From b9a73d8d2f1930bf705c836a09f0514480799898 Mon Sep 17 00:00:00 2001
From: Måns Rullgård <mans@mansr.com>
Date: Thu, 13 Jul 2006 21:29:01 +0000
Subject: move adler32 to libavutil

Originally committed as revision 5731 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavutil/adler32.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 libavutil/adler32.c

(limited to 'libavutil/adler32.c')

diff --git a/libavutil/adler32.c b/libavutil/adler32.c
new file mode 100644
index 0000000000..ab0b86da74
--- /dev/null
+++ b/libavutil/adler32.c
@@ -0,0 +1,41 @@
+/* adler32.c -- compute the Adler-32 checksum of a data stream
+ * Copyright (C) 1995 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#include "common.h"
+#include "adler32.h"
+
+#define BASE 65521L /* largest prime smaller than 65536 */
+#define NMAX 5552
+/* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
+
+#define DO1(buf)  {s1 += *buf++; s2 += s1;}
+#define DO2(buf)  DO1(buf); DO1(buf);
+#define DO4(buf)  DO2(buf); DO2(buf);
+#define DO8(buf)  DO4(buf); DO4(buf);
+#define DO16(buf) DO8(buf); DO8(buf);
+
+unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf, unsigned int len)
+{
+    unsigned long s1 = adler & 0xffff;
+    unsigned long s2 = (adler >> 16) & 0xffff;
+    int k;
+
+    if (buf == NULL) return 1L;
+
+    while (len > 0) {
+        k = len < NMAX ? len : NMAX;
+        len -= k;
+        while (k >= 16) {
+            DO16(buf);
+            k -= 16;
+        }
+        if (k != 0) do {
+            DO1(buf);
+        } while (--k);
+        s1 %= BASE;
+        s2 %= BASE;
+    }
+    return (s2 << 16) | s1;
+}
-- 
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