make-logtab

来自「支持SSL v2/v3, TLS, PKCS #5, PKCS #7, PKCS」· 代码 · 共 61 行

#!/usr/linguist/bin/perl

#
# make-logtab
#
# Generate a table of logarithms of 2 in various bases, for use in
# estimating the output sizes of various bases.
#
## The contents of this file are subject to the Mozilla Public
## License Version 1.1 (the "License"); you may not use this file
## except in compliance with the License. You may obtain a copy of
## the License at http://www.mozilla.org/MPL/
##
## Software distributed under the License is distributed on an "AS
## IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
## implied. See the License for the specific language governing
## rights and limitations under the License.
##
## The Original Code is the MPI Arbitrary Precision Integer Arithmetic
## library.
##
## The Initial Developer of the Original Code is 
## Michael J. Fromberger <[e-mail]>
##
## Portions created by Michael J. Fromberger are 
## Copyright (C) 1998, 2000 Michael J. Fromberger. All Rights Reserved
##
## Contributor(s):
##
## Alternatively, the contents of this file may be used under the
## terms of the GNU General Public License Version 2 or later (the
## "GPL"), in which case the provisions of the GPL are applicable
## instead of those above.  If you wish to allow use of your
## version of this file only under the terms of the GPL and not to
## allow others to use your version of this file under the MPL,
## indicate your decision by deleting the provisions above and
## replace them with the notice and other provisions required by
## the GPL.  If you do not delete the provisions above, a recipient
## may use your version of this file under either the MPL or the
## GPL.
#
# $Id: make-logtab,v 1.3 2000/08/09 22:45:51 nelsonb%netscape.com Exp $

$ARRAYNAME = $ENV{'ARRAYNAME'} || "s_logv_2";
$ARRAYTYPE = $ENV{'ARRAYTYPE'} || "float";

printf("const %s %s[] = {\n   %0.9ff, %0.9ff, ", 
       $ARRAYTYPE, $ARRAYNAME, 0, 0);
$brk = 2;
for($ix = 2; $ix < 64; $ix++) {
    printf("%0.9ff, ", (log(2)/log($ix)));
    $brk = ($brk + 1) & 3;
    if(!$brk) {
	printf(" /* %2d %2d %2d %2d */\n   ",
	       $ix - 3, $ix - 2, $ix - 1, $ix);
    }
}
printf("%0.9ff\n};\n\n", (log(2)/log($ix)));

exit 0;