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authorDaniel Baumann <daniel.baumann@progress-linux.org>2018-11-07 12:22:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2018-11-07 12:22:44 +0000
commit1e6c93250172946eeb38e94a92a1fd12c9d3011e (patch)
tree8ca5e16dfc7ad6b3bf2738ca0a48408a950f8f7e /libnetdata/url/url.c
parentUpdate watch file (diff)
downloadnetdata-1e6c93250172946eeb38e94a92a1fd12c9d3011e.tar.xz
netdata-1e6c93250172946eeb38e94a92a1fd12c9d3011e.zip
Merging upstream version 1.11.0+dfsg.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'libnetdata/url/url.c')
-rw-r--r--libnetdata/url/url.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/libnetdata/url/url.c b/libnetdata/url/url.c
new file mode 100644
index 000000000..07a9f8069
--- /dev/null
+++ b/libnetdata/url/url.c
@@ -0,0 +1,81 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../libnetdata.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 *buf, *pbuf;
+
+ pbuf = buf = mallocz(strlen(str) * 3 + 1);
+
+ while (*str) {
+ if (isalnum(*str) || *str == '-' || *str == '_' || *str == '.' || *str == '~')
+ *pbuf++ = *str;
+
+ else if (*str == ' ')
+ *pbuf++ = '+';
+
+ else
+ *pbuf++ = '%', *pbuf++ = to_hex(*str >> 4), *pbuf++ = to_hex(*str & 15);
+
+ str++;
+ }
+ *pbuf = '\0';
+
+ pbuf = strdupz(buf);
+ freez(buf);
+ return pbuf;
+}
+
+/* Returns a url-decoded version of str */
+/* IMPORTANT: be sure to free() the returned string after use */
+char *url_decode(char *str) {
+ size_t size = strlen(str) + 1;
+
+ char *buf = mallocz(size);
+ return url_decode_r(buf, str, size);
+}
+
+char *url_decode_r(char *to, char *url, size_t size) {
+ char *s = url, // source
+ *d = to, // destination
+ *e = &to[size - 1]; // destination end
+
+ while(*s && d < e) {
+ if(unlikely(*s == '%')) {
+ if(likely(s[1] && s[2])) {
+ char t = from_hex(s[1]) << 4 | from_hex(s[2]);
+ // avoid HTTP header injection
+ *d++ = (char)((isprint(t))? t : ' ');
+ s += 2;
+ }
+ }
+ else if(unlikely(*s == '+'))
+ *d++ = ' ';
+
+ else
+ *d++ = *s;
+
+ s++;
+ }
+
+ *d = '\0';
+
+ return to;
+}