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Diffstat (limited to 'gnulib/lib/crc.h')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/lib/crc.h | 47 |
2 files changed, 47 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/lib/crc.h b/gnulib/lib/crc.h new file mode 100644 index 0000000..e774252 --- /dev/null +++ b/gnulib/lib/crc.h @@ -0,0 +1,47 @@ +/* crc.h -- cyclic redundancy checks + Copyright (C) 2005, 2009-2011 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +/* Written by Simon Josefsson. */ + +#ifndef CRC_H +# define CRC_H 1 + +#include <stddef.h> +#include <stdint.h> + +/* Compute CRC-32 value of LEN bytes long BUF, and return it. */ +extern uint32_t crc32 (const char *buf, size_t len); + +/* Incrementally update CRC-32 value CRC using LEN bytes long BUF. In + the first call, use 0 as the value for CRC. Return the updated + CRC-32 value. */ +extern uint32_t crc32_update (uint32_t crc, const char *buf, size_t len); + +/* Compute modified-CRC-32 value of LEN bytes long BUF, and return it. + The "modification" is to avoid the initial and final XOR operation. + Due to historic implementation errors, this variant is sometimes + used (i.e., in RFC 3961). */ +extern uint32_t crc32_no_xor (const char *buf, size_t len); + +/* Incrementally update modified-CRC-32 value CRC using LEN bytes long + BUF. In the first call, use 0 as the value for CRC. Return the + updated modified-CRC-32 value. The "modification" is to avoid the + initial and final XOR operation. Due to historic implementation + errors, this variant is sometimes used (i.e., in RFC 3961). */ +extern uint32_t +crc32_update_no_xor (uint32_t crc, const char *buf, size_t len); + +#endif /* CRC_H */ |