# IDX Parser

IDX data file parser written in Rust.

> ## THE IDX FILE FORMAT
>
> the IDX file format is a simple format for vectors and multidimensional matrices of various numerical types.
>
> ### The basic format is
>
> ```
> magic number
> size in dimension 0
> size in dimension 1
> size in dimension 2
> .....
> size in dimension N
> data
> ```
>
> The magic number is an integer (MSB first). The first 2 bytes are always 0.
>
> The third byte codes the type of the data:
>
> ```
> 0x08: unsigned byte
> 0x09: signed byte
> 0x0B: short (2 bytes)
> 0x0C: int (4 bytes)
> 0x0D: float (4 bytes)
> 0x0E: double (8 bytes)
> ```
>
> The 4-th byte codes the number of dimensions of the vector/matrix: 1 for vectors, 2 for matrices....
>
> The sizes in each dimension are 4-byte integers (MSB first, high endian, like in most non-Intel processors).
>
> The data is stored like in a C array, i.e. the index in the last dimension changes the fastest.

(taken from http://yann.lecun.com/exdb/mnist/ )