From: Martin Mares <mj@ucw.cz>
Date: Sun, 18 Mar 2012 22:08:01 +0000 (+0100)
Subject: CRC: Added crc32_hash_buffer()
X-Git-Tag: v5.99~184
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=f22fe2e1dde82925771f4ef565ba8c09cfc458c0;p=libucw.git

CRC: Added crc32_hash_buffer()
---

diff --git a/ucw/crc.c b/ucw/crc.c
index 2c03ccdb..73fd2e69 100644
--- a/ucw/crc.c
+++ b/ucw/crc.c
@@ -134,6 +134,15 @@ crc32_init(crc32_context *ctx, uns crc_mode)
     }
 }
 
+u32
+crc32_hash_buffer(const byte *buf, uns len)
+{
+  crc32_context ctx;
+  crc32_init(&ctx, CRC_MODE_DEFAULT);
+  crc32_update(&ctx, buf, len);
+  return crc32_final(&ctx);
+}
+
 #ifdef TEST
 
 #include <stdio.h>
diff --git a/ucw/crc.h b/ucw/crc.h
index 28d59acf..a5134267 100644
--- a/ucw/crc.h
+++ b/ucw/crc.h
@@ -54,3 +54,14 @@ static inline u32 crc32_final(crc32_context *ctx)
 {
   return ctx->state ^ 0xffffffff;
 }
+
+/**
+ * A convenience one-shot function for CRC.
+ * It is equivalent to this snippet of code:
+ *
+ *  crc32_context ctx;
+ *  crc32_init(&ctx, CRC_MODE_DEFAULT);
+ *  crc32_update(&ctx, buf, len);
+ *  return crc32_final(&ctx);
+ */
+u32 crc32_hash_buffer(const byte *buf, uns len);