The Tor Browser / file comparison
comparison: xpcom/io/nsStorageStream.h
xpcom/io/nsStorageStream.h
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
equal
deleted
inserted
replaced
| -1:000000000000 | 0:61cd5b567877 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* | |
| 7 * The storage stream provides an internal buffer that can be filled by a | |
| 8 * client using a single output stream. One or more independent input streams | |
| 9 * can be created to read the data out non-destructively. The implementation | |
| 10 * uses a segmented buffer internally to avoid realloc'ing of large buffers, | |
| 11 * with the attendant performance loss and heap fragmentation. | |
| 12 */ | |
| 13 | |
| 14 #ifndef _nsStorageStream_h_ | |
| 15 #define _nsStorageStream_h_ | |
| 16 | |
| 17 #include "nsIStorageStream.h" | |
| 18 #include "nsIOutputStream.h" | |
| 19 #include "nsMemory.h" | |
| 20 #include "mozilla/Attributes.h" | |
| 21 | |
| 22 #define NS_STORAGESTREAM_CID \ | |
| 23 { /* 669a9795-6ff7-4ed4-9150-c34ce2971b63 */ \ | |
| 24 0x669a9795, \ | |
| 25 0x6ff7, \ | |
| 26 0x4ed4, \ | |
| 27 {0x91, 0x50, 0xc3, 0x4c, 0xe2, 0x97, 0x1b, 0x63} \ | |
| 28 } | |
| 29 | |
| 30 #define NS_STORAGESTREAM_CONTRACTID "@mozilla.org/storagestream;1" | |
| 31 | |
| 32 class nsSegmentedBuffer; | |
| 33 | |
| 34 class nsStorageStream MOZ_FINAL : public nsIStorageStream, | |
| 35 public nsIOutputStream | |
| 36 { | |
| 37 public: | |
| 38 nsStorageStream(); | |
| 39 | |
| 40 NS_DECL_THREADSAFE_ISUPPORTS | |
| 41 NS_DECL_NSISTORAGESTREAM | |
| 42 NS_DECL_NSIOUTPUTSTREAM | |
| 43 | |
| 44 friend class nsStorageInputStream; | |
| 45 | |
| 46 private: | |
| 47 ~nsStorageStream(); | |
| 48 | |
| 49 nsSegmentedBuffer* mSegmentedBuffer; | |
| 50 uint32_t mSegmentSize; // All segments, except possibly the last, are of this size | |
| 51 // Must be power-of-2 | |
| 52 uint32_t mSegmentSizeLog2; // log2(mSegmentSize) | |
| 53 bool mWriteInProgress; // true, if an un-Close'ed output stream exists | |
| 54 int32_t mLastSegmentNum; // Last segment # in use, -1 initially | |
| 55 char* mWriteCursor; // Pointer to next byte to be written | |
| 56 char* mSegmentEnd; // Pointer to one byte after end of segment | |
| 57 // containing the write cursor | |
| 58 uint32_t mLogicalLength; // Number of bytes written to stream | |
| 59 | |
| 60 NS_METHOD Seek(int32_t aPosition); | |
| 61 uint32_t SegNum(uint32_t aPosition) {return aPosition >> mSegmentSizeLog2;} | |
| 62 uint32_t SegOffset(uint32_t aPosition) {return aPosition & (mSegmentSize - 1);} | |
| 63 }; | |
| 64 | |
| 65 #endif // _nsStorageStream_h_ |
