internal unsafe static int GetCodePageByteSize(int codePage)
{
BaseCodePageEncoding.CodePageHeader *ptr = BaseCodePageEncoding.FindCodePage(codePage);
if (ptr == null)
{
return(0);
}
return((int)ptr->ByteCount);
}
internal static unsafe int GetCodePageByteSize(int codePage)
{
BaseCodePageEncoding.CodePageHeader *codePage1 = BaseCodePageEncoding.FindCodePage(codePage);
if ((IntPtr)codePage1 == IntPtr.Zero)
{
return(0);
}
return((int)codePage1->ByteCount);
}
private unsafe void LoadCodePageTables()
{
BaseCodePageEncoding.CodePageHeader *codePage = BaseCodePageEncoding.FindCodePage(this.dataTableCodePage);
if ((IntPtr)codePage == IntPtr.Zero)
{
throw new NotSupportedException(Environment.GetResourceString("NotSupported_NoCodepageData", (object)this.CodePage));
}
this.pCodePage = codePage;
this.LoadManagedCodePage();
}
private unsafe void LoadCodePageTables()
{
BaseCodePageEncoding.CodePageHeader *ptr = BaseCodePageEncoding.FindCodePage(this.dataTableCodePage);
if (ptr == null)
{
throw new NotSupportedException(Environment.GetResourceString("NotSupported_NoCodepageData", new object[]
{
this.CodePage
}));
}
this.pCodePage = ptr;
this.LoadManagedCodePage();
}
internal InternalDecoderBestFitFallback(BaseCodePageEncoding _encoding)
{
// Need to load our replacement characters table.
encoding = _encoding;
}
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);
}
internal InternalDecoderBestFitFallback(BaseCodePageEncoding _encoding)
{
// Need to load our replacement characters table.
encoding = _encoding;
}
public override System.Collections.Generic.IEnumerable <System.Text.EncodingInfo> GetEncodings() => BaseCodePageEncoding.GetEncodings(this);
