On Thu, 16 Jun 2011, Troy Witthoeft wrote:
I'm no file decoder, but I did review about a dozen prts created with
different versions of the program, and different companies. The closest
thing I can find to a common header or sequence of bytes is the
occurrence of sextuple 3's and nine 0's just before text fields. Viewing
the file in Visual studio, a sample hex code header would be [33 33 33
33 33 33 E3 3F 00 00 00 00 00 00 00 00 00 01 1F 1B 00] which is
immediately followed by the hex code of the text, for instance [43 48 45
43 4B 45 44] is the text "CHECKED"
The header always stays the same except for variation in the three hexes
just before the text. That would be [1F 1B 00] from my example above.
So, there does seem to be a pattern here to work with.
What follows the text, anything that would obviously let you spot that it
has finished? And do the three bytes which vary have any relation to the
length of the text?
I'm just not sure which tools will help me manipulate this pattern.
Got any ideas?
If the files aren't too big, and the text is only every us-ascii, then you
could do it with a regexp...
More usually you'd just nibble through one byte at a time, with a
resettable state, and wait until you find the whole header then output the
text
Nick
