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-rw-r--r--src/spdk/lib/util/crc32.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/src/spdk/lib/util/crc32.c b/src/spdk/lib/util/crc32.c
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+++ b/src/spdk/lib/util/crc32.c
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+/*-
+ * BSD LICENSE
+ *
+ * Copyright (c) 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 "spdk/crc32.h"
+
+void
+spdk_crc32_table_init(struct spdk_crc32_table *table, uint32_t polynomial_reflect)
+{
+ int i, j;
+ uint32_t val;
+
+ for (i = 0; i < 256; i++) {
+ val = i;
+ for (j = 0; j < 8; j++) {
+ if (val & 1) {
+ val = (val >> 1) ^ polynomial_reflect;
+ } else {
+ val = (val >> 1);
+ }
+ }
+ table->table[i] = val;
+ }
+}
+
+uint32_t
+spdk_crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc)
+{
+ const uint8_t *buf_u8 = buf;
+ size_t i;
+
+ for (i = 0; i < len; i++) {
+ crc = (crc >> 8) ^ table->table[(crc ^ buf_u8[i]) & 0xff];
+ }
+
+ return crc;
+}