public DBCSDecoder(DBCSCodePageEncoding encoding) : base(encoding)
{
// Base calls reset
}
private static Encoding GetEncodingRare(int codepage)
{
Encoding result = null;
switch (codepage)
{
case ISCIIAssemese:
case ISCIIBengali:
case ISCIIDevanagari:
case ISCIIGujarathi:
case ISCIIKannada:
case ISCIIMalayalam:
case ISCIIOriya:
case ISCIIPanjabi:
case ISCIITamil:
case ISCIITelugu:
result = new ISCIIEncoding(codepage);
break;
// GB2312-80 uses same code page for 20936 and mac 10008
case CodePageMacGB2312:
// case CodePageGB2312:
// result = new DBCSCodePageEncoding(codepage, EUCCN);
result = new DBCSCodePageEncoding(CodePageMacGB2312, CodePageGB2312);
break;
// Mac Korean 10003 and 20949 are the same
case CodePageMacKorean:
result = new DBCSCodePageEncoding(CodePageMacKorean, CodePageDLLKorean);
break;
// GB18030 Code Pages
case GB18030:
result = new GB18030Encoding();
break;
// ISO2022 Code Pages
case ISOKorean:
// case ISOSimplifiedCN
case ChineseHZ:
case ISO2022JP: // JIS JP, full-width Katakana mode (no half-width Katakana)
case ISO2022JPESC: // JIS JP, esc sequence to do Katakana.
case ISO2022JPSISO: // JIS JP with Shift In/ Shift Out Katakana support
result = new ISO2022Encoding(codepage);
break;
// Duplicate EUC-CN (51936) just calls a base code page 936,
// so does ISOSimplifiedCN (50227), which's gotta be broken
case DuplicateEUCCN:
case ISOSimplifiedCN:
result = new DBCSCodePageEncoding(codepage, EUCCN); // Just maps to 936
break;
case EUCJP:
result = new EUCJPEncoding();
break;
case EUCKR:
result = new DBCSCodePageEncoding(codepage, CodePageDLLKorean); // Maps to 20949
break;
case ISO_8859_8I:
result = new SBCSCodePageEncoding(codepage, ISO_8859_8_Visual); // Hebrew maps to a different code page
break;
}
return result;
}
public override Encoding GetEncoding(int codepage)
{
if (codepage < 0 || codepage > 65535)
return null;
if (codepage == 0)
{
// Retrieve the system default non-unicode code page if possible, or return null,
// giving the rest of the EncodingProviders a chance to return a default.
int systemDefaultCodePage = SystemDefaultCodePage;
return systemDefaultCodePage != 0 ?
GetEncoding(systemDefaultCodePage) :
null;
}
Encoding result = null;
_cacheLock.EnterUpgradeableReadLock();
try
{
if (_encodings.TryGetValue(codepage, out result))
return result;
int i = BaseCodePageEncoding.GetCodePageByteSize(codepage);
if (i == 1)
{
result = new SBCSCodePageEncoding(codepage);
}
else if (i == 2)
{
result = new DBCSCodePageEncoding(codepage);
}
else
{
result = GetEncodingRare(codepage);
if (result == null)
return null;
}
_cacheLock.EnterWriteLock();
try
{
Encoding cachedEncoding;
if (_encodings.TryGetValue(codepage, out cachedEncoding))
return cachedEncoding;
_encodings.Add(codepage, result);
}
finally
{
_cacheLock.ExitWriteLock();
}
}
finally
{
_cacheLock.ExitUpgradeableReadLock();
}
return result;
}
[System.Security.SecurityCritical] // auto-generated
private static Encoding GetEncodingRare(int codepage)
{
Contract.Assert(codepage != 0 && codepage != 1200 && codepage != 1201 && codepage != 65001,
"[Encoding.GetEncodingRare]This code page (" + codepage + ") isn't supported by GetEncodingRare!");
Encoding result;
switch (codepage)
{
case CodePageUTF7: // 65000
result = UTF7;
break;
case CodePageUTF32: // 12000
result = UTF32;
break;
case CodePageUTF32BE: // 12001
result = new UTF32Encoding(true, true);
break;
case ISCIIAssemese:
case ISCIIBengali:
case ISCIIDevanagari:
case ISCIIGujarathi:
case ISCIIKannada:
case ISCIIMalayalam:
case ISCIIOriya:
case ISCIIPanjabi:
case ISCIITamil:
case ISCIITelugu:
result = new ISCIIEncoding(codepage);
break;
// GB2312-80 uses same code page for 20936 and mac 10008
case CodePageMacGB2312:
// case CodePageGB2312:
// result = new DBCSCodePageEncoding(codepage, EUCCN);
result = new DBCSCodePageEncoding(CodePageMacGB2312, CodePageGB2312);
break;
// Mac Korean 10003 and 20949 are the same
case CodePageMacKorean:
result = new DBCSCodePageEncoding(CodePageMacKorean, CodePageDLLKorean);
break;
// GB18030 Code Pages
case GB18030:
result = new GB18030Encoding();
break;
// ISO2022 Code Pages
case ISOKorean:
// case ISOSimplifiedCN
case ChineseHZ:
case ISO2022JP: // JIS JP, full-width Katakana mode (no half-width Katakana)
case ISO2022JPESC: // JIS JP, esc sequence to do Katakana.
