/// <summary>
/// Resets the decoder.
/// </summary>
/// <remarks>
/// Resets the state of the decoder.
/// </remarks>
public void Reset()
{
state = QpDecoderState.PassThrough;
saved = 0;
}
/// <summary>
/// Decodes the specified input into the output buffer.
/// </summary>
/// <remarks>
/// <para>Decodes the specified input into the output buffer.</para>
/// <para>The output buffer should be large enough to hold all of the
/// decoded input. For estimating the size needed for the output buffer,
/// see <see cref="EstimateOutputLength"/>.</para>
/// </remarks>
/// <returns>The number of bytes written to the output buffer.</returns>
/// <param name="input">A pointer to the beginning of the input buffer.</param>
/// <param name="length">The length of the input buffer.</param>
/// <param name="output">A pointer to the beginning of the output buffer.</param>
public unsafe int Decode(byte *input, int length, byte *output)
{
byte *inend = input + length;
byte *outptr = output;
byte *inptr = input;
byte c;
while (inptr < inend)
{
switch (state)
{
case QpDecoderState.PassThrough:
while (inptr < inend)
{
c = *inptr++;
if (c == '=')
{
state = QpDecoderState.EqualSign;
break;
}
else if (rfc2047 && c == '_')
{
*outptr++ = (byte)' ';
}
else
{
*outptr++ = c;
}
}
break;
case QpDecoderState.EqualSign:
c = *inptr++;
if (c == '\n')
{
// this is a soft break ("=\n")
state = QpDecoderState.PassThrough;
}
else
{
state = QpDecoderState.DecodeByte;
saved = c;
}
break;
case QpDecoderState.DecodeByte:
c = *inptr++;
if (c.IsXDigit() && saved.IsXDigit())
{
saved = saved.ToXDigit();
c = c.ToXDigit();
*outptr++ = (byte)((saved << 4) | c);
}
else if (saved == '\r' && c == '\n')
{
// end-of-line
}
else
{
// invalid encoded sequence - pass it through undecoded
*outptr++ = (byte)'=';
*outptr++ = saved;
*outptr++ = c;
}
state = QpDecoderState.PassThrough;
break;
}
}
return((int)(outptr - output));
}
/// <summary>
/// Decodes the specified input into the output buffer.
/// </summary>
/// <returns>The number of bytes written to the output buffer.</returns>
/// <param name='input'>A pointer to the beginning of the input buffer.</param>
/// <param name='length'>The length of the input buffer.</param>
/// <param name='output'>A pointer to the beginning of the output buffer.</param>
public unsafe int Decode(byte* input, int length, byte* output)
{
byte* inend = input + length;
byte* outptr = output;
byte* inptr = input;
byte c;
while (inptr < inend) {
switch (state) {
case QpDecoderState.PassThrough:
while (inptr < inend) {
c = *inptr++;
if (c == '=') {
state = QpDecoderState.EqualSign;
break;
} else if (rfc2047 && c == '_') {
*outptr++ = (byte) ' ';
} else {
*outptr++ = c;
}
}
break;
case QpDecoderState.EqualSign:
c = *inptr++;
if (c == '\n') {
// this is a soft break ("=\n")
state = QpDecoderState.PassThrough;
} else {
state = QpDecoderState.DecodeByte;
saved = c;
}
break;
case QpDecoderState.DecodeByte:
c = *inptr++;
if (c.IsXDigit () && saved.IsXDigit ()) {
saved = saved.ToXDigit ();
c = c.ToXDigit ();
*outptr++ = (byte) ((saved << 4) | c);
} else if (saved == '\r' && c == '\n') {
// end-of-line
} else {
// invalid encoded sequence - pass it through undecoded
*outptr++ = (byte) '=';
*outptr++ = saved;
*outptr++ = c;
}
state = QpDecoderState.PassThrough;
break;
}
}
return (int) (outptr - output);
}
/// <summary>
/// Resets the decoder.
