This is needed for BTRFS. Signed-off-by: Marek Behun <marek.behun@nic.cz> create mode 100644 lib/crc32c.cmaster
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/*
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* Copied from Linux kernel crypto/crc32c.c |
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* Copyright (c) 2004 Cisco Systems, Inc. |
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* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the Free |
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* Software Foundation; either version 2 of the License, or (at your option) |
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* any later version. |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <compiler.h> |
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uint32_t crc32c_cal(uint32_t crc, const char *data, int length, |
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uint32_t *crc32c_table) |
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{ |
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while (length--) |
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crc = crc32c_table[(u8)(crc ^ *data++)] ^ (crc >> 8); |
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return crc; |
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} |
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void crc32c_init(uint32_t *crc32c_table, uint32_t pol) |
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{ |
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int i, j; |
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uint32_t v; |
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const uint32_t poly = pol; /* Bit-reflected CRC32C polynomial */ |
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for (i = 0; i < 256; i++) { |
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v = i; |
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for (j = 0; j < 8; j++) |
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v = (v >> 1) ^ ((v & 1) ? poly : 0); |
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crc32c_table[i] = v; |
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} |
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} |
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