Class: MachO::Headers::PrelinkedKernelHeader

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

Overview

Prelinked kernel/"kernelcache" header structure

Constant Summary collapse

FORMAT =

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

See Also:

"L>6a40a64a256"
SIZEOF =

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

See Also:

384

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from MachOStructure

bytesize, new_from_bin

Constructor Details

#initialize(signature, compress_type, adler32, uncompressed_size, compressed_size, prelink_version, reserved, platform_name, root_path) ⇒ PrelinkedKernelHeader

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 PrelinkedKernelHeader.



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# File 'lib/macho/headers.rb', line 853

def initialize(signature, compress_type, adler32, uncompressed_size, compressed_size, prelink_version, reserved, platform_name, root_path)
  super()

  @signature = signature
  @compress_type = compress_type
  @adler32 = adler32
  @uncompressed_size = uncompressed_size
  @compressed_size = compressed_size
  @prelink_version = prelink_version
  @reserved = reserved.unpack("L>10")
  @platform_name = platform_name
  @root_path = root_path
end

Instance Attribute Details

#adler32 ⇒ Integer (readonly)

Returns a checksum for the uncompressed data.

Returns:

  • (Integer) —

    a checksum for the uncompressed data



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# File 'lib/macho/headers.rb', line 824

def adler32
  @adler32
end

#compress_type ⇒ Integer (readonly)

Returns the type of compression used.

Returns:

  • (Integer) —

    the type of compression used



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# File 'lib/macho/headers.rb', line 821

def compress_type
  @compress_type
end

#compressed_size ⇒ Integer (readonly)

Returns the size of the compressed data, in bytes.

Returns:

  • (Integer) —

    the size of the compressed data, in bytes



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# File 'lib/macho/headers.rb', line 830

def compressed_size
  @compressed_size
end

#platform_name ⇒ void (readonly)

This method returns an undefined value.



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# File 'lib/macho/headers.rb', line 839

def platform_name
  @platform_name
end

#prelink_version ⇒ Integer (readonly)

Returns the version of the prelink format.

Returns:

  • (Integer) —

    the version of the prelink format



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# File 'lib/macho/headers.rb', line 833

def prelink_version
  @prelink_version
end

#reserved ⇒ void (readonly)

This method returns an undefined value.



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# File 'lib/macho/headers.rb', line 836

def reserved
  @reserved
end

#root_path ⇒ void (readonly)

This method returns an undefined value.



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# File 'lib/macho/headers.rb', line 842

def root_path
  @root_path
end

#signature ⇒ Integer (readonly)

Returns the magic number for a compressed header (COMPRESSED_MAGIC).

Returns:



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# File 'lib/macho/headers.rb', line 818

def signature
  @signature
end

#uncompressed_size ⇒ Integer (readonly)

Returns the size of the uncompressed data, in bytes.

Returns:

  • (Integer) —

    the size of the uncompressed data, in bytes



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# File 'lib/macho/headers.rb', line 827

def uncompressed_size
  @uncompressed_size
end

Instance Method Details

#kaslr? ⇒ Boolean

Returns whether this prelinked kernel supports KASLR.

Returns:

  • (Boolean) —

    whether this prelinked kernel supports KASLR



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# File 'lib/macho/headers.rb', line 868

def kaslr?
  prelink_version >= 1
end

#lzss? ⇒ Boolean

Returns whether this prelinked kernel is compressed with LZSS.

Returns:

  • (Boolean) —

    whether this prelinked kernel is compressed with LZSS



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# File 'lib/macho/headers.rb', line 873

def lzss?
  compress_type == COMP_TYPE_LZSS
end

#lzvn? ⇒ Boolean

Returns whether this prelinked kernel is compressed with LZVN.

Returns:

  • (Boolean) —

    whether this prelinked kernel is compressed with LZVN



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# File 'lib/macho/headers.rb', line 878

def lzvn?
  compress_type == COMP_TYPE_FASTLIB
end

#to_h ⇒ Hash

Returns a hash representation of this MachO::Headers::PrelinkedKernelHeader.

Returns:



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# File 'lib/macho/headers.rb', line 883

def to_h
  {
    "signature" => signature,
    "compress_type" => compress_type,
    "adler32" => adler32,
    "uncompressed_size" => uncompressed_size,
    "compressed_size" => compressed_size,
    "prelink_version" => prelink_version,
    "reserved" => reserved,
    "platform_name" => platform_name,
    "root_path" => root_path,
  }.merge super
end