Add the beginnings of a Dart wrapper for libarchive.

utils/archive/read_request.dart

Index: utils/archive/read_request.dart
diff --git a/utils/archive/read_request.dart b/utils/archive/read_request.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0d6ce09cf7cc0dc92c24eff14470198756021b93
--- /dev/null
+++ b/utils/archive/read_request.dart
@@ -0,0 +1,37 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/**
+ * The request ids for read-related messages to send to the C extension.
+ */
+#library("read_request");
+
+final int NEW = 0;
+final int SUPPORT_FILTER_ALL = 1;
+final int SUPPORT_FILTER_BZIP2 = 2;
+final int SUPPORT_FILTER_COMPRESS = 3;
+final int SUPPORT_FILTER_GZIP = 4;
+final int SUPPORT_FILTER_LZMA = 5;
+final int SUPPORT_FILTER_XZ = 6;
+final int SUPPORT_FILTER_PROGRAM = 7;
+final int SUPPORT_FILTER_PROGRAM_SIGNATURE = 8;
+final int SUPPORT_FORMAT_ALL = 9;
+final int SUPPORT_FORMAT_AR = 10;
+final int SUPPORT_FORMAT_CPIO = 11;
+final int SUPPORT_FORMAT_EMPTY = 12;
+final int SUPPORT_FORMAT_ISO9599 = 13;
+final int SUPPORT_FORMAT_MTREE = 14;
+final int SUPPORT_FORMAT_RAW = 15;
+final int SUPPORT_FORMAT_TAR = 16;
+final int SUPPORT_FORMAT_ZIP = 17;
+final int SET_FILTER_OPTIONS = 18;
+final int SET_FORMAT_OPTIONS = 19;
+final int SET_OPTIONS = 20;
+final int OPEN_FILENAME = 21;
+final int OPEN_MEMORY = 22;
+final int NEXT_HEADER = 23;
+final int DATA_BLOCK = 24;
+final int DATA_SKIP = 25;
+final int CLOSE = 26;
+final int FREE = 27;