/// <summary>This is a facade method for the decoding operation.</summary>
/// <remarks>
/// This is a facade method for the decoding operation.
/// <p>
/// This method decodes the remaining byte sequence of the given byte buffer
/// into a new character buffer. This method performs a complete decoding
/// operation, resets at first, then decodes, and flushes at last.
/// <p>
/// This method should not be invoked while another
/// <code>decode</code>
/// operation
/// is ongoing.
/// </remarks>
/// <param name="in">the input buffer.</param>
/// <returns>
/// a new <code>CharBuffer</code> containing the the characters
/// produced by this decoding operation. The buffer's limit will be
/// the position of the last character in the buffer, and the
/// position will be zero.
/// </returns>
/// <exception cref="System.InvalidOperationException">if another decoding operation is ongoing.
/// </exception>
/// <exception cref="MalformedInputException">
/// if an illegal input byte sequence for this charset was
/// encountered, and the action for malformed error is
/// <see cref="CodingErrorAction.REPORT">CodingErrorAction.REPORT</see>
/// </exception>
/// <exception cref="UnmappableCharacterException">
/// if a legal but unmappable input byte sequence for this
/// charset was encountered, and the action for unmappable
/// character error is
/// <see cref="CodingErrorAction.REPORT">CodingErrorAction.REPORT</see>
/// .
/// Unmappable means the byte sequence at the input buffer's
/// current position cannot be mapped to a Unicode character
/// sequence.
/// </exception>
/// <exception cref="CharacterCodingException">if another exception happened during the decode operation.
/// </exception>
/// <exception cref="java.nio.charset.CharacterCodingException"></exception>
public java.nio.CharBuffer decode(java.nio.ByteBuffer @in)
{
reset();
int length = (int)(@in.remaining() * _averageCharsPerByte);
java.nio.CharBuffer output = java.nio.CharBuffer.allocate(length);
java.nio.charset.CoderResult result = null;
while (true)
{
result = decode(@in, output, false);
checkCoderResult(result);
if (result.isUnderflow())
{
break;
}
else
{
if (result.isOverflow())
{
output = allocateMore(output);
}
}
}
result = decode(@in, output, true);
checkCoderResult(result);
while (true)
{
result = flush(output);
checkCoderResult(result);
if (result.isOverflow())
{
output = allocateMore(output);
}
else
{
break;
}
}
output.flip();
status = FLUSH;
return(output);
}
/// <exception cref="System.IO.IOException"></exception>
private void drainEncoder()
{
// Strictly speaking, I think it's part of the CharsetEncoder contract that you call
// encode with endOfInput true before flushing. Our ICU-based implementations don't
// actually need this, and you'd hope that any reasonable implementation wouldn't either.
// CharsetEncoder.encode doesn't actually pass the boolean through to encodeLoop anyway!
java.nio.CharBuffer chars = java.nio.CharBuffer.allocate(0);
while (true)
{
java.nio.charset.CoderResult result = encoder.encode(chars, bytes, true);
if (result.isError())
{
result.throwException();
}
else
{
if (result.isOverflow())
{
flushBytes(false);
continue;
}
}
break;
}
// Some encoders (such as ISO-2022-JP) have stuff to write out after all the
// characters (such as shifting back into a default state). In our implementation,
// this is actually the first time ICU is told that we've run out of input.
java.nio.charset.CoderResult result_1 = encoder.flush(bytes);
while (!result_1.isUnderflow())
{
if (result_1.isOverflow())
{
flushBytes(false);
result_1 = encoder.flush(bytes);
}
else
{
result_1.throwException();
}
}
}
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);
}
}
/// <summary>
/// Decodes bytes starting at the current position of the given input buffer,
/// and writes the equivalent character sequence into the given output buffer
/// from its current position.
/// </summary>
/// <remarks>
/// Decodes bytes starting at the current position of the given input buffer,
/// and writes the equivalent character sequence into the given output buffer
/// from its current position.
/// <p>
/// The buffers' position will be changed with the reading and writing
/// operation, but their limits and marks will be kept intact.
