1 files changed, 63 insertions, 0 deletions
diff --git a/src/isa-l/igzip/adler32_base.c b/src/isa-l/igzip/adler32_base.c
new file mode 100644
index 000000000..034b71a41
--- /dev/null
+++ b/src/isa-l/igzip/adler32_base.c
@@ -0,0 +1,63 @@
+/**********************************************************************
+  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;
+}