Re: hfs patch (Re: State of GRUB on PowerPC)

[Robert Millan <rmh@aybabtu.com>]

On Sat, Feb 07, 2009 at 11:38:36PM -0500, Pavel Roskin wrote:
> Quoting Robert Millan <rmh@aybabtu.com>:
> 
> >On Tue, Jan 27, 2009 at 08:19:41AM +0100, Michel Dänzer wrote:
> >>+/*
> >>+ * unsigned char caseorder[]
> >>+ *
> >>+ * Defines the lexical ordering of characters on the Macintosh
> >>+ *
> >>+ * Composition of the 'casefold' and 'order' tables from ARDI's code
> >>+ * with the entry for 0x20 changed to match that for 0xCA to remove
> >>+ * special case for those two characters.
> >>+ */
> >>+static unsigned char caseorder[256] = {
> >>+ 
> >>0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
> >
> >Could you be more specific about what the table contents mean?
> 
> Michel may know better, but I think it's the order of characters.   
> Those with the lower order go first in the sorted binary tree.  Those  
> with the same order are equivalent on the filesystem level.  That is,  
> "foo" can only be between "bar" and "quux" in the node tree.  "foo"  
> and "Foo" are the same tree node and thus the same file.

I think what we need here is enough information so that someone can understand
what the table means and be able to modify it if need arised.  An undocumented
table just looks like a "blob" of binary data.

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
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  still allow you to remove your data and not access it at all."