/// <summary>
/// Reads a number of decompressed bytes into the specified byte array.
/// </summary>
/// <param name="buffer">The array to store decompressed bytes.</param>
/// <param name="offset">The byte offset in <paramref name="buffer"/> at which the read bytes will be placed.</param>
/// <param name="count">The maximum number of decompressed bytes to read.</param>
/// <returns>The number of bytes that were read into the byte array.</returns>
public override int Read(byte[] buffer, int offset, int count) {
if (_mode != CompressionMode.Decompress)
throw new InvalidOperationException("Read is only supported in Decompress mode");
EnsureNotDisposed();
ValidateParameters(buffer, offset, count);
int totalWritten = 0;
while (offset < buffer.Length && _lastDecoderState != Brotli.BrotliDecoderResult.BROTLI_DECODER_RESULT_SUCCESS) {
if (_lastDecoderState == Brotli.BrotliDecoderResult.BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT) {
if (_bufferCount > 0 && _bufferOffset != 0) {
Array.Copy(_buffer, _bufferOffset, _buffer, 0, _bufferCount);
}
_bufferOffset = 0;
int numRead = 0;
while (_bufferCount < _buffer.Length && ((numRead = _stream.Read(_buffer, _bufferCount, _buffer.Length - _bufferCount)) > 0)) {
_bufferCount += numRead;
if (_bufferCount > _buffer.Length)
throw new InvalidDataException("Invalid input stream detected, more bytes supplied than expected.");
}
if (_bufferCount <= 0)
break;
}
size_t available_in = _bufferCount;
size_t available_in_old = available_in;
size_t available_out = count;
size_t available_out_old = available_out;
fixed (byte* out_buf_ptr = buffer)
fixed (byte* in_buf_ptr = _buffer) {
byte* in_buf = in_buf_ptr + _bufferOffset;
byte* out_buf = out_buf_ptr + offset;
_lastDecoderState = Brotli.BrotliDecoderDecompressStream(ref _decoderState, &available_in, &in_buf,
&available_out, &out_buf, null);
}
if (_lastDecoderState == Brotli.BrotliDecoderResult.BROTLI_DECODER_RESULT_ERROR)
throw new InvalidDataException("Decompression failed with error code: " + _decoderState.error_code);
size_t bytesConsumed = available_in_old - available_in;
size_t bytesWritten = available_out_old - available_out;
if (bytesConsumed > 0) {
_bufferOffset += (int) bytesConsumed;
_bufferCount -= (int) bytesConsumed;
}
if (bytesWritten > 0) {
totalWritten += (int)bytesWritten;
offset += (int)bytesWritten;
count -= (int)bytesWritten;
}
}
return totalWritten;
}
/// <summary>
/// Reads a number of decompressed bytes into the specified byte array.
/// </summary>
/// <param name="buffer">The array to store decompressed bytes.</param>
/// <param name="offset">The byte offset in <paramref name="buffer"/> at which the read bytes will be placed.</param>
/// <param name="count">The maximum number of decompressed bytes to read.</param>
/// <returns>The number of bytes that were read into the byte array.</returns>
public override int Read(byte[] buffer, int offset, int count)
{
if (_mode != CompressionMode.Decompress)
{
throw new InvalidOperationException("Read is only supported in Decompress mode");
}
EnsureNotDisposed();
ValidateParameters(buffer, offset, count);
bool endOfStream = false;
byte[] in_buf = new byte[0xffff];
size_t available_in = 0, available_out = count;
fixed(byte *in_buf_ptr = in_buf)
fixed(byte *buf_ptr = buffer)
{
byte *next_in = in_buf_ptr;
byte *next_out = buf_ptr + offset;
int total = 0;
while (true)
{
if (_lastDecoderState == Brotli.BrotliDecoderResult.BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT)
{
int len = _stream.Read(in_buf, 0, in_buf.Length);
if (len <= 0)
{
endOfStream = true;
break;
}
available_in = len;
next_in = in_buf_ptr;
}
else if (_lastDecoderState == Brotli.BrotliDecoderResult.BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT)
{
/* Ignore */
}
else
{
endOfStream = true;
break;
}
size_t available_out_old = available_out;
_lastDecoderState = Brotli.BrotliDecoderDecompressStream(ref _decoderState, &available_in,
&next_in, &available_out, &next_out, null);
total += (int)(available_out_old - available_out);
if (total >= count)
{
break;
}
}
if (endOfStream && _lastDecoderState != Brotli.BrotliDecoderResult.BROTLI_DECODER_RESULT_SUCCESS)
{
throw new InvalidDataException("Decompression failed with error code: " + _decoderState.error_code);
}
return(total);
}
}
