add bin/contrib/rc-httpd/lib/urldecode.awk

2016-02-11 16:23:48 -05:00 · 2016-02-11 16:23:48 -05:00 · c046dd4f8f
commit c046dd4f8f
parent 130a3f4454
1 changed files with 39 additions and 0 deletions
--- a/bin/contrib/rc-httpd/lib/urldecode.awk
+++ b/bin/contrib/rc-httpd/lib/urldecode.awk
@ -0,0 +1,39 @@
+# taken from werc
+BEGIN {
+    hextab ["0"] = 0; hextab ["8"] = 8;
+    hextab ["1"] = 1; hextab ["9"] = 9;
+    hextab ["2"] = 2; hextab ["A"] = hextab ["a"] = 10
+    hextab ["3"] = 3; hextab ["B"] = hextab ["b"] = 11;
+    hextab ["4"] = 4; hextab ["C"] = hextab ["c"] = 12;
+    hextab ["5"] = 5; hextab ["D"] = hextab ["d"] = 13;
+    hextab ["6"] = 6; hextab ["E"] = hextab ["e"] = 14;
+    hextab ["7"] = 7; hextab ["F"] = hextab ["f"] = 15;
+}
+{
+    decoded = ""
+    i = 1
+    len = length ($0)
+    while ( i <= len ) {
+        c = substr ($0, i, 1)
+        if ( c == "%" ) {
+            if ( i+2 <= len ) {
+                c1 = substr ($0, i+1, 1)
+                c2 = substr ($0, i+2, 1)
+                if ( hextab [c1] == "" || hextab [c2] == "" ) {
+                    print "WARNING: invalid hex encoding: %" c1 c2 | "cat >&2"
+                } else {
+                    code = 0 + hextab [c1] * 16 + hextab [c2] + 0
+                    c = sprintf ("%c", code)
+                    i = i + 2
+                }
+            } else {
+                print "WARNING: invalid % encoding: " substr ($0, i, len - i)
+            }
+        } else if ( c == "+" ) {
+            c = " "
+        }
+        decoded = decoded c
+        ++i
+    }
+    printf "%s", decoded
+}