hts 0.1.18

Rust binding for htslib
Documentation 
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use crate::hts_ffi::{BCF_BT_CHAR, BCF_BT_FLOAT, BCF_BT_INT16, BCF_BT_INT32, BCF_BT_INT8};
use crate::TypedValue;
use std::borrow::Cow;

impl<'a> TypedValue<'a> {
    pub fn try_get_string(&self) -> Option<Cow<str>> {
        if let Self::SStr(raw) = self {
            return Some(String::from_utf8_lossy(raw));
        }
        None
    }
    fn cast_and_pack<T: Sized + 'static, F: Fn(&'a [T]) -> TypedValue<'a>>(
        ptr: *const u8,
        size: usize,
        pack: F,
    ) -> TypedValue<'a> {
        let slice =
            unsafe { std::slice::from_raw_parts(ptr as *const T, size / std::mem::size_of::<T>()) };
        pack(slice)
    }
    pub(crate) fn from_type_and_raw_data(type_code: i32, ptr: *const u8, nbytes: u32) -> Self {
        use TypedValue::*;
        let nbytes = nbytes as usize;
        match type_code as u32 {
            BCF_BT_CHAR => Self::cast_and_pack::<u8, _>(ptr, nbytes, SStr),
            BCF_BT_FLOAT => Self::cast_and_pack(ptr, nbytes, F),
            BCF_BT_INT8 => Self::cast_and_pack(ptr, nbytes, I8),
            BCF_BT_INT16 => Self::cast_and_pack(ptr, nbytes, I16),
            BCF_BT_INT32 => Self::cast_and_pack(ptr, nbytes, I32),
            _ => Null,
        }
    }
}