X-Git-Url: http://git.xonotic.org/?a=blobdiff_plain;f=qcsrc%2Fcommon%2Futil.qc;h=23d4f3431941958bbf188467aa90ab8ede62061e;hb=17a8bb19afed00060ca20dac39df4b5a73ee3a42;hp=baf60b5d88156d8f03f91b1e03701eed049a1424;hpb=8bac780bb3585a2668469ea787ca92474bb89ed5;p=xonotic%2Fxonotic-data.pk3dir.git

diff --git a/qcsrc/common/util.qc b/qcsrc/common/util.qc
index baf60b5d8..23d4f3431 100644
--- a/qcsrc/common/util.qc
+++ b/qcsrc/common/util.qc
@@ -236,6 +236,16 @@ string fstrunzone(string s)
 	return sc;
 }
 
+float fexists(string f)
+{
+    float fh;
+    fh = fopen(f, FILE_READ);
+    if (fh < 0)
+        return FALSE;
+    fclose(fh);
+    return TRUE;
+}
+
 // Databases (hash tables)
 #define DB_BUCKETS 8192
 void db_save(float db, string pFilename)
@@ -2007,3 +2017,37 @@ string CTX(string s)
 		return s;
 	return substring(s, p+1, -1);
 }
+
+// x-encoding (encoding as zero length invisible string)
+const string XENCODE_2  = "xX";
+const string XENCODE_22 = "0123456789abcdefABCDEF";
+string xencode(float f)
+{
+	float a, b, c, d;
+	d = mod(f, 22); f = floor(f / 22);
+	c = mod(f, 22); f = floor(f / 22);
+	b = mod(f, 22); f = floor(f / 22);
+	a = mod(f,  2); // f = floor(f /  2);
+	return strcat(
+		"^",
+		substring(XENCODE_2,  a, 1),
+		substring(XENCODE_22, b, 1),
+		substring(XENCODE_22, c, 1),
+		substring(XENCODE_22, d, 1)
+	);
+}
+float xdecode(string s)
+{
+	float a, b, c, d;
+	if(substring(s, 0, 1) != "^")
+		return -1;
+	if(strlen(s) < 5)
+		return -1;
+	a = strstrofs(XENCODE_2,  substring(s, 1, 1), 0);
+	b = strstrofs(XENCODE_22, substring(s, 2, 1), 0);
+	c = strstrofs(XENCODE_22, substring(s, 3, 1), 0);
+	d = strstrofs(XENCODE_22, substring(s, 4, 1), 0);
+	if(a < 0 || b < 0 || c < 0 || d < 0)
+		return -1;
+	return ((a * 22 + b) * 22 + c) * 22 + d;
+}