blob: b25f7c873c191a32288c04c96126a4cbd2487f1a [file] [log] [blame]
Rich Lane9cfa1652013-10-01 21:24:04 -07001:: # Copyright 2013, Big Switch Networks, Inc.
2:: #
3:: # LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with
4:: # the following special exception:
5:: #
6:: # LOXI Exception
7:: #
8:: # As a special exception to the terms of the EPL, you may distribute libraries
9:: # generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided
10:: # that copyright and licensing notices generated by LoxiGen are not altered or removed
11:: # from the LoxiGen Libraries and the notice provided below is (i) included in
12:: # the LoxiGen Libraries, if distributed in source code form and (ii) included in any
13:: # documentation for the LoxiGen Libraries, if distributed in binary form.
14:: #
15:: # Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler."
16:: #
17:: # You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain
18:: # a copy of the EPL at:
19:: #
20:: # http://www.eclipse.org/legal/epl-v10.html
21:: #
22:: # Unless required by applicable law or agreed to in writing, software
23:: # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
24:: # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
25:: # EPL for the specific language governing permissions and limitations
26:: # under the EPL.
27::
Rich Lane872b95a2013-06-17 18:39:14 -070028OFReader = {}
29OFReader.new = function(buf, offset)
30 local self = {}
31 offset = offset or 0
32
33 self.read = function(len)
34 local r = buf(offset, len)
35 offset = offset + len
36 return r
37 end
38
39 self.read_all = function()
Rich Lane750bb5c2013-10-01 23:27:23 -070040 local r = buf(offset, buf:len() - offset)
41 offset = buf:len()
Rich Lane872b95a2013-06-17 18:39:14 -070042 return r
43 end
44
45 self.peek = function(off, len)
46 return buf(offset + off, len)
47 end
48
Rich Laned03d0152013-10-03 13:24:37 -070049 self.peek_all = function(off)
50 return buf(offset + off, buf:len() - offset - off)
51 end
52
Rich Lane872b95a2013-06-17 18:39:14 -070053 self.skip = function(len)
54 offset = offset + len
55 end
56
57 self.is_empty = function()
58 return offset == buf:len()
59 end
60
61 self.slice = function(len)
62 r = OFReader.new(buf(offset, len))
63 offset = offset + len
64 return r
65 end
66
67 return self
68end