-
-
//replacement encrypted replacement from the previous version - function compress_func($match) {return strlen($match[0]).$match[0]{0 };}
- function uncompress_func($match) {return str_repeat($match[2], $match[1]);}
- function compress($str) {
- $i = 0;
- $pattern = array();
- while(isset($replacement{$i})) array_push($pattern, "/".$replacement{$i++}."{2,}/");
- return preg_replace_callback($pattern, "compress_func", $ str);
- }
function uncompress($str) { - return preg_replace_callback("/(d+)(w)/", "uncompress_func", $str);
- }
- ?> ;
-
Now I will share the code for awk to implement string compression.
AWK, universal format compressed string:
-
- #!/bin/awk
- function compress(str, _ARGVEND_, str_out, str_len, i, s, l) {
- str_out = "";
- str_len = length(str);
- s = "" ;
- l = 1;
- for(i =1; i <= str_len; i++) {
- if(substr(str, i, 1) == s) l++;
- else {
- if(s != "" ) {
- if(l > 1) str_out=str_out""l
- str_out=str_out""s;
- }
- s = substr(str, i, 1);
- l = 1;
- }
- }
- return str_out ;
- }
- function uncompress(str, _ARGVEND_, str_out, str_len, i, c) {
- str_out = "";
- str_len = length(str);
- for(i =1; i <= str_len; i++) {
- c = 0;
- while(substr(str, i, 1)~/[0-9]/) {
- c = c*10+substr(str, i, 1);
- i++;
- }
- if( c < 1) c = 1;
- while(c--) str_out = str_out""substr(str, i, 1);
- }
- return str_out;
- }
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