1 files changed, 40 insertions, 0 deletions
diff --git a/pack.rb b/pack.rb
new file mode 100644
index 0000000000..a8b9e74514
--- /dev/null
+++ b/pack.rb
@@ -0,0 +1,40 @@
+class Array
+  #  call-seq:
+  #    pack(template, buffer: nil) -> string
+  #
+  #  Formats each element in +self+ into a binary string; returns that string.
+  #  See {Packed Data}[rdoc-ref:language/packed_data.rdoc].
+  def pack(fmt, buffer: nil)
+    Primitive.pack_pack(fmt, buffer)
+  end
+end
+
+class String
+  #  call-seq:
+  #    unpack(template, offset: 0) {|o| .... } -> object
+  #    unpack(template, offset: 0) -> array
+  #
+  #  Extracts data from +self+ to form new objects;
+  #  see {Packed Data}[rdoc-ref:language/packed_data.rdoc].
+  #
+  #  With a block given, calls the block with each unpacked object.
+  #
+  #  With no block given, returns an array containing the unpacked objects.
+  #
+  #  Related: see {Converting to Non-String}[rdoc-ref:String@Converting+to+Non--5CString].
+  def unpack(fmt, offset: 0)
+    Primitive.attr! :use_block
+    Primitive.pack_unpack(fmt, offset)
+  end
+
+  # call-seq:
+  #   unpack1(template, offset: 0) -> object
+  #
+  #  Like String#unpack with no block, but unpacks and returns only the first extracted object.
+  #  See {Packed Data}[rdoc-ref:language/packed_data.rdoc].
+  #
+  #  Related: see {Converting to Non-String}[rdoc-ref:String@Converting+to+Non--5CString].
+  def unpack1(fmt, offset: 0)
+    Primitive.pack_unpack1(fmt, offset)
+  end
+end