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Size: 1.46 KB
Versions: 5
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Stored size: 1.46 KB
Contents
# frozen_string_literal: true
module Android
class Dex
class << self
# parse uleb128(unsigned integer) data
# @param [String] data target byte data
# @param [Integer] offset
# @return [Integer, Integer] parsed value and parsed byte length
# @see http://en.wikipedia.org/wiki/LEB128
def uleb128(data, offset=0)
result = 0
shift = 0
d = data[offset...data.size]
(0..4).each do |i|
byte = d.getbyte(i)
result |= ((byte & 0x7f) << shift)
return result, i+1 if ((byte & 0x80) == 0)
shift += 7
end
end
# parse uleb128 + 1 data
# @param [String] data target byte data
# @param [Integer] offset
# @return [Integer, Integer] parsed value and parsed byte length
def uleb128p1(data, offset=0)
ret, len = self.uleb128(data, offset)
return (ret - 1), len
end
# parse sleb128(signed integer) data
# @param [String] data target byte data
# @param [Integer] offset
# @return [Integer, Integer] parsed value and parsed byte length
def sleb128(data, offset=0)
result = 0
shift = 0
d = data[offset...data.size]
(0..4).each do |i|
byte = d.getbyte(i)
result |=((byte & 0x7F) << shift)
return (0 == (byte & 0x40) ? result : result - (1 << (shift+7))), i+1 if ((byte & 0x80) == 0)
shift += 7
end
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems