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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.
*/
#include "SkData.h"
#include "SkStream.h"
#ifndef FakeStreams_DEFINED
#define FakeStreams_DEFINED
// Stream that is not an asset stream (!hasPosition() or !hasLength())
class NotAssetMemStream : public SkStream {
public:
NotAssetMemStream(sk_sp<SkData> data) : fStream(std::move(data)) {}
bool hasPosition() const override {
return false;
}
bool hasLength() const override {
return false;
}
size_t peek(void* buf, size_t bytes) const override {
return fStream.peek(buf, bytes);
}
size_t read(void* buf, size_t bytes) override {
return fStream.read(buf, bytes);
}
bool rewind() override {
return fStream.rewind();
}
bool isAtEnd() const override {
return fStream.isAtEnd();
}
private:
SkMemoryStream fStream;
};
/*
* Represents a stream without all of its data.
*/
class HaltingStream : public SkStream {
public:
HaltingStream(sk_sp<SkData> data, size_t initialLimit)
: fTotalSize(data->size())
, fLimit(initialLimit)
, fStream(std::move(data))
{}
void addNewData(size_t extra) {
fLimit = SkTMin(fTotalSize, fLimit + extra);
}
size_t read(void* buffer, size_t size) override {
if (fStream.getPosition() + size > fLimit) {
size = fLimit - fStream.getPosition();
}
return fStream.read(buffer, size);
}
bool isAtEnd() const override {
return fStream.isAtEnd();
}
bool hasLength() const override { return true; }
size_t getLength() const override { return fLimit; }
bool hasPosition() const override { return true; }
size_t getPosition() const override { return fStream.getPosition(); }
bool rewind() override { return fStream.rewind(); }
bool move(long offset) override { return fStream.move(offset); }
bool seek(size_t position) override { return fStream.seek(position); }
bool isAllDataReceived() const { return fLimit == fTotalSize; }
private:
const size_t fTotalSize;
size_t fLimit;
SkMemoryStream fStream;
};
#endif // FakeStreams_DEFINED
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