load-commands.rb

# Segment commands are one type of load command.

# Load commands all begin with the type of command it is, cmd,
# and the size of that command's struct in bytes.
class LoadCommand < CStruct
  uint32 :cmd
  uint32 :cmdsize
end

# Values for the cmd member of LoadCommand CStructs (incomplete).
LC_SEGMENT = 0x1
LC_SYMTAB = 0x2

class SegmentCommand < LoadCommand
  string :segname, 16
  uint32 :vmaddr
  uint32 :vmsize
  uint32 :fileoff
  uint32 :filesize
  int32 :maxprot
  int32 :initprot
  uint32 :nsects
  uint32 :flags
end


# Values for protection fields, maxprot and initprot (incomplete).
# (These are bitwise or'd together as in C.)
VM_PROT_NONE = 0x00
VM_PROT_READ = 0x01
VM_PROT_WRITE = 0x02
VM_PROT_EXECUTE = 0x04