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Use MIB numbers for QTextCodec fetching

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Discard the "broken name cache" workaround and use QTextCodec search based
on MIB numbers.
This commit is contained in:
Martin Tůma 2023-12-22 09:32:47 +01:00
parent 3d27b4ea00
commit d4b731aeaf
2 changed files with 55 additions and 38 deletions
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91
src/common/textcodec.cpp
View File

@ -1,48 +1,67 @@
#include <QTextCodec>
#include "textcodec.h"
/* When Qt is compiled with ICU support, QTextCodec::codecForName() is very
slow due to broken codec name caching (the function does dozens of
comparisons and only then asks the cache...), so we use our own map. */
static QMap<int, QTextCodec *> initCodecs()
static QTextCodec *codec(int mib)
{
QMap<int, QTextCodec *> map;
QTextCodec *c = QTextCodec::codecForMib(mib);
if (!c)
qWarning("MIB-%d: No such QTextCodec, using UTF-8", mib);
map.insert(65001, 0);
map.insert(874, QTextCodec::codecForName("Windows-874"));
map.insert(932, QTextCodec::codecForName("Shift-JIS"));
map.insert(936, QTextCodec::codecForName("GB18030"));
map.insert(949, QTextCodec::codecForName("EUC-KR"));
map.insert(950, QTextCodec::codecForName("Big5"));
map.insert(1250, QTextCodec::codecForName("Windows-1250"));
map.insert(1251, QTextCodec::codecForName("Windows-1251"));
map.insert(1252, QTextCodec::codecForName("Windows-1252"));
map.insert(1253, QTextCodec::codecForName("Windows-1253"));
map.insert(1254, QTextCodec::codecForName("Windows-1254"));
map.insert(1255, QTextCodec::codecForName("Windows-1255"));
map.insert(1256, QTextCodec::codecForName("Windows-1256"));
map.insert(1257, QTextCodec::codecForName("Windows-1257"));
map.insert(1258, QTextCodec::codecForName("Windows-1258"));
return map;
}
const QMap<int, QTextCodec *> &TextCodec::codecs()
{
static QMap<int, QTextCodec *> map = initCodecs();
return map;
return c;
}
TextCodec::TextCodec(int codepage)
{
const QMap<int, QTextCodec *> &map = codecs();
QMap<int, QTextCodec *>::const_iterator it(map.find(codepage));
if (it == map.cend()) {
qWarning("%d: Unsupported codepage, using UTF-8", codepage);
_codec = 0;
} else
_codec = *it;
switch (codepage) {
case 874:
_codec = codec(2109);
break;
case 932:
_codec = codec(17);
break;
case 936:
_codec = codec(114);
break;
case 949:
_codec = codec(38);
break;
case 950:
_codec = codec(2026);
break;
case 1250:
_codec = codec(2250);
break;
case 1251:
_codec = codec(2251);
break;
case 1252:
_codec = codec(2252);
break;
case 1253:
_codec = codec(2253);
break;
case 1254:
_codec = codec(2254);
break;
case 1255:
_codec = codec(2255);
break;
case 1256:
_codec = codec(2256);
break;
case 1257:
_codec = codec(2257);
break;
case 1258:
_codec = codec(2258);
break;
case 65001:
_codec = 0;
break;
default:
qWarning("%d: Unknown codepage, using UTF-8", codepage);
_codec = 0;
}
}
QString TextCodec::toString(const QByteArray &ba) const

2
src/common/textcodec.h
View File

@ -16,8 +16,6 @@ public:
private:
QTextCodec *_codec;
static const QMap<int, QTextCodec *> &codecs();
};
#endif // TEXTCODEC_H