The Tor Browser: netwerk/cache/nsDiskCacheStreams.h@a63d609f5ebe

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  *

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     8 #ifndef _nsDiskCacheStreams_h_

     9 #define _nsDiskCacheStreams_h_

    11 #include "mozilla/MemoryReporting.h"

    12 #include "nsDiskCacheBinding.h"

    14 #include "nsCache.h"

    16 #include "nsIInputStream.h"

    17 #include "nsIOutputStream.h"

    19 #include "mozilla/Atomics.h"

    21 class nsDiskCacheInputStream;

    22 class nsDiskCacheDevice;

    24 class nsDiskCacheStreamIO : public nsIOutputStream {

    25 public:

    26              nsDiskCacheStreamIO(nsDiskCacheBinding *   binding);

    27     virtual ~nsDiskCacheStreamIO();

    29     NS_DECL_THREADSAFE_ISUPPORTS

    30     NS_DECL_NSIOUTPUTSTREAM

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

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

    35     nsresult    ClearBinding();

    37     void        IncrementInputStreamCount() { mInStreamCount++; }

    38     void        DecrementInputStreamCount()

    39                 {

    40                     mInStreamCount--;

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

    42                 }

    44     size_t     SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);

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

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

    48     nsDiskCacheStreamIO() { NS_NOTREACHED("oops"); }

    50 private:

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

    52     nsresult    ReadCacheBlocks(uint32_t bufferSize);

    53     nsresult    FlushBufferToFile();

    54     void        UpdateFileSize();

    55     void        DeleteBuffer();

    56     nsresult    CloseOutputStream();

    57     nsresult    SeekAndTruncate(uint32_t offset);

    59     nsDiskCacheBinding *        mBinding;       // not an owning reference

    60     nsDiskCacheDevice *         mDevice;

    61     mozilla::Atomic<int32_t>                     mInStreamCount;

    62     PRFileDesc *                mFD;

    64     uint32_t                    mStreamEnd;     // current size of data

    65     uint32_t                    mBufSize;       // current end of buffer

    66     char *                      mBuffer;

    67     bool                        mOutputStreamIsOpen;

    68 };

    70 #endif // _nsDiskCacheStreams_h_

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