private void WriteCore(byte[] buffer, int offset, int count, Brotli.BrotliEncoderOperation operation) {
bool flush = operation == Brotli.BrotliEncoderOperation.BROTLI_OPERATION_FLUSH ||
operation == Brotli.BrotliEncoderOperation.BROTLI_OPERATION_FINISH;
byte[] out_buf = new byte[0x1FFFE];
size_t available_in = count, available_out = out_buf.Length;
fixed (byte* out_buf_ptr = out_buf)
fixed (byte* buf_ptr = buffer) {
byte* next_in = buf_ptr + offset;
byte* next_out = out_buf_ptr;
while ((!flush && available_in > 0) || flush) {
if (!Brotli.BrotliEncoderCompressStream(ref _encoderState,
operation, &available_in, &next_in,
&available_out, &next_out, null)) {
throw new InvalidDataException("Compression failed");
}
bool hasData = available_out != out_buf.Length;
if (hasData) {
int out_size = (int)(out_buf.Length - available_out);
_stream.Write(out_buf, 0, out_size);
available_out = out_buf.Length;
next_out = out_buf_ptr;
}
if (Brotli.BrotliEncoderIsFinished(ref _encoderState))
break;
if (!hasData && flush)
break;
}
}
}
private void FlushCompress(bool finish) {
if (_mode != CompressionMode.Compress)
return;
if (Brotli.BrotliEncoderIsFinished(ref _encoderState))
return;
var op = finish
? Brotli.BrotliEncoderOperation.BROTLI_OPERATION_FINISH
: Brotli.BrotliEncoderOperation.BROTLI_OPERATION_FLUSH;
byte[] buffer = new byte[0];
WriteCore(buffer, 0, 0, op);
}