On 3/29/19 12:13 PM, Peter J. Holzer wrote:
Obviously you need some way to describe the specific binary format you
want to parse - in other words, a grammar. The library could then use
the grammar to parse the input - either by interpreting it directly, or
by generating (Python) code from it. The latter has the advantage that
it has to be done only once, not every time you want to parse a file.
If that sounds familiar, it's what yacc does. Except that it does it for
text files, not binary files. I am not aware of any generic binary
parser generator for Python. I have read research papers about such
generators for (I think) C and Java, but I don't remember the names and
I'm not sure if the generators got beyond the proof of concept stage.
It's been a while since I've used those tools, but if you
create a lexer (the yylex() function) that can tokenize a
binary stream, then yacc won't know the difference.
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