Initial commit

[com/gs-lite.git] / src / lib / gscplftaaux / rts_options.c

diff --git a/src/lib/gscplftaaux/rts_options.c b/src/lib/gscplftaaux/rts_options.c
new file mode 100644 (file)
index 0000000..44a0ed9
--- /dev/null
+++ b/src/lib/gscplftaaux/rts_options.c
@@ -0,0 +1,58 @@
+#include "md_stdlib.h"
+#include "gsconfig.h"
+#include "gstypes.h"
+#include "rts_external.h"
+
+/* ------------------------------------------------
+Copyright 2014 AT&T Intellectual Property
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+ ------------------------------------------- */
+
+
+gs_retval_t has_ipv4_option( struct gs_string * s, gs_uint32_t ipoption) {
+    gs_int32_t x=0;
+    gs_int32_t on;
+    gs_int32_t len;
+
+    if (s->length==0) return 0; /* no match */
+
+    while(0==0) {
+       if ((on=s->data[x]&0x1f)==ipoption) return 1; /* got a match */
+       switch (on) {
+         case 0:
+           return 0; /* no match and end of list */
+         case 1:
+           x++; /* one byte options */
+           break;
+         case 2: /* 11 byte security option */
+           x+=11;
+           break;
+         case 8:
+           x+=4; /* stream id option */
+           break;
+         case 3:
+         case 9:
+         case 7:
+         case 4:
+           if (x+1>=s->length) return 0; /* run out of data no match */
+           len=s->data[x+1];
+           x+=len;
+           break;
+         default:
+           return 0; /* don't undestand the option */
+       }
+       if (x>=s->length) return 0; /* run out of data no match */
+    }
+               
+    return 0; /* should never be reached */
+}