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Diffstat (limited to 'vendor/github.com/google/gopacket/layertype.go')
-rw-r--r-- | vendor/github.com/google/gopacket/layertype.go | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/vendor/github.com/google/gopacket/layertype.go b/vendor/github.com/google/gopacket/layertype.go deleted file mode 100644 index 3abfee1..0000000 --- a/vendor/github.com/google/gopacket/layertype.go +++ /dev/null @@ -1,111 +0,0 @@ -// 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 -} |