Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/javaclass/string_ux.rb,
lib/javaclass/java_name.rb

Overview

Add some unpack helper methods for HI-LO byte order (network byte order) contained in this string.

Author

Peter Kofler

Direct Known Subclasses

JavaClass::JavaName

Instance Method Summary collapse

Instance Method Details

#double(index = 0) ⇒ Object

Return the index’th and the next 7 elements as double precision float.



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# File 'lib/javaclass/string_ux.rb', line 35

def double(index=0)
  self[index..index+7].unpack('G')[0]
end

#single(index = 0) ⇒ Object

Return the index’th and the next 3 elements as single precision float.

See

steve.hollasch.net/cgindex/coding/ieeefloat.html

See

blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/196633



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# File 'lib/javaclass/string_ux.rb', line 30

def single(index=0)
  self[index..index+3].unpack('g')[0]
end

#to_javaname ⇒ Object

Convert a Java classname or Java class filename to JavaClass::JavaName instance. If it’s a pathname then it must be relative to the classpath.



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# File 'lib/javaclass/java_name.rb', line 86

def to_javaname
  JavaClass::JavaName.new(self)
end

#u1(index = 0) ⇒ Object

Return the index’th element as byte.



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# File 'lib/javaclass/string_ux.rb', line 7

def u1(index=0)
  self[index]
end

#u2(index = 0) ⇒ Object

Return the index’th and the next element as unsigned word.



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# File 'lib/javaclass/string_ux.rb', line 12

def u2(index=0)
  self[index..index+1].unpack('n')[0]
  # same as self[index]*256 + self[index+1] 
end

#u4(index = 0) ⇒ Object

Return the index’th and the next 3 elements as unsigned dword.



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# File 'lib/javaclass/string_ux.rb', line 18

def u4(index=0)
  self[index..index+3].unpack('N')[0]
end

#u8(index = 0) ⇒ Object

Return the index’th and the next 7 elements as unsigned qword.



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# File 'lib/javaclass/string_ux.rb', line 23

def u8(index=0)
  u4(index) * 256**4 + u4(index+4)
end