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View File Name : chksum.sl

% Copyright (C) 2012-2014 John E. Davis
%
% This file is part of the S-Lang Library and may be distributed under the
% terms of the GNU General Public License.  See the file COPYING for
% more information.
%---------------------------------------------------------------------------
import ("chksum");

private define chksum_accumulate (c, str)
{
   _chksum_accumulate (c.obj, str);
}

private define chksum_close (c)
{
   variable chksum = _chksum_close (c.obj);
   c.obj = NULL;
   return chksum;
}

define chksum_new (name)
{
   return struct
     {
	obj = _chksum_new (name),
	accumulate = &chksum_accumulate,
	close = &chksum_close,
	name = name,
     };
}

define md5sum_new ()
{
   return chksum_new ("md5");
}

define sha1sum_new ()
{
   return chksum_new ("sha1");
}

define md5sum (str)
{
   variable c = _chksum_new ("md5");
   _chksum_accumulate (c, str);
   return _chksum_close (c);
}

define sha1sum (str)
{
   variable c = _chksum_new ("sha1");
   _chksum_accumulate (c, str);
   return _chksum_close (c);
}

define chksum_file (fp, type)
{
   variable file = NULL;
   if (typeof (fp) != File_Type)
     {
	file = fp;
	fp = fopen (file, "rb");
	if (fp == NULL)
	  throw OpenError, "Error opening $file"$;
     }

   variable c = _chksum_new (type);

   variable buf;
   while (-1 != fread_bytes (&buf, 4096, fp))
     {
	_chksum_accumulate (c, buf);
     }
   % Allow the interpreter to close fp when it goes out of scope
   return _chksum_close (c);
}

define md5sum_file (file)
{
   return chksum_file (file, "md5");
}

define sha1sum_file (file)
{
   return chksum_file (file, "sha1");
}