From 214cf5d60b76b2c91bc32e1198164e5ff3f11d65 Mon Sep 17 00:00:00 2001
From: UbitUmarov <ajlduarte@sapo.pt>
Date: Fri, 15 May 2020 14:41:38 +0100
Subject: [PATCH] llsdXml: do direct base64 encode

---
 OpenSim/Framework/LLSDxmlEncode.cs | 132 ++++++++++++++++++++++++++++-
 1 file changed, 129 insertions(+), 3 deletions(-)

diff --git a/OpenSim/Framework/LLSDxmlEncode.cs b/OpenSim/Framework/LLSDxmlEncode.cs
index b84a16505a..31d5ccc06c 100644
--- a/OpenSim/Framework/LLSDxmlEncode.cs
+++ b/OpenSim/Framework/LLSDxmlEncode.cs
@@ -148,7 +148,22 @@ namespace OpenSim.Framework
             else
             {
                 sb.Append("<binary>"); // encode64 is default
-                sb.Append(Convert.ToBase64String(e,Base64FormattingOptions.None));     
+                base64Encode(e, sb);
+                sb.Append("</binary>");
+            }
+        }
+
+        public static void AddElem(byte[] e, int start, int lenght, StringBuilder sb)
+        {
+            if (start + lenght >= e.Length)
+                lenght = e.Length - start;
+
+            if (e == null || e.Length == 0 || lenght <= 0)
+                sb.Append("binary />");
+            else
+            {
+                sb.Append("<binary>"); // encode64 is default
+                base64Encode(e, start, lenght, sb);
                 sb.Append("</binary>");
             }
         }
@@ -451,12 +466,31 @@ namespace OpenSim.Framework
             sb.Append(name);
             sb.Append("</key>");
 
-            if(e == null || e.Length == 0)
+            if (e == null || e.Length == 0)
                 sb.Append("binary />");
             else
             {
                 sb.Append("<binary>"); // encode64 is default
-                sb.Append(Convert.ToBase64String(e,Base64FormattingOptions.None));
+                base64Encode(e, sb);
+                sb.Append("</binary>");
+            }
+        }
+
+        public static void AddElem(string name, byte[] e, int start, int lenght, StringBuilder sb)
+        {
+            sb.Append("<key>");
+            sb.Append(name);
+            sb.Append("</key>");
+
+            if (start + lenght >= e.Length)
+                lenght = e.Length - start;
+
+            if (e == null || e.Length == 0 || lenght <= 0)
+                sb.Append("binary />");
+            else
+            {
+                sb.Append("<binary>"); // encode64 is default
+                base64Encode(e, start, lenght, sb);
                 sb.Append("</binary>");
             }
         }
@@ -786,5 +820,97 @@ namespace OpenSim.Framework
                 (byte)value
             };
         }
+
+        static readonly char[] base64Chars = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O',
+                                              'P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d',
+                                              'e','f','g','h','i','j','k','l','m','n','o','p','q','r','s',
+                                              't','u','v','w','x','y','z','0','1','2','3','4','5','6','7',
+                                              '8','9','+','/'};
+
+        public static unsafe void base64Encode(byte[] data, StringBuilder sb)
+        {
+            int lenMod3 = data.Length % 3;
+            int len = data.Length - lenMod3;
+
+            fixed (byte* d = data)
+            {
+                fixed (char* b64 = base64Chars)
+                {
+                    int i = 0;
+                    while(i < len)
+                    {
+                        sb.Append(b64[d[i] >> 2]);
+                        sb.Append(b64[((d[i] & 0x03) << 4) | ((d[i + 1] & 0xf0) >> 4)]);
+                        sb.Append(b64[((d[i + 1] & 0x0f) << 2) | ((d[i + 2] & 0xc0) >> 6)]);
+                        sb.Append(b64[d[i + 2] & 0x3f]);
+                        i += 3;
+                    }
+
+                    switch (lenMod3)
+                    {
+                        case 2:
+                        {
+                            i = len;
+                            sb.Append(b64[d[i] >> 2]);
+                            sb.Append(b64[((d[i] & 0x03) << 4) | ((d[i + 1] & 0xf0) >> 4)]);
+                            sb.Append(b64[((d[i + 1] & 0x0f) << 2)]);
+                            sb.Append('=');
+                            break;
+                        }
+                        case 1:
+                        {
+                            i = len;
+                            sb.Append(b64[d[i] >> 2]);
+                            sb.Append(b64[(d[i] & 0x03) << 4]);
+                            sb.Append("==");
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+
+        public static unsafe void base64Encode(byte[] data, int start, int lenght, StringBuilder sb)
+        {
+            int lenMod3 = lenght % 3;
+            int len = start + (lenght - lenMod3);
+
+            fixed (byte* d = data)
+            {
+                fixed (char* b64 = base64Chars)
+                {
+                    int i = start;
+                    while(i < len)
+                    {
+                        sb.Append(b64[(d[i] & 0xfc) >> 2]);
+                        sb.Append(b64[((d[i] & 0x03) << 4) | (d[i + 1] >> 4)]);
+                        sb.Append(b64[((d[i + 1] & 0x0f) << 2) | (d[i + 2] >> 6)]);
+                        sb.Append(b64[d[i + 2] & 0x3f]);
+                        i += 3;
+                    }
+
+                    switch (lenMod3)
+                    {
+                        case 2:
+                        {
+                            i = len;
+                            sb.Append(b64[d[i] >> 2]);
+                            sb.Append(b64[((d[i] & 0x03) << 4) | (d[i + 1] >> 4)]);
+                            sb.Append(b64[((d[i + 1] & 0x0f) << 2)]);
+                            sb.Append('=');
+                            break;
+                        }
+                        case 1:
+                        {
+                            i = len;
+                            sb.Append(b64[d[i] >> 2]);
+                            sb.Append(b64[(d[i] & 0x03) << 4]);
+                            sb.Append("==");
+                            break;
+                        }
+                    }
+                }
+            }
+        }
     }
 }