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// Copyright 2008, Google Inc.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//  2. Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//  3. Neither the name of Google Inc. nor the names of its contributors may be
//     used to endorse or promote products derived from this software without
//     specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef GEARS_BLOB_BLOB_INPUT_STREAM_SF__
#define GEARS_BLOB_BLOB_INPUT_STREAM_SF__

#import <Foundation/NSStream.h>

#include "gears/base/common/common.h"

class BlobInterface;

// BlobInputStream provides an NSInputStream interface for blobs.
@interface BlobInputStream : NSInputStream {
 @private
  BlobInterface* blob_;
  int64 offset_;
  id delegate_;  // WEAK, not retained

  // Since various undocumented methods get called on a stream, we'll
  // use a 1-byte dummy stream object to handle all unexpected messages.
  NSInputStream *dummy_stream_;
  NSData *dummy_data_;
}

#pragma mark Public Instance methods

// Initializes a BlobInputStream with a blob.
- (id)initFromBlob:(BlobInterface *)blob;

// Replaces the stream's current blob (if any) with the argument.
// The argument can be NULL.
- (void)reset:(BlobInterface *)blob;

@end
#endif  // GEARS_BLOB_BLOB_INPUT_STREAM_SF__