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/* -*- mode: c; c-file-style: "bsd" -*-
* $Id$
*
* librsync/filebuf.c -- Abstract read to and from FILE* buffers.
Copyright (C) 1999, 2000 by Martin Pool.
Copyright (C) 1999 by tridge@samba.org.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* To walk on water you've
gotta sink in the ice.
-- Shihad, `The General Electric'. */
#include "includes.h"
#include "hsync.h"
#include "private.h"
#include "compress.h"
const int filebuf_tag = 24031976;
struct file_buf {
int dogtag;
int fd, fd_cache;
};
/* This is deprecated because we'd rather not use FILE* */
hs_filebuf_t *
hs_filebuf_from_file(FILE *fp)
{
return hs_filebuf_from_fd(fileno(fp));
}
hs_filebuf_t *
hs_filebuf_from_fd(int fd)
{
hs_filebuf_t *fb;
fb = calloc(1, sizeof(hs_filebuf_t));
return_val_if_fail(fb, NULL);
fb->dogtag = filebuf_tag;
fb->fd = fd;
fb->fd_cache = -1;
return fb;
}
void
hs_filebuf_add_cache(hs_filebuf_t *fb, int fd_cache)
{
assert(fb); assert(fb->dogtag == filebuf_tag);
fb->fd_cache = fd_cache;
}
/* TODO: Add matching close/free function. */
hs_filebuf_t *
hs_filebuf_open(char const *filename, int mode)
{
int fd;
fd = hs_file_open(filename, mode);
if (fd == -1)
return NULL;
else
return hs_filebuf_from_fd(fd);
}
void
hs_filebuf_close(hs_filebuf_t *fbuf)
{
assert(fbuf->dogtag == filebuf_tag);
close(fbuf->fd);
fbuf->fd = -1;
if (fbuf->fd_cache != -1) {
close(fbuf->fd_cache);
fbuf->fd_cache = -1;
}
bzero(fbuf, sizeof *fbuf);
free(fbuf);
}
/* May return short
*/
ssize_t
hs_filebuf_read(void *private, char *buf, size_t len)
{
struct file_buf *fbuf = (struct file_buf *) private;
ssize_t n;
assert(fbuf->dogtag == filebuf_tag);
assert(fbuf->fd != -1);
#ifdef HS_ALWAYS_READ_SHORT
len = MIN(len, 100);
#endif
n = read(fbuf->fd, buf, len);
if (n < 0) {
_hs_error("error reading fd%d: %s", fbuf->fd, strerror(errno));
}
return n;
}
ssize_t
hs_filebuf_write(void *private, char const *buf, size_t len)
{
struct file_buf *fbuf = (struct file_buf *) private;
size_t n;
assert(fbuf->dogtag == filebuf_tag);
#ifdef HS_ALWAYS_READ_SHORT
len = MIN(len, 100);
#endif
n = write(fbuf->fd, buf, len);
if (fbuf->fd_cache != -1 && n > 0) {
write(fbuf->fd_cache, buf, n);
}
return n;
}
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