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/* Copyright 1996,1997,1999,2001-2003,2008,2009,2021 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"
#define U2D_BUFSIZE 4096
typedef struct Filter_t {
struct Stream_t head;
char buffer[U2D_BUFSIZE];
size_t readBytes; /* how many bytes read into buffer */
size_t bufPos; /* position in buffer */
bool pendingNl;
bool eof;
} Filter_t;
/* Add CR before NL, and 0x1a at end of file */
static ssize_t read_filter(Stream_t *Stream, char *output, size_t len)
{
DeclareThis(Filter_t);
size_t i;
if(This->eof)
return 0;
for(i=0; i < len && !This->eof; i++) {
char c;
if(This->pendingNl) {
c='\n';
This->pendingNl=false;
} else {
if(This->bufPos == This->readBytes) {
ssize_t ret = READS(This->head.Next,
This->buffer,
U2D_BUFSIZE);
if(ret < 0) {
/* an error */
/* If we already have read some data,
* first return count of that data
* before returning error */
if(i == 0)
return -1;
else
break;
}
This->readBytes = (size_t) ret;
This->bufPos = 0;
}
if(This->bufPos == This->readBytes) {
/* Still at end of buffer, must be end
of file */
c='\032';
This->eof=true;
} else {
c = This->buffer[This->bufPos++];
if(c == '\n') {
This->pendingNl=true;
c = '\r';
}
}
}
output[i]=c;
}
return (ssize_t) i;
}
static Class_t FilterClass = {
read_filter,
0,
0,
0,
0, /* flush */
0,
0, /* set geometry */
get_data_pass_through,
0,
0, /* get_dosconvert */
0 /* discard */
};
Stream_t *open_unix2dos(Stream_t *Next, int convertCharset UNUSEDP)
{
Filter_t *This;
This = New(Filter_t);
if (!This)
return NULL;
init_head(&This->head, &FilterClass, Next);
This->readBytes = This->bufPos = 0;
This->pendingNl = false;
This->eof = false;
return &This->head;
}
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