1 files changed, 198 insertions, 0 deletions
diff --git a/src/input/vcd/libcdio/_cdio_stream.c b/src/input/vcd/libcdio/_cdio_stream.c
new file mode 100644
index 000000000..ee2f2b086
--- /dev/null
+++ b/src/input/vcd/libcdio/_cdio_stream.c
@@ -0,0 +1,198 @@
+/*
+    $Id: _cdio_stream.c,v 1.1 2003/10/13 11:47:11 f1rmb Exp $
+
+    Copyright (C) 2000 Herbert Valerio Riedel <hvr@gnu.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
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include "cdio_assert.h"
+
+/* #define STREAM_DEBUG  */
+
+#include <cdio/logging.h>
+#include <cdio/util.h>
+#include "_cdio_stream.h"
+
+static const char _rcsid[] = "$Id: _cdio_stream.c,v 1.1 2003/10/13 11:47:11 f1rmb Exp $";
+
+/* 
+ * DataSource implementations
+ */
+
+struct _CdioDataSource {
+  void* user_data;
+  cdio_stream_io_functions op;
+  int is_open;
+  long position;
+};
+
+/* 
+   Open if not already open. 
+   Return false if we hit an error. Errno should be set for that error.
+*/
+static bool
+_cdio_stream_open_if_necessary(CdioDataSource *obj)
+{
+  cdio_assert (obj != NULL);
+
+  if (!obj->is_open) {
+    if (obj->op.open(obj->user_data)) {
+      cdio_warn ("could not open input stream...");
+      return false;
+    } else {
+      cdio_debug ("opened source...");
+      obj->is_open = 1;
+      obj->position = 0;
+    }
+  }
+  return true;
+}
+
+/*! 
+  Like 3 fseek and in fact may be the same.
+  
+  This  function sets the file position indicator for the stream
+  pointed to by stream.  The new position, measured in bytes, is obtained
+  by  adding offset bytes to the position specified by whence.  If whence
+  is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset  is  relative  to
+  the  start of the file, the current position indicator, or end-of-file,
+  respectively.  A successful call to the fseek function clears the end-
+  of-file indicator for the stream and undoes any effects of the
+  ungetc(3) function on the same stream.
+  
+  RETURN VALUE
+  Upon successful completion, return 0,
+  Otherwise, -1 is returned and the global variable errno is set to indi-
+  cate the error.
+*/
+long
+cdio_stream_seek(CdioDataSource* obj, long offset, int whence)
+{
+  cdio_assert (obj != NULL);
+
+  if (!_cdio_stream_open_if_necessary(obj)) 
+    /* errno is set by _cdio_stream_open_if necessary. */
+    return -1;
+
+  if (obj->position != offset) {
+#ifdef STREAM_DEBUG
+    cdio_warn("had to reposition DataSource from %ld to %ld!", obj->position, offset);
+#endif
+    obj->position = offset;
+    return obj->op.seek(obj->user_data, offset, whence);
+  }
+
+  return 0;
+}
+
+CdioDataSource*
+cdio_stream_new(void *user_data, const cdio_stream_io_functions *funcs)
+{
+  CdioDataSource *new_obj;
+
+  new_obj = _cdio_malloc (sizeof (CdioDataSource));
+
+  new_obj->user_data = user_data;
+  memcpy(&(new_obj->op), funcs, sizeof(cdio_stream_io_functions));
+
+  return new_obj;
+}
+
+/*!
+  Like fread(3) and in fact may be the same.
+  
+  DESCRIPTION:
+  The function fread reads nmemb elements of data, each size bytes long,
+  from the stream pointed to by stream, storing them at the location
+  given by ptr.
+  
+  RETURN VALUE:
+  return the number of items successfully read or written (i.e.,
+  not the number of characters).  If an error occurs, or the
+  end-of-file is reached, the return value is a short item count
+  (or zero).
+  
+  We do not distinguish between end-of-file and error, and callers
+  must use feof(3) and ferror(3) to determine which occurred.
+*/
+long
+cdio_stream_read(CdioDataSource* obj, void *ptr, long size, long nmemb)
+{
+  long read_bytes;
+
+  cdio_assert (obj != NULL);
+
+  if (!_cdio_stream_open_if_necessary(obj)) return 0;
+
+  read_bytes = obj->op.read(obj->user_data, ptr, size*nmemb);
+  obj->position += read_bytes;
+
+  return read_bytes;
+}
+
+/*!
+  Return whatever size of stream reports, I guess unit size is bytes. 
+  On error return -1;
+ */
+long int
+cdio_stream_stat(CdioDataSource* obj)
+{
+  cdio_assert (obj != NULL);
+
+  if (!_cdio_stream_open_if_necessary(obj)) return -1;
+
+  return obj->op.stat(obj->user_data);
+}
+
+void
+cdio_stream_close(CdioDataSource* obj)
+{
+  cdio_assert (obj != NULL);
+
+  if (obj->is_open) {
+    cdio_debug ("closed source...");
+    obj->op.close(obj->user_data);
+    obj->is_open = 0;
+    obj->position = 0;
+  }
+}
+
+void
+cdio_stream_destroy(CdioDataSource* obj)
+{
+  cdio_assert (obj != NULL);
+
+  cdio_stream_close(obj);
+
+  obj->op.free(obj->user_data);
+}
+
+
+/* 
+ * Local variables:
+ *  c-file-style: "gnu"
+ *  tab-width: 8
+ *  indent-tabs-mode: nil
+ * End:
+ */