Added basic PC/SC (WinSCard) smartcard support. (0.17.0)

lib/hex.fun

@@ -0,0 +1,79 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://hanez.org/project/fun/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-10-02
+ */
+
+// Hex utility functions
+
+fun hex_val(ch)
+  if (ch == "0")
+    return 0
+  else if (ch == "1")
+    return 1
+  else if (ch == "2")
+    return 2
+  else if (ch == "3")
+    return 3
+  else if (ch == "4")
+    return 4
+  else if (ch == "5")
+    return 5
+  else if (ch == "6")
+    return 6
+  else if (ch == "7")
+    return 7
+  else if (ch == "8")
+    return 8
+  else if (ch == "9")
+    return 9
+  else if (ch == "a" || ch == "A")
+    return 10
+  else if (ch == "b" || ch == "B")
+    return 11
+  else if (ch == "c" || ch == "C")
+    return 12
+  else if (ch == "d" || ch == "D")
+    return 13
+  else if (ch == "e" || ch == "E")
+    return 14
+  else if (ch == "f" || ch == "F")
+    return 15
+  else 
+    return 0
+
+fun hex_to_bytes(hex)
+  s = to_string(hex)
+  out = []
+  number i = 0
+  number n = len(s)
+  while i + 1 < n
+    number b = hex_val(substr(s, i, 1)) * 16 + hex_val(substr(s, i + 1, 1))
+    push(out, b)
+    i = i + 2
+  return out
+
+fun two_hex(n)
+  n = n % 256
+  hexd = "0123456789abcdef"
+  number hi = (n / 16) % 16
+  number lo = n % 16
+  c1 = substr(hexd, hi, 1)
+  c2 = substr(hexd, lo, 1)
+  return c1 + c2
+
+fun bytes_to_hex(arr)
+  res = ""
+  number i = 0
+  number N = len(arr)
+  while i < N
+    res = res + two_hex(arr[i])
+    i = i + 1
+  return res