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151 lines
3.4 KiB
C++
Executable File
151 lines
3.4 KiB
C++
Executable File
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla strings.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author)
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*
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*/
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#ifndef nsBufferHandle_h___
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#define nsBufferHandle_h___
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/**
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*
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*/
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template <class CharT>
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class nsBufferHandle
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{
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public:
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ptrdiff_t
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DataLength() const
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{
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return mDataEnd - mDataStart;
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}
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const CharT*
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DataStart() const
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{
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return mDataStart;
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}
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const CharT*
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DataEnd() const
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{
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return mDataEnd;
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}
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protected:
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const CharT* mDataStart;
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const CharT* mDataEnd;
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};
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/**
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*
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*/
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template <class CharT>
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class nsSharedBufferHandle
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: public nsStringFragmentHandle<CharT>
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{
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protected:
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enum
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{
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kIsShared = 1<<31,
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kIsSingleAllocationWithBuffer = 1<<30,
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kIsStorageDefinedSeparately = 1<<29,
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kFlagsMask = kIsShared | kIsSingleAllocationWithBuffer | kIsStorageDefinedSeparately,
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kRefCountMask = ~kFlagsMask
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};
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public:
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~nsSharedBufferHandle();
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void
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AcquireReference() const
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{
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set_refcount( get_refcount()+1 );
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}
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void
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ReleaseReference() const
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{
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if ( !set_refcount( get_refcount()-1 ) )
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delete this;
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}
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PRBool
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IsReferenced() const
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{
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return get_refcount() != 0;
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}
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protected:
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PRUint32 mFlags;
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PRUint32
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get_refcount() const
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{
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return mFlags & kRefCountMask;
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}
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PRUint32
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set_refcount( PRUint32 aNewRefCount )
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{
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NS_ASSERTION(aNewRefCount <= kRefCountMask, "aNewRefCount <= kRefCountMask");
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mFlags = (mFlags & kFlagsMask) | aNewRefCount;
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return aNewRefCount;
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}
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};
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// need a name for this
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template <class CharT>
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class nsXXXBufferHandle
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: public nsSharedBufferHandle<CharT>
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{
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public:
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nsXXXBufferHandle() { mFlags |= kIsStorageDefinedSeparately; }
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protected:
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const CharT* mStorageStart;
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const CharT* mStorageEnd;
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};
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template <class CharT>
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nsSharedBufferHandle<CharT>::~nsSharedBufferHandle()
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// really don't want this to be |inline|
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{
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NS_ASSERTION(!IsReferenced(), "!IsReferenced()");
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if ( !(mFlags & kIsSingleAllocationWithBuffer) )
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{
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CharT* string_storage = mDataStart;
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if ( mFlags & kIsStorageDefinedSeparately )
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string_storage = NS_STATIC_CAST(nsXXXBufferHandle*, this)->mStorageStart;
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nsMemory::Free(string_storage);
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}
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}
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#endif // !defined(nsBufferHandle_h___)
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