Class: LS4::FileUpdateLog::Header

Inherits:
Object
  • Object
show all
Defined in:
lib/ls4/service/ulog_file.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(atime, pos) ⇒ Header

Returns a new instance of Header.



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# File 'lib/ls4/service/ulog_file.rb', line 136

def initialize(atime, pos)
	@atime = atime
	@pos = pos
end

Instance Attribute Details

#atime ⇒ Object (readonly)

Returns the value of attribute atime.



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# File 'lib/ls4/service/ulog_file.rb', line 141

def atime
  @atime
end

#pos ⇒ Object (readonly)

Returns the value of attribute pos.



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# File 'lib/ls4/service/ulog_file.rb', line 142

def pos
  @pos
end

Class Method Details

.load(raw) ⇒ Object 



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# File 'lib/ls4/service/ulog_file.rb', line 153

def self.load(raw)
	magick = raw[0,8]
	if magick != MAGICK
		raise "magick not match"
	end

	atime = raw[8,8].unpack('NN')
	atime = (atime[0]<<32) | atime[1]
	pos = raw[16,8].unpack('NN')
	pos = (pos[0]<<32) | pos[1]

	new(atime, pos)
end

.read_offset(stream) ⇒ Object 



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# File 'lib/ls4/service/ulog_file.rb', line 167

def self.read_offset(stream)
	stream.pos = 16
	raw = stream.read(8)
	pos = raw.unpack('NN')
	pos = (pos[0]<<32) | pos[1]
	pos
end

.write_offset(stream, pos) ⇒ Object 



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# File 'lib/ls4/service/ulog_file.rb', line 175

def self.write_offset(stream, pos)
	stream.pos = 16
	raw = [pos>>32, pos&0xffffffff].pack('NN')
	stream.write(raw)
	stream
end

Instance Method Details

#dump ⇒ Object 



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# File 'lib/ls4/service/ulog_file.rb', line 144

def dump
	raw = ""
	raw << MAGICK
	raw << [ atime>>32,  atime&0xffffffff].pack('NN')
	raw << [pos>>32, pos&0xffffffff].pack('NN')
	raw << ([0] * (HEADER_SIZE - raw.size)).pack('C*')
	raw
end