/// <p>
/// A <code>CoderResult</code> instance will be returned according to
/// following rules:
/// <ul>
/// <li>
/// <see cref="CoderResult.OVERFLOW">CoderResult.OVERFLOW</see>
/// indicates that
/// even though not all of the input has been processed, the buffer the
/// output is being written to has reached its capacity. In the event of this
/// code being returned this method should be called once more with an
/// <code>out</code> argument that has not already been filled.</li>
/// <li>
/// <see cref="CoderResult.UNDERFLOW">CoderResult.UNDERFLOW</see>
/// indicates that
/// as many bytes as possible in the input buffer have been decoded. If there
/// is no further input and no remaining bytes in the input buffer then this
/// operation may be regarded as complete. Otherwise, this method should be
/// called once more with additional input.</li>
/// <li>A
/// <see cref="CoderResult.malformedForLength(int)">malformed input</see>
/// result
/// indicates that some malformed input error has been encountered, and the
/// erroneous bytes start at the input buffer's position and their number can
/// be got by result's
/// <see cref="CoderResult.length()">length</see>
/// . This kind of
/// result can be returned only if the malformed action is
/// <see cref="CodingErrorAction.REPORT">CodingErrorAction.REPORT</see>
/// . </li>
/// <li>A
/// <see cref="CoderResult.unmappableForLength(int)">unmappable character</see>
/// result indicates that some unmappable character error has been
/// encountered, and the erroneous bytes start at the input buffer's position
/// and their number can be got by result's
/// <see cref="CoderResult.length()">length</see>
/// . This kind of result can be returned
/// only if the unmappable character action is
/// <see cref="CodingErrorAction.REPORT">CodingErrorAction.REPORT</see>
/// . </li>
/// </ul>
/// <p>
/// The <code>endOfInput</code> parameter indicates that the invoker cannot
/// provide further input. This parameter is true if and only if the bytes in
/// current input buffer are all inputs for this decoding operation. Note
/// that it is common and won't cause an error if the invoker sets false and
/// then can't provide more input, while it may cause an error if the invoker
/// always sets true in several consecutive invocations. This would make the
/// remaining input to be treated as malformed input.
/// <p>
/// This method invokes the
/// <see cref="decodeLoop(java.nio.ByteBuffer, java.nio.CharBuffer)">decodeLoop</see>
/// method to
/// implement the basic decode logic for a specific charset.
/// </remarks>
/// <param name="in">the input buffer.</param>
/// <param name="out">the output buffer.</param>
/// <param name="endOfInput">true if all the input characters have been provided.</param>
/// <returns>
/// a <code>CoderResult</code> instance which indicates the reason
/// of termination.
/// </returns>
/// <exception cref="System.InvalidOperationException">
/// if decoding has started or no more input is needed in this
/// decoding progress.
/// </exception>
/// <exception cref="CoderMalfunctionError">
/// if the
/// <see cref="decodeLoop(java.nio.ByteBuffer, java.nio.CharBuffer)">decodeLoop</see>
/// method threw an <code>BufferUnderflowException</code> or
/// <code>BufferOverflowException</code>.
/// </exception>
public java.nio.charset.CoderResult decode(java.nio.ByteBuffer @in, java.nio.CharBuffer
@out, bool endOfInput)
{
if ((status == FLUSH) || (!endOfInput && status == END))
{
throw new System.InvalidOperationException();
}
java.nio.charset.CoderResult result = null;
// begin to decode
while (true)
{
java.nio.charset.CodingErrorAction action = null;
try
{
result = decodeLoop(@in, @out);
}
catch (java.nio.BufferOverflowException ex)
{
// unexpected exception
throw new java.nio.charset.CoderMalfunctionError(ex);
}
catch (java.nio.BufferUnderflowException ex)
{
// unexpected exception
throw new java.nio.charset.CoderMalfunctionError(ex);
}
if (result.isUnderflow())
{
int remaining = @in.remaining();
status = endOfInput ? END : ONGOING;
if (endOfInput && remaining > 0)
{
result = java.nio.charset.CoderResult.malformedForLength(remaining);
}
else
{
return(result);
}
}
if (result.isOverflow())
{
return(result);
}
// set coding error handle action
action = _malformedInputAction;
if (result.isUnmappable())
{
action = _unmappableCharacterAction;
}
// If the action is IGNORE or REPLACE, we should continue decoding.
if (action == java.nio.charset.CodingErrorAction.REPLACE)
{
if (@out.remaining() < replacementChars.Length)
{
return(java.nio.charset.CoderResult.OVERFLOW);
}
@out.put(replacementChars);
}
else
{
if (action != java.nio.charset.CodingErrorAction.IGNORE)
{
return(result);
}
}
@in.position(@in.position() + result.length());
}
}