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From "Emmanuel Bourg (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CONFIGURATION-262) Binary property list format
Date Sun, 21 Jun 2009 23:04:07 GMT

    [ https://issues.apache.org/jira/browse/CONFIGURATION-262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12488775#action_12488775
] 

Emmanuel Bourg edited comment on CONFIGURATION-262 at 6/21/09 4:04 PM:
-----------------------------------------------------------------------

Binary plist parser from the Open Darwin project :

http://www.opensource.apple.com/source/CF/CF-476.18/CFBinaryPList.c

It details the structure of a binary plist file:

{code:xml}
HEADER
	magic number ("bplist")
	file format version

OBJECT TABLE
	variable-sized objects

	Object Formats (marker byte followed by additional info in some cases)
	null	0000 0000
	bool	0000 1000			// false
	bool	0000 1001			// true
	fill	0000 1111			// fill byte
	int	0001 nnnn	...		// # of bytes is 2^nnnn, big-endian bytes
	real	0010 nnnn	...		// # of bytes is 2^nnnn, big-endian bytes
	date	0011 0011	...		// 8 byte float follows, big-endian bytes
	data	0100 nnnn	[int]	...	// nnnn is number of bytes unless 1111 then int count follows, followed
by bytes
	string	0101 nnnn	[int]	...	// ASCII string, nnnn is # of chars, else 1111 then int count,
then bytes
	string	0110 nnnn	[int]	...	// Unicode string, nnnn is # of chars, else 1111 then int count,
then big-endian 2-byte uint16_t
		0111 xxxx			// unused
	uid	1000 nnnn	...		// nnnn+1 is # of bytes
		1001 xxxx			// unused
	array	1010 nnnn	[int]	objref*	// nnnn is count, unless '1111', then int count follows
		1011 xxxx			// unused
	set	1100 nnnn	[int]	objref* // nnnn is count, unless '1111', then int count follows
	dict	1101 nnnn	[int]	keyref* objref*	// nnnn is count, unless '1111', then int count follows
		1110 xxxx			// unused
		1111 xxxx			// unused

OFFSET TABLE
	list of ints, byte size of which is given in trailer
	-- these are the byte offsets into the file
	-- number of these is in the trailer

TRAILER
	byte size of offset ints in offset table
	byte size of object refs in arrays and dicts
	number of offsets in offset table (also is number of objects)
	element # in offset table which is top level object
	offset table offset


{code}



      was (Author: ebourg):
    Binary plist parser from the Open Darwin project :

http://darwinsource.opendarwin.org/10.3/CF-299/Parsing.subproj/CFBinaryPList.c

It details the structure of a binary plist file.


  
> Binary property list format
> ---------------------------
>
>                 Key: CONFIGURATION-262
>                 URL: https://issues.apache.org/jira/browse/CONFIGURATION-262
>             Project: Commons Configuration
>          Issue Type: New Feature
>          Components: Format
>            Reporter: Emmanuel Bourg
>            Priority: Minor
>             Fix For: 2.x
>
>         Attachments: CFBinaryPList.c
>
>
> With OS X 10.4 Apple introduced a variant of the plist format that is compressed using
a binary format. That would be nice to support this format with a BinaryPropertyListConfiguration
class.
> I haven't found the specification of this format. 
> The plutil tool can be used to convert between xml and binary plist files.

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