GetByteCount() [2/7]

unsafe override int System.Text.DBCSCodePageEncoding.GetByteCount ( char * chars, int count, System::Text::EncoderNLS encoder )

inlinevirtualinherited

Reimplemented from System.Text.Encoding.

Reimplemented in System.Text.ISO2022Encoding, and System.Text.GB18030Encoding.

Definition at line 526 of file DBCSCodePageEncoding.cs.

    {
        CheckMemorySection();
        char c = '\0';
        if (encoder != null)
        {
            c = encoder.charLeftOver;
            if (encoder.InternalHasFallbackBuffer && encoder.FallbackBuffer.Remaining > 0)
            {
                throw new ArgumentException(System.SR.Format(System.SR.Argument_EncoderFallbackNotEmpty, EncodingName, encoder.Fallback.GetType()));
            }
        }
        int num = 0;
        char* ptr = chars + count;
        EncoderFallbackBuffer encoderFallbackBuffer = null;
        EncoderFallbackBufferHelper encoderFallbackBufferHelper = new EncoderFallbackBufferHelper(encoderFallbackBuffer);
        if (c > '\0')
        {
            encoderFallbackBuffer = encoder.FallbackBuffer;
            encoderFallbackBufferHelper = new EncoderFallbackBufferHelper(encoderFallbackBuffer);
            encoderFallbackBufferHelper.InternalInitialize(chars, ptr, encoder, _setEncoder: false);
            encoderFallbackBufferHelper.InternalFallback(c, ref chars);
        }
        char c2;
        while ((c2 = ((encoderFallbackBuffer != null) ? encoderFallbackBufferHelper.InternalGetNextChar() : '\0')) != 0 || chars < ptr)
        {
            if (c2 == '\0')
            {
                c2 = *chars;
                chars++;
            }
            ushort num2 = mapUnicodeToBytes[(int)c2];
            if (num2 == 0 && c2 != 0)
            {
                if (encoderFallbackBuffer == null)
                {
                    encoderFallbackBuffer = ((encoder != null) ? encoder.FallbackBuffer : base.EncoderFallback.CreateFallbackBuffer());
                    encoderFallbackBufferHelper = new EncoderFallbackBufferHelper(encoderFallbackBuffer);
                    encoderFallbackBufferHelper.InternalInitialize(ptr - count, ptr, encoder, _setEncoder: false);
                }
                encoderFallbackBufferHelper.InternalFallback(c2, ref chars);
            }
            else
            {
                num++;
                if (num2 >= 256)
                {
                    num++;
                }
            }
        }
        return num;
    }

References System.SR.Argument_EncoderFallbackNotEmpty, System.chars, System.Text.BaseCodePageEncoding.CheckMemorySection(), System.count, System.Text.EncodingNLS.EncodingName, System.SR.Format(), System.Text.EncoderFallbackBufferHelper.InternalFallback(), System.Text.EncoderFallbackBufferHelper.InternalGetNextChar(), System.Text.EncoderFallbackBufferHelper.InternalInitialize(), and System.Text.DBCSCodePageEncoding.mapUnicodeToBytes.