Function `ZSTD_getDictID_fromFrame`

pub unsafe extern "C" fn ZSTD_getDictID_fromFrame(src: *const c_void, srcSize: usize) -> c_uint

ZSTD_getDictID_fromFrame() : Requires v1.4.0+ Provides the dictID required to decompressed the frame stored within src. If @return == 0, the dictID could not be decoded. This could for one of the following reasons :

The frame does not require a dictionary to be decoded (most common case).
The frame was built with dictID intentionally removed. Whatever dictionary is necessary is a hidden piece of information. Note : this use case also happens when using a non-conformant dictionary.
srcSize is too small, and as a result, the frame header could not be decoded (only possible if srcSize < ZSTD_FRAMEHEADERSIZE_MAX).
This is not a Zstandard frame. When identifying the exact failure cause, it's possible to use ZSTD_getFrameHeader(), which will provide a more precise error code.