[MethodImpl(MethodImplOptions.AggressiveInlining)] // called directly by GetBytesCommon
private protected sealed override unsafe int GetBytesFast(char *pChars, int charsLength, byte *pBytes, int bytesLength, out int charsConsumed)
{
int bytesWritten = (int)Latin1Utility.NarrowUtf16ToLatin1(pChars, pBytes, (uint)Math.Min(charsLength, bytesLength));
charsConsumed = bytesWritten;
return(bytesWritten);
}
// called by the fallback mechanism
private protected sealed override unsafe int GetCharsFast(byte *pBytes, int bytesLength, char *pChars, int charsLength, out int bytesConsumed)
{
int charsWritten = Math.Min(bytesLength, charsLength);
Latin1Utility.WidenLatin1ToUtf16(pBytes, pChars, (uint)charsWritten);
bytesConsumed = charsWritten;
return(charsWritten);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)] // called directly by GetByteCountCommon
private protected sealed override unsafe int GetByteCountFast(char *pChars, int charsLength, EncoderFallback?fallback, out int charsConsumed)
{
// Can we short-circuit the entire calculation? If so, the output byte count
// will exactly match the input char count. Otherwise we need to walk the
// entire input and find the index of the first non-Latin-1 char.
int byteCount = charsLength;
if (!FallbackSupportsFastGetByteCount(fallback))
{
// Unrecognized fallback mechanism - count chars manually.
byteCount = (int)Latin1Utility.GetIndexOfFirstNonLatin1Char(pChars, (uint)charsLength);
}
charsConsumed = byteCount;
return(byteCount);
}
private unsafe int GetCharsCommon(byte *pBytes, int byteCount, char *pChars, int charCount)
{
// Common helper method for all non-DecoderNLS entry points to GetChars.
// A modification of this method should be copied in to each of the supported encodings: ASCII, UTF8, UTF16, UTF32.
Debug.Assert(byteCount >= 0, "Caller shouldn't specify negative length buffer.");
Debug.Assert(pBytes != null || byteCount == 0, "Input pointer shouldn't be null if non-zero length specified.");
Debug.Assert(charCount >= 0, "Caller shouldn't specify negative length buffer.");
Debug.Assert(pChars != null || charCount == 0, "Input pointer shouldn't be null if non-zero length specified.");
// If we already know ahead of time that the destination buffer isn't large enough to hold
// the widened data, fail immediately.
if (byteCount > charCount)
{
ThrowCharsOverflow();
}
Latin1Utility.WidenLatin1ToUtf16(pBytes, pChars, (uint)byteCount);
return(byteCount);
}