150 lines
4.3 KiB
C++
150 lines
4.3 KiB
C++
/* ***** 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 [Open Source Virtual Machine.].
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*
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* The Initial Developer of the Original Code is
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* Adobe System Incorporated.
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* Portions created by the Initial Developer are Copyright (C) 2004-2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Adobe AS3 Team
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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 __avmplus_ScriptBuffer__
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#define __avmplus_ScriptBuffer__
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namespace avmplus
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{
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/**
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* ScriptBufferImpl is the base class for script buffer
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* implementations.
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*
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* This is a pure base class which must be subclassed to be used.
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* Its methods are not virtual for performance reasons.
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* For default script buffer behavior, use BasicScriptBufferImpl.
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*/
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class ScriptBufferImpl
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{
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public:
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operator byte* () const { return buffer; }
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size_t getSize() const { return size; }
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byte* getBuffer() const { return (byte*)buffer; }
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byte operator[] (int index) const {
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return buffer[index];
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}
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byte& operator[] (int index) {
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return buffer[index];
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}
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protected:
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byte *buffer;
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size_t size;
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};
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/**
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* BasicScriptBufferImpl is a ScriptBuffer implementation that
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* owns its own buffer and has no external dependencies.
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*/
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class BasicScriptBufferImpl : public ScriptBufferImpl
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{
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public:
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BasicScriptBufferImpl(size_t _size) {
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this->size = _size;
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buffer = (byte*)(this+1);
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}
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// override to skip memset and prevent marking
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static void *operator new(size_t size, MMgc::GC *gc, size_t extra = 0)
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{
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return gc->Alloc(size + extra, 0, 4);
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}
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};
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/**
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* ReadOnlyScriptBufferImpl is a ScriptBuffer implementation that
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* points to an external buffer that must stay around longer than
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* the script buffer itself.
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*/
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class ReadOnlyScriptBufferImpl : public ScriptBufferImpl
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{
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public:
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ReadOnlyScriptBufferImpl(const byte * _buf, size_t _size) {
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this->size = _size;
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this->buffer = (byte*) _buf;
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}
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};
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/**
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* ScriptBuffer is a "handle" for ScriptBufferImpl which is more convenient
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* to pass around and use than a ScriptBufferImpl pointer. It defines
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* operator[] to make a ScriptBuffer look like an array.
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*/
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class ScriptBuffer
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{
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public:
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ScriptBuffer() {
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m_impl = NULL;
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}
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ScriptBuffer(ScriptBufferImpl* rep) {
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m_impl = rep;
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}
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ScriptBuffer(const ScriptBuffer& toCopy) {
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m_impl = toCopy.m_impl;
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}
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ScriptBuffer& operator= (const ScriptBuffer& toCopy) {
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m_impl = toCopy.m_impl;
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return *this;
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}
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ScriptBufferImpl* getImpl() const {
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return m_impl;
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}
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operator ScriptBufferImpl*() const {
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return m_impl;
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}
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operator byte* () const {
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return m_impl->getBuffer();
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}
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size_t getSize() const {
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return m_impl->getSize();
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}
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byte* getBuffer() const {
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return m_impl->getBuffer();
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}
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byte operator[] (int index) const {
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return (*m_impl)[index];
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}
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byte& operator[] (int index) {
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return (*m_impl)[index];
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}
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private:
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ScriptBufferImpl* m_impl;
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};
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}
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#endif /* __avmplus_ScriptBuffer__ */
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