155 lines
4.3 KiB
C++
155 lines
4.3 KiB
C++
/* Copyright (C) 2004-2019 J.F.Dockes
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "autoconfig.h"
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#include <string>
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#include <iostream>
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#include <mutex>
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#include <errno.h>
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#include <iconv.h>
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#include "transcode.h"
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#include "log.h"
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using namespace std;
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// We gain approximately 25% exec time for word at a time conversions by
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// caching the iconv_open thing.
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//
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// We may also lose some concurrency on multiproc because of the
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// necessary locking, but we only have one processing-intensive
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// possible thread for now (the indexing one), so this is probably not
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// an issue (and could be worked around with a slightly more
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// sohisticated approach).
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#define ICONV_CACHE_OPEN
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bool transcode(const string &in, string &out, const string &icode,
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const string &ocode, int *ecnt)
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{
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LOGDEB2("Transcode: " << icode << " -> " << ocode << "\n");
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#ifdef ICONV_CACHE_OPEN
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static iconv_t ic = (iconv_t)-1;
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static string cachedicode;
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static string cachedocode;
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static std::mutex o_cachediconv_mutex;
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std::unique_lock<std::mutex> lock(o_cachediconv_mutex);
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#else
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iconv_t ic;
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#endif
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bool ret = false;
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const int OBSIZ = 8192;
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char obuf[OBSIZ], *op;
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bool icopen = false;
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int mecnt = 0;
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out.erase();
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size_t isiz = in.length();
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out.reserve(isiz);
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const char *ip = in.c_str();
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#ifdef ICONV_CACHE_OPEN
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if (cachedicode.compare(icode) || cachedocode.compare(ocode)) {
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if (ic != (iconv_t)-1) {
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iconv_close(ic);
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ic = (iconv_t)-1;
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}
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#endif
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if((ic = iconv_open(ocode.c_str(), icode.c_str())) == (iconv_t)-1) {
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out = string("iconv_open failed for ") + icode
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+ " -> " + ocode;
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#ifdef ICONV_CACHE_OPEN
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cachedicode.erase();
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cachedocode.erase();
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#endif
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goto error;
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}
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#ifdef ICONV_CACHE_OPEN
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cachedicode.assign(icode);
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cachedocode.assign(ocode);
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}
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#endif
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icopen = true;
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while (isiz > 0) {
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size_t osiz;
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op = obuf;
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osiz = OBSIZ;
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if(iconv(ic, (ICONV_CONST char **)&ip, &isiz, &op, &osiz) == (size_t)-1
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&& errno != E2BIG) {
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#if 0
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out.erase();
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out = string("iconv failed for ") + icode + " -> " + ocode +
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" : " + strerror(errno);
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#endif
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if (errno == EILSEQ) {
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LOGDEB1("transcode:iconv: bad input seq.: shift, retry\n");
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LOGDEB1(" Input consumed " << ip - in << " output produced " <<
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out.length() + OBSIZ - osiz << "\n");
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out.append(obuf, OBSIZ - osiz);
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out += "?";
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mecnt++;
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ip++;isiz--;
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continue;
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}
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// Normally only EINVAL is possible here: incomplete
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// multibyte sequence at the end. This is not fatal. Any
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// other is supposedly impossible, we return an error
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if (errno == EINVAL)
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goto out;
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else
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goto error;
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}
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out.append(obuf, OBSIZ - osiz);
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}
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#ifndef ICONV_CACHE_OPEN
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icopen = false;
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if(iconv_close(ic) == -1) {
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out.erase();
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out = string("iconv_close failed for ") + icode + " -> " + ocode;
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goto error;
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}
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#endif
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out:
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ret = true;
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error:
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if (icopen) {
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#ifndef ICONV_CACHE_OPEN
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iconv_close(ic);
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#else
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// Just reset conversion
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iconv(ic, 0, 0, 0, 0);
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#endif
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}
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if (mecnt)
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LOGDEB("transcode: [" << icode << "]->[" << ocode << "] " <<
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mecnt << " errors\n");
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if (ecnt)
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*ecnt = mecnt;
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return ret;
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}
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