From 673df40c01d3b2292e5998a5b9de1ff71dca5740 Mon Sep 17 00:00:00 2001 From: Ralf Corsepius Date: Fri, 18 Mar 2011 10:11:03 +0000 Subject: Import from zlib-1.2.4 --- cpukit/zlib/crc32.c | 33 ++++++++++++++++++++++++++------- 1 file changed, 26 insertions(+), 7 deletions(-) (limited to 'cpukit') diff --git a/cpukit/zlib/crc32.c b/cpukit/zlib/crc32.c index f658a9ef55..1acc7ed8e4 100644 --- a/cpukit/zlib/crc32.c +++ b/cpukit/zlib/crc32.c @@ -1,5 +1,5 @@ /* crc32.c -- compute the CRC-32 of a data stream - * Copyright (C) 1995-2005 Mark Adler + * Copyright (C) 1995-2006 Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h * * Thanks to Rodney Brown for his contribution of faster @@ -53,7 +53,7 @@ /* Definitions for doing the crc four data bytes at a time. */ #ifdef BYFOUR -# define REV(w) (((w)>>24)+(((w)>>8)&0xff00)+ \ +# define REV(w) ((((w)>>24)&0xff)+(((w)>>8)&0xff00)+ \ (((w)&0xff00)<<8)+(((w)&0xff)<<24)) local unsigned long crc32_little OF((unsigned long, const unsigned char FAR *, unsigned)); @@ -68,6 +68,8 @@ local unsigned long gf2_matrix_times OF((unsigned long *mat, unsigned long vec)); local void gf2_matrix_square OF((unsigned long *square, unsigned long *mat)); +local uLong crc32_combine_(uLong crc1, uLong crc2, z_off64_t len2); + #ifdef DYNAMIC_CRC_TABLE @@ -367,22 +369,22 @@ local void gf2_matrix_square(square, mat) } /* ========================================================================= */ -uLong ZEXPORT crc32_combine(crc1, crc2, len2) +local uLong crc32_combine_(crc1, crc2, len2) uLong crc1; uLong crc2; - z_off_t len2; + z_off64_t len2; { int n; unsigned long row; unsigned long even[GF2_DIM]; /* even-power-of-two zeros operator */ unsigned long odd[GF2_DIM]; /* odd-power-of-two zeros operator */ - /* degenerate case */ - if (len2 == 0) + /* degenerate case (also disallow negative lengths) */ + if (len2 <= 0) return crc1; /* put operator for one zero bit in odd */ - odd[0] = 0xedb88320L; /* CRC-32 polynomial */ + odd[0] = 0xedb88320UL; /* CRC-32 polynomial */ row = 1; for (n = 1; n < GF2_DIM; n++) { odd[n] = row; @@ -421,3 +423,20 @@ uLong ZEXPORT crc32_combine(crc1, crc2, len2) crc1 ^= crc2; return crc1; } + +/* ========================================================================= */ +uLong ZEXPORT crc32_combine(crc1, crc2, len2) + uLong crc1; + uLong crc2; + z_off_t len2; +{ + return crc32_combine_(crc1, crc2, len2); +} + +uLong ZEXPORT crc32_combine64(crc1, crc2, len2) + uLong crc1; + uLong crc2; + z_off64_t len2; +{ + return crc32_combine_(crc1, crc2, len2); +} -- cgit v1.2.3