Initial commit

src/NfcAime.Dll/FelicaCommandBuilder.cs

@@ -0,0 +1,38 @@
+using System;
+
+namespace NfcAime.Dll;
+
+internal static class FelicaCommandBuilder
+{
+    internal static byte[] BuildPollingCommand() => new byte[] { 0x06, 0x00, 0x88, 0xB4, 0x01, 0x0F };
+
+    internal static byte[] BuildReadWithoutEncryptionCommand(ReadOnlySpan<byte> idm)
+    {
+        if (idm.Length != 8)
+        {
+            throw new ArgumentException("IDm must be exactly 8 bytes.", nameof(idm));
+        }
+
+        // FeliCa Read Without Encryption:
+        // Byte 0: Length (16 bytes = 0x10)
+        // Byte 1: Command Code (0x06)
+        // Byte 2-9: IDm
+        // Byte 10: Number of Services (0x01)
+        // Byte 11-12: Service Code List (0x0B, 0x00 for Service 0x000B, Little Endian)
+        // Byte 13: Number of Blocks (0x01)
+        // Byte 14-15: Block List (0x80, 0x00 for Service 0, Block 0)
+        
+        byte[] command = new byte[16];
+        command[0] = 0x10; 
+        command[1] = 0x06;
+        idm.CopyTo(command.AsSpan(2, 8));
+        command[10] = 0x01;
+        command[11] = 0x0B;
+        command[12] = 0x00;
+        command[13] = 0x01;
+        command[14] = 0x80;
+        command[15] = 0x00;
+        
+        return command;
+    }
+}