From 2bcfa97e1b3760e0c9acbdf57bfe4ae631e9f037 Mon Sep 17 00:00:00 2001
From: Lorenz Stechauner <lorenz.stechauner@necronda.net>
Date: Sun, 13 Dec 2020 16:05:55 +0100
Subject: [PATCH] Added url_encode and url_decode

---
 src/utils.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 src/utils.h |  4 ++++
 2 files changed, 55 insertions(+)

diff --git a/src/utils.c b/src/utils.c
index f1a1a40..40aebbf 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -21,3 +21,54 @@ char *format_duration(unsigned long micros, char *buf) {
     }
     return buf;
 }
+
+int url_encode(const char *str, char *enc, ssize_t *size) {
+    char *ptr = enc;
+    char ch;
+    memset(enc, 0, *size);
+    for (int i = 0; i < strlen(str); i++, ptr++) {
+        if ((ptr - enc) >= *size) {
+            printf("%li %li\n", ptr - enc, *size);
+            return -1;
+        }
+        ch = str[i];
+        if (ch == ':' || ch == '/' || ch == '?' || ch == '#' || ch == '[' || ch == ']' || ch == '@' || ch == '!' ||
+            ch == '$' || ch == '&' || ch == '\'' || ch == '(' || ch == ')' || ch == '*' || ch == '+' || ch == ',' ||
+            ch == ';' || ch == '=' || ch < ' ' || ch > '~') {
+            if ((ptr - enc + 2) >= *size) {
+                return -1;
+            }
+            sprintf(ptr, "%%%02X", ch);
+            ptr += 2;
+        } else if (ch == ' ') {
+            ptr[0] = '+';
+        } else {
+            ptr[0] = ch;
+        }
+    }
+    *size = ptr - enc;
+    return 0;
+}
+
+int url_decode(const char *str, char *dec, ssize_t *size) {
+    char *ptr = dec;
+    char ch, buf[3];
+    memset(dec, 0, *size);
+    for (int i = 0; i < strlen(str); i++, ptr++) {
+        if ((ptr - dec) >= *size) {
+            return -1;
+        }
+        ch = str[i];
+        if (ch == '+') {
+            ch = ' ';
+        } else if (ch == '%') {
+            memcpy(buf, str + i + 1, 2);
+            buf[2] = 0;
+            ch = (char) strtol(buf, NULL, 16);
+            i += 2;
+        }
+        ptr[0] = ch;
+    }
+    *size = ptr - dec;
+    return 0;
+}
diff --git a/src/utils.h b/src/utils.h
index bf3eadd..954e297 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -21,4 +21,8 @@ char *log_prefix;
 
 char *format_duration(unsigned long micros, char *buf);
 
+int url_encode(const char *str, char *enc, ssize_t *size);
+
+int url_decode(const char *str, char *dec, ssize_t *size);
+
 #endif //NECRONDA_SERVER_UTILS_H