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/********************************************************************************
* *
* F i l e S t r e a m C l a s 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 "FXString.h"
#include "FXStream.h"
#include "FXObject.h"
#include "FXFile.h"
#include "FXFileStream.h"
/*
Notes:
- Future verions will use native system calls under WIN32.
*/
using namespace FX;
/*******************************************************************************/
namespace FX {
// Create file stream
FXFileStream::FXFileStream(const FXObject* cont):FXStream(cont){
}
// Create and open file stream
FXFileStream::FXFileStream(const FXString& filename,FXStreamDirection save_or_load,FXuval size){
open(filename,save_or_load,size);
}
// Write at least count bytes from the buffer
FXuval FXFileStream::writeBuffer(FXuval){
FXival m,n;
if(dir!=FXStreamSave){fxerror("FXFileStream::writeBuffer: wrong stream direction.\n");}
FXASSERT(begptr<=rdptr);
FXASSERT(rdptr<=wrptr);
FXASSERT(wrptr<=endptr);
m=wrptr-rdptr;
n=file.writeBlock(rdptr,m);
if(0<n){
m-=n;
if(m){memmove(begptr,rdptr+n,m);}
rdptr=begptr;
wrptr=begptr+m;
}
return endptr-wrptr;
}
// Read at least count bytes into the buffer
FXuval FXFileStream::readBuffer(FXuval){
FXival m,n;
if(dir!=FXStreamLoad){fxerror("FXFileStream::readBuffer: wrong stream direction.\n");}
FXASSERT(begptr<=rdptr);
FXASSERT(rdptr<=wrptr);
FXASSERT(wrptr<=endptr);
m=wrptr-rdptr;
if(m){memmove(begptr,rdptr,m);}
rdptr=begptr;
wrptr=begptr+m;
n=file.readBlock(wrptr,endptr-wrptr);
if(0<n){
wrptr+=n;
}
return wrptr-rdptr;
}
// Open file stream
FXbool FXFileStream::open(const FXString& filename,FXStreamDirection save_or_load,FXuval size){
if(save_or_load!=FXStreamSave && save_or_load!=FXStreamLoad){fxerror("FXFileStream::open: illegal stream direction.\n");}
if(!dir){
if(save_or_load==FXStreamLoad){
if(!file.open(filename,FXIO::Reading)){
code=FXStreamNoRead;
return false;
}
}
else if(save_or_load==FXStreamSave){
if(!file.open(filename,FXIO::Writing)){
code=FXStreamNoWrite;
return false;
}
}
return FXStream::open(save_or_load,nullptr,size);
}
return false;
}
// Close file stream
FXbool FXFileStream::close(){
if(dir){
if(dir==FXStreamSave) flush();
file.close();
return FXStream::close();
}
return false;
}
// Move to position
FXbool FXFileStream::position(FXlong offset,FXWhence whence){
FXlong p;
if(dir==FXStreamDead){ fxerror("FXFileStream::position: stream is not open.\n"); }
if(code==FXStreamOK){
FXASSERT(FXFromStart==SEEK_SET);
FXASSERT(FXFromCurrent==SEEK_CUR);
FXASSERT(FXFromEnd==SEEK_END);
if(dir==FXStreamSave){
// Flush unwritten data
writeBuffer(0);
// System's view of file pointer lags behind ours
if(whence==FXFromCurrent) offset+=wrptr-rdptr;
// Position file
if((p=file.position(offset,whence))<0){
code=FXStreamFull;
return false;
}
// Update pointers
wrptr=begptr;
rdptr=begptr;
}
else{
// System's view of file pointer ahead of ours
if(whence==FXFromCurrent) offset-=wrptr-rdptr;
// Position file
if((p=file.position(offset,whence))<0){
code=FXStreamEnd;
return false;
}
// Update pointers
wrptr=begptr;
rdptr=begptr;
}
pos=p;
return true;
}
return false;
}
// Close file stream
FXFileStream::~FXFileStream(){
close();
}
}
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