/* [<][>][^][v][top][bottom][index][help] */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is [Open Source Virtual Machine.].
*
* The Initial Developer of the Original Code is
* Adobe System Incorporated.
* Portions created by the Initial Developer are Copyright (C) 2004-2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Adobe AS3 Team
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef __avmplus_ScriptBuffer__
#define __avmplus_ScriptBuffer__
namespace avmplus
{
/**
* ScriptBufferImpl is the base class for script buffer
* implementations.
*
* This is a pure base class which must be subclassed to be used.
* Its methods are not virtual for performance reasons.
* For default script buffer behavior, use BasicScriptBufferImpl.
*/
class ScriptBufferImpl : public MMgc::GCFinalizedObject
{
public:
operator byte* () const { return buffer; }
size_t getSize() const { return size; }
byte* getBuffer() const { return (byte*)buffer; }
byte operator[] (int index) const {
return buffer[index];
}
byte& operator[] (int index) {
return buffer[index];
}
bool isConstant() const { return constantData; }
protected:
ScriptBufferImpl(bool isConstant)
: constantData(isConstant) {}
byte *buffer;
size_t size;
const bool constantData;
};
/**
* BasicScriptBufferImpl is a ScriptBuffer implementation that
* owns its own buffer and has no external dependencies.
*/
class BasicScriptBufferImpl : public ScriptBufferImpl
{
public:
BasicScriptBufferImpl(size_t _size)
: ScriptBufferImpl(false)
{
this->size = _size;
buffer = (byte*)(this+1);
}
// override to skip memset and prevent marking
static void *operator new(size_t size, MMgc::GC *gc, size_t extra = 0)
{
return gc->Alloc(size + extra, 0);
}
};
/**
* ReadOnlyScriptBufferImpl is a ScriptBuffer implementation that
* points to an external buffer that must stay around longer than
* the script buffer itself.
*/
class ReadOnlyScriptBufferImpl : public ScriptBufferImpl
{
public:
ReadOnlyScriptBufferImpl(const byte * _buf, size_t _size)
: ScriptBufferImpl(false)
{
this->size = _size;
this->buffer = (byte*) _buf;
}
};
/**
* ConstDataScriptBufferImpl is a ScriptBuffer implementation that
* points to an a buffer that is in the executable's constant data
* segment and can't be unloaded.
*/
class ConstDataScriptBufferImpl : public ScriptBufferImpl
{
public:
ConstDataScriptBufferImpl(const byte * _buf, size_t _size)
: ScriptBufferImpl(true)
{
this->size = _size;
this->buffer = (byte*) _buf;
}
};
/**
* ScriptBuffer is a "handle" for ScriptBufferImpl which is more convenient
* to pass around and use than a ScriptBufferImpl pointer. It defines
* operator[] to make a ScriptBuffer look like an array.
*/
class ScriptBuffer
{
public:
ScriptBuffer() {
m_impl = NULL;
}
ScriptBuffer(ScriptBufferImpl* rep) {
m_impl = rep;
}
ScriptBuffer(const ScriptBuffer& toCopy) {
m_impl = toCopy.m_impl;
}
ScriptBuffer& operator= (const ScriptBuffer& toCopy) {
m_impl = toCopy.m_impl;
return *this;
}
ScriptBufferImpl* getImpl() const {
return m_impl;
}
operator ScriptBufferImpl*() const {
return m_impl;
}
operator byte* () const {
return m_impl->getBuffer();
}
size_t getSize() const {
return m_impl->getSize();
}
byte* getBuffer() const {
return m_impl->getBuffer();
}
byte operator[] (int index) const {
return (*m_impl)[index];
}
byte& operator[] (int index) {
return (*m_impl)[index];
}
private:
ScriptBufferImpl* m_impl;
};
}
#endif /* __avmplus_ScriptBuffer__ */