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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkFrontBufferedStream_DEFINED
#define SkFrontBufferedStream_DEFINED
#include "SkStream.h"
/**
* Specialized stream that buffers the first X bytes of a stream,
* where X is passed in by the user. Note that unlike some buffered
* stream APIs, once more bytes than can fit in the buffer are read,
* no more buffering is done. This stream is designed for a use case
* where the caller knows that rewind will only be called from within
* X bytes (inclusive), and the wrapped stream is not necessarily
* able to rewind at all.
*/
class SkFrontBufferedStream {
public:
/**
* Creates a new stream that wraps and buffers an SkStream.
* @param stream SkStream to buffer. If stream is NULL, NULL is
* returned. When this call succeeds (i.e. returns non NULL),
* SkFrontBufferedStream is expected to be the only owner of
* stream, so it should no be longer used directly.
* SkFrontBufferedStream will delete stream upon deletion.
* @param minBufferSize Minimum size of buffer required.
* @return An SkStream that can buffer at least minBufferSize, or
* NULL on failure. The caller is required to delete when finished with
* this object.
*/
static std::unique_ptr<SkStreamRewindable> Make(std::unique_ptr<SkStream> stream,
size_t minBufferSize);
#ifdef SK_SUPPORT_LEGACY_STREAM_API
static SkStreamRewindable* Create(SkStream* stream, size_t minBufferSize) {
return Make(std::unique_ptr<SkStream>(stream), minBufferSize).release();
}
#endif
};
#endif // SkFrontBufferedStream_DEFINED
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