earlier having invalid WCHAR_MAX
-#if defined(_MSC_VER) && _MSC_VER <= 1310 // 7.1 or earlier
- return 2;
-#elif WCHAR_MAX > 0x10000
-
- if (word < 0x10000) {
- return 2;
- }
- if (word < 0x200000) {
- return 3;
- }
- if (word < 0x4000000) {
- return 4;
- }
- return 5;
-
-#else
- return 2;
-#endif
-}
-
-} // 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