Class JavaClass::ClassFile::ClassMagic
In: lib/javaclass/classfile/class_magic.rb
Parent: Object

The CAFEBABE magic of a class file. This just checks if CAFEBABE is here.

Author:Peter Kofler

Methods

bytes   check   new   valid?  

Constants

CAFE_BABE = "\xCA\xFE\xBA\xBE"

Public Class methods

new(data, start=0)

Check the class magic in the data beginning at position start (which is usually 0).

[Source]

# File lib/javaclass/classfile/class_magic.rb, line 13
      def initialize(data, start=0)
        @bytes = data[start..start+3]
      end

Public Instance methods

bytes()

Return the value of the magic in this class.

[Source]

# File lib/javaclass/classfile/class_magic.rb, line 23
      def bytes
        @bytes.dup
      end
check(msg='invalid java class magic')

Check if this magic is valid and raise an ClassFormatError if not with an optional msg .

[Source]

# File lib/javaclass/classfile/class_magic.rb, line 28
      def check(msg='invalid java class magic')
        unless valid?
          raise(ClassFormatError, msg)
        end
      end
valid?()

Return true if the data was valid, i.e. if the class started with CAFEBABE.

[Source]

# File lib/javaclass/classfile/class_magic.rb, line 18
      def valid?
        @bytes.same_bytes_as?(CAFE_BABE)
      end

[Validate]