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author | root <root@lamia.panaceas.james.local> | 2015-12-19 13:13:57 +0000 |
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committer | root <root@lamia.panaceas.james.local> | 2015-12-19 14:18:03 +0000 |
commit | 1a2238d1bddc823df06f67312d96ccf9de2893cc (patch) | |
tree | c58a3944d674a667f133ea5a730f5037e57d3d2e /cfe/cfe/zlib/adler32.c | |
download | bootloader-1a2238d1bddc823df06f67312d96ccf9de2893cc.tar.gz bootloader-1a2238d1bddc823df06f67312d96ccf9de2893cc.tar.bz2 bootloader-1a2238d1bddc823df06f67312d96ccf9de2893cc.zip |
CFE from danitool [without hostTools dir]: https://mega.nz/#!mwZyFK7a!CPT3BKC8dEw29kubtdYxhB91G9vIIismTkgzQ3iUy3k
Diffstat (limited to 'cfe/cfe/zlib/adler32.c')
-rw-r--r-- | cfe/cfe/zlib/adler32.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/cfe/cfe/zlib/adler32.c b/cfe/cfe/zlib/adler32.c new file mode 100644 index 0000000..70d368e --- /dev/null +++ b/cfe/cfe/zlib/adler32.c @@ -0,0 +1,48 @@ +/* adler32.c -- compute the Adler-32 checksum of a data stream + * Copyright (C) 1995-1998 Mark Adler + * For conditions of distribution and use, see copyright notice in zlib.h + */ + +/* @(#) $Id: adler32.c,v 1.1 2001/11/09 01:48:01 mpl Exp $ */ + +#include "zlib.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,i) {s1 += buf[i]; s2 += s1;} +#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1); +#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2); +#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4); +#define DO16(buf) DO8(buf,0); DO8(buf,8); + +/* ========================================================================= */ +uLong ZEXPORT adler32(adler, buf, len) + uLong adler; + const Bytef *buf; + uInt len; +{ + unsigned long s1 = adler & 0xffff; + unsigned long s2 = (adler >> 16) & 0xffff; + int k; + + if (buf == Z_NULL) return 1L; + + while (len > 0) { + k = len < NMAX ? len : NMAX; + len -= k; + while (k >= 16) { + DO16(buf); + buf += 16; + k -= 16; + } + if (k != 0) do { + s1 += *buf++; + s2 += s1; + } while (--k); + s1 %= BASE; + s2 %= BASE; + } + return (s2 << 16) | s1; +} |