Decoding 'Content-Type'

Decoding 'Content-Type' SearchSearch
Author Message
Anonymous
 
Posted on Friday, November 28, 2003 - 09:49 am:   

Hi,
I am trying to decode the following fragment of PDU.

84 1F 28 B3 89 61 70 70 6C 69 63 61 74 69 6F 6E 2F 73 6D 69 6C 00 8A 3C 70 72 65 73 65 6E 74 61 74 69 6F 6E 2D 70 61 72 74 3E 00

I understand the above PDU as under:
84 - Content-Type
1F - ????
28 - Size in bytes
B3 - application/vnd.wap.multipart.related
89 - Type
61 70 70 6C 69 63 61 74 69 6F 6E 2F 73 6D 69 6C 00 - application/smil
8A - Start
3C 70 72 65 73 65 6E 74 61 74 69 6F 6E 2D 70 61 72 74 3E 00 - <presentation-part>

I don't know what '1F' stands for? Can anybody help me? Thanks in Advance.
Regards,
Kris
Fabricio
New member
Username: Fabri

Post Number: 3
Registered: 11-2003
Posted on Friday, November 28, 2003 - 03:43 pm:   

You should check the link:
http://www.wapforum.org/wina/wsp-content-type.htm

The 1F stands for Image/tiff
yanxh
New member
Username: Yanxh

Post Number: 5
Registered: 11-2003
Posted on Monday, December 01, 2003 - 01:29 am:   

1F is Length Quote.
please look here:
http://support.nowsms.com/discus/messages/12/470.html
Bryce Norwood - NowSMS Support
Board Administrator
Username: Bryce

Post Number: 1274
Registered: 10-2002
Posted on Monday, December 01, 2003 - 08:43 am:   

Actually 1F in this case is a "length-quote". See sections 8.4.1.2 and 8.4.2.2 of the WSP specification.

When a "value-length" is larger than 30 (0x1E) bytes, the field is encoded with a length-quote followed by a uintvar with the actual length.
Fabricio
New member
Username: Fabri

Post Number: 5
Registered: 11-2003
Posted on Wednesday, December 03, 2003 - 07:25 pm:   

You are completely right. Sorry for the bad information.
pentagra
Unregistered guest
Posted on Thursday, February 19, 2004 - 11:50 am:   

Hello !

89 - Type
61 70 70 6C 69 63 61 74 69 6F 6E 2F 73 6D 69 6C 00 - application/smil
8A - Start
3C 70 72 65 73 65 6E 74 61 74 69 6F 6E 2D 70 61 72 74 3E 00 - <presentation-part>

Could You please tell me, where described that 8a - Start, and 89 - Start Type ?
I understood it from dumps, but can not find in specifications.
yanxh
New member
Username: Yanxh

Post Number: 19
Registered: 11-2003
Posted on Friday, February 20, 2004 - 02:09 am:   

8a is equal 0a|0x80 and 89 is equal to 09 | 80.
please refer wap-230-wsp Table38 about Well-known parameter Assignments.