DecodeBytes()

unsafe int System.Net.Base64Stream.DecodeBytes ( byte[] buffer, int offset, int count )

inline

Implements System.Net.Mime.IEncodableStream.

Definition at line 256 of file Base64Stream.cs.

    {
        fixed (byte* ptr = buffer)
        {
            byte* ptr2 = ptr + offset;
            byte* ptr3 = ptr2;
            byte* ptr4 = ptr2;
            byte* ptr5 = ptr2 + count;
            while (ptr3 < ptr5)
            {
                if (*ptr3 == 13 || *ptr3 == 10 || *ptr3 == 61 || *ptr3 == 32 || *ptr3 == 9)
                {
                    ptr3++;
                    continue;
                }
                byte b = Base64DecodeMap[*ptr3];
                if (b == byte.MaxValue)
                {
                    throw new FormatException(System.SR.MailBase64InvalidCharacter);
                }
                switch (ReadState.Pos)
                {
                case 0:
                    ReadState.Val = (byte)(b << 2);
                    ReadState.Pos++;
                    break;
                case 1:
                    *(ptr4++) = (byte)(ReadState.Val + (b >> 4));
                    ReadState.Val = (byte)(b << 4);
                    ReadState.Pos++;
                    break;
                case 2:
                    *(ptr4++) = (byte)(ReadState.Val + (b >> 2));
                    ReadState.Val = (byte)(b << 6);
                    ReadState.Pos++;
                    break;
                case 3:
                    *(ptr4++) = (byte)(ReadState.Val + b);
                    ReadState.Pos = 0;
                    break;
                }
                ptr3++;
            }
            return (int)(ptr4 - ptr2);
        }
    }

References System.Net.Base64Stream.Base64DecodeMap, System.buffer, System.count, System.SR.MailBase64InvalidCharacter, and System.offset.

Referenced by System.Net.Base64Stream.ReadAsyncResult.CompleteRead(), and System.Net.Base64Stream.Read().