mirror of
https://git.lyx.org/repos/lyx.git
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378 lines
9.7 KiB
C++
378 lines
9.7 KiB
C++
/**
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* \file unicode.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Lars Gullik Bjønnes
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*
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* Full author contact details are available in file CREDITS.
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*
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* A collection of unicode conversion functions, using iconv.
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*/
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#include <config.h>
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#include "support/unicode.h"
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#include "support/debug.h"
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#include <QThreadStorage>
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#include <iconv.h>
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#include <cerrno>
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#include <cstdint>
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#include <map>
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#include <ostream>
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//Needed in MSVC
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#include <string>
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using namespace std;
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namespace {
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#ifdef WORDS_BIGENDIAN
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char const * utf16_codeset = "UTF16-BE";
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#else
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char const * utf16_codeset = "UTF16-LE";
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#endif
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}
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namespace lyx {
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#ifdef WORDS_BIGENDIAN
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char const * ucs4_codeset = "UCS-4BE";
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#else
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char const * ucs4_codeset = "UCS-4LE";
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#endif
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struct IconvProcessor::Handler {
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// assumes cd is valid
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explicit Handler(iconv_t const cd) : cd(cd) {}
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~Handler() {
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if (iconv_close(cd) == -1)
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LYXERR0("Error returned from iconv_close(" << errno << ')');
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}
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iconv_t const cd;
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};
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IconvProcessor::IconvProcessor(string tocode, string fromcode)
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: tocode_(move(tocode)), fromcode_(move(fromcode))
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{}
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bool IconvProcessor::init()
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{
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if (h_)
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return true;
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iconv_t cd = iconv_open(tocode_.c_str(), fromcode_.c_str());
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if (cd != (iconv_t)(-1)) {
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h_ = make_unique<Handler>(cd);
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return true;
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}
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lyxerr << "Error returned from iconv_open" << endl;
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switch (errno) {
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case EINVAL:
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lyxerr << "EINVAL The conversion from " << fromcode_ << " to "
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<< tocode_ << " is not supported by the implementation."
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<< endl;
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break;
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default:
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lyxerr << "\tSome other error: " << errno << endl;
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break;
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}
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return false;
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}
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int IconvProcessor::convert(char const * buf, size_t buflen,
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char * outbuf, size_t maxoutsize)
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{
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if (buflen == 0)
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return 0;
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if (!h_ && !init())
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return -1;
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char ICONV_CONST * inbuf = const_cast<char ICONV_CONST *>(buf);
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size_t inbytesleft = buflen;
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size_t outbytesleft = maxoutsize;
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int res = iconv(h_->cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
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// flush out remaining data. This is needed because iconv sometimes
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// holds back chars in the stream, waiting for a combination character
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// (see e.g. http://sources.redhat.com/bugzilla/show_bug.cgi?id=1124)
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iconv(h_->cd, nullptr, nullptr, &outbuf, &outbytesleft);
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//lyxerr << dec;
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//lyxerr << "Inbytesleft: " << inbytesleft << endl;
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//lyxerr << "Outbytesleft: " << outbytesleft << endl;
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if (res != -1)
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// Everything went well.
