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/********************************************************************************
* *
* B Z F i l e S t r e a m C l a s s e s *
* *
*********************************************************************************
* Copyright (C) 1999,2022 by Lyle Johnson. 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 "FXMutex.h"
#include "FXElement.h"
#include "FXStream.h"
#include "FXString.h"
#include "FXObject.h"
#include "FXFile.h"
#include "FXBZFileStream.h"
#ifdef HAVE_BZ2LIB_H
#include <bzlib.h>
/*
Notes:
- Very basic compressed file I/O only.
- Updated for new stream classes 2003/07/08.
- Updated for use with FXFile 2005/09/03.
*/
#define BLOCKSIZE100K 1 // Block size x 100,000 bytes
#define VERBOSITY 0 // For tracing in bzip library
#define WORKFACTOR 0 // See bzip2 documentation
#define BUFFERSIZE 8192 // Size of the buffer
/*******************************************************************************/
namespace FX {
// Used during compression
struct BZBlock {
bz_stream stream;
char buffer[BUFFERSIZE];
};
// Create BZIP2 file stream
FXBZFileStream::FXBZFileStream(const FXObject* cont):FXFileStream(cont),bz(nullptr),ac(0){
}
// Create and open BZIP2 file stream
FXBZFileStream::FXBZFileStream(const FXString& filename,FXStreamDirection save_or_load,FXuval size):bz(nullptr),ac(0){
open(filename,save_or_load,size);
}
// Save to a file
FXuval FXBZFileStream::writeBuffer(FXuval){
FXival m,n; int bzerror;
if(dir!=FXStreamSave){fxerror("FXBZFileStream::writeBuffer: wrong stream direction.\n");}
FXASSERT(begptr<=rdptr);
FXASSERT(rdptr<=wrptr);
FXASSERT(wrptr<=endptr);
while(rdptr<wrptr || ac==BZ_FINISH || ac==BZ_FLUSH){
bz->stream.next_in=(char*)rdptr;
bz->stream.avail_in=wrptr-rdptr;
bz->stream.next_out=bz->buffer;
bz->stream.avail_out=BUFFERSIZE;
bzerror=BZ2_bzCompress(&bz->stream,ac);
if(bzerror<BZ_OK) break; // Error occurred
m=bz->stream.next_out-bz->buffer;
n=file.writeBlock(bz->buffer,m);
if(n<m) break; // Failed to write data
rdptr=(FXuchar*)bz->stream.next_in;
if(bzerror==BZ_STREAM_END) break; // Finished all data
if(bzerror==BZ_RUN_OK && ac==BZ_FLUSH) break; // Flushed all data
}
if(rdptr<wrptr){memmove(begptr,rdptr,wrptr-rdptr);}
wrptr=begptr+(wrptr-rdptr);
rdptr=begptr;
return endptr-wrptr;
}
// Load from file
FXuval FXBZFileStream::readBuffer(FXuval){
FXival n; int bzerror;
if(dir!=FXStreamLoad){fxerror("FXBZFileStream::readBuffer: wrong stream direction.\n");}
FXASSERT(begptr<=rdptr);
FXASSERT(rdptr<=wrptr);
FXASSERT(wrptr<=endptr);
if(rdptr<wrptr){memmove(begptr,rdptr,wrptr-rdptr);}
wrptr=begptr+(wrptr-rdptr);
rdptr=begptr;
while(wrptr<endptr){
if(bz->stream.avail_in<=0){ // Read more input
n=file.readBlock(bz->buffer,BUFFERSIZE);
if(n<=0) break;
bz->stream.next_in=bz->buffer;
bz->stream.avail_in=n;
}
bz->stream.next_out=(char*)wrptr;
bz->stream.avail_out=endptr-wrptr;
bzerror=BZ2_bzDecompress(&bz->stream);
if(bzerror<BZ_OK) break; // Error occurred
wrptr=(FXuchar*)bz->stream.next_out;
if(bzerror==BZ_STREAM_END) break; // Hit end of file
}
return wrptr-rdptr;
}
// Try open file stream
FXbool FXBZFileStream::open(const FXString& filename,FXStreamDirection save_or_load,FXuval size){
if(FXFileStream::open(filename,save_or_load,size)){
if(callocElms(bz,1)){
int bzerror;
bz->stream.next_in=nullptr;
bz->stream.avail_in=0;
bz->stream.next_out=nullptr;
bz->stream.avail_out=0;
ac=BZ_RUN;
if(save_or_load==FXStreamLoad){
bzerror=BZ2_bzDecompressInit(&bz->stream,VERBOSITY,0);
if(bzerror==BZ_OK) return true;
code=FXStreamNoRead;
}
else{
bzerror=BZ2_bzCompressInit(&bz->stream,BLOCKSIZE100K,VERBOSITY,WORKFACTOR);
if(bzerror==BZ_OK) return true;
code=FXStreamNoWrite;
}
freeElms(bz);
}
FXFileStream::close();
}
return false;
}
// Flush buffer
FXbool FXBZFileStream::flush(){
FXbool result;
int action=ac;
if(ac!=BZ_FINISH) ac=BZ_FLUSH;
result=FXStream::flush();
ac=action;
return result;
}
// Close file stream
FXbool FXBZFileStream::close(){
if(dir){
if(dir==FXStreamLoad){
FXFileStream::close();
BZ2_bzDecompressEnd(&bz->stream);
}
else{
ac=BZ_FINISH;
FXFileStream::close();
BZ2_bzCompressEnd(&bz->stream);
}
freeElms(bz);
return true;
}
return false;
}
// Destructor
FXBZFileStream::~FXBZFileStream(){
close();
}
}
#endif
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