/* -*- Mode: C++; tab-width: 4; 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 _nsDiskCacheStreams_h_

#define _nsDiskCacheStreams_h_

#include "mozilla/MemoryReporting.h"

#include "nsDiskCacheBinding.h"

#include "nsCache.h"

#include "nsIInputStream.h"

#include "nsIOutputStream.h"

#include "mozilla/Atomics.h"

class nsDiskCacheDevice;

class nsDiskCacheStreamIO : public nsIOutputStream {

public:

    explicit nsDiskCacheStreamIO(nsDiskCacheBinding *   binding);

    NS_DECL_THREADSAFE_ISUPPORTS

    NS_DECL_NSIOUTPUTSTREAM

    nsresult    GetInputStream(uint32_t offset, nsIInputStream ** inputStream);

    nsresult    GetOutputStream(uint32_t offset, nsIOutputStream ** outputStream);

    nsresult    ClearBinding();

    void        IncrementInputStreamCount() { mInStreamCount++; }

    void        DecrementInputStreamCount()

                {

                    mInStreamCount--;

                    NS_ASSERTION(mInStreamCount >= 0, "mInStreamCount has gone negative");

                }

    size_t     SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);

    // GCC 2.95.2 requires this to be defined, although we never call it.

    // and OS/2 requires that it not be private

    nsDiskCacheStreamIO()

        : mBinding(nullptr),

          mDevice(nullptr),

          mFD(nullptr),

          mStreamEnd(0),

          mBufSize(0),

          mBuffer(nullptr),

          mOutputStreamIsOpen(false)

    {

        MOZ_ASSERT_UNREACHABLE("oops");

    }

private:

    virtual ~nsDiskCacheStreamIO();

    nsresult    OpenCacheFile(int flags, PRFileDesc ** fd);

    nsresult    ReadCacheBlocks(uint32_t bufferSize);

    nsresult    FlushBufferToFile();

    void        UpdateFileSize();

    void        DeleteBuffer();

    nsresult    CloseOutputStream();

    nsresult    SeekAndTruncate(uint32_t offset);

    nsDiskCacheBinding *        mBinding;       // not an owning reference

    nsDiskCacheDevice *         mDevice;

    mozilla::Atomic<int32_t>                     mInStreamCount;

    PRFileDesc *                mFD;

    uint32_t                    mStreamEnd;     // current size of data

    uint32_t                    mBufSize;       // current end of buffer

    char *                      mBuffer;

    bool                        mOutputStreamIsOpen;

};

#endif // _nsDiskCacheStreams_h_