Initial revision

lib/_cdio_stdio.c

@@ -0,0 +1,177 @@
+/*
+    $Id: _cdio_stdio.c,v 1.1 2003/03/24 19:01:09 rocky Exp $
+
+    Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.org>
+    Copyright (C) 2003 Rocky Bernstein <rocky@panix.com>
+
+    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
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h> 
+#include <sys/stat.h>
+#include <errno.h>
+
+#include "logging.h"
+#include "util.h"
+#include "_cdio_stream.h"
+#include "_cdio_stdio.h"
+
+static const char _rcsid[] = "$Id: _cdio_stdio.c,v 1.1 2003/03/24 19:01:09 rocky Exp $";
+
+#define CDIO_STDIO_BUFSIZE (128*1024)
+
+typedef struct {
+  char *pathname;
+  FILE *fd;
+  char *fd_buf;
+  off_t st_size; /* used only for source */
+} _UserData;
+
+static int
+_stdio_open (void *user_data) 
+{
+  _UserData *const ud = user_data;
+  
+  if ((ud->fd = fopen (ud->pathname, "rb")))
+    {
+      ud->fd_buf = _cdio_malloc (CDIO_STDIO_BUFSIZE);
+      setvbuf (ud->fd, ud->fd_buf, _IOFBF, CDIO_STDIO_BUFSIZE);
+    }
+
+  return (ud->fd == NULL);
+}
+
+static int
+_stdio_close(void *user_data)
+{
+  _UserData *const ud = user_data;
+
+  if (fclose (ud->fd))
+    cdio_error ("fclose (): %s", strerror (errno));
+ 
+  ud->fd = NULL;
+
+  free (ud->fd_buf);
+  ud->fd_buf = NULL;
+
+  return 0;
+}
+
+static void
+_stdio_free(void *user_data)
+{
+  _UserData *const ud = user_data;
+
+  if (ud->pathname)
+    free(ud->pathname);
+
+  if (ud->fd) /* should be NULL anyway... */
+    _stdio_close(user_data); 
+
+  free(ud);
+}
+
+static long
+_stdio_seek(void *user_data, long offset)
+{
+  _UserData *const ud = user_data;
+
+  if (fseek (ud->fd, offset, SEEK_SET))
+    cdio_error ("fseek (): %s", strerror (errno));
+
+  return offset;
+}
+
+static long
+_stdio_stat(void *user_data)
+{
+  const _UserData *const ud = user_data;
+
+  return ud->st_size;
+}
+
+static long
+_stdio_read(void *user_data, void *buf, long count)
+{
+  _UserData *const ud = user_data;
+  long read;
+
+  read = fread(buf, 1, count, ud->fd);
+
+  if (read != count)
+    { /* fixme -- ferror/feof */
+      if (feof (ud->fd))
+        {
+          cdio_debug ("fread (): EOF encountered");
+          clearerr (ud->fd);
+        }
+      else if (ferror (ud->fd))
+        {
+          cdio_error ("fread (): %s", strerror (errno));
+          clearerr (ud->fd);
+        }
+      else
+        cdio_debug ("fread (): short read and no EOF?!?");
+    }
+
+  return read;
+}
+
+CdioDataSource*
+cdio_stdio_new(const char pathname[])
+{
+  CdioDataSource *new_obj = NULL;
+  cdio_stream_io_functions funcs = { 0, };
+  _UserData *ud = NULL;
+  struct stat statbuf;
+  
+  if (stat (pathname, &statbuf) == -1) 
+    {
+      cdio_error ("could not stat() file `%s': %s", pathname, strerror (errno));
+      return NULL;
+    }
+
+  ud = _cdio_malloc (sizeof (_UserData));
+
+  ud->pathname = strdup(pathname);
+  ud->st_size  = statbuf.st_size; /* let's hope it doesn't change... */
+
+  funcs.open   = _stdio_open;
+  funcs.seek   = _stdio_seek;
+  funcs.stat   = _stdio_stat;
+  funcs.read   = _stdio_read;
+  funcs.close  = _stdio_close;
+  funcs.free   = _stdio_free;
+
+  new_obj = cdio_stream_new(ud, &funcs);
+
+  return new_obj;
+}
+
+
+/* 
+ * Local variables:
+ *  c-file-style: "gnu"
+ *  tab-width: 8
+ *  indent-tabs-mode: nil
+ * End:
+ */