[VOL-1349] EPON OLT adapter (package B)
Change-Id: I634ef62c53813dcf4456f54948f13e06358e263c
diff --git a/vendor/github.com/google/gopacket/layertype.go b/vendor/github.com/google/gopacket/layertype.go
new file mode 100644
index 0000000..3abfee1
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layertype.go
@@ -0,0 +1,111 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package gopacket
+
+import (
+ "fmt"
+ "strconv"
+)
+
+// LayerType is a unique identifier for each type of layer. This enumeration
+// does not match with any externally available numbering scheme... it's solely
+// usable/useful within this library as a means for requesting layer types
+// (see Packet.Layer) and determining which types of layers have been decoded.
+//
+// New LayerTypes may be created by calling gopacket.RegisterLayerType.
+type LayerType int64
+
+// LayerTypeMetadata contains metadata associated with each LayerType.
+type LayerTypeMetadata struct {
+ // Name is the string returned by each layer type's String method.
+ Name string
+ // Decoder is the decoder to use when the layer type is passed in as a
+ // Decoder.
+ Decoder Decoder
+}
+
+type layerTypeMetadata struct {
+ inUse bool
+ LayerTypeMetadata
+}
+
+// DecodersByLayerName maps layer names to decoders for those layers.
+// This allows users to specify decoders by name to a program and have that
+// program pick the correct decoder accordingly.
+var DecodersByLayerName = map[string]Decoder{}
+
+const maxLayerType = 2000
+
+var ltMeta [maxLayerType]layerTypeMetadata
+var ltMetaMap = map[LayerType]layerTypeMetadata{}
+
+// RegisterLayerType creates a new layer type and registers it globally.
+// The number passed in must be unique, or a runtime panic will occur. Numbers
+// 0-999 are reserved for the gopacket library. Numbers 1000-1999 should be
+// used for common application-specific types, and are very fast. Any other
+// number (negative or >= 2000) may be used for uncommon application-specific
+// types, and are somewhat slower (they require a map lookup over an array
+// index).
+func RegisterLayerType(num int, meta LayerTypeMetadata) LayerType {
+ if 0 <= num && num < maxLayerType {
+ if ltMeta[num].inUse {
+ panic("Layer type already exists")
+ }
+ } else {
+ if ltMetaMap[LayerType(num)].inUse {
+ panic("Layer type already exists")
+ }
+ }
+ return OverrideLayerType(num, meta)
+}
+
+// OverrideLayerType acts like RegisterLayerType, except that if the layer type
+// has already been registered, it overrides the metadata with the passed-in
+// metadata intead of panicing.
+func OverrideLayerType(num int, meta LayerTypeMetadata) LayerType {
+ if 0 <= num && num < maxLayerType {
+ ltMeta[num] = layerTypeMetadata{
+ inUse: true,
+ LayerTypeMetadata: meta,
+ }
+ } else {
+ ltMetaMap[LayerType(num)] = layerTypeMetadata{
+ inUse: true,
+ LayerTypeMetadata: meta,
+ }
+ }
+ DecodersByLayerName[meta.Name] = meta.Decoder
+ return LayerType(num)
+}
+
+// Decode decodes the given data using the decoder registered with the layer
+// type.
+func (t LayerType) Decode(data []byte, c PacketBuilder) error {
+ var d Decoder
+ if 0 <= int(t) && int(t) < maxLayerType {
+ d = ltMeta[int(t)].Decoder
+ } else {
+ d = ltMetaMap[t].Decoder
+ }
+ if d != nil {
+ return d.Decode(data, c)
+ }
+ return fmt.Errorf("Layer type %v has no associated decoder", t)
+}
+
+// String returns the string associated with this layer type.
+func (t LayerType) String() (s string) {
+ if 0 <= int(t) && int(t) < maxLayerType {
+ s = ltMeta[int(t)].Name
+ } else {
+ s = ltMetaMap[t].Name
+ }
+ if s == "" {
+ s = strconv.Itoa(int(t))
+ }
+ return
+}