From 0a903e69fbd9b19d8d8da0593f31dec5807af566 Mon Sep 17 00:00:00 2001
From: Kahrl <kahrl@gmx.net>
Date: Thu, 29 Aug 2013 05:56:48 +0200
Subject: Implement urlencode and urldecode

---
 src/util/string.cpp | 43 ++++++++++++++++++++++++++++++++++++++-----
 src/util/string.h   |  3 ++-
 2 files changed, 40 insertions(+), 6 deletions(-)

(limited to 'src/util')

diff --git a/src/util/string.cpp b/src/util/string.cpp
index 39a14598b..925d0ea35 100644
--- a/src/util/string.cpp
+++ b/src/util/string.cpp
@@ -21,8 +21,12 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "pointer.h"
 #include "numeric.h"
 
+#include <sstream>
+#include <iomanip>
+
 #include "../sha1.h"
 #include "../base64.h"
+#include "../hex.h"
 #include "../porting.h"
 
 std::wstring narrow_to_wide(const std::string& mbs)
@@ -68,11 +72,40 @@ std::string translatePassword(std::string playername, std::wstring password)
 	return pwd;
 }
 
-size_t curl_write_data(char *ptr, size_t size, size_t nmemb, void *userdata) {
-    std::ostringstream *stream = (std::ostringstream*)userdata;
-    size_t count = size * nmemb;
-    stream->write(ptr, count);
-    return count;
+std::string urlencode(std::string str)
+{
+	// Encodes non-unreserved URI characters by a percent sign
+	// followed by two hex digits. See RFC 3986, section 2.3.
+	static const char url_hex_chars[] = "0123456789ABCDEF";
+	std::ostringstream oss(std::ios::binary);
+	for (u32 i = 0; i < str.size(); i++) {
+		unsigned char c = str[i];
+		if (isalnum(c) || c == '-' || c == '.' || c == '_' || c == '~')
+			oss << c;
+		else
+			oss << "%"
+				<< url_hex_chars[(c & 0xf0) >> 4]
+				<< url_hex_chars[c & 0x0f];
+	}
+	return oss.str();
+}
+
+std::string urldecode(std::string str)
+{
+	// Inverse of urlencode
+	std::ostringstream oss(std::ios::binary);
+	for (u32 i = 0; i < str.size(); i++) {
+		unsigned char highvalue, lowvalue;
+		if (str[i] == '%' &&
+				hex_digit_decode(str[i+1], highvalue) &&
+				hex_digit_decode(str[i+2], lowvalue)) {
+			oss << (char) ((highvalue << 4) | lowvalue);
+			i += 2;
+		}
+		else
+			oss << str[i];
+	}
+	return oss.str();
 }
 
 u32 readFlagString(std::string str, FlagDesc *flagdesc) {
diff --git a/src/util/string.h b/src/util/string.h
index 81855962f..e5a60bc47 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -317,7 +317,8 @@ inline std::string unescape_string(std::string &s)
 }
 
 std::string translatePassword(std::string playername, std::wstring password);
-size_t curl_write_data(char *ptr, size_t size, size_t nmemb, void *userdata);
+std::string urlencode(std::string str);
+std::string urldecode(std::string str);
 u32 readFlagString(std::string str, FlagDesc *flagdesc);
 std::string writeFlagString(u32 flags, FlagDesc *flagdesc);
 char *mystrtok_r(char *s, const char *sep, char **lasts);
-- 
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