diff options
Diffstat (limited to 'ruby/lib/dl/pack.rb')
| -rw-r--r-- | ruby/lib/dl/pack.rb | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/ruby/lib/dl/pack.rb b/ruby/lib/dl/pack.rb new file mode 100644 index 0000000..ad91833 --- /dev/null +++ b/ruby/lib/dl/pack.rb @@ -0,0 +1,173 @@ +require 'dl' + +module DL + module PackInfo + if( defined?(TYPE_LONG_LONG) ) + ALIGN_MAP = { + TYPE_VOIDP => ALIGN_VOIDP, + TYPE_CHAR => ALIGN_CHAR, + TYPE_SHORT => ALIGN_SHORT, + TYPE_INT => ALIGN_INT, + TYPE_LONG => ALIGN_LONG, + TYPE_LONG_LONG => ALIGN_LONG_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, + -TYPE_LONG_LONG => ALIGN_LONG_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_LONG_LONG => "q", + TYPE_FLOAT => "f", + TYPE_DOUBLE => "d", + -TYPE_CHAR => "c", + -TYPE_SHORT => "s!", + -TYPE_INT => "i!", + -TYPE_LONG => "l!", + -TYPE_LONG_LONG => "q", + } + + SIZE_MAP = { + TYPE_VOIDP => SIZEOF_VOIDP, + TYPE_CHAR => SIZEOF_CHAR, + TYPE_SHORT => SIZEOF_SHORT, + TYPE_INT => SIZEOF_INT, + TYPE_LONG => SIZEOF_LONG, + TYPE_LONG_LONG => SIZEOF_LONG_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, + -TYPE_LONG_LONG => SIZEOF_LONG_LONG, + } + else + 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, + } + end + + def align(addr, align) + d = addr % align + if( d == 0 ) + addr + else + addr + (align - d) + end + end + module_function :align + end + + class Packer + include PackInfo + + def Packer.[](*types) + Packer.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 + 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 |