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/* Copyright 1996,1997,1999,2001-2003,2008,2009 Alain Knaff.
* This file is part of mtools.
*
* Mtools 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 3 of the License, or
* (at your option) any later version.
*
* Mtools 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 Mtools. If not, see <http://www.gnu.org/licenses/>.
*/
#include "sysincludes.h"
#include "msdos.h"
#include "mtools.h"
#include "codepage.h"
typedef struct Filter_t {
Class_t *Class;
int refs;
Stream_t *Next;
Stream_t *Buffer;
int dospos;
int unixpos;
int mode;
int rw;
int lastchar;
/* int convertCharset; */
} Filter_t;
#define F_READ 1
#define F_WRITE 2
/* read filter filters out messy dos' bizarre end of lines and final 0x1a's */
static int read_filter(Stream_t *Stream, char *buf, mt_off_t iwhere, size_t len)
{
DeclareThis(Filter_t);
int i,j,ret;
unsigned char newchar;
off_t where = truncBytes32(iwhere);
if ( where != This->unixpos ){
fprintf(stderr,"Bad offset\n");
exit(1);
}
if (This->rw == F_WRITE){
fprintf(stderr,"Change of transfer direction!\n");
exit(1);
}
This->rw = F_READ;
ret = READS(This->Next, buf, (mt_off_t) This->dospos, len);
if ( ret < 0 )
return ret;
j = 0;
for (i=0; i< ret; i++){
if ( buf[i] == '\r' )
continue;
if (buf[i] == 0x1a)
break;
newchar = buf[i];
/*
if (This->convertCharset) newchar = contents_to_unix(newchar);
*/
This->lastchar = buf[j++] = newchar;
}
This->dospos += i;
This->unixpos += j;
return j;
}
static int write_filter(Stream_t *Stream, char *buf, mt_off_t iwhere,
size_t len)
{
DeclareThis(Filter_t);
unsigned int i,j;
int ret;
char buffer[1025];
unsigned char newchar;
off_t where = truncBytes32(iwhere);
if(This->unixpos == -1)
return -1;
if (where != This->unixpos ){
fprintf(stderr,"Bad offset\n");
exit(1);
}
if (This->rw == F_READ){
fprintf(stderr,"Change of transfer direction!\n");
exit(1);
}
This->rw = F_WRITE;
j=i=0;
while(i < 1024 && j < len){
if (buf[j] == '\n' ){
buffer[i++] = '\r';
buffer[i++] = '\n';
j++;
continue;
}
newchar = buf[j++];
/*
if (This->convertCharset) newchar = to_dos(newchar);
*/
buffer[i++] = newchar;
}
This->unixpos += j;
ret = force_write(This->Next, buffer, (mt_off_t) This->dospos, i);
if(ret >0 )
This->dospos += ret;
if ( ret != (signed int) i ){
/* no space on target file ? */
This->unixpos = -1;
return -1;
}
return j;
}
static int free_filter(Stream_t *Stream)
{
DeclareThis(Filter_t);
char buffer=0x1a;
/* write end of file */
if (This->rw == F_WRITE)
return force_write(This->Next, &buffer, (mt_off_t) This->dospos, 1);
else
return 0;
}
static Class_t FilterClass = {
read_filter,
write_filter,
0, /* flush */
free_filter,
0, /* set geometry */
get_data_pass_through,
0
};
Stream_t *open_filter(Stream_t *Next, int convertCharset UNUSEDP)
{
Filter_t *This;
This = New(Filter_t);
if (!This)
return NULL;
This->Class = &FilterClass;
This->dospos = This->unixpos = This->rw = 0;
This->Next = Next;
This->refs = 1;
This->Buffer = 0;
/*
This->convertCharset = convertCharset;
*/
return (Stream_t *) This;
}
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