зеркало из https://github.com/mozilla/pjs.git
161 строка
5.5 KiB
C
161 строка
5.5 KiB
C
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsCacheEntryDescriptor.h, released
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* February 22, 2001.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gordon Sheridan, 22-February-2001
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef _nsCacheEntryDescriptor_h_
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#define _nsCacheEntryDescriptor_h_
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#include "nsICacheEntryDescriptor.h"
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#include "nsCacheEntry.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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/******************************************************************************
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* nsCacheEntryDescriptor
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*******************************************************************************/
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class nsCacheEntryDescriptor :
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public PRCList,
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public nsICacheEntryDescriptor
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSICACHEENTRYDESCRIPTOR
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NS_DECL_NSICACHEENTRYINFO
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nsCacheEntryDescriptor(nsCacheEntry * entry, nsCacheAccessMode mode);
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virtual ~nsCacheEntryDescriptor();
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/**
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* utility method to attempt changing data size of associated entry
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*/
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nsresult RequestDataSizeChange(PRInt32 deltaSize);
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/**
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* methods callbacks for nsCacheService
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*/
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nsCacheEntry * CacheEntry(void) { return mCacheEntry; }
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void ClearCacheEntry(void) { mCacheEntry = nsnull; }
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private:
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/*************************************************************************
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* input stream wrapper class -
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*
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* The input stream wrapper references the descriptor, but the descriptor
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* doesn't need any references to the stream wrapper.
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*************************************************************************/
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class nsInputStreamWrapper : public nsIInputStream {
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private:
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nsCacheEntryDescriptor * mDescriptor;
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nsCOMPtr<nsIInputStream> mInput;
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PRUint32 mStartOffset;
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PRBool mInitialized;
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIINPUTSTREAM
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nsInputStreamWrapper(nsCacheEntryDescriptor * desc, PRUint32 off)
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: mDescriptor(desc)
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, mStartOffset(off)
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, mInitialized(PR_FALSE)
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{
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NS_ADDREF(mDescriptor);
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}
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virtual ~nsInputStreamWrapper()
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{
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NS_RELEASE(mDescriptor);
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}
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private:
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nsresult LazyInit();
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nsresult EnsureInit() { return mInitialized ? NS_OK : LazyInit(); }
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};
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friend class nsInputStreamWrapper;
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/*************************************************************************
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* output stream wrapper class -
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*
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* The output stream wrapper references the descriptor, but the descriptor
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* doesn't need any references to the stream wrapper.
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*************************************************************************/
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class nsOutputStreamWrapper : public nsIOutputStream {
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private:
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nsCacheEntryDescriptor * mDescriptor;
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nsCOMPtr<nsIOutputStream> mOutput;
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PRUint32 mStartOffset;
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PRBool mInitialized;
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOUTPUTSTREAM
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nsOutputStreamWrapper(nsCacheEntryDescriptor * desc, PRUint32 off)
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: mDescriptor(desc)
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, mStartOffset(off)
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, mInitialized(PR_FALSE)
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{
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NS_ADDREF(mDescriptor); // owning ref
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}
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virtual ~nsOutputStreamWrapper()
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{
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// XXX _HACK_ the storage stream needs this!
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Close();
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NS_RELEASE(mDescriptor);
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}
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private:
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nsresult LazyInit();
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nsresult EnsureInit() { return mInitialized ? NS_OK : LazyInit(); }
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nsresult OnWrite(PRUint32 count);
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};
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friend class nsOutputStreamWrapper;
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private:
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/**
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* nsCacheEntryDescriptor data members
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*/
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nsCacheEntry * mCacheEntry; // we are a child of the entry
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nsCacheAccessMode mAccessGranted;
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};
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#endif // _nsCacheEntryDescriptor_h_
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