class BitStream::String
Public Class Methods
instance(props, byte_len)
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# File lib/types/string.rb, line 13 def self.instance(props, byte_len) new byte_len end
new(byte_len)
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# File lib/types/string.rb, line 17 def initialize(byte_len) @byte_len = byte_len end
Public Instance Methods
length()
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# File lib/types/string.rb, line 21 def length @byte_len * 8 end
read(s, offset)
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# File lib/types/string.rb, line 25 def read(s, offset) bitoffset = offset % 8 head = offset / 8 tail = (offset + @byte_len * 8 + 7) / 8 val = s[head...tail] Utils.bit_lshift(val, bitoffset) val.slice!(val.size - 1) if bitoffset != 0 return FieldInfo.new(val, @byte_len * 8) end
write(s, offset, data)
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# File lib/types/string.rb, line 36 def write(s, offset, data) head = offset / 8 tail = (offset + @byte_len * 8 + 7) / 8 if offset % 8 != 0 bitoffset = offset % 8 Utils.bit_rshift(data, bitoffset) s[head] = ((data[0].ord & 0xff >> bitoffset) | (s[head].ord & 0xff << (8 - bitoffset))).chr s[tail - 1] = (data[data.size - 1].ord & 0xff << (8 - bitoffset)).chr s[(head + 1)..(tail - 2)] = data[1..(data.size - 2)] else s[head...tail] = data end return @byte_len * 8 end