UDP Circuit basics, message changes

2017-11-26 01:14:02 +00:00
parent 261f28698a
commit 886fced88f
969 changed files with 46221 additions and 43960 deletions
--- a/lib/classes/Zerocoder.ts
+++ b/lib/classes/Zerocoder.ts
@@ -0,0 +1,101 @@
+export class Zerocoder
+{
+    static Encode(buf: Buffer, start: number, end: number): Buffer
+    {
+        // First, run through the data and calculate how many bytes we will save
+        let bytes = 0;
+        let zero = 0;
+        for (let i = start; i <= end; i++)
+        {
+            if (buf[i] === 0)
+            {
+                zero++;
+            }
+            else
+            {
+                if (zero > 0)
+                {
+                    bytes += (zero - 2);
+                    zero = 0;
+                }
+            }
+        }
+        if (zero > 0)
+        {
+            bytes += (zero - 2);
+        }
+
+        const newBuf = Buffer.allocUnsafe((end + 1) - bytes);
+        buf.copy(newBuf, 0, 0, start - 1);
+        let newBufIndex = start;
+        zero = 0;
+        for (let i = start; i <= end; i++)
+        {
+            if (buf[i] === 0)
+            {
+                zero++;
+            }
+            else
+            {
+                if (zero > 0)
+                {
+                    newBuf[newBufIndex++] = 0;
+                    newBuf.writeUInt8(zero, newBufIndex++);
+                    zero = 0;
+                }
+                newBuf[newBufIndex++] = buf[i];
+            }
+        }
+        if (zero > 0)
+        {
+            newBuf[newBufIndex++] = 0;
+            newBuf.writeUInt8(zero, newBufIndex);
+        }
+        return newBuf;
+    }
+    static Decode(buf: Buffer, start: number, end: number): Buffer
+    {
+        // First, run through the data and calculate how many bytes have been compressed
+        let bytes = 0;
+        let zero = false;
+        for (let i = start; i <= end; i++)
+        {
+            if (zero === true)
+            {
+                zero = false;
+                // Minus two bytes for the overhead
+                bytes += buf.readUInt8(i) - 2;
+            }
+            else if (buf[i] === 0)
+            {
+                zero = true;
+            }
+        }
+
+        const newBuf = Buffer.allocUnsafe((end + 1) + bytes);
+        buf.copy(newBuf, 0, 0, start - 1);
+        let newBufIndex = start;
+        zero = false;
+        for (let i = start; i <= end; i++)
+        {
+            if (zero === true)
+            {
+                zero = false;
+                const zeroCount = buf.readUInt8(i);
+                for (let x = 0; x < zeroCount; x++)
+                {
+                    newBuf[newBufIndex++] = 0;
+                }
+            }
+            else if (buf[i] === 0)
+            {
+                zero = true;
+            }
+            else
+            {
+                newBuf[newBufIndex++] = buf[i];
+            }
+        }
+        return newBuf;
+    }
+}