Numerical Service Extension
|
Ver. 1.02
Contributed by Lijun
Yang |
What
n_cst_numerical
Why
- Add functions for data conversion among binary, hexadecimal and decimal
- Change decimal data type from long to ulong in order to correct errors in
data conversion and bitwise operations
- Rewrite bitwise operations in order to increase performance as well as to
correct errors in data conversion and bitwise operations. As a result, the extended
bitwise operations are 7 times faster than the original pfc’s. It is quite efficient
to use this n_cst_numerical for encryption and decryption.
How
- Add of_hex (as_binary), of_hex (aul_decimal), of_binary (as_hex), and
of_decimal(as_data, ai_datatype)
- For individual bits, use PB script equivalents in place of bitwise
operations as follows:
| Bitwise Operation |
PB script |
| a && b |
a*b |
| a || b |
int ((a+b+1)/2) |
| a XOR b |
mod(a+b, 2) |
| !a |
1-a |
Usage :
- For binary to decimal conversion, call of_decimal (as_data, 0)
- for binary to hexadecimal conversion, call of_hex (as_binary)
- For hexadecimal to decimal conversion, call of_decimal (as_data, 1)
- For hexadecimal to binary conversion, call of_binary(as_hex)
- For decimal to hexadecimal conversion, call of_hex (aul_decimal)
| Revision
History |
| 08/19/1997 |
Initial Revision |
Ver. 1.00 |
| 10/13/1997 |
Changed the A XOR B bitwise operation from
abs(a-b) to mod(a+b, 2) |
Ver. 1.01 |
| 03/14/1998 |
Corrected an error in binary-hexadecimal
conversion |
Ver. 1.02 |
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Last Revised: February 15, 2004 03:58 AM.