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/* utf8convert.cc: convert a string to UTF-8 encoding.
*
* Copyright (C) 2006,2007,2008 Olly Betts
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "utf8convert.h"
#include <algorithm>
#include <string>
#include "safeerrno.h"
#ifdef USE_ICONV
# include <iconv.h>
#else
# include <xapian.h>
#endif
#include "strcasecmp.h"
#include "stringutils.h"
using namespace std;
void
convert_to_utf8(string & text, const string & charset)
{
// Shortcut if it's already in utf8!
if (charset.size() == 5 && strcasecmp(charset.c_str(), "utf-8") == 0)
return;
if (charset.size() == 4 && strcasecmp(charset.c_str(), "utf8") == 0)
return;
// Nobody has told us what charset it's in, so do as little work as
// possible!
if (charset.empty())
return;
char buf[1024];
#ifdef USE_ICONV
iconv_t conv = iconv_open("UTF-8", charset.c_str());
if (conv == (iconv_t)-1) return;
string tmp;
ICONV_INPUT_TYPE in = const_cast<char *>(text.c_str());
size_t in_len = text.size();
while (in_len) {
char * out = buf;
size_t out_len = sizeof(buf);
if (iconv(conv, &in, &in_len, &out, &out_len) == size_t(-1) &&
errno != E2BIG) {
// FIXME: how to handle this?
break;
}
tmp.append(buf, out - buf);
}
(void)iconv_close(conv);
#else
/* If we don't have iconv, handle iso-8859-1, utf-16/ucs-2,
* utf-16be/ucs-2be, and utf-16le/ucs-2le. */
string tmp;
const char * p = charset.c_str();
bool utf16 = false;
if (strncasecmp(p, "utf", 3) == 0) {
p += 3;
if (*p == '-' || *p == '_') ++p;
if (*p != '1' || p[1] != '6') return;
p += 2;
utf16 = true;
} else if (strncasecmp(p, "ucs", 3) == 0) {
p += 3;
if (*p == '-' || *p == '_') ++p;
if (*p != '2') return;
++p;
utf16 = true;
}
if (utf16) {
if (text.size() < 2) return;
bool big_endian = true;
string::const_iterator i = text.begin();
if (*p == '\0') {
if (startswith(text, "\xfe\xff")) {
i += 2;
} else if (startswith(text, "\xff\xfe")) {
big_endian = false;
i += 2;
}
// UTF-16 with no BOM is meant to be assumed to be BE. Strictly
// speaking, we're not meant to assume anything for UCS-2 with
// no BOM, but we've got to do something, so we might as well
// assume it's UTF-16 mislabelled, which is easy and sane.
} else if (strcasecmp(p, "LE") == 0) {
big_endian = false;
} else if (!(strcasecmp(p, "BE") == 0)) {
return;
}
tmp.reserve(text.size() / 2);
size_t start = 0;
if (text.size() & 1) {
// If there's a half-character at the end, nuke it now to make the
// conversion loop below simpler.
text.resize(text.size() - 1);
}
while (i != text.end()) {
unsigned ch = static_cast<unsigned char>(*i++);
unsigned ch2 = static_cast<unsigned char>(*i++);
if (big_endian) {
ch = (ch << 8) | ch2;
} else {
ch = (ch2 << 8) | ch;
}
if (ch >> 10 == 0xd800 >> 10) {
// Surrogate pair.
if (i == text.end()) break;
unsigned hi = (ch & 0x3ff);
ch = static_cast<unsigned char>(*i++);
ch2 = static_cast<unsigned char>(*i++);
if (big_endian) {
ch = (ch << 8) | ch2;
} else {
ch = (ch2 << 8) | ch;
}
if (ch >> 10 == 0xdc00 >> 10) {
ch &= 0x3ff;
ch |= (hi << 10);
ch += 0x10000;
}
}
start += Xapian::Unicode::to_utf8(ch, buf + start);
if (start >= sizeof(buf) - 4) {
tmp.append(buf, start);
start = 0;
}
}
if (start) tmp.append(buf, start);
} else {
if (strncasecmp(p, "iso", 3) == 0) {
p += 3;
if (*p == '-' || *p == '_') ++p;
}
if (strncmp(p, "8859", 4) != 0) return;
p += 4;
if (*p == '-' || *p == '_') ++p;
if (strcmp(p, "1") != 0) return;
// FIXME: pull this out as a standard "normalise utf-8" function?
tmp.reserve(text.size());
size_t start = 0;
for (string::const_iterator i = text.begin(); i != text.end(); ++i) {
unsigned ch = static_cast<unsigned char>(*i);
start += Xapian::Unicode::to_utf8(ch, buf + start);
if (start >= sizeof(buf) - 4) {
tmp.append(buf, start);
start = 0;
}
}
if (start) tmp.append(buf, start);
}
#endif
swap(text, tmp);
}
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