#!/usr/bin/env ruby

# $Id$
# $URL$

# Parser voor slocate.db bestanden. Toont een filelisting van alle bestanden
# uit de database.

require "getoptlong"

def parse_options
	@options = {}
	begin
		opts = GetoptLong.new(
			[ "-i",			GetoptLong::REQUIRED_ARGUMENT ],
			[ "-h", "--help",	GetoptLong::NO_ARGUMENT ],
			[ "-l",			GetoptLong::NO_ARGUMENT ]
		)
		opts.quiet=true
		opts.each do |opt, arg|
			@options[opt] = arg
		end
		if @options["-h"]
			usage
		end
	rescue GetoptLong::InvalidOption
		print "#{$!}\n"
		usage
	end
	# default values
	if @options["-l"].nil?
		@options["-l"] = false
	end
	if @options["-i"].nil?
		@options["-i"] = "slocate.db"
	end
	return @options
end

def usage
	print <<XXX
Usage: slocatedb-dump.rb [-i <inputfile>] [-l] [-h]

-i <inputfile>	use <inputfile> for input (default: slocate.db)
-l		parse as traditional locate database format (default slocate.db style)
-h		this help message
XXX
	exit
end


def signedbyte(byte)
	if byte >= 128
		((byte^0xff)+1)*-1
	else
		byte
	end
end

parse_options

fh = File.new(@options["-i"], "r")

# dit byte schijnt heel het verschil te zijn met traditionele locate databases
# dus bij een traditionele even 4 regels niet gebruiken
if ! @options["-l"]
	secure=fh.read(1)
	if secure == '1'
		puts "Uses security features..."
	end
end

curdepth=0
curpaths=""
while true
	char = fh.read(1)
	if char.nil?
		# we're done
		exit
	end
	depth = signedbyte(char[0])
	curdepth+=depth
	curpaths=curpaths[0...curdepth]
	newname=''
	while(b=fh.read(1)) != "\000"
		newname += b
	end
	curpaths+=newname
	puts curpaths
end