/// </summary>
public void Reset()
{
state = QpDecoderState.PassThrough;
saved = 0;
}
/// <summary>
/// Decodes the specified input into the output buffer.
/// </summary>
/// <remarks>
/// <para>Decodes the specified input into the output buffer.</para>
/// <para>The output buffer should be large enough to hold all of the
/// decoded input. For estimating the size needed for the output buffer,
/// see <see cref="M:MimeKit.Encodings.QuotedPrintableDecoder.EstimateOutputLength(System.Int32)" />.</para>
/// </remarks>
/// <returns>The number of bytes written to the output buffer.</returns>
/// <param name="input">A pointer to the beginning of the input buffer.</param>
/// <param name="length">The length of the input buffer.</param>
/// <param name="output">A pointer to the beginning of the output buffer.</param>
public unsafe int Decode(byte *input, int length, byte *output)
{
byte *ptr = input + length;
byte *ptr2 = output;
byte *ptr3 = input;
while (ptr3 < ptr)
{
switch (state)
{
case QpDecoderState.PassThrough:
while (ptr3 < ptr)
{
byte *intPtr6 = ptr3;
ptr3 = intPtr6 + 1;
byte b = *intPtr6;
if (b == 61)
{
state = QpDecoderState.EqualSign;
break;
}
if (rfc2047 && b == 95)
{
byte *intPtr7 = ptr2;
ptr2 = intPtr7 + 1;
*intPtr7 = 32;
}
else
{
byte *intPtr8 = ptr2;
ptr2 = intPtr8 + 1;
*intPtr8 = b;
}
}
break;
case QpDecoderState.EqualSign:
{
byte *intPtr9 = ptr3;
ptr3 = intPtr9 + 1;
byte b = *intPtr9;
if (b.IsXDigit())
{
state = QpDecoderState.DecodeByte;
saved = b;
break;
}
switch (b)
{
case 61:
{
byte *intPtr12 = ptr2;
ptr2 = intPtr12 + 1;
*intPtr12 = 61;
break;
}
case 13:
state = QpDecoderState.SoftBreak;
break;
case 10:
state = QpDecoderState.PassThrough;
break;
default:
{
state = QpDecoderState.PassThrough;
byte *intPtr10 = ptr2;
ptr2 = intPtr10 + 1;
* intPtr10 = 61;
byte *intPtr11 = ptr2;
ptr2 = intPtr11 + 1;
*intPtr11 = b;
break;
}
}
break;
}
case QpDecoderState.SoftBreak:
{
state = QpDecoderState.PassThrough;
byte *intPtr13 = ptr3;
ptr3 = intPtr13 + 1;
byte b = *intPtr13;
if (b != 10)
{
byte *intPtr14 = ptr2;
ptr2 = intPtr14 + 1;
* intPtr14 = 61;
byte *intPtr15 = ptr2;
ptr2 = intPtr15 + 1;
* intPtr15 = 13;
byte *intPtr16 = ptr2;
ptr2 = intPtr16 + 1;
*intPtr16 = b;
}
break;
}
case QpDecoderState.DecodeByte:
{
byte *intPtr = ptr3;
ptr3 = intPtr + 1;
byte b = *intPtr;
if (b.IsXDigit())
{
saved = saved.ToXDigit();
b = b.ToXDigit();
byte *intPtr2 = ptr2;
ptr2 = intPtr2 + 1;
*intPtr2 = (byte)((saved << 4) | b);
}
else
{
byte *intPtr3 = ptr2;
ptr2 = intPtr3 + 1;
* intPtr3 = 61;
byte *intPtr4 = ptr2;
ptr2 = intPtr4 + 1;
* intPtr4 = saved;
byte *intPtr5 = ptr2;
ptr2 = intPtr5 + 1;
*intPtr5 = b;
}
state = QpDecoderState.PassThrough;
break;
}
}
}
return((int)(ptr2 - output));
}
