Decode() [2/3]

void System.Xml.Base64Decoder.Decode ( ReadOnlySpan< char > chars, Span< byte > bytes, out int charsDecoded, out int bytesDecoded )

inlineprivate

Definition at line 105 of file Base64Decoder.cs.

    {
        int num = 0;
        int num2 = 0;
        int num3 = _bits;
        int num4 = _bitsFilled;
        while (true)
        {
            if ((uint)num2 < (uint)chars.Length && (uint)num < (uint)bytes.Length)
            {
                char c = chars[num2];
                if (c != '=')
                {
                    num2++;
                    if (XmlCharType.IsWhiteSpace(c))
                    {
                        continue;
                    }
                    int num5;
                    if (c > 'z' || (num5 = s_mapBase64[(uint)c]) == 255)
                    {
                        throw new XmlException(System.SR.Xml_InvalidBase64Value, chars.ToString());
                    }
                    num3 = (num3 << 6) | num5;
                    num4 += 6;
                    if (num4 >= 8)
                    {
                        bytes[num++] = (byte)((uint)(num3 >> num4 - 8) & 0xFFu);
                        num4 -= 8;
                        if (num == bytes.Length)
                        {
                            break;
                        }
                    }
                    continue;
                }
            }
            if ((uint)num2 >= (uint)chars.Length || chars[num2] != '=')
            {
                break;
            }
            num4 = 0;
            do
            {
                num2++;
            }
            while ((uint)num2 < (uint)chars.Length && chars[num2] == '=');
            while ((uint)num2 < (uint)chars.Length)
            {
                if (!XmlCharType.IsWhiteSpace(chars[num2++]))
                {
                    throw new XmlException(System.SR.Xml_InvalidBase64Value, chars.ToString());
                }
            }
            break;
        }
        _bits = num3;
        _bitsFilled = num4;
        bytesDecoded = num;
        charsDecoded = num2;
    }

References System.Xml.Base64Decoder._bits, System.Xml.Base64Decoder._bitsFilled, System.bytes, System.chars, System.Xml.Dictionary, System.Xml.XmlCharType.IsWhiteSpace(), System.Xml.Base64Decoder.s_mapBase64, System.SR.Xml_InvalidBase64Value, and System.Xml.XmlException.