Synalysis Q&A - Recent questions in Generic

How to process encoded offsets

Tue, 09 Jul 2024 14:14:13 +0000

I am currently greatly expanding the OpenType grammar. The CFF table uses a complex encoding scheme for number values in order to save space. Some of these encoded values represent offsets to other internal data structures. My questions: How can I either use regular offset elements and feed them decoded values, or how can I programmatically create and configure offset elements? They do not seem to be documented much at all. Thank you!

How can I re-analyze a file during script development?

Fri, 05 Jul 2024 19:35:02 +0000

I’m working on a custom data type in Synalyze It!. It seems that I have to close and re-open the file I want to analyze in order to apply the changes to the script. This makes development and debugging extremely slow. Is there a way to force re-analysis more easily?

Read structure another value within script

Wed, 13 Nov 2019 10:49:56 +0000

Hi,

I have a structure with name "TLLV", that splits on 2 substructures: "Header" and "Payload".

Payload has "Value" and "padding", that is very depends on the length of the "Value", specified in Header. And I want to calculate "padding" length in the custom datatype with writing the script:

   currentGrammar = currentMapper.getCurrentGrammar()
   headerStruct = currentGrammar.getStructureByName("TLLV_Header")
   offset = currentMapper.getCurrentOffset()
   bytesProcessed = currentMapper.mapStructureAtPosition(headerStruct, offset, 16)
   length = headerStruct.getElementByName("valueLength")

So, currently, I am able to reach out length, as an element.

But how to convert element to a "Number" type to be able to use it?