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return maxoutsize - outbytesleft;
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// There are some errors in the conversion
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lyxerr << "Error returned from iconv" << endl;
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switch (errno) {
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case E2BIG:
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lyxerr << "E2BIG There is not sufficient room at *outbuf." << endl;
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break;
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case EILSEQ:
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case EINVAL:
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lyxerr << (errno == EINVAL
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? "EINVAL An incomplete "
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: "EILSEQ An invalid ")
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<< "multibyte sequence has been encountered in the input.\n"
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<< "When converting from " << fromcode_
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<< " to " << tocode_ << ".\n";
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lyxerr << "Input:" << hex;
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for (size_t i = 0; i < buflen; ++i) {
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// char may be signed, avoid output of
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// something like 0xffffffc2
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uint32_t const b =
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*reinterpret_cast<unsigned char const *>(buf + i);
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lyxerr << " 0x" << (unsigned int)b;
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}
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lyxerr << dec << endl;
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break;
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default:
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lyxerr << "\tSome other error: " << errno << endl;
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break;
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}
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// We got an error so we close down the conversion engine
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h_.reset();
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return -1;
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}
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namespace {
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template<typename RetType, typename InType>
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vector<RetType>
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iconv_convert(IconvProcessor & processor, InType const * buf, size_t buflen)
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{
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if (buflen == 0)
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return vector<RetType>();
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char const * inbuf = reinterpret_cast<char const *>(buf);
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size_t inbytesleft = buflen * sizeof(InType);
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static QThreadStorage<std::vector<char> *> static_outbuf;
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if (!static_outbuf.hasLocalData())
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static_outbuf.setLocalData(new std::vector<char>(32768));
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std::vector<char> & outbuf = *static_outbuf.localData();
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// The number of UCS4 code points in buf is at most inbytesleft.
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// The output encoding will use at most
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// max_encoded_bytes(pimpl_->tocode_) per UCS4 code point.
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size_t maxoutbufsize = max_encoded_bytes(processor.to()) * inbytesleft;
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if (outbuf.size() < maxoutbufsize)
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outbuf.resize(maxoutbufsize);
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int bytes = processor.convert(inbuf, inbytesleft, &outbuf[0], outbuf.size());
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if (bytes <= 0)
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// Conversion failed
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// FIXME Maybe throw an exception and handle that in the caller?
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return vector<RetType>();
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RetType const * tmp = reinterpret_cast<RetType const *>(&outbuf[0]);
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return vector<RetType>(tmp, tmp + bytes / sizeof(RetType));
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}
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} // namespace
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IconvProcessor & utf8ToUcs4()
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{
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static QThreadStorage<IconvProcessor *> processor;
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if (!processor.hasLocalData())
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processor.setLocalData(new IconvProcessor(ucs4_codeset, "UTF-8"));
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return *processor.localData();
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}
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vector<char_type> utf8_to_ucs4(vector<char> const & utf8str)
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{
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if (utf8str.empty())
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return vector<char_type>();
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return utf8_to_ucs4(&utf8str[0], utf8str.size());
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}
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vector<char_type>
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utf8_to_ucs4(char const * utf8str, size_t ls)
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{
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return iconv_convert<char_type>(utf8ToUcs4(), utf8str, ls);
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}
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vector<char_type>
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utf16_to_ucs4(unsigned short const * s, size_t ls)
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{
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static QThreadStorage<IconvProcessor *> processor;
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if (!processor.hasLocalData())
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processor.setLocalData(new IconvProcessor(ucs4_codeset, utf16_codeset));
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return iconv_convert<char_type>(*processor.localData(), s, ls);
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}
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vector<unsigned short>
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ucs4_to_utf16(char_type const * s, size_t ls)
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{
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static QThreadStorage<IconvProcessor *> processor;
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if (!processor.hasLocalData())
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processor.setLocalData(new IconvProcessor(utf16_codeset, ucs4_codeset));
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return iconv_convert<unsigned short>(*processor.localData(), s, ls);
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}
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IconvProcessor & ucs4ToUtf8()
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{
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static QThreadStorage<IconvProcessor *> processor;
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if (!processor.hasLocalData())
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processor.setLocalData(new IconvProcessor("UTF-8", ucs4_codeset));
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return *processor.localData();
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}
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namespace {
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IconvProcessor & getProc(map<string, IconvProcessor> & processors,
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string const & encoding, bool to)
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{
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string const & fromcode = to ? ucs4_codeset : encoding;
