>From d19d554663a20b40a06e7b126f8110490280ae2b Mon Sep 17 00:00:00 2001 From: Richard Jones Date: Mon, 18 Jan 2010 17:56:13 +0000 Subject: [PATCH 05/13] hivex: Move header checksum code into a function. This function can be reused later. --- hivex/hivex.c | 24 ++++++++++++++++-------- 1 files changed, 16 insertions(+), 8 deletions(-) diff --git a/hivex/hivex.c b/hivex/hivex.c index cb6c772..cb6fc62 100644 --- a/hivex/hivex.c +++ b/hivex/hivex.c @@ -262,6 +262,21 @@ 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) { @@ -340,14 +355,7 @@ 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; -- 1.6.5.2