case ISO2022JPSISO: // JIS JP with Shift In/ Shift Out Katakana support
result = new ISO2022Encoding(codepage);
break;
// Duplicate EUC-CN (51936) just calls a base code page 936,
// so does ISOSimplifiedCN (50227), which's gotta be broken
case DuplicateEUCCN:
case ISOSimplifiedCN:
result = new DBCSCodePageEncoding(codepage, EUCCN); // Just maps to 936
break;
case EUCJP:
result = new EUCJPEncoding();
break;
case EUCKR:
result = new DBCSCodePageEncoding(codepage, CodePageDLLKorean); // Maps to 20949
break;
case ENC50229:
throw new NotSupportedException(Environment.GetResourceString("NotSupported_CodePage50229"));
case ISO_8859_8I:
result = new SBCSCodePageEncoding(codepage, ISO_8859_8_Visual); // Hebrew maps to a different code page
break;
default:
// Not found, already tried codepage table code pages in GetEncoding()
throw new NotSupportedException(
Environment.GetResourceString("NotSupported_NoCodepageData", codepage));
}
return result;
}
private static Encoding GetEncodingRare(int codepage)
{
Encoding result = null;
switch (codepage)
{
case ISCIIAssemese:
case ISCIIBengali:
case ISCIIDevanagari:
case ISCIIGujarathi:
case ISCIIKannada:
case ISCIIMalayalam:
case ISCIIOriya:
case ISCIIPanjabi:
case ISCIITamil:
case ISCIITelugu:
result = new ISCIIEncoding(codepage);
break;
// GB2312-80 uses same code page for 20936 and mac 10008
case CodePageMacGB2312:
// case CodePageGB2312:
// result = new DBCSCodePageEncoding(codepage, EUCCN);
result = new DBCSCodePageEncoding(CodePageMacGB2312, CodePageGB2312);
break;
// Mac Korean 10003 and 20949 are the same
case CodePageMacKorean:
result = new DBCSCodePageEncoding(CodePageMacKorean, CodePageDLLKorean);
break;
// GB18030 Code Pages
case GB18030:
result = new GB18030Encoding();
break;
// ISO2022 Code Pages
case ISOKorean:
// case ISOSimplifiedCN
case ChineseHZ:
case ISO2022JP: // JIS JP, full-width Katakana mode (no half-width Katakana)
case ISO2022JPESC: // JIS JP, esc sequence to do Katakana.
case ISO2022JPSISO: // JIS JP with Shift In/ Shift Out Katakana support
result = new ISO2022Encoding(codepage);
break;
// Duplicate EUC-CN (51936) just calls a base code page 936,
// so does ISOSimplifiedCN (50227), which has gotta be broken
case DuplicateEUCCN:
case ISOSimplifiedCN:
result = new DBCSCodePageEncoding(codepage, EUCCN); // Just maps to 936
break;
case EUCJP:
result = new EUCJPEncoding();
break;
case EUCKR:
result = new DBCSCodePageEncoding(codepage, CodePageDLLKorean); // Maps to 20949
break;
case ISO_8859_8I:
result = new SBCSCodePageEncoding(codepage, ISO_8859_8_Visual); // Hebrew maps to a different code page
break;
}
return(result);
}
public override Encoding?GetEncoding(int codepage)
{
if (codepage < 0 || codepage > 65535)
{
return(null);
}
if (codepage == 0)
{
// Retrieve the system default non-unicode code page if possible, or return null,
// giving the rest of the EncodingProviders a chance to return a default.
int systemDefaultCodePage = SystemDefaultCodePage;
return(systemDefaultCodePage != 0 ?
GetEncoding(systemDefaultCodePage) :
null);
}
Encoding?result = null;
_cacheLock.EnterUpgradeableReadLock();
try
{
if (_encodings.TryGetValue(codepage, out result))
{
return(result);
}
int i = BaseCodePageEncoding.GetCodePageByteSize(codepage);
if (i == 1)
{
result = new SBCSCodePageEncoding(codepage);
}
else if (i == 2)
{
result = new DBCSCodePageEncoding(codepage);
}
else
{
result = GetEncodingRare(codepage);
if (result == null)
{
return(null);
}
}
_cacheLock.EnterWriteLock();
try
{
if (_encodings.TryGetValue(codepage, out Encoding? cachedEncoding))
{
return(cachedEncoding);
}
_encodings.Add(codepage, result);
}
finally
{
_cacheLock.ExitWriteLock();
}
}
finally
{
_cacheLock.ExitUpgradeableReadLock();
}
return(result);
}
public DBCSDecoder(DBCSCodePageEncoding encoding) : base(encoding)
{
}
public DBCSDecoder(DBCSCodePageEncoding encoding) : base(encoding)
{
}
