zlib decompression for chromoting

remoting/base/decompressor.h

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef REMOTING_BASE_DECOMPRESSOR_H_
+#define REMOTING_BASE_DECOMPRESSOR_H_
+
+#include "base/basictypes.h"
+
+namespace remoting {
+
+// An object to decompress data losslessly. This is used in pair with
+// a compressor.
+//
+// Note that a decompressor can only be used on one stream during its
+// lifetime. This object should be destroyed after use.
+class Decompressor {
+ public:
+  virtual ~Decompressor() {}
+
+  // Decompress |input_data| with |input_size| bytes.
+  //
+  // |output_data| is provided by the caller and |output_size| is the
+  // size of |output_data|. |output_size| must be greater than 0.
+  //
+  // Decompressed data is written to |output_data|. |consumed| will
+  // contain the number of bytes consumed from the input. |written|
+  // contains the number of bytes written to output.
+  //
+  // Returns true if this method needs to be called again because
+  // there is more bytes to be decompressed or more input data is
+  // needed.
+  virtual bool Process(const uint8* input_data, int input_size,
+                       uint8* output_data, int output_size,
+                       int* consumed, int* written) = 0;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_BASE_DECOMPRESSOR_H_