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Added little endian support #1

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Added little endian support #1

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2e1e787
Added little endian decoding of length prefix
Jul 27, 2017
58715a2
Removed debug code
Jul 27, 2017
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13 changes: 10 additions & 3 deletions lppb.lua
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Original file line number Diff line number Diff line change
@@ -1,15 +1,22 @@
local lppb = Proto("lppb","Length Prefixed Protocol Buffers");

len_F = ProtoField.string("lppb.len","Length")
lppb.fields = {len_F}

lppb.prefs.port = Pref.uint("TCP Port:", 0, "")
lppb.prefs.schema = Pref.string("Schema:", "", "E.g. MY.PROTOBUF.MESSAGE")
lppb.prefs.prefix_size = Pref.uint("Prefix size (bytes):", 4, "")
lppb.prefs.prefix_endianess = Pref.bool("Little Endian ?", true, "Check this to decode the length prefix as if it were encoded as Little Endian")

function get_message_len(tvb, pinfo, tree)
local len = tvb:range(0, lppb.prefs.prefix_size):uint()
return len + lppb.prefs.prefix_size
local length_buf = tvb:range(0, lppb.prefs.prefix_size)
local len = 0
if lppb.prefs.prefix_endianess then
len = Struct.unpack('<I', length_buf:string())
else
len = length_buf:uint()
end
local result = len + lppb.prefs.prefix_size
return result
end

function dissect_message(tvb, pinfo, tree)
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