| /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| * ***** BEGIN LICENSE BLOCK ***** |
| * Version: MPL 1.1/GPL 2.0/LGPL 2.1 |
| * |
| * The contents of this file are subject to the Mozilla Public License Version |
| * 1.1 (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * http://www.mozilla.org/MPL/ |
| * |
| * Software distributed under the License is distributed on an "AS IS" basis, |
| * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License |
| * for the specific language governing rights and limitations under the |
| * License. |
| * |
| * The Original Code is Mozilla Communicator client code, released |
| * March 31, 1998. |
| * |
| * The Initial Developer of the Original Code is |
| * Netscape Communications Corporation. |
| * Portions created by the Initial Developer are Copyright (C) 1998-1999 |
| * the Initial Developer. All Rights Reserved. |
| * |
| * Contributor(s): |
| * |
| * Alternatively, the contents of this file may be used under the terms of |
| * either of the GNU General Public License Version 2 or later (the "GPL"), |
| * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), |
| * in which case the provisions of the GPL or the LGPL are applicable instead |
| * of those above. If you wish to allow use of your version of this file only |
| * under the terms of either the GPL or the LGPL, and not to allow others to |
| * use your version of this file under the terms of the MPL, indicate your |
| * decision by deleting the provisions above and replace them with the notice |
| * and other provisions required by the GPL or the LGPL. If you do not delete |
| * the provisions above, a recipient may use your version of this file under |
| * the terms of any one of the MPL, the GPL or the LGPL. |
| * |
| * ***** END LICENSE BLOCK ***** */ |
| |
| /* |
| * The storage stream provides an internal buffer that can be filled by a |
| * client using a single output stream. One or more independent input streams |
| * can be created to read the data out non-destructively. The implementation |
| * uses a segmented buffer internally to avoid realloc'ing of large buffers, |
| * with the attendant performance loss and heap fragmentation. |
| */ |
| |
| #ifndef _nsStorageStream_h_ |
| #define _nsStorageStream_h_ |
| |
| #include "nsIStorageStream.h" |
| #include "nsIOutputStream.h" |
| #include "nsMemory.h" |
| |
| #define NS_STORAGESTREAM_CID \ |
| { /* 669a9795-6ff7-4ed4-9150-c34ce2971b63 */ \ |
| 0x669a9795, \ |
| 0x6ff7, \ |
| 0x4ed4, \ |
| {0x91, 0x50, 0xc3, 0x4c, 0xe2, 0x97, 0x1b, 0x63} \ |
| } |
| |
| #define NS_STORAGESTREAM_CONTRACTID "@mozilla.org/storagestream;1" |
| #define NS_STORAGESTREAM_CLASSNAME "Storage Stream" |
| |
| class nsSegmentedBuffer; |
| |
| class nsStorageStream : public nsIStorageStream, |
| public nsIOutputStream |
| { |
| public: |
| nsStorageStream(); |
| |
| NS_DECL_ISUPPORTS |
| NS_DECL_NSISTORAGESTREAM |
| NS_DECL_NSIOUTPUTSTREAM |
| |
| friend class nsStorageInputStream; |
| |
| private: |
| ~nsStorageStream(); |
| |
| nsSegmentedBuffer* mSegmentedBuffer; |
| PRUint32 mSegmentSize; // All segments, except possibly the last, are of this size |
| // Must be power-of-2 |
| PRUint32 mSegmentSizeLog2; // log2(mSegmentSize) |
| PRBool mWriteInProgress; // true, if an un-Close'ed output stream exists |
| PRInt32 mLastSegmentNum; // Last segment # in use, -1 initially |
| char* mWriteCursor; // Pointer to next byte to be written |
| char* mSegmentEnd; // Pointer to one byte after end of segment |
| // containing the write cursor |
| PRUint32 mLogicalLength; // Number of bytes written to stream |
| |
| NS_METHOD Seek(PRInt32 aPosition); |
| PRUint32 SegNum(PRUint32 aPosition) {return aPosition >> mSegmentSizeLog2;} |
| PRUint32 SegOffset(PRUint32 aPosition) {return aPosition & (mSegmentSize - 1);} |
| }; |
| |
| #endif // _nsStorageStream_h_ |