зеркало из https://github.com/mozilla/pjs.git
163 строки
4.5 KiB
C++
Executable File
163 строки
4.5 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 XPCOM.
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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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* Original Author:
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* Scott Collins <scc@mozilla.org>
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*
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* Contributor(s):
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*/
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#include "nsFragmentedString.h"
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const PRUnichar*
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nsFragmentedString::GetReadableFragment( nsReadableFragment<PRUnichar>& aFragment, nsFragmentRequest aRequest, PRUint32 aOffset ) const
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{
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const nsSharedBufferList::Buffer* buffer = 0;
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switch ( aRequest )
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{
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case kPrevFragment:
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buffer = NS_STATIC_CAST(const nsSharedBufferList::Buffer*, aFragment.mFragmentIdentifier)->mPrev;
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break;
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case kFirstFragment:
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buffer = mBufferList.GetFirstBuffer();
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break;
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case kLastFragment:
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buffer = mBufferList.GetLastBuffer();
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break;
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case kNextFragment:
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buffer = NS_STATIC_CAST(const nsSharedBufferList::Buffer*, aFragment.mFragmentIdentifier)->mNext;
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break;
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case kFragmentAt:
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// ...work...
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break;
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}
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if ( buffer )
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{
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aFragment.mStart = buffer->DataStart();
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aFragment.mEnd = buffer->DataEnd();
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aFragment.mFragmentIdentifier = buffer;
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return aFragment.mStart + aOffset;
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}
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return 0;
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}
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PRUnichar*
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nsFragmentedString::GetWritableFragment( nsWritableFragment<PRUnichar>& aFragment, nsFragmentRequest aRequest, PRUint32 aOffset )
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{
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nsSharedBufferList::Buffer* buffer = 0;
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switch ( aRequest )
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{
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case kPrevFragment:
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buffer = NS_STATIC_CAST(nsSharedBufferList::Buffer*, aFragment.mFragmentIdentifier)->mPrev;
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break;
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case kFirstFragment:
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buffer = mBufferList.GetFirstBuffer();
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break;
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case kLastFragment:
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buffer = mBufferList.GetLastBuffer();
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break;
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case kNextFragment:
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buffer = NS_STATIC_CAST(nsSharedBufferList::Buffer*, aFragment.mFragmentIdentifier)->mNext;
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break;
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case kFragmentAt:
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// ...work...
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break;
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}
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if ( buffer )
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{
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aFragment.mStart = buffer->DataStart();
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aFragment.mEnd = buffer->DataEnd();
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aFragment.mFragmentIdentifier = buffer;
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return aFragment.mStart + aOffset;
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}
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return 0;
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}
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/**
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* ...
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*/
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PRUint32
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nsFragmentedString::Length() const
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{
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return PRUint32(mBufferList.GetDataLength());
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}
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/**
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* |SetLength|
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*/
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void
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nsFragmentedString::SetLength( PRUint32 aNewLength )
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{
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// according to the current interpretation of |SetLength|,
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// cut off characters from the end, or else add unitialized space to fill
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if ( aNewLength < mBufferList.GetDataLength() )
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{
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// if ( aNewLength )
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mBufferList.DiscardSuffix(mBufferList.GetDataLength()-aNewLength);
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// else
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// mBufferList.DestroyBuffers();
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}
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// temporarily... eliminate as soon as our munging routines don't need this form of |SetLength|
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else if ( aNewLength > mBufferList.GetDataLength() )
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{
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size_t empty_space_to_add = aNewLength - mBufferList.GetDataLength();
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nsSharedBufferList::Buffer* new_buffer = nsSharedBufferList::NewSingleAllocationBuffer(0, 0, empty_space_to_add);
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new_buffer->DataEnd(new_buffer->DataStart()+empty_space_to_add);
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mBufferList.LinkBuffer(mBufferList.GetLastBuffer(), new_buffer, 0);
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}
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}
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#if 0
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/**
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* |SetCapacity|.
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*
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* If a client tries to increase the capacity of multi-fragment string, perhaps a single
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* empty fragment of the appropriate size should be appended.
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*/
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void
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nsFragmentedString::SetCapacity( PRUint32 aNewCapacity )
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{
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if ( !aNewCapacity )
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{
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// |SetCapacity(0)| is special and means ``release all storage''.
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}
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else if ( aNewCapacity > ... )
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{
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}
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}
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#endif
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