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string const & tocode = to ? encoding : ucs4_codeset;
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map<string, IconvProcessor>::iterator const it = processors.find(encoding);
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if (it == processors.end()) {
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IconvProcessor p(fromcode, tocode);
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return processors.insert(make_pair(encoding, move(p))).first->second;
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}
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return it->second;
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}
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} // namespace
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vector<char>
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ucs4_to_utf8(char_type c)
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{
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return iconv_convert<char>(ucs4ToUtf8(), &c, 1);
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}
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vector<char>
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ucs4_to_utf8(vector<char_type> const & ucs4str)
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{
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if (ucs4str.empty())
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return vector<char>();
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return ucs4_to_utf8(&ucs4str[0], ucs4str.size());
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}
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vector<char>
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ucs4_to_utf8(char_type const * ucs4str, size_t ls)
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{
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return iconv_convert<char>(ucs4ToUtf8(), ucs4str, ls);
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}
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vector<char_type>
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eightbit_to_ucs4(char const * s, size_t ls, string const & encoding)
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{
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static QThreadStorage<map<string, IconvProcessor> *> static_processors;
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if (!static_processors.hasLocalData())
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static_processors.setLocalData(new map<string, IconvProcessor>);
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map<string, IconvProcessor> & processors = *static_processors.localData();
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IconvProcessor & processor = getProc(processors, encoding, true);
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return iconv_convert<char_type>(processor, s, ls);
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}
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namespace {
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map<string, IconvProcessor> & ucs4To8bitProcessors()
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{
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static QThreadStorage<map<string, IconvProcessor> *> processors;
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if (!processors.hasLocalData())
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processors.setLocalData(new map<string, IconvProcessor>);
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return *processors.localData();
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}
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} // namespace
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vector<char>
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ucs4_to_eightbit(char_type const * ucs4str, size_t ls, string const & encoding)
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{
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map<string, IconvProcessor> & processors(ucs4To8bitProcessors());
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IconvProcessor & processor = getProc(processors, encoding, false);
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return iconv_convert<char>(processor, ucs4str, ls);
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}
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char ucs4_to_eightbit(char_type ucs4, string const & encoding)
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{
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map<string, IconvProcessor> & processors(ucs4To8bitProcessors());
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IconvProcessor & processor = getProc(processors, encoding, false);
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char out;
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int const bytes = processor.convert((char *)(&ucs4), 4, &out, 1);
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if (bytes > 0)
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return out;
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return 0;
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}
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void ucs4_to_multibytes(char_type ucs4, vector<char> & out,
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string const & encoding)
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{
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static QThreadStorage<map<string, IconvProcessor> *> static_processors;
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if (!static_processors.hasLocalData())
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static_processors.setLocalData(new map<string, IconvProcessor>);
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map<string, IconvProcessor> & processors = *static_processors.localData();
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IconvProcessor & processor = getProc(processors, encoding, false);
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out.resize(4);
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int bytes = processor.convert((char *)(&ucs4), 4, &out[0], 4);
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if (bytes > 0)
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out.resize(bytes);
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else
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out.clear();
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}
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int max_encoded_bytes(std::string const & encoding)
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{
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// FIXME: this information should be transferred to lib/encodings
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// UTF8 uses at most 4 bytes to represent one UCS4 code point
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// (see RFC 3629). RFC 2279 specifies 6 bytes, but that
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// information is outdated, and RFC 2279 has been superseded by
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// RFC 3629.
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// The CJK encodings use (different) multibyte representation as well.
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// All other encodings encode one UCS4 code point in one byte
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// (and can therefore only encode a subset of UCS4)
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// Furthermore, all encodings that use shifting (like SJIS) do not work with
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// iconv_codecvt_facet.
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if (encoding == "UTF-8" ||
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encoding == "GB" ||
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encoding == "EUC-TW")
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return 4;
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else if (encoding == "EUC-JP")
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return 3;
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else if (encoding == "ISO-2022-JP")
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return 8;
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else if (encoding == "BIG5" ||
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encoding == "EUC-KR" ||
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encoding == "EUC-CN" ||
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encoding == "SJIS" ||
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encoding == "GBK")
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return 2;
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else
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return 1;
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}
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} // namespace lyx
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