summaryrefslogtreecommitdiffstats
path: root/compat/zlib/crc32.c
diff options
context:
space:
mode:
Diffstat (limited to 'compat/zlib/crc32.c')
-rw-r--r--compat/zlib/crc32.c35
1 files changed, 27 insertions, 8 deletions
diff --git a/compat/zlib/crc32.c b/compat/zlib/crc32.c
index 667cd15..aba512c 100644
--- a/compat/zlib/crc32.c
+++ b/compat/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 <rbrown64@csc.com.au> for his contribution of faster
@@ -9,7 +9,7 @@
* factor of two increase in speed on a Power PC G4 (PPC7455) using gcc -O3.
*/
-/* @(#) $Id: crc32.c,v 1.1 2008/12/18 14:14:59 dkf Exp $ */
+/* @(#) $Id: crc32.c,v 1.2 2010/03/16 09:01:04 nijtmans Exp $ */
/*
Note on the use of DYNAMIC_CRC_TABLE: there is no mutex or semaphore
@@ -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);
+}