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Packages/com.voidbotz.fonepayunity/Runtime/QR/FonepayQRGenerator.Codewords.cs

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+using System;
+using System.Collections.Generic;
+
+namespace Darkmatter.Fonepay
+{
+    public static partial class FonepayQRGenerator
+    {
+        static byte[] BuildCodewords(byte[] data, int version, EccLevel ecc,
+            (int total, int ecPerBlock, int blocks) ecBlocks)
+        {
+            var bits = new List<bool>();
+            bits.AddRange(new[] { false, true, false, false }); // byte mode
+            int len = data.Length;
+            for (int i = 7; i >= 0; i--) bits.Add(((len >> i) & 1) == 1);
+            foreach (byte b in data)
+                for (int i = 7; i >= 0; i--)
+                    bits.Add(((b >> i) & 1) == 1);
+
+            int dcBytes = DataCodewords(version, ecc);
+            int targetBits = dcBytes * 8;
+            for (int i = 0; i < 4 && bits.Count < targetBits; i++) bits.Add(false);
+            while (bits.Count % 8 != 0) bits.Add(false);
+
+            bool[] padA = { true, true, true, false, true, true, false, false };
+            bool[] padB = { false, false, false, true, false, false, false, true };
+            int pi = 0;
+            while (bits.Count < targetBits)
+            {
+                bits.AddRange(pi % 2 == 0 ? padA : padB);
+                pi++;
+            }
+
+            byte[] dc = new byte[dcBytes];
+            for (int i = 0; i < dcBytes; i++)
+                for (int b = 0; b < 8; b++)
+                    if (bits[i * 8 + b])
+                        dc[i] |= (byte)(1 << (7 - b));
+
+            int blocks = ecBlocks.blocks;
+            int ecPer = ecBlocks.ecPerBlock;
+            int blockSize = dcBytes / blocks;
+            byte[][] dcBlocks = new byte[blocks][];
+            byte[][] ecBlocksArr = new byte[blocks][];
+            for (int i = 0; i < blocks; i++)
+            {
+                dcBlocks[i] = new byte[blockSize];
+                Array.Copy(dc, i * blockSize, dcBlocks[i], 0, blockSize);
+                ecBlocksArr[i] = ReedSolomon(dcBlocks[i], ecPer);
+            }
+
+            var result = new List<byte>();
+            for (int i = 0; i < blockSize; i++)
+                for (int b = 0; b < blocks; b++)
+                    result.Add(dcBlocks[b][i]);
+            for (int i = 0; i < ecPer; i++)
+                for (int b = 0; b < blocks; b++)
+                    result.Add(ecBlocksArr[b][i]);
+
+            return result.ToArray();
+        }
+    }
+}