Semiconductor & Computer Engineering
The $decompress identifier performs decompression of a disk file or binary variable.
Synopsis
$decompress( <filename | BinaryVariable> ,[b] )
Parameters
DataFirst parameter can be either a disk file (default) or a Binary Variable
bInforms that first parameter should be treated as a Binary Variable instead of filename.
Example
There are patterns that often appear near the beginning, but there's no guaranteed signature to be found at the beginning of a compressed file, except the 1st character is $chr(120) small-x.
Returns 1 if it decompressed the file, or 0 if it did not. A file can be compressed multiple times, so a decompressed file should either not begin with small-x or return 0 from a decompress attempt. 0 can indicate there's no-such-file, the file wasn't already compressed, or a failure to decompress corrupted data.
; Compresses binary variable then decompresses it. Assumes you have at least 1 color scheme containing white. //bset -t &snip 1 $read($mircini,ntw,*16777215*) | echo 4 -a / $bvar(&snip,1-) | noop $compress(&snip,b) | echo 5 -a \ $bvar(&snip,1-) | noop $decompress(&snip,b) | echo 6 -a $bvar(&snip,1-)
Note: Cannot run as an identifier in a statement by itself, but should be an argument to another command or %variable.
on *:FILERCVD:*.txt:{ bread $qt($filename) 0 1 &snip if ($bvar(&snip,1) == 120) { var %oldsize $file($filename).size var %i $decompress($filename) var %newsize $file($filename).size if (%i) echo -a Successfully decompressed incoming file from size %oldsize to %newsize $+ : $filename else echo -a Unsuccessful attempt to decompress incoming file: $filename } }
Compatibility
Added: mIRC v6.1
Added on: 29 Aug 2003
Note: Unless otherwise stated, this was the date of original functionality.
Further enhancements may have been made in later versions.