Semiconductor & Computer Engineering
The /breplace command can be used to replace an ASCII value by another value in a binary variable. Multiple replacements are allowed.
Synopsis[edit]
/breplace &binvar <oldvalue> <newvalue> [oldvalue newvalue...] /breplace &binvar <old-char/value> <old-char/value> [old-char/value new-char/value...]
Switches[edit]
None
Parameters[edit]
- <oldvalue> - The old ASCII value to replaced (decimal 0-255)
- <newvalue> - The new ASCII value to replace the old one (decimal 0-255)
- Note: - Also accepts case-sensitive text characters/strings as parameters, using $asc(1st character of the string)
Note: This replaces individual bytes and does not allow replacing multi-byte patterns with new multi-byte patterns.
Note: Bytes are replaced only once, even if the new_value is the old_value for the next old/new pair. This means that it mimics the behavior of $replacex not $replace. However the replacements are made in reverse order, with the first pair being replaced last of all.
Note: You can have multiple old/new number pairs, and if the count of numbers is an odd number greater than 2, the last unpaired number is ignored.
Note: You cannot breplace within a portion of a binary &string unless you bcopy that section to a &temp where you perform the breplace then bcopy &temp back to the original &string/position.
Example[edit]
Alias Example { ;Create a binary variable set it to "Hello World" bset -t &Example 1 Hello World ;Replace e (ASCII value 101) with 3 (ASCII value 51) breplace &Example 101 51 ;Echo our new string echo -a $bvar(&Example,1,$bvar(&Example,0)).text }
The above example will output:
H3llo World
Note that long strings can be replaced. The replace is on the entire token - not finding the 0 within the 10: //bset &a 7654321 10 | echo -a $bvar(&a,7654300-) | breplace &a 0 1 | echo -a $bvar(&a,7654300-) shows the last 22 bytes changing: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 10
The replacements are made in the same style as $replacexcs not $replace, but the replacement pairs are made in reverse order. Because of the reverse order, /breplace swaps the 11 for the 77 in the last pair before it can replace the 11 with the 88. //var %a 11 22 33 44 | bset &v 1 %a | breplace &v 11 88 44 66 11 77 | echo -a %a (original) | echo -a $bvar(&v,1-) (breplace) | echo -a $replace(%a,11,88,44,66,11,77,66,99) (replace) | echo -a $replacex(%a,11,88,44,66,11,77,66,99) (replacex) result: 11 22 33 44 (original) 77 22 33 66 (breplace) 88 22 33 99 (replace) 88 22 33 66 (replacex)
The first character of a string can substitute in place of a byte value, if it is non-numeric and is not UTF-8 encoded to more than 1 byte. In this example, the chr(233) is not replaced because there is no 1-byte character match. The next match fails because capital F is not a case-sensitive match for lower-case 'f'. The 'b' takes the place of byte value 98, and is replaced by $chr(33). The first character of 'abc' is found in the string, and is replaced by the 1st character of 'xyz'. //bset -t &v 1 abcdefé | breplace &v abc xyz b 33 F g $chr(233) $chr(234) | echo -a $bvar(&v,1-) / $bvar(&v,1-).text result: x!cdefé
The number of from/to byte pairs is an odd number greater than 2, so the last unpaired number is ignored without reporting an error, before the swaps are made in reverse-pair order: //bset &a 1 13 10 13 10 99 | breplace &a 10 13 13 10 99 | echo -a $bvar(&a,1-) returns: 10 13 10 13 99
Compatibility[edit]
Added: mIRC v5.6
Added on: 03 Jun 1999
Note: Unless otherwise stated, this was the date of original functionality.
Further enhancements may have been made in later versions.