1 files changed, 91 insertions, 0 deletions
diff --git a/xdapply.c b/xdapply.c
new file mode 100755
index 0000000..cc492d2
--- /dev/null
+++ b/xdapply.c
@@ -0,0 +1,91 @@
+/* -*- Mode: C;-*-
+ *
+ * This file is part of XDelta - A binary delta generator.
+ *
+ * Copyright (C) 1997, 1998, 1999  Josh MacDonald
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Author: Josh MacDonald <jmacd@CS.Berkeley.EDU>
+ *
+ * $Id: xdapply.c 1.1 Thu, 01 Apr 1999 23:29:11 -0800 jmacd $
+ */
+
+#include <string.h>
+#include <stdlib.h>
+
+#include "xdelta.h"
+#include "xdeltapriv.h"
+
+/* This code used to be more general, but implemented a very
+ * inefficient algorithm.  It is sufficient (and efficient) for the
+ * special case below, though, so I'm leaving it. */
+static gboolean
+xdp_copy_delta_region    (XdeltaControl     *cont,
+			  XdeltaOutStream   *output_stream)
+{
+  gint i, l = cont->inst_len;
+  guint save_written = 0;
+
+  for (i = 0; i < l; i += 1)
+    {
+      const XdeltaInstruction *inst = cont->inst + i;
+      XdeltaSourceInfo* info;
+
+      if (inst->index >= cont->source_info_len)
+	{
+	  xd_generate_int_event (EC_XdOutOfRangeSourceIndex, inst->index);
+	  return FALSE;
+	}
+
+      info = cont->source_info[inst->index];
+
+      if (! handle_copy (info->in, output_stream, inst->offset, inst->length))
+	return FALSE;
+
+      save_written += inst->length;
+    }
+
+  return TRUE;
+}
+
+gboolean
+xdp_apply_delta (XdeltaControl     *cont,
+		 XdeltaOutStream   *res)
+{
+  if (! xdp_copy_delta_region (cont, res))
+    return FALSE;
+
+  if (! handle_close (res, 0))
+    return FALSE;
+
+  if (! check_stream_integrity (res, cont->to_md5, cont->to_len))
+    {
+      int i;
+
+      /* to better report errors, check if the inputs were invalid now
+       */
+      for (i = 0; i < cont->source_info_len; i += 1)
+	{
+	  check_stream_integrity (cont->source_info[i]->in,
+				  cont->source_info[i]->md5,
+				  cont->source_info[i]->len);
+	}
+
+      return FALSE;
+    }
+
+  return TRUE;
+}