Class: Malloc

Inherits:
Object
  • Object
show all
Defined in:
lib/malloc_ext.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#size ⇒ Object (readonly)

Returns the value of attribute size.



27
28
29
 
# File 'lib/malloc_ext.rb', line 27

def size
  @size
end

Class Method Details

.new(size) ⇒ Object 



19
20
21
22
23
 
# File 'lib/malloc_ext.rb', line 19

def new( size )
  retval = orig_new size
  retval.instance_eval { @size = size }
  retval
end

.orig_new ⇒ Object 



17
 
# File 'lib/malloc_ext.rb', line 17

alias_method :orig_new, :new

Instance Method Details

#+(offset) ⇒ Object 



31
32
33
34
35
36
37
38
39
 
# File 'lib/malloc_ext.rb', line 31

def +( offset )
  if offset > @size
    raise "Offset must not be more than #{@size} (but was #{offset})"
  end
  mark, size = self, @size - offset
  retval = orig_plus offset
  retval.instance_eval { @mark, @size = mark, size }
  retval
end

#orig_plus ⇒ Object 



29
 
# File 'lib/malloc_ext.rb', line 29

alias_method :orig_plus, :+

#orig_read ⇒ Object 



41
 
# File 'lib/malloc_ext.rb', line 41

alias_method :orig_read, :read

#orig_write ⇒ Object 



49
 
# File 'lib/malloc_ext.rb', line 49

alias_method :orig_write, :write

#read(length) ⇒ Object 



43
44
45
46
47
 
# File 'lib/malloc_ext.rb', line 43

def read( length )
  raise "Only #{@size} bytes of memory left to read " +
    "(illegal attempt to read #{length} bytes)" if length > @size
  orig_read length
end

#write(string) ⇒ Object 



51
52
53
54
55
56
57
 
# File 'lib/malloc_ext.rb', line 51

def write( string )
  if string.bytesize > @size
    raise "Must not write more than #{@size} bytes of memory " +
      "(illegal attempt to write #{string.bytesize} bytes)"
  end
  orig_write string
end