diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:49:04 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 16:49:04 +0000 |
commit | 16f504a9dca3fe3b70568f67b7d41241ae485288 (patch) | |
tree | c60f36ada0496ba928b7161059ba5ab1ab224f9d /src/libs/xpcom18a4/xpcom/io/nsStorageStream.h | |
parent | Initial commit. (diff) | |
download | virtualbox-16f504a9dca3fe3b70568f67b7d41241ae485288.tar.xz virtualbox-16f504a9dca3fe3b70568f67b7d41241ae485288.zip |
Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/libs/xpcom18a4/xpcom/io/nsStorageStream.h')
-rw-r--r-- | src/libs/xpcom18a4/xpcom/io/nsStorageStream.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/io/nsStorageStream.h b/src/libs/xpcom18a4/xpcom/io/nsStorageStream.h new file mode 100644 index 00000000..0729c01c --- /dev/null +++ b/src/libs/xpcom18a4/xpcom/io/nsStorageStream.h @@ -0,0 +1,98 @@ +/* -*- 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_ |