1 files changed, 81 insertions, 0 deletions
diff --git a/src/url.c b/src/url.c
new file mode 100755
index 00000000..c4933b20
--- /dev/null
+++ b/src/url.c
@@ -0,0 +1,81 @@
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "common.h"
+#include "log.h"
+#include "url.h"
+
+// ----------------------------------------------------------------------------
+// URL encode / decode
+// code from: http://www.geekhideout.com/urlcode.shtml
+
+/* Converts a hex character to its integer value */
+char from_hex(char ch) {
+	return (char)(isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10);
+}
+
+/* Converts an integer value to its hex character*/
+char to_hex(char code) {
+	static char hex[] = "0123456789abcdef";
+	return hex[code & 15];
+}
+
+/* Returns a url-encoded version of str */
+/* IMPORTANT: be sure to free() the returned string after use */
+char *url_encode(char *str) {
+	char *pstr = str,
+		*buf = malloc(strlen(str) * 3 + 1),
+		*pbuf = buf;
+
+	while (*pstr) {
+		if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~')
+			*pbuf++ = *pstr;
+
+		else if (*pstr == ' ')
+			*pbuf++ = '+';
+
+		else
+			*pbuf++ = '%', *pbuf++ = to_hex(*pstr >> 4), *pbuf++ = to_hex(*pstr & 15);
+
+		pstr++;
+	}
+
+	*pbuf = '\0';
+
+	return buf;
+}
+
+/* Returns a url-decoded version of str */
+/* IMPORTANT: be sure to free() the returned string after use */
+char *url_decode(char *str) {
+	char *pstr = str,
+		*buf = malloc(strlen(str) + 1),
+		*pbuf = buf;
+
+	if(!buf) fatal("Cannot allocate memory.");
+
+	while (*pstr) {
+		if (*pstr == '%') {
+			if (pstr[1] && pstr[2]) {
+				*pbuf++ = from_hex(pstr[1]) << 4 | from_hex(pstr[2]);
+				pstr += 2;
+			}
+		}
+		else if (*pstr == '+')
+			*pbuf++ = ' ';
+
+		else
+			*pbuf++ = *pstr;
+
+		pstr++;
+	}
+
+	*pbuf = '\0';
+
+	return buf;
+}
+