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// Copyright (c) 2012 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 ANDROID_WEBVIEW_BROWSER_INPUT_STREAM_H_
#define ANDROID_WEBVIEW_BROWSER_INPUT_STREAM_H_
#include "base/basictypes.h"
namespace net {
class IOBuffer;
}
namespace android_webview {
// Abstract wrapper used to access the InputStream Java class.
// This class is safe to pass around between threads (the destructor,
// constructor and methods can be called on different threads) but calling
// methods concurrently might have undefined results.
class InputStream {
public:
virtual ~InputStream() {}
// Sets |bytes_available| to the number of bytes that can be read (or skipped
// over) from this input stream without blocking by the next caller of a
// method for this input stream.
// Returns true if completed successfully or false if an exception was
// thrown.
virtual bool BytesAvailable(int* bytes_available) const = 0;
// Skips over and discards |n| bytes of data from this input stream. Sets
// |bytes_skipped| to the number of of bytes skipped.
// Returns true if completed successfully or false if an exception was
// thrown.
virtual bool Skip(int64_t n, int64_t* bytes_skipped) = 0;
// Reads at most |length| bytes into |dest|. Sets |bytes_read| to the total
// number of bytes read into |dest| or 0 if there is no more data because the
// end of the stream was reached.
// |dest| must be at least |length| in size.
// Returns true if completed successfully or false if an exception was
// thrown.
virtual bool Read(net::IOBuffer* dest, int length, int* bytes_read) = 0;
protected:
InputStream() {}
};
} // namespace android_webview
#endif // ANDROID_WEBVIEW_BROWSER_INPUT_STREAM_H_
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