Difference between revisions of "Packet Layout"
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** LL_ACK_FLAG 0x10 -- This packet contains appended acks. | ** LL_ACK_FLAG 0x10 -- This packet contains appended acks. | ||
* Bytes 0, (4 least significant bits) to byte 3: (for a total of 28 bit) Packet ID, assigned by circuit | * Bytes 0, (4 least significant bits) to byte 3: (for a total of 28 bit) Packet ID, assigned by circuit | ||
* Everything | * Everything up to ACKs is potentially zerocoded for compression | ||
* Bytes n thru n+(frequency size) | * Bytes n thru n+(frequency size) | ||
** 1/2/4 byte ID of the [[message]] the packet contains | ** 1/2/4 byte ID of the [[message]] the packet contains | ||
Revision as of 11:54, 9 January 2007
Packet Layout Visualization
+-+-+-+-+-------+---------------+---------------+---------------+ |Z|R|R|A| | |E|E|E|C| Packet ID (28 bits) | |R|L|S|K| | +-+-+-+-+-------+---------------+---------------+---------------+ | | : :
Header
- Byte 0, 4 most significant bits: Packet Information
- LL_ZERO_CODE_FLAG 0x80 -- Packet data is run length encoded, such that series of 1 to 255 zero bytes are encoded to take 2 bytes.
- LL_RELIABLE_FLAG 0x40 -- This packet was sent reliably (implies please ack this packet)
- LL_RESENT_FLAG 0x20 -- This packet is a resend from the source.
- LL_ACK_FLAG 0x10 -- This packet contains appended acks.
- Bytes 0, (4 least significant bits) to byte 3: (for a total of 28 bit) Packet ID, assigned by circuit
- Everything up to ACKs is potentially zerocoded for compression
- Bytes n thru n+(frequency size)
- 1/2/4 byte ID of the message the packet contains
For further explanation of the bits in the header, see Messages and Packet Accounting
Body
- Bytes n thru n+(data length)
- Body of packet
Appended Acks
- Bytes n+(data length) thru acks
- Rest of packet is filled with as many acks from previous reliable messages as will fit.
See also: libsecondlife documentation