Wireshark mailing list archives
Re: Help needed on value translation of dissected bits
From: Jaap Keuter <jaap.keuter () xs4all nl>
Date: Thu, 03 Dec 2009 23:56:52 +0100
Hi, Almost, but that put bit 8 in Byte 1 at the LSB for Value B, while it's supposed to be the MSB. This is a really weird encoding, not something supported by normal routines. Chris pointed you in the right direction how to present 'interpreted' data. Thanks, Jaap John Tapparo wrote:
Does defining it as { &hf_myproto_B, { "B Value", "myproto.b", FT_UINT16, BASE_DEC, NULL, 0xff80, NULL, HFILL } } And then using proto_tree_add_item(tree, hf_myproto_B, tvb, o, 2, TRUE); do what you want (basically telling it that the value is little_endian)? On Wednesday 02 December 2009 11:55:55 Jarolin, Robert wrote:Let me give an example: Assume that you have 2 bytes to dissect that are formatted as follows: - There are 2 values, A and B that are encoded into 2 Bytes - Value A has a maximum size of 127 and is encoded using the lower 7 bits of Byte 1 - Value B has a maximum size of 511 and is encoded using all 8 bits in Byte 2 along with bit 8 in Byte 1 representing the MSB for Value B Normally, I would define the dissection in the hf structure as follows: { &hf_myproto_B, { "B Value", "myproto.b", FT_UINT16, BASE_DEC, NULL, 0x80ff, NULL, HFILL } }
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Current thread:
- Help needed on value translation of dissected bits Jarolin, Robert (Dec 03)
- Re: Help needed on value translation of dissected bits Maynard, Chris (Dec 03)
- Re: Help needed on value translation of dissected bits John Tapparo (Dec 03)
- Re: Help needed on value translation of dissected bits Jaap Keuter (Dec 03)