How to read file in bytes to different types vec

1

In my situation, the data is saved in a file
first 4 bytes gives the length of array
second 4 bytes gives the type of variable in the array, like 0 means i8, 1 means i16
next the dataset in given type, for example f32

The usage looks like
let mut f = File::open(file_dir).expect("File not found!");
let data = read_data(f);

I tried to find a function to read file like this, but failed.
And I tried to combine match and something like slice::from_raw_parts_mut to get it.
But still, I can do nothing to get a function that can read such file to a vector in different types.

Can anybody show me a function to solve the problem.
Thank you very much.

2

The types need to be known at compile time, so you’ll need define something like an enum to unify the different types you might read and then return a vector of those enums.

On mobile, so I can’t give a more complete explanation right now.

3

My friend, check out deku.
For folks who struggle with serde and nom**, it's like a breath of fresh air.

** use cases where nom / serde can be replaced.

4

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