/usr/lib/ruby/1.9.1/dl/struct.rb is in libruby1.9.1 1.9.3.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 | require 'dl'
require 'dl/pack.rb'
module DL
class CStruct
def CStruct.entity_class()
CStructEntity
end
end
class CUnion
def CUnion.entity_class()
CUnionEntity
end
end
module CStructBuilder
def create(klass, types, members)
new_class = Class.new(klass){
define_method(:initialize){|addr|
@entity = klass.entity_class.new(addr, types)
@entity.assign_names(members)
}
define_method(:to_ptr){ @entity }
define_method(:to_i){ @entity.to_i }
members.each{|name|
define_method(name){ @entity[name] }
define_method(name + "="){|val| @entity[name] = val }
}
}
size = klass.entity_class.size(types)
new_class.module_eval(<<-EOS, __FILE__, __LINE__+1)
def new_class.size()
#{size}
end
def new_class.malloc()
addr = DL.malloc(#{size})
new(addr)
end
EOS
return new_class
end
module_function :create
end
class CStructEntity < CPtr
include PackInfo
include ValueUtil
def CStructEntity.malloc(types, func = nil)
addr = DL.malloc(CStructEntity.size(types))
CStructEntity.new(addr, types, func)
end
def CStructEntity.size(types)
offset = 0
max_align = 0
types.each_with_index{|t,i|
orig_offset = offset
if( t.is_a?(Array) )
align = PackInfo::ALIGN_MAP[t[0]]
offset = PackInfo.align(orig_offset, align)
size = offset - orig_offset
offset += (PackInfo::SIZE_MAP[t[0]] * t[1])
else
align = PackInfo::ALIGN_MAP[t]
offset = PackInfo.align(orig_offset, align)
size = offset - orig_offset
offset += PackInfo::SIZE_MAP[t]
end
if (max_align < align)
max_align = align
end
}
offset = PackInfo.align(offset, max_align)
offset
end
def initialize(addr, types, func = nil)
set_ctypes(types)
super(addr, @size, func)
end
def assign_names(members)
@members = members
end
def set_ctypes(types)
@ctypes = types
@offset = []
offset = 0
max_align = 0
types.each_with_index{|t,i|
orig_offset = offset
if( t.is_a?(Array) )
align = ALIGN_MAP[t[0]]
else
align = ALIGN_MAP[t]
end
offset = PackInfo.align(orig_offset, align)
@offset[i] = offset
if( t.is_a?(Array) )
offset += (SIZE_MAP[t[0]] * t[1])
else
offset += SIZE_MAP[t]
end
if (max_align < align)
max_align = align
end
}
offset = PackInfo.align(offset, max_align)
@size = offset
end
def [](name)
idx = @members.index(name)
if( idx.nil? )
raise(ArgumentError, "no such member: #{name}")
end
ty = @ctypes[idx]
if( ty.is_a?(Array) )
r = super(@offset[idx], SIZE_MAP[ty[0]] * ty[1])
else
r = super(@offset[idx], SIZE_MAP[ty.abs])
end
packer = Packer.new([ty])
val = packer.unpack([r])
case ty
when Array
case ty[0]
when TYPE_VOIDP
val = val.collect{|v| CPtr.new(v)}
end
when TYPE_VOIDP
val = CPtr.new(val[0])
else
val = val[0]
end
if( ty.is_a?(Integer) && (ty < 0) )
return unsigned_value(val, ty)
elsif( ty.is_a?(Array) && (ty[0] < 0) )
return val.collect{|v| unsigned_value(v,ty[0])}
else
return val
end
end
def []=(name, val)
idx = @members.index(name)
if( idx.nil? )
raise(ArgumentError, "no such member: #{name}")
end
ty = @ctypes[idx]
packer = Packer.new([ty])
val = wrap_arg(val, ty, [])
buff = packer.pack([val].flatten())
super(@offset[idx], buff.size, buff)
if( ty.is_a?(Integer) && (ty < 0) )
return unsigned_value(val, ty)
elsif( ty.is_a?(Array) && (ty[0] < 0) )
return val.collect{|v| unsigned_value(v,ty[0])}
else
return val
end
end
def to_s()
super(@size)
end
end
class CUnionEntity < CStructEntity
include PackInfo
def CUnionEntity.malloc(types, func=nil)
addr = DL.malloc(CUnionEntity.size(types))
CUnionEntity.new(addr, types, func)
end
def CUnionEntity.size(types)
size = 0
types.each_with_index{|t,i|
if( t.is_a?(Array) )
tsize = PackInfo::SIZE_MAP[t[0]] * t[1]
else
tsize = PackInfo::SIZE_MAP[t]
end
if( tsize > size )
size = tsize
end
}
end
def set_ctypes(types)
@ctypes = types
@offset = []
@size = 0
types.each_with_index{|t,i|
@offset[i] = 0
if( t.is_a?(Array) )
size = SIZE_MAP[t[0]] * t[1]
else
size = SIZE_MAP[t]
end
if( size > @size )
@size = size
end
}
end
end
end
|