GetChars() [2/6]

unsafe override int System.Text.SBCSCodePageEncoding.GetChars ( byte * bytes, int byteCount, char * chars, int charCount, System::Text::DecoderNLS decoder )

inlinevirtual

Reimplemented from System.Text.EncodingNLS.

Definition at line 473 of file SBCSCodePageEncoding.cs.

    {
        CheckMemorySection();
        bool flag = false;
        byte* ptr = bytes + byteCount;
        byte* ptr2 = bytes;
        char* ptr3 = chars;
        DecoderReplacementFallback decoderReplacementFallback = null;
        if (decoder == null)
        {
            decoderReplacementFallback = base.DecoderFallback as DecoderReplacementFallback;
            flag = base.DecoderFallback is InternalDecoderBestFitFallback;
        }
        else
        {
            decoderReplacementFallback = decoder.Fallback as DecoderReplacementFallback;
            flag = decoder.Fallback is InternalDecoderBestFitFallback;
        }
        if (flag || (decoderReplacementFallback != null && decoderReplacementFallback.MaxCharCount == 1))
        {
            char c = decoderReplacementFallback?.DefaultString[0] ?? '?';
            if (charCount < byteCount)
            {
                ThrowCharsOverflow(decoder, charCount < 1);
                ptr = bytes + charCount;
            }
            while (bytes < ptr)
            {
                char c2;
                if (flag)
                {
                    if (arrayBytesBestFit == null)
                    {
                        ReadBestFitTable();
                    }
                    c2 = arrayBytesBestFit[*bytes];
                }
                else
                {
                    c2 = _mapBytesToUnicode[(int)(*bytes)];
                }
                bytes++;
                if (c2 == '\ufffd')
                {
                    *chars = c;
                }
                else
                {
                    *chars = c2;
                }
                chars++;
            }
            if (decoder != null)
            {
                decoder.m_bytesUsed = (int)(bytes - ptr2);
            }
            return (int)(chars - ptr3);
        }
        DecoderFallbackBuffer decoderFallbackBuffer = null;
        byte[] array = new byte[1];
        char* ptr4 = chars + charCount;
        DecoderFallbackBufferHelper decoderFallbackBufferHelper = new DecoderFallbackBufferHelper(null);
        while (bytes < ptr)
        {
            char c3 = _mapBytesToUnicode[(int)(*bytes)];
            bytes++;
            if (c3 == '\ufffd')
            {
                if (decoderFallbackBuffer == null)
                {
                    decoderFallbackBuffer = ((decoder != null) ? decoder.FallbackBuffer : base.DecoderFallback.CreateFallbackBuffer());
                    decoderFallbackBufferHelper = new DecoderFallbackBufferHelper(decoderFallbackBuffer);
                    decoderFallbackBufferHelper.InternalInitialize(ptr - byteCount, ptr4);
                }
                array[0] = *(bytes - 1);
                if (!decoderFallbackBufferHelper.InternalFallback(array, bytes, ref chars))
                {
                    bytes--;
                    decoderFallbackBufferHelper.InternalReset();
                    ThrowCharsOverflow(decoder, bytes == ptr2);
                    break;
                }
            }
            else
            {
                if (chars >= ptr4)
                {
                    bytes--;
                    ThrowCharsOverflow(decoder, bytes == ptr2);
                    break;
                }
                *chars = c3;
                chars++;
            }
        }
        if (decoder != null)
        {
            decoder.m_bytesUsed = (int)(bytes - ptr2);
        }
        return (int)(chars - ptr3);
    }

References System.Text.SBCSCodePageEncoding._mapBytesToUnicode, System.array, System.Text.BaseCodePageEncoding.arrayBytesBestFit, System.byteCount, System.bytes, System.charCount, System.chars, System.Text.BaseCodePageEncoding.CheckMemorySection(), System.Text.DecoderReplacementFallback.DefaultString, System.Text.DecoderFallbackBufferHelper.InternalFallback(), System.Text.DecoderFallbackBufferHelper.InternalInitialize(), System.Text.DecoderFallbackBufferHelper.InternalReset(), System.Text.DecoderReplacementFallback.MaxCharCount, System.Text.SBCSCodePageEncoding.ReadBestFitTable(), and System.Text.EncodingNLS.ThrowCharsOverflow().