118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
/* Copyright 1996,1997,1999,2001-2003,2008,2009,2021 Alain Knaff.
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* This file is part of mtools.
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*
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* Mtools is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Mtools is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Mtools. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "sysincludes.h"
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#include "msdos.h"
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#include "mtools.h"
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#include "codepage.h"
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#define U2D_BUFSIZE 4096
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typedef struct Filter_t {
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struct Stream_t head;
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char buffer[U2D_BUFSIZE];
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size_t readBytes; /* how many bytes read into buffer */
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size_t bufPos; /* position in buffer */
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bool pendingNl;
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bool eof;
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} Filter_t;
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/* Add CR before NL, and 0x1a at end of file */
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static ssize_t read_filter(Stream_t *Stream, char *output, size_t len)
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{
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DeclareThis(Filter_t);
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size_t i;
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if(This->eof)
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return 0;
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for(i=0; i < len && !This->eof; i++) {
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char c;
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if(This->pendingNl) {
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c='\n';
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This->pendingNl=false;
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} else {
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if(This->bufPos == This->readBytes) {
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ssize_t ret = READS(This->head.Next,
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This->buffer,
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U2D_BUFSIZE);
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if(ret < 0) {
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/* an error */
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/* If we already have read some data,
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* first return count of that data
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* before returning error */
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if(i == 0)
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return -1;
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else
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break;
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}
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This->readBytes = (size_t) ret;
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This->bufPos = 0;
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}
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if(This->bufPos == This->readBytes) {
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/* Still at end of buffer, must be end
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of file */
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c='\032';
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This->eof=true;
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} else {
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c = This->buffer[This->bufPos++];
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if(c == '\n') {
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This->pendingNl=true;
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c = '\r';
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}
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}
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}
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output[i]=c;
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}
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return (ssize_t) i;
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}
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static Class_t FilterClass = {
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read_filter,
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0,
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0,
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0,
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0, /* flush */
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0,
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0, /* set geometry */
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get_data_pass_through,
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0,
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0, /* get_dosconvert */
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0 /* discard */
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};
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Stream_t *open_unix2dos(Stream_t *Next, int convertCharset UNUSEDP)
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{
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Filter_t *This;
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This = New(Filter_t);
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if (!This)
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return NULL;
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init_head(&This->head, &FilterClass, Next);
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This->readBytes = This->bufPos = 0;
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This->pendingNl = false;
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This->eof = false;
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return &This->head;
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}
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