From e0cc0d7f5ba24187880706e8e9dc319787160117 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20=C3=96man?= <andreas@lonelycoder.com>
Date: Tue, 22 Jun 2010 08:00:56 +0000
Subject: [PATCH] Add code for computing CRC over a buf

---
 src/htsbuf.c | 20 ++++++++++++++++++++
 src/htsbuf.h |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/src/htsbuf.c b/src/htsbuf.c
index 91a368ac..68cc9850 100644
--- a/src/htsbuf.c
+++ b/src/htsbuf.c
@@ -23,6 +23,7 @@
 #include <string.h>
 #include <stdarg.h>
 #include "htsbuf.h"
+#include "tvhead.h"
 
 #ifndef MIN
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
@@ -118,6 +119,7 @@ htsbuf_append(htsbuf_queue_t *hq, const void *buf, size_t len)
   memcpy(hd->hd_data, buf, len);
 }
 
+
 /**
  *
  */
@@ -275,3 +277,21 @@ htsbuf_appendq(htsbuf_queue_t *hq, htsbuf_queue_t *src)
     TAILQ_INSERT_TAIL(&hq->hq_q, hd, hd_link);
   }
 }
+
+
+/**
+ *
+ */
+uint32_t
+htsbuf_crc32(htsbuf_queue_t *hq, uint32_t crc)
+{
+  htsbuf_data_t *hd;
+  
+  TAILQ_FOREACH(hd, &hq->hq_q, hd_link)
+    crc = crc32(hd->hd_data     + hd->hd_data_off,
+		hd->hd_data_len - hd->hd_data_off,
+		crc);
+  return crc;
+}
+
+
diff --git a/src/htsbuf.h b/src/htsbuf.h
index ed1c0244..856f275b 100644
--- a/src/htsbuf.h
+++ b/src/htsbuf.h
@@ -66,4 +66,6 @@ size_t htsbuf_drop(htsbuf_queue_t *hq, size_t len);
 
 size_t htsbuf_find(htsbuf_queue_t *hq, uint8_t v);
 
+uint32_t htsbuf_crc32(htsbuf_queue_t *q, uint32_t crc);
+
 #endif /* HTSBUF_H__ */