From d464704f111d211c1f1ff9ef23ef1d755054be00 Mon Sep 17 00:00:00 2001
From: shyouhei <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 15 Aug 2007 19:08:43 +0000
Subject: add tag v1_8_5_54

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_8_5_54@12952 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ruby_1_8_5/ext/dl/lib/dl/struct.rb | 149 +++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 ruby_1_8_5/ext/dl/lib/dl/struct.rb

(limited to 'ruby_1_8_5/ext/dl/lib/dl/struct.rb')

diff --git a/ruby_1_8_5/ext/dl/lib/dl/struct.rb b/ruby_1_8_5/ext/dl/lib/dl/struct.rb
new file mode 100644
index 0000000000..33f303fe22
--- /dev/null
+++ b/ruby_1_8_5/ext/dl/lib/dl/struct.rb
@@ -0,0 +1,149 @@
+# -*- ruby -*-
+
+require 'dl'
+require 'dl/import'
+
+module DL
+  module Importable
+    module Internal
+      def define_struct(contents)
+	init_types()
+	Struct.new(@types, contents)
+      end
+      alias struct define_struct
+
+      def define_union(contents)
+	init_types()
+	Union.new(@types, contents)
+      end
+      alias union define_union
+
+      class Memory
+	def initialize(ptr, names, ty, len, enc, dec)
+	  @ptr = ptr
+	  @names = names
+	  @ty    = ty
+	  @len   = len
+	  @enc   = enc
+	  @dec   = dec
+
+	  # define methods
+	  @names.each{|name|
+	    instance_eval [
+	      "def #{name}",
+	      "  v = @ptr[\"#{name}\"]",
+	      "  if( @len[\"#{name}\"] )",
+	      "    v = v.collect{|x| @dec[\"#{name}\"] ? @dec[\"#{name}\"].call(x) : x }",
+              "  else",
+	      "    v = @dec[\"#{name}\"].call(v) if @dec[\"#{name}\"]",
+	      "  end",
+	      "  return v",
+	      "end",
+	      "def #{name}=(v)",
+	      "  if( @len[\"#{name}\"] )",
+	      "    v = v.collect{|x| @enc[\"#{name}\"] ? @enc[\"#{name}\"].call(x) : x }",
+	      "  else",
+	      "    v = @enc[\"#{name}\"].call(v) if @enc[\"#{name}\"]",
+              "  end",
+	      "  @ptr[\"#{name}\"] = v",
+	      "  return v",
+	      "end",
+	    ].join("\n")
+	  }
+	end
+
+	def to_ptr
+	  return @ptr
+	end
+
+	def size
+	  return @ptr.size
+	end
+      end
+
+      class Struct
+	def initialize(types, contents)
+	  @names = []
+	  @ty   = {}
+	  @len  = {}
+	  @enc  = {}
+	  @dec  = {}
+	  @size = 0
+	  @tys  = ""
+	  @types = types
+	  parse(contents)
+	end
+
+	def size
+	  return @size
+	end
+
+	def members
+	  return @names
+	end
+
+	# ptr must be a PtrData object.
+	def new(ptr)
+	  ptr.struct!(@tys, *@names)
+	  mem = Memory.new(ptr, @names, @ty, @len, @enc, @dec)
+	  return mem
+	end
+
+	def malloc(size = nil)
+	  if( !size )
+	    size = @size
+	  end
+	  ptr = DL::malloc(size)
+	  return new(ptr)
+	end
+
+	def parse(contents)
+	  contents.each{|elem|
+	    name,ty,num,enc,dec = parse_elem(elem)
+	    @names.push(name)
+	    @ty[name]  = ty
+	    @len[name] = num
+	    @enc[name] = enc
+	    @dec[name] = dec
+	    if( num )
+	      @tys += "#{ty}#{num}"
+	    else
+	      @tys += ty
+	    end
+	  }
+	  @size = DL.sizeof(@tys)
+	end
+	
+	def parse_elem(elem)
+	  elem.strip!
+	  case elem
+	  when /^([\w\d_\*]+)([\*\s]+)([\w\d_]+)$/
+	    ty = ($1 + $2).strip
+	    name = $3
+	    num = nil;
+	  when /^([\w\d_\*]+)([\*\s]+)([\w\d_]+)\[(\d+)\]$/
+	    ty = ($1 + $2).strip
+	    name = $3
+	    num = $4.to_i
+	  else
+	    raise(RuntimeError, "invalid element: #{elem}")
+	  end
+	  ty,enc,dec = @types.encode_struct_type(ty)
+          if( !ty )
+            raise(TypeError, "unsupported type: #{ty}")
+          end
+	  return [name,ty,num,enc,dec]
+	end
+      end  # class Struct
+      
+      class Union < Struct
+	def new
+	  ptr = DL::malloc(@size)
+	  ptr.union!(@tys, *@names)
+	  mem = Memory.new(ptr, @names, @ty, @len, @enc, @dec)
+	  return mem
+	end
+      end
+    end  # module Internal
+  end  # module Importable
+end  # module DL
-- 
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