Class: MachO::Sections::Section

Inherits:
MachOStructure show all
Defined in:
lib/macho/sections.rb

Overview

Represents a section of a segment for 32-bit architectures.

Direct Known Subclasses

Section64

Constant Summary collapse

FORMAT =

See Also:

"a16a16L=9".freeze
SIZEOF =

See Also:

68

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from MachOStructure

bytesize, new_from_bin

Constructor Details

#initialize(sectname, segname, addr, size, offset, align, reloff, nreloc, flags, reserved1, reserved2) ⇒ Section

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Section.



113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/macho/sections.rb', line 113

def initialize(sectname, segname, addr, size, offset, align, reloff,
               nreloc, flags, reserved1, reserved2)
  @sectname = sectname
  @segname = segname
  @addr = addr
  @size = size
  @offset = offset
  @align = align
  @reloff = reloff
  @nreloc = nreloc
  @flags = flags
  @reserved1 = reserved1
  @reserved2 = reserved2
end

Instance Attribute Details

#addr ⇒ Integer (readonly)

Returns the memory address of the section.

Returns:

  • (Integer) —

    the memory address of the section



80
81
82
 
# File 'lib/macho/sections.rb', line 80

def addr
  @addr
end

#align ⇒ Integer (readonly)

Returns the section alignment (power of 2) of the section.

Returns:

  • (Integer) —

    the section alignment (power of 2) of the section



89
90
91
 
# File 'lib/macho/sections.rb', line 89

def align
  @align
end

#flags ⇒ Integer (readonly)

Returns flags for type and attributes of the section.

Returns:

  • (Integer) —

    flags for type and attributes of the section



98
99
100
 
# File 'lib/macho/sections.rb', line 98

def flags
  @flags
end

#nreloc ⇒ Integer (readonly)

Returns the number of relocation entries.

Returns:

  • (Integer) —

    the number of relocation entries



95
96
97
 
# File 'lib/macho/sections.rb', line 95

def nreloc
  @nreloc
end

#offset ⇒ Integer (readonly)

Returns the file offset of the section.

Returns:

  • (Integer) —

    the file offset of the section



86
87
88
 
# File 'lib/macho/sections.rb', line 86

def offset
  @offset
end

#reloff ⇒ Integer (readonly)

Returns the file offset of the section's relocation entries.

Returns:

  • (Integer) —

    the file offset of the section's relocation entries



92
93
94
 
# File 'lib/macho/sections.rb', line 92

def reloff
  @reloff
end

#reserved1 ⇒ void (readonly)

This method returns an undefined value.

Returns reserved (for offset or index).



101
102
103
 
# File 'lib/macho/sections.rb', line 101

def reserved1
  @reserved1
end

#reserved2 ⇒ void (readonly)

This method returns an undefined value.

Returns reserved (for count or sizeof).



104
105
106
 
# File 'lib/macho/sections.rb', line 104

def reserved2
  @reserved2
end

#sectname ⇒ String (readonly)

Returns the name of the section, including null pad bytes.

Returns:

  • (String) —

    the name of the section, including null pad bytes



73
74
75
 
# File 'lib/macho/sections.rb', line 73

def sectname
  @sectname
end

#segname ⇒ String (readonly)

Returns the name of the segment's section, including null pad bytes.

Returns:

  • (String) —

    the name of the segment's section, including null pad bytes



77
78
79
 
# File 'lib/macho/sections.rb', line 77

def segname
  @segname
end

#size ⇒ Integer (readonly)

Returns the size, in bytes, of the section.

Returns:

  • (Integer) —

    the size, in bytes, of the section



83
84
85
 
# File 'lib/macho/sections.rb', line 83

def size
  @size
end

Instance Method Details

#empty? ⇒ Boolean

Returns whether the section is empty (i.e, #size is 0).

Returns:

  • (Boolean) —

    whether the section is empty (i.e, #size is 0)



141
142
143
 
# File 'lib/macho/sections.rb', line 141

def empty?
  size.zero?
end

#flag?(flag) ⇒ Boolean

Returns whether the flag is present in the section's #flags.

Examples:

puts "this section is regular" if sect.flag?(:S_REGULAR)

Parameters:

  • flag (Symbol) —

    a section flag symbol

Returns:

  • (Boolean) —

    whether the flag is present in the section's #flags



149
150
151
152
153
 
# File 'lib/macho/sections.rb', line 149

def flag?(flag)
  flag = SECTION_FLAGS[flag]
  return false if flag.nil?
  flags & flag == flag
end

#section_name ⇒ String

Returns the section's name, with any trailing NULL characters removed.

Returns:

  • (String) —

    the section's name, with any trailing NULL characters removed



130
131
132
 
# File 'lib/macho/sections.rb', line 130

def section_name
  sectname.delete("\x00")
end

#segment_name ⇒ String

Returns the parent segment's name, with any trailing NULL characters removed.

Returns:

  • (String) —

    the parent segment's name, with any trailing NULL characters removed



136
137
138
 
# File 'lib/macho/sections.rb', line 136

def segment_name
  segname.delete("\x00")
end