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haio.c
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1995-03-09
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/***********************************************************************
This file is part of HA, a general purpose file archiver.
Copyright (C) 1995 Harri Hirvola
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
************************************************************************
HA I/O routines
***********************************************************************/
#include <stdio.h>
#include "ha.h"
#include "haio.h"
#include "error.h"
#include "haio.h"
#define uppdcrc(_crc,_c) _crc=(crctab[((int)(_crc)^(_c))&0xff]^((_crc)>>8))
#define CRCMASK 0xffffffffUL
#define CRCP 0xEDB88320UL
int infile,outfile;
U32B crc;
U32B crctab[256];
unsigned char ib[BLOCKLEN],ob[BLOCKLEN];
int ibl,ibf,obl;
U32B icnt,ocnt,totalsize;
unsigned char r_crc,w_crc,r_progdisp,w_progdisp;
static int write_on,crctabok=0;
static char *outname=NULL,*inname=NULL;
void (*outspecial)(unsigned char *obuf, unsigned oblen);
unsigned (*inspecial)(unsigned char *ibuf, unsigned iblen);
static void makecrctab(void) {
U16B i,j;
U32B tv;
for (i=0;i<256;i++) {
tv=i;
for (j=8;j>0;j--) {
if (tv&1) tv=(tv>>1)^CRCP;
else tv>>=1;
}
crctab[i]=tv;
}
}
void setoutput(int fh, int mode, char *name) {
outname=name;
outspecial=NULL;
if (fh>=0) write_on=1;
else write_on=0;
obl=0;
ocnt=0;
outfile=fh;
w_crc=mode&CRCCALC;
if (w_crc) {
if (!crctabok) makecrctab();
crc=CRCMASK;
}
w_progdisp=mode&PROGDISP;
}
void setinput(int fh, int mode, char *name) {
inname=name;
inspecial=NULL;
ibl=0;
icnt=0;
infile=fh;
r_crc=mode&CRCCALC;
if (r_crc) {
if (!crctabok) makecrctab();
crc=CRCMASK;
}
r_progdisp=mode&PROGDISP;
}
U32B getcrc(void) {
return crc^CRCMASK;
}
void clearcrc(void) {
crc=CRCMASK;
}
void bread(void) {
register S16B i;
register unsigned char *ptr;
if (inspecial!=NULL) {
ibl=(*inspecial)(ib,BLOCKLEN);
ibf=0;
return;
}
else {
ibl=read(infile,ib,BLOCKLEN);
if (ibl<0) error(1,ERR_READ,inname);
ibf=0;
}
if (ibl) {
icnt+=ibl;
if (r_progdisp) {
printf("%3d %%\b\b\b\b\b",
(int)(icnt*100/(totalsize==0?1:totalsize)));
fflush(stdout);
}
if (r_crc) {
for (i=0,ptr=ib;i<ibl;++i) {
uppdcrc(crc,*(ptr++));
}
}
}
}
void bwrite(void) {
register S16B i;
register unsigned char *ptr;
if (obl) {
if (outspecial!=NULL) {
(*outspecial)(ob,obl);
}
else {
if (write_on && write(outfile,ob,obl)!=obl)
error(1,ERR_WRITE,outname);
ocnt+=obl;
if (w_progdisp) {
printf("%3d %%\b\b\b\b\b",
(int)(ocnt*100/(totalsize==0?1:totalsize)));
fflush(stdout);
}
if (w_crc) {
for (i=0,ptr=ob;i<obl;++i) {
uppdcrc(crc,*(ptr++));
}
}
}
obl=0;
}
}