From 93403b036133430b904a6c2d4536d5d77a29e3de Mon Sep 17 00:00:00 2001
From: Andrew Binstock <920630+platypusguy@users.noreply.github.com>
Date: Fri, 15 Nov 2024 22:35:00 -0800
Subject: [PATCH] JACOBIN-608 Initial implementation of <clinit> for
 java/util/HexFormat

---
 src/gfunction/gfunction.go         |  1 +
 src/gfunction/javaUtilHexFormat.go | 61 ++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 src/gfunction/javaUtilHexFormat.go

diff --git a/src/gfunction/gfunction.go b/src/gfunction/gfunction.go
index 3d570241..27e14210 100644
--- a/src/gfunction/gfunction.go
+++ b/src/gfunction/gfunction.go
@@ -130,6 +130,7 @@ func MTableLoadGFunctions(MTable *classloader.MT) {
 	Load_Util_Concurrent_Atomic_AtomicInteger()
 	Load_Util_Concurrent_Atomic_Atomic_Long()
 	Load_Util_HashMap()
+	Load_Util_HexFormat()
 	Load_Util_Locale()
 	Load_Util_Random()
 
diff --git a/src/gfunction/javaUtilHexFormat.go b/src/gfunction/javaUtilHexFormat.go
new file mode 100644
index 00000000..41bfec27
--- /dev/null
+++ b/src/gfunction/javaUtilHexFormat.go
@@ -0,0 +1,61 @@
+/*
+ * Jacobin VM - A Java virtual machine
+ * Copyright (c) 2024 by the Jacobin authors. Consult jacobin.org.
+ * Licensed under Mozilla Public License 2.0 (MPL 2.0) All rights reserved.
+ */
+
+package gfunction
+
+import "jacobin/statics"
+
+// Implementation of some of the functions in in Java/lang/Class.
+
+func Load_Util_HexFormat() {
+
+	MethodSignatures["java/util/HexFormat.<clinit>()V"] =
+		GMeth{
+			ParamSlots: 0,
+			GFunction:  hexMapClinit,
+		}
+}
+
+// hashMapHash accepts a pointer to an object and returns
+// a uint64 MD5 hash value of the pointed-to thing
+func hexMapClinit(params []interface{}) interface{} {
+	DIGITS := [256]int8{
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
+		-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+		-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+	}
+	sDigits := statics.Static{Type: "[B", Value: DIGITS}
+	statics.AddStatic("java/util/HexFormat.DIGITS", sDigits)
+
+	UPPERCASE_DIGITS := [16]int8{
+		'0', '1', '2', '3', '4', '5', '6', '7',
+		'8', '9', 'A', 'B', 'C', 'D', 'E', 'F',
+	}
+	sUppercaseDigits := statics.Static{Type: "[B", Value: UPPERCASE_DIGITS}
+	statics.AddStatic("java/util/HexFormat.UPPERCASE_DIGITS", sUppercaseDigits)
+
+	LOWERCASE_DIGITS := [16]int8{
+		'0', '1', '2', '3', '4', '5', '6', '7',
+		'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
+	}
+	sLowercaseDigits := statics.Static{Type: "[B", Value: LOWERCASE_DIGITS}
+	statics.AddStatic("java/util/HexFormat.LOWERCASE_DIGITS", sLowercaseDigits)
+
+	return nil
+}