From ce2a0f5a6aa008e1094f7265b3df77a740dfb78f Mon Sep 17 00:00:00 2001
From: Giovanni Bajo <rasky@develer.com>
Date: Wed, 25 Apr 2012 17:47:56 +0200
Subject: [PATCH] Macros to simplify tentative parsing.

---
 src/dnssec.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/dnssec.c b/src/dnssec.c
index 04b80cc..c9f80ee 100644
--- a/src/dnssec.c
+++ b/src/dnssec.c
@@ -3,6 +3,25 @@
 #include "dnssec-crypto.h"
 #include <assert.h>
 
+#define CHECKED_GETCHAR(var, ptr, len) do { \
+    if ((len) < 1) return 0; \
+    var = *ptr++; \
+    (len) -= 1; \
+  } while (0)
+
+#define CHECKED_GETSHORT(var, ptr, len) do { \
+    if ((len) < 2) return 0; \
+    GETSHORT(var, ptr); \
+    (len) -= 2; \
+  } while (0)
+
+#define CHECKED_GETLONG(var, ptr, len) do { \
+    if ((len) < 4) return 0; \
+    GETLONG(var, ptr); \
+    (len) -= 4; \
+  } while (0)
+
+
 #define SERIAL_UNDEF  -100
 #define SERIAL_EQ        0
 #define SERIAL_LT       -1