Function get_frame_content_size

pub fn get_frame_content_size(
    src: &[u8],
) -> Result<Option<u64>, ContentSizeError>

Wraps the ZSTD_getFrameContentSize() function.

Args:

• src: A prefix of the compressed frame. It should at least include the frame header.

Returns:

• Err(ContentSizeError) if src is too small of a prefix, or if it appears corrupted.
• Ok(None) if the frame does not include a content size.
• Ok(Some(content_size_in_bytes)) otherwise.