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/***********************************************************************)
(* crc.c *)
(* *)
(* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, *)
(* 2011, 2012, 2013 Yaron Minsky and Contributors *)
(* *)
(* This file is part of SKS. SKS 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 2 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, write to the Free Software *)
(* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *)
(* USA or see <http://www.gnu.org/licenses/>. *)
(***********************************************************************/
#include <stdlib.h>
#include <time.h>
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/custom.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/callback.h>
#define CRC24_INIT 0xb704ceL
#define CRC24_POLY 0x1864cfbL
typedef long crc24;
crc24 crc_octets(unsigned const char *octets, size_t len) {
crc24 crc = CRC24_INIT;
int i;
while (len--) {
crc ^= (*octets++) << 16;
for (i = 0; i < 8; i++) {
crc <<= 1;
if (crc & 0x1000000)
crc ^= CRC24_POLY;
}
}
return crc & 0xffffffL;
}
value caml_crc_octets(value data) {
CAMLparam1(data);
CAMLlocal1(rval);
unsigned const char *octets = String_val(data);
size_t len = string_length(data);
long crc = crc_octets(octets,len);
rval = Val_int(crc);
CAMLreturn(rval);
}
value caml_get_tzname(value none) {
CAMLparam1(none);
CAMLlocal1(rval);
tzset();
rval = alloc_tuple(2);
Store_field(rval,0,copy_string(tzname[0]));
Store_field(rval,1,copy_string(tzname[1]));
CAMLreturn(rval);
}
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