쉘스크립트/유용한함수2009/11/23 06:50

urldecode functions

One-liner urldecode functions

awk

#!/bin/sh
# (C) 2006 GPL by Huidae Cho
awk '
BEGIN{
	for(i = 0; i < 10; i++)
		hex[i] = i
	hex["A"] = hex["a"] = 10
	hex["B"] = hex["b"] = 11
	hex["C"] = hex["c"] = 12
	hex["D"] = hex["d"] = 13
	hex["E"] = hex["e"] = 14
	hex["F"] = hex["f"] = 15
}
{
	gsub(/\+/, " ")
	i = $0
	while(match(i, /%../)){
		if(RSTART > 1)
			printf "%s", substr(i, 1, RSTART-1)
		printf "%c", hex[substr(i, RSTART+1, 1)] * 16 + hex[substr(i, RSTART+2, 1)]
		i = substr(i, RSTART+RLENGTH)
	}
	print i
}
'

OK, OK, I said "One-liner" urldecode functions. Try this! :-)

$ alias urldecode="awk '"'BEGIN{for(i=0;i<10;i++)hex[i]=i;hex["A"]=hex["a"]=10;hex["B"]=hex["b"]=11;hex["C"]=hex["c"]=12;hex["D"]=hex["d"]=13;hex["E"]=hex["e"]=14;hex["F"]=hex["f"]=15;}{gsub(/\+/," ");i=$0;while(match(i,/%../)){;if(RSTART>1);printf"%s",substr(i,1,RSTART-1);printf"%c",hex[substr(i,RSTART+1,1)]*16+hex[substr(i,RSTART+2,1)];i=substr(i,RSTART+RLENGTH);}print i;}'"'"

$ echo "%31+%32%0A%33+%34" | urldecode
1 2
3 4

GNU sed

This script uses an extension of GNU sed (\xNN).

# (C) 2006 GPL by Huidae Cho
urldecode(){
  echo "$@" | sed 's/^.*$/'"`echo "$@" | sed 'y/+/ /; s/%/\\\\x/g; s/\//\\\\\//g'`"'/'
}

$ urldecode "%31+%32%0A%33+%34"
1 2
3 4

GNU Bourne-Again Shell (bash) and sed

It's extremely fast!

# (C) 2004 GPL by Huidae Cho
urldecode(){
  echo -e "$(sed 'y/+/ /; s/%/\\x/g')"
}
$ echo "%31+%32%0A%33+%34" | urldecode

$ echo -e "$(echo "%31+%32%0A%33+%34" | sed 'y/+/ /; s/%/\\x/g')"

outputs

1 2
3 4

Pure bash version: http://thijs.dalhuijsen.com/code/index.shtml?req=5

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