APPENDIX A: Reference Tables

Search in book...
Toggle Font Controls
Create new playlist

Name your new playlist

Playlist description (optional)
Sign In

Email address

Password

Forgot Password?

or

Continue with Facebook

Continue with Google
Sign Up

Full Name

Email address

Confirm Email Address

Password

or

Continue with Facebook

Continue with Google

A P P E N D I X A

Reference Tables

This appendix contains tables that provide valuable information for developers working with packetC. These tables include information concerning:

Keywords
ASCII table
Bits and bytes review
The TCP/IP and OSI model network stack
Internet and Ethernet header formats

Keywords

The keywords listed within the Reference Tables below are all reserved words within packetC and shall not be redefined by a developer.

Unit Keywords

packet library shared module main

Declaration Keywords

entry extern byte short int long void struct union bits pad enum typedef buffer const egex string reference descriptor record database db searchset set

Pragma Keywords

pragma control datatype export regex1

Expression Keywords

sizeof offset packet_offset end

Method Keywords

match find delete insert replicate requeue

Statement Keywords

at if else while do exit for goto return continue switch case default break try throw catch lock unlock alert log ref deref

packetC Pre-Defined Keywords

true false pib pkt sys $PACKET $SYS $PIB SearchResult NULL_STOP NULL_REGEX ERR_DB_FULL ERR_DB_READ ERR_DB_NOMATCH ERR_LAST_DEFINED ERR_PKT_INSERT ERR_PKT_DELETE ERR_PKT_NOREPLICATE ERR_SET_NOMATCH ERR_SET_NOPERFORM ERR_SET_NOTFOUND ERR_PKT_NOTREQUEUED

ASCII Table with Decimal to Hexadecimal Conversion

Characters may appear differently in hex editors and packet analysis systems for characters outside of the printable standard alphanumeric sequences.

Bits and Bytes

The following section contains quick references regarding the sizes and values of packetC unsigned numbers. In the diagram, MSB is the most significant bit and LSB is the least significant bit in Big-Endian byte-allocation order systems such as packetC. Note that packetC also follows a Little-Endian bit-allocation order.

8 Bits per Byte
2 Bytes per Short
2 Shorts per Int
2 Ints per Long
Byte = 8 Bits
Short = 16 Bits
Int = 32 Bits
Long = 64 Bits
Byte Maximum Value 255
Short Maximum Value 65,535
Int Maximum Value 4,294,967,295
Long Maximum Value 18,446,744,073,709,551,615

TCP/IP and OSI Model Network Stack

The OSI model divides layers of the stack into strictly-separated roles and protocols. The TCP/IP model continues with the enveloping of protocols within one another but not necessarily defining their roles in such a strict manner with regard to transport and network layers versus application layers. In packetC, layers follow a physical construction model of representation. If a protocol follows a full Layer 3 IP Header, then that protocol is treated as a Layer 4 protocol whether or not it may be called that in the TCP/IP model. A simple reference view of this schema is shown below.

Header Formats

The following network protocols are provided for reference and have supporting descriptors defined in protocols.ph (see Chapter 25 for Standard Networking Descriptors). The following diagrams call out byte and bit positions matching the packetC big-endian byte order and little-endian bit order representation of packet fields when accessed directly or via descriptors.