зеркало из https://github.com/mozilla/gecko-dev.git
79 строки
2.8 KiB
C++
79 строки
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* The storage stream provides an internal buffer that can be filled by a
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* client using a single output stream. One or more independent input streams
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* can be created to read the data out non-destructively. The implementation
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* uses a segmented buffer internally to avoid realloc'ing of large buffers,
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* with the attendant performance loss and heap fragmentation.
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*/
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#ifndef _nsStorageStream_h_
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#define _nsStorageStream_h_
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#include "nsIStorageStream.h"
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#include "nsIOutputStream.h"
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#include "nsMemory.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Mutex.h"
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#define NS_STORAGESTREAM_CID \
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{ /* 669a9795-6ff7-4ed4-9150-c34ce2971b63 */ \
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0x669a9795, 0x6ff7, 0x4ed4, { \
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0x91, 0x50, 0xc3, 0x4c, 0xe2, 0x97, 0x1b, 0x63 \
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} \
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}
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#define NS_STORAGESTREAM_CONTRACTID "@mozilla.org/storagestream;1"
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class nsSegmentedBuffer;
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class nsStorageStream final : public nsIStorageStream, public nsIOutputStream {
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public:
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nsStorageStream();
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSISTORAGESTREAM
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NS_DECL_NSIOUTPUTSTREAM
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friend class nsStorageInputStream;
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private:
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~nsStorageStream();
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mozilla::Mutex mMutex{"nsStorageStream"};
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nsSegmentedBuffer* mSegmentedBuffer GUARDED_BY(mMutex) = nullptr;
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// All segments, except possibly the last, are of this size. Must be
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// power-of-2
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uint32_t mSegmentSize GUARDED_BY(mMutex) = 0;
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// log2(mSegmentSize)
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uint32_t mSegmentSizeLog2 GUARDED_BY(mMutex) = 0;
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// true, if an un-Close'ed output stream exists
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bool mWriteInProgress GUARDED_BY(mMutex) = false;
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// Last segment # in use, -1 initially
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int32_t mLastSegmentNum GUARDED_BY(mMutex) = -1;
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// Pointer to next byte to be written
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char* mWriteCursor GUARDED_BY(mMutex) = nullptr;
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// Pointer to one byte after end of segment containing the write cursor
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char* mSegmentEnd GUARDED_BY(mMutex) = nullptr;
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// Number of bytes written to stream
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uint32_t mLogicalLength GUARDED_BY(mMutex) = 0;
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// number of input streams actively reading a segment.
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uint32_t mActiveSegmentBorrows GUARDED_BY(mMutex) = 0;
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nsresult SetLengthLocked(uint32_t aLength) REQUIRES(mMutex);
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nsresult Seek(int32_t aPosition) REQUIRES(mMutex);
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uint32_t SegNum(uint32_t aPosition) REQUIRES(mMutex) {
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return aPosition >> mSegmentSizeLog2;
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}
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uint32_t SegOffset(uint32_t aPosition) REQUIRES(mMutex) {
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return aPosition & (mSegmentSize - 1);
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}
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};
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#endif // _nsStorageStream_h_
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