[OpenBIOS] [PATCH v2] add copyright message to root node at startup

[Programmingkid]

Mac OS 9 and earlier require that OpenBIOS has Apple's copyright message in the
root node, under the copyright property. This patch adds that message. This
patch also removes the code from the adler32 word that did the same thing.
Operating systems might need to read the copyright message before the adler32
word is called. So this patch takes care of that problem by supplying the
copyright message at startup. This makes the copyright adding code in the
adler32 word obsolete. Only the Macintosh emulator will have this message added
to the root node. Other machines such as PREP don't run Apple's software so the
copyright message will not be added to them.

Signed-off-by: John Arbuckle <programmingkidx at gmail.com>

Changes from version 1:
Removed the add_copyright() message from the ARCH_HEATHROW target because the
real life version of this machine doesn't have the copyright message.


Index: arch/ppc/qemu/init.c
===================================================================
--- arch/ppc/qemu/init.c	(revision 1378)
+++ arch/ppc/qemu/init.c	(working copy)
@@ -739,6 +739,32 @@
     RET(s2 << 16 | s1);
 }
 
+/* Encodes and decodes a string */
+static void string_encoder (unsigned char *string, int length) {
+    const int encoder = 1;
+    int i;
+    for (i = 0; i < length; i++) {
+        string[i] ^= encoder;
+    }
+}
+
+/*
+ * Adds the copyright string to the root node.
+ * Classic Mac OS requires it to boot.
+ */
+static void add_copyright()
+{
+    const int size_of_string = 60;
+    unsigned char message[size_of_string + 1];
+    snprintf(message, size_of_string + 1, "%s", "Bnqxshfiu!0892,3110!@qqmd!Bnl"
+                                             "qtuds-!Hob/!@mm!Shfiur!Sdrdswde");
+    string_encoder(message, size_of_string);
+    push_str(message);
+    fword("encode-string");
+    push_str("copyright");
+    fword("property");
+}
+
 void
 arch_of_init(void)
 {
@@ -831,6 +857,8 @@
 
     case ARCH_MAC99:
     case ARCH_MAC99_U3:
+        /* Kept here because PREP isn't made to run Macintosh software */
+        add_copyright();
     case ARCH_PREP:
     default:
 
Index: arch/ppc/qemu/qemu.fs
===================================================================
--- arch/ppc/qemu/qemu.fs	(revision 1378)
+++ arch/ppc/qemu/qemu.fs	(working copy)
@@ -99,19 +99,6 @@
 \ -------------------------------------------------------------------------
 
 : adler32 ( adler buf len -- checksum )
-  \ Since Mac OS 9 is the only system using this word, we take this
-  \ opportunity to inject a copyright message that is necessary for the
-  \ system to boot.
-  " Copyright 1983-2001 Apple Computer, Inc. THIS MESSAGE FOR COMPATIBILITY ONLY"
-  encode-string " copyright"
-  " /" find-package if
-    " set-property" $find if
-      execute
-    else
-      3drop drop
-    then
-  then
-
   ( adler buf len )
 
   " (adler32)" $find if