12-07-2009
Ascii characters are made up from one 8 bit byte. So a "|" (pipe symbol) is represented by a value of 179 decimal, or b3 hexadecimal.
What you have in your original string is 16 8-bit bytes. If you take these in pairs and multiply the first by 16 and add the second, you will end up with a value between 0 and 255, (b *16 +3 = 11 * 16 +3 = 179), which you can then store in a single 8 bit byte, resulting in a 50% reduction in storage.
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LEARN ABOUT DEBIAN
srec_tektronix
srec_tektronix(5) File Formats Manual srec_tektronix(5)
NAME
srec_tektronix - Tektronix hexadecimal file format
DESCRIPTION
The Tektronix hexadecimal file format is no longer very common. It serves a similar purpose to the Motorola and Intel formats, usually
used to transfer data into EPROM programmers.
The Lines
Most Tektronix hex files contain only Tektronix hex lines (see the next section), which always start with a slash ("/[rq]) character.
There are only two types of lines - data lines and a termination line.
Data Lines
Data lines have five fields: address, length, checksum 1, data and checksum 2. The lines always start with a slash ("/[rq]) character.
+--+---------+--------+-----------+------+-----------+
|/ | Address | Length | Checksum1 | Data | Checksum2 |
+--+---------+--------+-----------+------+-----------+
Address This is a 4 character (2 byte) address that specifies where the data in the record is to be loaded into memory.
Data Length
The data length field is a 2 character (1 byte) field that specifies the number of character pairs (bytes) in the data field. This
field never has a value of zero.
Checksum 1
The checksum 1 field is a 2 character (1 byte) field. Its value is the 8-bit sum of the six 4-bit values which make up the address
and length fields.
Data The data field contains character pairs (bytes); the number of character pairs (bytes) is indicated by the length field.
Checksum 2
The checksum 2 field is a 2 character (1 byte) field. Its value is the least significant byte of the sum of the all the 4-bit val-
ues of the data field.
Termination Line
Termination lines have three fields: address, zero and checksum. The lines always start with a slash ("/[rq]) character.
+--+---------+------+----------+
|/ | Address | Zero | Checksum |
+--+---------+------+----------+
Address This is a 4 character (2 byte) address that specifies where to begin execution.
Zero The data length field is a 2 character (1 byte) field of value zero.
Checksum
The checksum 1 field is a 2 character (1 byte) field. Its value is the 8-bit sum of the six 4-bit values which make up the address
and zero fields.
Size Multiplier
In general, binary data will expand in sized by approximately 2.4 times when represented with this format.
EXAMPLE
Here is an example Tektronix hex file. It contains the data "Hello, World[rq] to be loaded at address 0.
/00000D0D48656C6C6F2C20576F726C640A52
/00000000
COPYRIGHT
srec_cat version 1.58
Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Peter Miller
The srec_cat program comes with ABSOLUTELY NO WARRANTY; for details use the 'srec_cat -VERSion License' command. This is free software and
you are welcome to redistribute it under certain conditions; for details use the 'srec_cat -VERSion License' command.
AUTHOR
Peter Miller E-Mail: pmiller@opensource.org.au
//* WWW: http://miller.emu.id.au/pmiller/
Reference Manual SRecord srec_tektronix(5)