178 lines
3.8 KiB
C
178 lines
3.8 KiB
C
/*
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$Id: _cdio_stdio.c,v 1.2 2003/03/29 17:32:00 rocky Exp $
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Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
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Copyright (C) 2003 Rocky Bernstein <rocky@panix.com>
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This program 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 2 of the License, or
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(at your option) any later version.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include "logging.h"
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#include "util.h"
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#include "_cdio_stream.h"
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#include "_cdio_stdio.h"
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static const char _rcsid[] = "$Id: _cdio_stdio.c,v 1.2 2003/03/29 17:32:00 rocky Exp $";
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#define CDIO_STDIO_BUFSIZE (128*1024)
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typedef struct {
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char *pathname;
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FILE *fd;
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char *fd_buf;
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off_t st_size; /* used only for source */
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} _UserData;
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static int
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_stdio_open (void *user_data)
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{
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_UserData *const ud = user_data;
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if ((ud->fd = fopen (ud->pathname, "rb")))
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{
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ud->fd_buf = _cdio_malloc (CDIO_STDIO_BUFSIZE);
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setvbuf (ud->fd, ud->fd_buf, _IOFBF, CDIO_STDIO_BUFSIZE);
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}
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return (ud->fd == NULL);
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}
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static int
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_stdio_close(void *user_data)
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{
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_UserData *const ud = user_data;
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if (fclose (ud->fd))
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cdio_error ("fclose (): %s", strerror (errno));
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ud->fd = NULL;
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free (ud->fd_buf);
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ud->fd_buf = NULL;
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return 0;
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}
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static void
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_stdio_free(void *user_data)
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{
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_UserData *const ud = user_data;
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if (ud->pathname)
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free(ud->pathname);
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if (ud->fd) /* should be NULL anyway... */
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_stdio_close(user_data);
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free(ud);
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}
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static long
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_stdio_seek(void *user_data, long offset, int whence)
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{
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_UserData *const ud = user_data;
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if (fseek (ud->fd, offset, whence))
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cdio_error ("fseek (): %s", strerror (errno));
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return offset;
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}
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static long
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_stdio_stat(void *user_data)
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{
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const _UserData *const ud = user_data;
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return ud->st_size;
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}
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static long
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_stdio_read(void *user_data, void *buf, long count)
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{
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_UserData *const ud = user_data;
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long read;
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read = fread(buf, 1, count, ud->fd);
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if (read != count)
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{ /* fixme -- ferror/feof */
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if (feof (ud->fd))
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{
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cdio_debug ("fread (): EOF encountered");
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clearerr (ud->fd);
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}
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else if (ferror (ud->fd))
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{
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cdio_error ("fread (): %s", strerror (errno));
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clearerr (ud->fd);
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}
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else
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cdio_debug ("fread (): short read and no EOF?!?");
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}
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return read;
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}
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CdioDataSource*
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cdio_stdio_new(const char pathname[])
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{
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CdioDataSource *new_obj = NULL;
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cdio_stream_io_functions funcs = { 0, };
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_UserData *ud = NULL;
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struct stat statbuf;
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if (stat (pathname, &statbuf) == -1)
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{
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cdio_error ("could not stat() file `%s': %s", pathname, strerror (errno));
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return NULL;
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}
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ud = _cdio_malloc (sizeof (_UserData));
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ud->pathname = strdup(pathname);
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ud->st_size = statbuf.st_size; /* let's hope it doesn't change... */
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funcs.open = _stdio_open;
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funcs.seek = _stdio_seek;
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funcs.stat = _stdio_stat;
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funcs.read = _stdio_read;
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funcs.close = _stdio_close;
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funcs.free = _stdio_free;
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new_obj = cdio_stream_new(ud, &funcs);
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return new_obj;
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}
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/*
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* Local variables:
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* c-file-style: "gnu"
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*/
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