topic Re: How to use scripts to extract binary files with byte offset and reserved bytes into decimal data? in Discussions

How to use scripts to extract binary files with byte offset and reserved bytes into decimal data?

lala — Fri, 09 Jun 2023 17:05:02 GMT

The document is divided into three parts:
A: The first eight bytes are the header (two integers of 4+4),

B: This is followed by 240 lines of uniform specifications.
The data structure for each row is as follows:
1. Two bytes are integers.
2. Four bytes are floating point.
3. Four bytes are floating point.
4. Two bytes are integers.
5. The remaining 14 bytes are reserved.

C: The last is the reserved null value.
How to restore this data to decimal data using JSL.

Thanks!

Re: How to use scripts to extract binary files with byte offset and reserved bytes into decimal data?

lala — Thu, 21 Jul 2022 13:52:26 GMT

This is how I try to identify the individual data structures for each row.

Re: How to use scripts to extract binary files with byte offset and reserved bytes into decimal data?

Craige_Hales — Thu, 21 Jul 2022 14:51:08 GMT

Load the data as a blob.

Use blobPeek(), similar to substr() for strings, but zero based, to pick out the segments.

Use blobToMatrix() to convert the segments to numbers.

blobToMatrix() can make 4- or 8-byte floats, 1-, 2-, 4-, and 8-byte signed or unsigned integers.

blobToMatrix also understands big vs little endian data: the least significant and most significant bits are sometimes swapped around. Most modern computes use little-endian representations.

Re: How to use scripts to extract binary files with byte offset and reserved bytes into decimal data?

lala — Fri, 22 Jul 2022 00:13:15 GMT

Thank Craige!