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-rw-r--r--src/isa-l/igzip/adler32_base.c63
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diff --git a/src/isa-l/igzip/adler32_base.c b/src/isa-l/igzip/adler32_base.c
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+++ b/src/isa-l/igzip/adler32_base.c
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+/**********************************************************************
+ Copyright(c) 2011-2017 Intel Corporation All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of Intel Corporation nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**********************************************************************/
+
+#include <stdint.h>
+#include "igzip_checksums.h"
+
+uint32_t adler32_base(uint32_t adler32, uint8_t * start, uint32_t length)
+{
+ uint8_t *end, *next = start;
+ uint64_t A, B;
+
+ A = adler32 & 0xffff;
+ B = adler32 >> 16;
+
+ while (length > MAX_ADLER_BUF) {
+ end = next + MAX_ADLER_BUF;
+ for (; next < end; next++) {
+ A += *next;
+ B += A;
+ }
+
+ A = A % ADLER_MOD;
+ B = B % ADLER_MOD;
+ length -= MAX_ADLER_BUF;
+ }
+
+ end = next + length;
+ for (; next < end; next++) {
+ A += *next;
+ B += A;
+ }
+
+ A = A % ADLER_MOD;
+ B = B % ADLER_MOD;
+
+ return B << 16 | A;
+}