X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/813fb2f63a553c957e917ede5f119b021d6ce391..008676633c2ad2c325837c2b64915f7ded690a8f:/bsd/libkern/url_encode.c

diff --git a/bsd/libkern/url_encode.c b/bsd/libkern/url_encode.c
new file mode 100644
index 000000000..28534ada1
--- /dev/null
+++ b/bsd/libkern/url_encode.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2016 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+#include <libkern/libkern.h>
+
+static int
+hex2int(int c)
+{
+	if (c >= '0' && c <= '9') {
+		return c - '0';
+	} else if (c >= 'A' && c <= 'F') {
+		return c - 'A' + 10;
+	} else if (c >= 'a' && c <= 'f') {
+		return c - 'a' + 10;
+	}
+	return 0;
+}
+
+static bool
+isprint(int ch)
+{
+	return ch >= 0x20 && ch <= 0x7e;
+}
+
+/*
+ * In-place decode of URL percent-encoded str
+ */
+void
+url_decode(char *str)
+{
+	if (!str) {
+		return;
+	}
+
+	while (*str) {
+		if (*str == '%') {
+			char c = 0;
+			char *esc = str++; /* remember the start of the escape sequence */
+
+			if (*str) {
+				c += hex2int(*str++);
+			}
+			if (*str) {
+				c = (c << 4) + hex2int(*str++);
+			}
+
+			if (isprint(c)) {
+				/* overwrite the '%' with the new char, and bump the rest of the
+				 * string down a few characters */
+				*esc++ = c;
+				str = memmove(esc, str, strlen(str)+1);
+			} else {
+				str++;
+			}
+
+		} else {
+			str++;
+		}
+	}
+}