topic Re: How to use JSL to split a contiguous binary file into segments in bytes? in Discussions

How to use JSL to split a contiguous binary file into segments in bytes?

lala — Thu, 08 Jun 2023 16:36:50 GMT

This is what happens after reading binary files with JSL:

It's segmented by 12 bytes


b = Load Text File( "……\abc.spr", blob() );

Thanks Experts!

Re: How to use JSL to split a contiguous binary file into segments in bytes?

jthi — Sun, 12 Feb 2023 13:37:09 GMT

I would guess using Blob Peek and loop should work. There might also be additional ideas in

Re: How to use JSL to split a contiguous binary file into segments in bytes?

lala — Sun, 12 Feb 2023 13:52:01 GMT

Thank you for your help! "Blob Peek" is a method I learned about in the last question. Is there a more efficient way? For example regular？

Re: How to use JSL to split a contiguous binary file into segments in bytes?

lala — Sun, 12 Feb 2023 14:02:24 GMT

For example, regular substitution with EmEditor is easy to implement

Re: How to use JSL to split a contiguous binary file into segments in bytes?

Craige_Hales — Sun, 12 Feb 2023 17:26:27 GMT

There are only two choices. BlobPeek() and LoadTextfile(... , BLOB( ReadOffsetFromBegin(), ReadLength() ) ).

Using BlobPeek multiple times is faster than calling LoadTextfile multiple times.

What efficiency concern do you have? How big is the blob? How slow is it?

Re: How to use JSL to split a contiguous binary file into segments in bytes?

lala — Mon, 13 Feb 2023 07:47:00 GMT

Thanks!

Well, it looks like it can only be done in a circular way.
There are many such files that need to be written to the JMP table.
Want to increase speed.
I wrote JSL

b = Load Text File( ……|| "abs.spr", blob() );
s = Length( b ) / 12;
ar = [];
ar = J( s, 5, . );
For( k = 1, k <= s, k++,
	a = Blob Peek( b, (k - 1) * 12, 12 );
	ar[k, 3] = Blob To Matrix( a, "int", 4, "little", 8 )[1, 1];
	ar[k, 4] = Blob To Matrix( a, "int", 4, "little", 8 )[1, 2];
	ar[k, 5] = Blob To Matrix( a, "float", 4, "little", 8 )[1, 3];
);

If it is able to implement segmentation
Does this code increase speed?

Re: How to use JSL to split a contiguous binary file into segments in bytes?

lala — Mon, 13 Feb 2023 07:56:00 GMT

If the binary can be segmented after reading, can the following JSL be used?

Read the whole b directly, without looping:

	ar[0, 3] = Blob To Matrix( b, "int", 4, "little", 8 )[0, 1];
	ar[0, 4] = Blob To Matrix( b, "int", 4, "little", 8 )[0, 2];
	ar[0, 5] = Blob To Matrix( b, "float", 4, "little", 8 )[0, 3];

Thanks!