// Reset the Decoder
//
// Normally if we call GetChars() and an error is thrown we don't change the state of the Decoder. This
// would allow the caller to correct the error condition and try again (such as if they need a bigger buffer.)
//
// If the caller doesn't want to try again after GetChars() throws an error, then they need to call Reset().
//
// Virtual implementation has to call GetChars with flush and a big enough buffer to clear a 0 byte string
// We avoid GetMaxCharCount() because a) we can't call the base encoder and b) it might be really big.
public virtual void Reset()
{
byte[] byteTemp = Array.Empty <byte>();
char[] charTemp = new char[GetCharCount(byteTemp, 0, 0, true)];
GetChars(byteTemp, 0, 0, charTemp, 0, true);
_fallbackBuffer?.Reset();
}
public virtual void Reset()
{
if (fallback_buffer != null)
{
fallback_buffer.Reset();
}
}
public override void Reset()
{
if (m_fallbackBuffer != null)
{
m_fallbackBuffer.Reset();
}
}
public virtual void Reset()
{
byte[] byteTemp = {};
char[] charTemp = new char[GetCharCount(byteTemp, 0, 0, true)];
GetChars(byteTemp, 0, 0, charTemp, 0, true);
if (m_fallbackBuffer != null)
{
m_fallbackBuffer.Reset();
}
}
internal unsafe void InternalReset()
{
byteStart = null;
_fallbackBuffer.Reset();
}
// for GetChars()
static unsafe void Fallback (object provider, ref DecoderFallbackBuffer buffer, ref byte [] bufferArg, byte* bytes, long byteIndex, uint size,
char* chars, ref int charIndex)
{
if (buffer == null) {
DecoderFallback fb = provider as DecoderFallback;
if (fb != null)
buffer = fb.CreateFallbackBuffer ();
else
buffer = ((Decoder) provider).FallbackBuffer;
}
if (bufferArg == null)
bufferArg = new byte [1];
for (int i = 0; i < size; i++) {
bufferArg [0] = bytes [byteIndex + i];
buffer.Fallback (bufferArg, 0);
while (buffer.Remaining > 0)
chars [charIndex++] = buffer.GetNextChar ();
buffer.Reset ();
}
}
// for GetCharCount()
static unsafe int Fallback (object provider, ref DecoderFallbackBuffer buffer, ref byte [] bufferArg, byte* bytes, long index, uint size)
{
if (buffer == null) {
DecoderFallback fb = provider as DecoderFallback;
if (fb != null)
buffer = fb.CreateFallbackBuffer ();
else
buffer = ((Decoder) provider).FallbackBuffer;
}
if (bufferArg == null)
bufferArg = new byte [1];
int ret = 0;
for (int i = 0; i < size; i++) {
bufferArg [0] = bytes [(int) index + i];
buffer.Fallback (bufferArg, 0);
ret += buffer.Remaining;
buffer.Reset ();
}
return ret;
}
public override void Reset()
{
m_fallbackBuffer?.Reset();
}
// This function is called when we want to flush the decoder state
// (i.e. in case of invalid UTF-8 characters or interrupted sequences)
internal unsafe static DecoderStatus InternalGetCharsFlush (
char* chars, int charCount,
DecoderFallbackBuffer fallbackBuffer,
DecoderStatus s,
int bytesProcessed, ref int charsProcessed,
ref uint leftBytes, ref uint leftBits, ref uint procBytes)
{
// if there is nothing to flush, then exit silently
if(procBytes == 0)
return DecoderStatus.Ok;
// now we build a 'bytesUnknown' array with the
// stored bytes in 'procBytes'.
int extra = 0;
for (uint t = procBytes; t != 0; extra++)
t = t >> 8;
byte [] bytesUnknown = new byte [extra];
for (int i = extra; i > 0; i--)
bytesUnknown [i - 1] = (byte) ((procBytes >> (8 * (extra - i))) & 0xff);
// partial reset: this condition avoids infinite loops
if (s == DecoderStatus.InvalidSequence)
leftBytes = 0;
// call the fallback and cross fingers
fallbackBuffer.Fallback (bytesUnknown, bytesProcessed - extra);
if (chars != null) {
while (fallbackBuffer.Remaining > 0) {
if (charsProcessed >= charCount)
return DecoderStatus.InsufficientSpace;
chars [charsProcessed++] = fallbackBuffer.GetNextChar ();
}
} else
charsProcessed += fallbackBuffer.Remaining;
fallbackBuffer.Reset ();
// recovery was succesful, flush decoder state
leftBits = leftBytes = procBytes = 0;
return DecoderStatus.Ok;
}
