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clean: port DSL encoding guessing away from QTextCodec (#1799)

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shenleban tongying 2024-10-06 15:59:07 -04:00 committed by GitHub
parent 96ada0737c
commit 1c2f93e393
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GPG key ID: B5690EEEBB952194
2 changed files with 30 additions and 32 deletions
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1
.clang-tidy
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@ -27,6 +27,7 @@ Checks: >
-google-readability-casting,
-hicpp-deprecated-headers,
-misc-const-correctness,
-misc-include-cleaner,
-misc-non-private-member-variables-in-classes,
-modernize-avoid-c-arrays,
-modernize-deprecated-headers,

61
src/dict/dsl_details.cc
View file

@ -807,7 +807,7 @@ bool ArticleDom::atSignFirstInLine()
/////////////// DslScanner
DslScanner::DslScanner( string const & fileName ):
encoding( Utf8::Windows1252 ),
encoding( Utf8::Utf8 ),
readBufferPtr( readBuffer ),
readBufferLeft( 0 ),
linesRead( 0 )
@ -819,11 +819,12 @@ DslScanner::DslScanner( string const & fileName ):
if ( !f )
throw exCantOpen( fileName );
// Now try guessing the encoding by reading the first two bytes
// Now try guessing the encoding
unsigned char firstBytes[ 50 ];
constexpr size_t firstBytesSize = 50;
unsigned char firstBytes[ firstBytesSize ];
if ( gzread( f, firstBytes, sizeof( firstBytes ) ) != sizeof( firstBytes ) ) {
if ( gzread( f, firstBytes, firstBytesSize ) != firstBytesSize ) {
// Apparently the file's too short
gzclose( f );
throw exMalformedDslFile( fileName );
@ -831,37 +832,33 @@ DslScanner::DslScanner( string const & fileName ):
bool needExactEncoding = false;
QByteArray ba = QByteArray::fromRawData( (const char *)firstBytes, 50 );
codec = QTextCodec::codecForUtfText( ba, nullptr );
if ( !codec ) {
// the encoding has no bom.
// check the first char # (0x23).
auto hashTag = 0x0023;
auto uci = qFromUnaligned< uint32_t >( firstBytes );
if ( uci == qToBigEndian( hashTag ) ) {
codec = QTextCodec::codecForMib( 1018 ); // utf-32 be
}
else if ( uci == qToLittleEndian( hashTag ) ) {
codec = QTextCodec::codecForMib( 1019 ); // utf-32 le
}
else {
auto uc = qFromUnaligned< uint16_t >( firstBytes );
if ( uc == qToBigEndian( uint16_t( hashTag ) ) ) {
codec = QTextCodec::codecForMib( 1013 ); // utf16 be
}
else if ( uc == qToLittleEndian( uint16_t( hashTag ) ) ) {
codec = QTextCodec::codecForMib( 1014 ); // utf16 le
}
else {
//default encoding
codec = QTextCodec::codecForName( "UTF-8" );
}
// Note that .dsl format always starts with "#NAME"
if ( auto guessedEncoding = QStringConverter::encodingForData( { firstBytes, firstBytesSize }, '#' );
guessedEncoding.has_value() ) {
switch ( guessedEncoding.value() ) {
case QStringConverter::Utf8:
encoding = Utf8::Utf8;
break;
case QStringConverter::Utf16LE:
encoding = Utf8::Utf16LE;
break;
case QStringConverter::Utf16BE:
encoding = Utf8::Utf16BE;
break;
case QStringConverter::Utf32LE:
encoding = Utf8::Utf16LE;
break;
case QStringConverter::Utf32BE:
encoding = Utf8::Utf32BE;
break;
default:
break;
}
}
encoding = Utf8::getEncodingForName( codec->name() );
qDebug() << codec->name();
codec = QTextCodec::codecForName( getEncodingNameFor( encoding ) );
qDebug() << "DSL encoding ->" << codec->name();
if ( gzrewind( f ) ) {
gzclose( f );