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/********************************************************************************
* *
* M e m o r y S t r e a m C l a s s e s *
* *
*********************************************************************************
* Copyright (C) 1997,2022 by Jeroen van der Zijp. All Rights Reserved. *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/> *
********************************************************************************/
#include "xincs.h"
#include "fxver.h"
#include "fxdefs.h"
#include "fxmath.h"
#include "FXArray.h"
#include "FXHash.h"
#include "FXStream.h"
#include "FXElement.h"
#include "FXString.h"
#include "FXObject.h"
#include "FXStream.h"
#include "FXMemoryStream.h"
/*
Notes:
- Also need memory mapped file stream.
*/
using namespace FX;
/*******************************************************************************/
namespace FX {
// Create memory stream
FXMemoryStream::FXMemoryStream(const FXObject* cont):FXStream(cont){
}
// Create and open memory stream
FXMemoryStream::FXMemoryStream(FXStreamDirection save_or_load,FXuchar* data,FXuval size,FXbool owned){
open(save_or_load,data,size,owned);
}
// Write at least count bytes from the buffer
FXuval FXMemoryStream::writeBuffer(FXuval count){
if(owns){ setSpace(getSpace()+count); }
return endptr-wrptr;
}
// Read at least count bytes into the buffer
FXuval FXMemoryStream::readBuffer(FXuval){
return wrptr-rdptr;
}
// Open a stream, possibly with initial data array of certain size
FXbool FXMemoryStream::open(FXStreamDirection save_or_load,FXuchar* data,FXuval size,FXbool owned){
if(save_or_load!=FXStreamSave && save_or_load!=FXStreamLoad){fxerror("FXMemoryStream::open: illegal stream direction.\n");}
if(FXStream::open(save_or_load,data,size,owned)){
if(save_or_load==FXStreamSave){
wrptr=begptr;
rdptr=begptr;
}
else{
wrptr=endptr;
rdptr=begptr;
}
return true;
}
return false;
}
// Take buffer away from stream
void FXMemoryStream::takeBuffer(FXuchar*& data,FXuval& size){
data=begptr;
size=endptr-begptr;
begptr=nullptr;
wrptr=nullptr;
rdptr=nullptr;
endptr=nullptr;
owns=false;
}
// Give buffer to stream
void FXMemoryStream::giveBuffer(FXuchar *data,FXuval size){
if(data==nullptr){ fxerror("FXMemoryStream::giveBuffer: NULL buffer argument.\n"); }
if(owns){freeElms(begptr);}
begptr=data;
endptr=data+size;
if(dir==FXStreamSave){
wrptr=begptr;
rdptr=begptr;
}
else{
wrptr=endptr;
rdptr=begptr;
}
owns=true;
}
// Move to position; if saving and we own the buffer, try to resize
// and 0-fill the space; if loading and not out of range, move the pointer;
// otherwise, return error code.
FXbool FXMemoryStream::position(FXlong offset,FXWhence whence){
if(dir==FXStreamDead){ fxerror("FXMemoryStream::position: stream is not open.\n"); }
if(code==FXStreamOK){
if(whence==FXFromCurrent) offset=offset+pos;
else if(whence==FXFromEnd) offset=offset+(endptr-begptr);
if(dir==FXStreamSave){
if(begptr+offset>endptr){
if(!owns){ setError(FXStreamFull); return false; }
setSpace(offset);
if(begptr+offset>endptr) return false;
}
wrptr=begptr+offset;
}
else{
if(begptr+offset>endptr){ setError(FXStreamEnd); return false; }
rdptr=begptr+offset;
}
pos=offset;
return true;
}
return false;
}
// Destructor
FXMemoryStream::~FXMemoryStream(){
close();
}
}
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