mirror of
https://github.com/mozilla/gecko-dev.git
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142 lines
3.6 KiB
C++
142 lines
3.6 KiB
C++
/* -*- 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 Netscape 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/NPL/
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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.org code.
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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) 1998 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@netscape.com>
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*/
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#ifndef _nsSharedString_h__
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#define _nsSharedString_h__
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// WORK IN PROGRESS
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#include "nsAReadableString.h"
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template <class CharT>
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class basic_nsSharedString
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: public basic_nsAReadableString<CharT>
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/*
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...
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*/
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{
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private:
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~basic_nsSharedString() { }
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// You can't sub-class me, or make an instance of me on the stack
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// operator delete
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public:
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virtual const CharT* GetReadableFragment( nsReadableFragment<CharT>&, nsFragmentRequest, PRUint32 ) const;
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virtual
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PRUint32
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Length() const
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{
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return mLength;
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}
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basic_nsSharedString( const CharT* data, size_t length )
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: mRefCount(0), mData(data), mLength(length)
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{
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// nothing else to do here
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}
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nsrefcnt
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AddRef() const
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{
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return ++mRefCount;
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}
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nsrefcnt
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Release() const
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{
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nsrefcnt result = --mRefCount;
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if ( !mRefCount )
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delete this;
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return result;
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}
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private:
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mutable nsrefcnt mRefCount;
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const CharT* mData;
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size_t mLength;
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};
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NS_DEF_STRING_COMPARISONS(basic_nsSharedString<CharT>)
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template <class CharT>
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const CharT*
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basic_nsSharedString<CharT>::GetReadableFragment( nsReadableFragment<CharT>& aFragment, nsFragmentRequest aRequest, PRUint32 anOffset ) const
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{
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switch ( aRequest )
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{
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case kFirstFragment:
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case kLastFragment:
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case kFragmentAt:
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aFragment.mEnd = (aFragment.mStart = mData) + mLength;
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return aFragment.mStart + anOffset;
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case kPrevFragment:
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case kNextFragment:
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default:
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return 0;
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}
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}
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template <class CharT>
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class nsSharedStringPtr
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{
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public:
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// ...
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private:
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basic_nsSharedString<CharT>* mPtr;
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};
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template <class CharT>
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basic_nsSharedString<CharT>*
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new_nsSharedString( const basic_nsAReadableString<CharT>& aReadable )
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{
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size_t object_size = ((sizeof(basic_nsSharedString<CharT>) + sizeof(CharT) - 1) / sizeof(CharT)) * sizeof(CharT);
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size_t string_length = aReadable.Length();
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size_t string_size = string_length * sizeof(CharT);
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void* object_ptr = operator new(object_size + string_size);
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if ( object_ptr )
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{
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typedef CharT* CharT_ptr;
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CharT* string_ptr = CharT_ptr(NS_STATIC_CAST(unsigned char*, object_ptr) + object_size);
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string_copy(aReadable.BeginReading(), aReadable.EndReading(), string_ptr);
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return new (object_ptr) basic_nsSharedString<CharT>(string_ptr, string_length);
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}
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return 0;
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}
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typedef basic_nsSharedString<PRUnichar> nsSharedString;
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typedef basic_nsSharedString<char> nsSharedCString;
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#endif // !defined(_nsSharedString_h__)
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