// default implementation is empty
/// <summary>
/// Checks if the given argument is legal as this encoder's replacement byte
/// array.
/// </summary>
/// <remarks>
/// Checks if the given argument is legal as this encoder's replacement byte
/// array.
/// The given byte array is legal if and only if it can be decode into
/// sixteen bits Unicode characters.
/// This method can be overridden for performance improvement.
/// </remarks>
/// <param name="replacement">the given byte array to be checked.</param>
/// <returns>
/// true if the the given argument is legal as this encoder's
/// replacement byte array.
/// </returns>
public virtual bool isLegalReplacement(byte[] replacement_1)
{
if (decoder == null)
{
decoder = cs.newDecoder();
decoder.onMalformedInput(java.nio.charset.CodingErrorAction.REPORT);
decoder.onUnmappableCharacter(java.nio.charset.CodingErrorAction.REPORT);
}
java.nio.ByteBuffer @in = java.nio.ByteBuffer.wrap(replacement_1);
java.nio.CharBuffer @out = java.nio.CharBuffer.allocate((int)(replacement_1.Length
* decoder.maxCharsPerByte()));
java.nio.charset.CoderResult result = decoder.decode(@in, @out, true);
return(!result.isError());
}
public override int read(char[] buffer, int offset, int length)
{
lock (@lock)
{
if (!isOpen())
{
throw new System.IO.IOException("InputStreamReader is closed");
}
java.util.Arrays.checkOffsetAndCount(buffer.Length, offset, length);
if (length == 0)
{
return(0);
}
java.nio.CharBuffer @out = java.nio.CharBuffer.wrap(buffer, offset, length);
java.nio.charset.CoderResult result = java.nio.charset.CoderResult.UNDERFLOW;
// bytes.remaining() indicates number of bytes in buffer
// when 1-st time entered, it'll be equal to zero
bool needInput = !bytes.hasRemaining();
while (@out.hasRemaining())
{
// fill the buffer if needed
if (needInput)
{
try
{
if (@in.available() == 0 && @out.position() > offset)
{
// we could return the result without blocking read
break;
}
}
catch (System.IO.IOException)
{
}
// available didn't work so just try the read
int desiredByteCount = bytes.capacity() - bytes.limit();
int off = bytes.arrayOffset() + bytes.limit();
int actualByteCount = @in.read(((byte[])bytes.array()), off, desiredByteCount);
if (actualByteCount == -1)
{
endOfInput = true;
break;
}
else
{
if (actualByteCount == 0)
{
break;
}
}
bytes.limit(bytes.limit() + actualByteCount);
needInput = false;
}
// decode bytes
result = decoder.decode(bytes, @out, false);
if (result.isUnderflow())
{
// compact the buffer if no space left
if (bytes.limit() == bytes.capacity())
{
bytes.compact();
bytes.limit(bytes.position());
bytes.position(0);
}
needInput = true;
}
else
{
break;
}
}
if (result == java.nio.charset.CoderResult.UNDERFLOW && endOfInput)
{
result = decoder.decode(bytes, @out, true);
decoder.flush(@out);
decoder.reset();
}
if (result.isMalformed() || result.isUnmappable())
{
result.throwException();
}
return(@out.position() - offset == 0 ? -1 : @out.position() - offset);
}
}
