Support urlencoded http authentication credentials

It should be possible to specify usernames in http requests containing
urlencoded characters. This patch adds support for decoding the auth
strings.

Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 87 insertions, 0 deletions

diff --git a/libavformat/urldecode.c b/libavformat/urldecode.c
new file mode 100644
index 0000000000..32460da4f9
--- /dev/null
+++ b/libavformat/urldecode.c
@@ -0,0 +1,87 @@
+/*
+ * Simple URL decoding function
+ * Copyright (c) 2012 Antti Seppälä
+ *
+ * References:
+ *  RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
+ *       T. Berners-Lee et al. The Internet Society, 2005
+ *
+ * based on http://www.icosaedro.it/apache/urldecode.c
+ *          from Umberto Salsi (salsi@icosaedro.it)
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <ctype.h>
+#include <string.h>
+
+#include "libavutil/mem.h"
+#include "libavutil/avstring.h"
+#include "urldecode.h"
+
+char *ff_urldecode(const char *url)
+{
+    int s = 0, d = 0, url_len = 0;
+    char c;
+    char *dest = NULL;
+
+    if (!url)
+        return NULL;
+
+    url_len = strlen(url) + 1;
+    dest = av_malloc(url_len);
+
+    if (!dest)
+        return NULL;
+
+    while (s < url_len) {
+        c = url[s++];
+
+        if (c == '%' && s + 2 < url_len) {
+            char c2 = url[s++];
+            char c3 = url[s++];
+            if (isxdigit(c2) && isxdigit(c3)) {
+                c2 = av_tolower(c2);
+                c3 = av_tolower(c3);
+
+                if (c2 <= '9')
+                    c2 = c2 - '0';
+                else
+                    c2 = c2 - 'a' + 10;
+
+                if (c3 <= '9')
+                    c3 = c3 - '0';
+                else
+                    c3 = c3 - 'a' + 10;
+
+                dest[d++] = 16 * c2 + c3;
+
+            } else { /* %zz or something other invalid */
+                dest[d++] = c;
+                dest[d++] = c2;
+                dest[d++] = c3;
+            }
+        } else if (c == '+') {
+            dest[d++] = ' ';
+        } else {
+            dest[d++] = c;
+        }
+
+    }
+
+    return dest;
+}