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require 'fiddle'
module Fiddle
module PackInfo # :nodoc: all
ALIGN_MAP = {
TYPE_VOIDP => ALIGN_VOIDP,
TYPE_CHAR => ALIGN_CHAR,
TYPE_SHORT => ALIGN_SHORT,
TYPE_INT => ALIGN_INT,
TYPE_LONG => ALIGN_LONG,
TYPE_FLOAT => ALIGN_FLOAT,
TYPE_DOUBLE => ALIGN_DOUBLE,
-TYPE_CHAR => ALIGN_CHAR,
-TYPE_SHORT => ALIGN_SHORT,
-TYPE_INT => ALIGN_INT,
-TYPE_LONG => ALIGN_LONG,
}
PACK_MAP = {
TYPE_VOIDP => ((SIZEOF_VOIDP == SIZEOF_LONG_LONG) ? "q" : "l!"),
TYPE_CHAR => "c",
TYPE_SHORT => "s!",
TYPE_INT => "i!",
TYPE_LONG => "l!",
TYPE_FLOAT => "f",
TYPE_DOUBLE => "d",
-TYPE_CHAR => "c",
-TYPE_SHORT => "s!",
-TYPE_INT => "i!",
-TYPE_LONG => "l!",
}
SIZE_MAP = {
TYPE_VOIDP => SIZEOF_VOIDP,
TYPE_CHAR => SIZEOF_CHAR,
TYPE_SHORT => SIZEOF_SHORT,
TYPE_INT => SIZEOF_INT,
TYPE_LONG => SIZEOF_LONG,
TYPE_FLOAT => SIZEOF_FLOAT,
TYPE_DOUBLE => SIZEOF_DOUBLE,
-TYPE_CHAR => SIZEOF_CHAR,
-TYPE_SHORT => SIZEOF_SHORT,
-TYPE_INT => SIZEOF_INT,
-TYPE_LONG => SIZEOF_LONG,
}
if defined?(TYPE_LONG_LONG)
ALIGN_MAP[TYPE_LONG_LONG] = ALIGN_MAP[-TYPE_LONG_LONG] = ALIGN_LONG_LONG
PACK_MAP[TYPE_LONG_LONG] = PACK_MAP[-TYPE_LONG_LONG] = "q"
SIZE_MAP[TYPE_LONG_LONG] = SIZE_MAP[-TYPE_LONG_LONG] = SIZEOF_LONG_LONG
end
def align(addr, align)
d = addr % align
if( d == 0 )
addr
else
addr + (align - d)
end
end
module_function :align
end
class Packer # :nodoc: all
include PackInfo
def self.[](*types)
new(types)
end
def initialize(types)
parse_types(types)
end
def size()
@size
end
def pack(ary)
case SIZEOF_VOIDP
when SIZEOF_LONG
ary.pack(@template)
when SIZEOF_LONG_LONG
ary.pack(@template)
else
raise(RuntimeError, "sizeof(void*)?")
end
end
def unpack(ary)
case SIZEOF_VOIDP
when SIZEOF_LONG
ary.join().unpack(@template)
when SIZEOF_LONG_LONG
ary.join().unpack(@template)
else
raise(RuntimeError, "sizeof(void*)?")
end
end
private
def parse_types(types)
@template = ""
addr = 0
types.each{|t|
orig_addr = addr
if( t.is_a?(Array) )
addr = align(orig_addr, ALIGN_MAP[TYPE_VOIDP])
else
addr = align(orig_addr, ALIGN_MAP[t])
end
d = addr - orig_addr
if( d > 0 )
@template << "x#{d}"
end
if( t.is_a?(Array) )
@template << (PACK_MAP[t[0]] * t[1])
addr += (SIZE_MAP[t[0]] * t[1])
else
@template << PACK_MAP[t]
addr += SIZE_MAP[t]
end
}
addr = align(addr, ALIGN_MAP[TYPE_VOIDP])
@size = addr
end
end
end