From 5fe4d4718cf00876d8de20f4c297dc4ca69db1a4 Mon Sep 17 00:00:00 2001
From: Richard Jones <rjones@redhat.com>
Date: Mon, 18 Jan 2010 17:56:13 +0000
Subject: [PATCH] hivex: Move header checksum code into a function.

This function can be reused later.
---
 hivex/hivex.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/hivex/hivex.c b/hivex/hivex.c
index fd65f8c..9799ddc 100644
--- a/hivex/hivex.c
+++ b/hivex/hivex.c
@@ -255,6 +255,21 @@ struct ntreg_vk_record {
   char name[1];                 /* key name follows here */
 } __attribute__((__packed__));
 
+static uint32_t
+header_checksum (hive_h *h)
+{
+  uint32_t *daddr = (uint32_t *) h->addr;
+  size_t i;
+  uint32_t sum = 0;
+
+  for (i = 0; i < 0x1fc / 4; ++i) {
+    sum ^= le32toh (*daddr);
+    daddr++;
+  }
+
+  return sum;
+}
+
 hive_h *
 hivex_open (const char *filename, int flags)
 {
@@ -323,14 +338,7 @@ hivex_open (const char *filename, int flags)
     goto error;
 
   /* Header checksum. */
-  uint32_t *daddr = (uint32_t *) h->addr;
-  size_t i;
-  uint32_t sum = 0;
-  for (i = 0; i < 0x1fc / 4; ++i) {
-    sum ^= le32toh (*daddr);
-    daddr++;
-  }
-
+  uint32_t sum = header_checksum (h);
   if (sum != le32toh (h->hdr->csum)) {
     fprintf (stderr, "hivex: %s: bad checksum in hive header\n", filename);
     errno = EINVAL;
-- 
1.8.3.1