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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkStreamBuffer_DEFINED
#define SkStreamBuffer_DEFINED
#include "SkStream.h"
#include "SkTypes.h"
/**
* Helper class for reading from a stream that may not have all its data
* available yet.
*
* Used by GIFImageReader, and currently set up for that use case.
*
* Buffers up to 256 * 3 bytes (256 colors, with 3 bytes each) to support GIF.
* FIXME (scroggo): Make this more general purpose?
*/
class SkStreamBuffer : SkNoncopyable {
public:
// Takes ownership of the SkStream.
SkStreamBuffer(SkStream*);
/**
* Return a pointer the buffered data.
*
* The number of bytes buffered is the sum of values returned by calls to
* buffer() since the last call to flush().
*/
const char* get() const { SkASSERT(fBytesBuffered >= 1); return fBuffer; }
/**
* Bytes in the buffer.
*
* Sum of the values returned by calls to buffer() since the last call to
* flush().
*/
size_t bytesBuffered() const { return fBytesBuffered; }
/**
* Buffer from the stream into our buffer.
*
* Returns the number of bytes successfully buffered.
*/
size_t buffer(size_t bytes);
/**
* Flush the buffer.
*
* After this call, no bytes are buffered.
*/
void flush() {
fBytesBuffered = 0;
}
private:
static constexpr size_t kMaxSize = 256 * 3;
std::unique_ptr<SkStream> fStream;
char fBuffer[kMaxSize];
size_t fBytesBuffered;
};
#endif // SkStreamBuffer_DEFINED
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