From 1d94a6620fb8b18ccbba75b7ca74db2fe885e054 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Wed, 19 Jul 2006 08:39:50 +0000
Subject: [PATCH] simplify

Originally committed as revision 5786 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/crc.c   |  2 +-
 libavutil/adler32.c | 11 +++--------
 2 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/libavformat/crc.c b/libavformat/crc.c
index 40eed53e1f..8be5e734e2 100644
--- a/libavformat/crc.c
+++ b/libavformat/crc.c
@@ -29,7 +29,7 @@ static int crc_write_header(struct AVFormatContext *s)
     CRCState *crc = s->priv_data;
 
     /* init CRC */
-    crc->crcval = av_adler32_update(0, NULL, 0);
+    crc->crcval = 1;
 
     return 0;
 }
diff --git a/libavutil/adler32.c b/libavutil/adler32.c
index 1d814b4561..84b432138e 100644
--- a/libavutil/adler32.c
+++ b/libavutil/adler32.c
@@ -11,21 +11,16 @@
 /* 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);
+#define DO4(buf)  DO1(buf); DO1(buf); DO1(buf); DO1(buf);
+#define DO16(buf) DO4(buf); DO4(buf); DO4(buf); DO4(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 = FFMIN(len, NMAX);
+        int k = FFMIN(len, NMAX);
         len -= k;
 #ifndef CONFIG_SMALL
         while (k >= 16) {