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These files have been created by running ./build-aux/bootstrap with Gnulib as at commit 99ce3a004a2974c71f510f5df5bc6be7e2811d30 (with a date stamp of Tue Jan 2 09:19:44 2024 -0800), Autoconf 2.71, Automake 1.16.5, Gettext 0.21 and pkgconf 1.8.1.
48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
/* crc.h -- cyclic redundancy checks
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Copyright (C) 2005, 2009-2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Simon Josefsson. */
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#ifndef CRC_H
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# define CRC_H 1
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#include <stddef.h>
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#include <stdint.h>
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/* Compute CRC-32 value of LEN bytes long BUF, and return it. */
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extern uint32_t crc32 (const char *buf, size_t len);
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/* Incrementally update CRC-32 value CRC using LEN bytes long BUF. In
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the first call, use 0 as the value for CRC. Return the updated
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CRC-32 value. */
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extern uint32_t crc32_update (uint32_t crc, const char *buf, size_t len);
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/* Compute modified-CRC-32 value of LEN bytes long BUF, and return it.
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The "modification" is to avoid the initial and final XOR operation.
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Due to historic implementation errors, this variant is sometimes
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used (i.e., in RFC 3961). */
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extern uint32_t crc32_no_xor (const char *buf, size_t len);
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/* Incrementally update modified-CRC-32 value CRC using LEN bytes long
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BUF. In the first call, use 0 as the value for CRC. Return the
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updated modified-CRC-32 value. The "modification" is to avoid the
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initial and final XOR operation. Due to historic implementation
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errors, this variant is sometimes used (i.e., in RFC 3961). */
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extern uint32_t
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crc32_update_no_xor (uint32_t crc, const char *buf, size_t len);
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#endif /* CRC_H */
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