From 935f4d3d0760fb97b2b46bc434703597bf894ddb Mon Sep 17 00:00:00 2001
From: sbosse <sbosse@uni-bremen.de>
Date: Mon, 21 Jul 2025 22:59:51 +0200
Subject: [PATCH] Mon 21 Jul 22:43:21 CEST 2025

---
 js/x11/core/unpackbuffer.js | 75 +++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 js/x11/core/unpackbuffer.js

diff --git a/js/x11/core/unpackbuffer.js b/js/x11/core/unpackbuffer.js
new file mode 100644
index 0000000..2fdbfea
--- /dev/null
+++ b/js/x11/core/unpackbuffer.js
@@ -0,0 +1,75 @@
+// unpack for static buffer
+	
+// TODO: use as fallback only if v0.5+ fuffer is not available
+// TODO: remove duplicate code
+var argument_length = {};
+argument_length.C = 1;
+argument_length.S = 2;
+argument_length.s = 2;
+argument_length.L = 4;
+argument_length.x = 1;
+
+module.exports.addUnpack = function(Buffer)
+{
+    Buffer.prototype.unpack = function(format, offset)
+    {
+        if (!offset)
+            offset = 0;
+
+        var data = [];
+        var current_arg = 0;
+        while (current_arg < format.length)
+        {
+            var arg = format[current_arg];
+            switch (arg) {
+            case 'C':
+                data.push(this.readUInt8(offset++));
+                break;
+            case 'c':
+                data.push(this.readInt8(offset++));
+                break;
+            case 'S':
+                data.push(this.readUInt16LE(offset));
+                offset += 2;
+                break;
+            case 's':
+                data.push(this.readInt16LE(offset));
+                offset += 2;
+                break;
+            case 'n':
+                data.push(this.readUInt16BE(offset));
+                offset += 2;
+                break;
+            case 'L':
+                data.push(this.readUInt32LE(offset));
+                offset += 4;
+                break;
+            case 'l':
+                data.push(this.readInt32LE(offset));
+                offset += 4;
+                break;
+            case 'x':
+                offset++;
+                break;
+            }
+            current_arg++;
+        }
+        return data;
+    }
+
+    /*  
+    Buffer.prototype.skip = function(n)
+    {
+        offset += n;
+    }
+    */
+
+    Buffer.prototype.unpackString = function(n, offset)
+    {
+        var res = '';
+        var end = offset + n;
+        while(offset < end)
+            res += String.fromCharCode(this[offset++]);
+        return res;
+    }
+}