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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsBufferedStreams_h__
#define nsBufferedStreams_h__
#include "nsIBufferedStreams.h"
#include "nsIInputStream.h"
#include "nsIOutputStream.h"
#include "nsISafeOutputStream.h"
#include "nsISeekableStream.h"
#include "nsIStreamBufferAccess.h"
#include "nsCOMPtr.h"
#include "nsIIPCSerializableInputStream.h"
////////////////////////////////////////////////////////////////////////////////
class nsBufferedStream : public nsISeekableStream
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSISEEKABLESTREAM
nsBufferedStream();
nsresult Close();
protected:
virtual ~nsBufferedStream();
nsresult Init(nsISupports* stream, uint32_t bufferSize);
NS_IMETHOD Fill() = 0;
NS_IMETHOD Flush() = 0;
uint32_t mBufferSize;
char* mBuffer;
// mBufferStartOffset is the offset relative to the start of mStream.
int64_t mBufferStartOffset;
// mCursor is the read cursor for input streams, or write cursor for
// output streams, and is relative to mBufferStartOffset.
uint32_t mCursor;
// mFillPoint is the amount available in the buffer for input streams,
// or the high watermark of bytes written into the buffer, and therefore
// is relative to mBufferStartOffset.
uint32_t mFillPoint;
nsISupports* mStream; // cast to appropriate subclass
bool mBufferDisabled;
bool mEOF; // True if mStream is at EOF
uint8_t mGetBufferCount;
};
////////////////////////////////////////////////////////////////////////////////
class nsBufferedInputStream : public nsBufferedStream,
public nsIBufferedInputStream,
public nsIStreamBufferAccess,
public nsIIPCSerializableInputStream
{
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSIBUFFEREDINPUTSTREAM
NS_DECL_NSISTREAMBUFFERACCESS
NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
nsBufferedInputStream() : nsBufferedStream() {}
static nsresult
Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
nsIInputStream* Source() {
return (nsIInputStream*)mStream;
}
protected:
virtual ~nsBufferedInputStream() {}
NS_IMETHOD Fill() override;
NS_IMETHOD Flush() override { return NS_OK; } // no-op for input streams
};
////////////////////////////////////////////////////////////////////////////////
class nsBufferedOutputStream final : public nsBufferedStream,
public nsISafeOutputStream,
public nsIBufferedOutputStream,
public nsIStreamBufferAccess
{
public:
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_NSIOUTPUTSTREAM
NS_DECL_NSISAFEOUTPUTSTREAM
NS_DECL_NSIBUFFEREDOUTPUTSTREAM
NS_DECL_NSISTREAMBUFFERACCESS
nsBufferedOutputStream() : nsBufferedStream() {}
static nsresult
Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
nsIOutputStream* Sink() {
return (nsIOutputStream*)mStream;
}
protected:
virtual ~nsBufferedOutputStream() { nsBufferedOutputStream::Close(); }
NS_IMETHOD Fill() override { return NS_OK; } // no-op for output streams
nsCOMPtr<nsISafeOutputStream> mSafeStream; // QI'd from mStream
};
////////////////////////////////////////////////////////////////////////////////
#endif // nsBufferedStreams_h__
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