dh 0.10.0

Data handling in Rust, made easy.
Documentation 
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use dh::{Endianess, ReadVal, Result};
use std::io::{Cursor, Read};

#[test]
fn read_borrowing() {
    let data = [0u8, 1, 2, 3];
    let mut cursor = Cursor::new(data);

    // this just needs to compile
    let mut borrowed: &mut dyn Read = &mut cursor;
    assert_eq!(borrowed.read_u8().unwrap(), 0);
    assert_eq!(borrowed.read_u8().unwrap(), 1);
    assert_eq!(cursor.read_u8().unwrap(), 2);
    assert_eq!(cursor.read_u8().unwrap(), 3);
}

#[test]
fn read_primitive() {
    let data = [0u8, 1, 2, 3, 4, 5, 6, 7];
    let mut cursor = Cursor::new(data);

    let val: u8 = cursor.read_ne().unwrap();
    assert_eq!(val, 0);

    let val: [u8; 3] = cursor.read_ne().unwrap();
    assert_eq!(val, [1, 2, 3]);

    let val: u16 = cursor.read_be().unwrap();
    assert_eq!(val, 0x04_05);

    let val: u16 = cursor.read_le().unwrap();
    assert_eq!(val, 0x07_06);

    // overflow
    let val: Result<u8> = cursor.read_ne();
    assert!(val.is_err());
}

#[test]
#[cfg(feature = "vli")]
fn read_vu8() {
    let data = [0xff, 0xff, 0x7f, 0xff];
    let mut cursor = Cursor::new(data);

    let val = cursor.read_vu8().unwrap();
    assert_eq!(val, 0x7f << 14 | 0x7f << 7 | 0xff);
}

#[test]
#[cfg(feature = "vli")]
fn read_vu16_le() {
    let data = [0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff];
    let mut cursor = Cursor::new(data);

    let val = cursor.read_vu16_le().unwrap();
    assert_eq!(val, 0x7fff << 30 | 0x7fff << 15 | 0xffff);
}

#[test]
#[cfg(feature = "vli")]
fn read_vu16_be() {
    let data = [0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff];
    let mut cursor = Cursor::new(data);

    let val = cursor.read_vu16_be().unwrap();
    assert_eq!(val, 0x7fff << 30 | 0x7fff << 15 | 0xffff);
}

#[test]
#[cfg(feature = "vli")]
fn read_vu32_le() {
    let data = [
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff,
        0xff,
    ];
    let mut cursor = Cursor::new(data);

    let val = cursor.read_vu32_le().unwrap();
    assert_eq!(val, 0x7fffffff << 62 | 0x7fffffff << 31 | 0xffffffff);
}

#[test]
#[cfg(feature = "vli")]
fn read_vu32_be() {
    let data = [
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        0xff,
    ];
    let mut cursor = Cursor::new(data);

    let val = cursor.read_vu32_be().unwrap();
    assert_eq!(val, 0x7fffffff << 62 | 0x7fffffff << 31 | 0xffffffff);
}

#[test]
#[cfg(feature = "vli")]
fn read_vu64_le() {
    let data = [
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
    ];
    let mut cursor = Cursor::new(data);

    let val = cursor.read_vu64_le().unwrap();
    assert_eq!(val, 0x7fffffffffffffff << 63 | 0xffffffffffffffff);
}

#[test]
#[cfg(feature = "vli")]
fn read_vu64_be() {
    let data = [
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
    ];
    let mut cursor = Cursor::new(data);

    let val = cursor.read_vu64_be().unwrap();
    assert_eq!(val, 0x7fffffffffffffff << 63 | 0xffffffffffffffff);
}

// vu128 will work too as they are theoretically the same, but testing them would break the 128 bit limit.
// DON'T USE VU128, IT'S JUST FOR COMPLETENESS SAKE. THERE IS NO PRACTICAL USE CASE FOR IT.

#[test]
fn read_u8() {
    let data = [0u8, 1, 2, 3];
    let mut cursor = Cursor::new(data);

    assert_eq!(cursor.read_u8().unwrap(), 0);
    assert_eq!(cursor.read_u8().unwrap(), 1);
    assert_eq!(cursor.read_u8().unwrap(), 2);
    assert_eq!(cursor.read_u8().unwrap(), 3);

    // overflow
    let val = cursor.read_u8();
    assert!(val.is_err());
}

#[test]
fn read_u16_ne() {
    let data = [0x12u8, 0x34, 0x56, 0x78];
    let mut cursor = Cursor::new(data);

    let parts = match cfg!(target_endian = "big") {
        true => (0x1234, 0x5678),
        false => (0x3412, 0x7856),
    };

    assert_eq!(cursor.read_u16_ne().unwrap(), parts.0);
    assert_eq!(cursor.read_u16_ne().unwrap(), parts.1);

    // overflow
    let val = cursor.read_u16_ne();
    assert!(val.is_err());
}

#[test]
fn read_u16_le() {
    let data = [0x12u8, 0x34, 0x56, 0x78];
    let mut cursor = Cursor::new(data);

    assert_eq!(cursor.read_u16(Endianess::Little).unwrap(), 0x3412);
    assert_eq!(cursor.read_u16(Endianess::Little).unwrap(), 0x7856);

    // overflow
    let val = cursor.read_u16(Endianess::Little);
    assert!(val.is_err());
}

#[test]
fn read_u16_be() {
    let data = [0x12u8, 0x34, 0x56, 0x78];
    let mut cursor = Cursor::new(data);

    assert_eq!(cursor.read_u16_be().unwrap(), 0x1234);
    assert_eq!(cursor.read_u16_be().unwrap(), 0x5678);

    // overflow
    let val = cursor.read_u16_be();
    assert!(val.is_err());
}

#[test]
fn read_u32_ne() {
    let data = [0x12u8, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0];
    let mut cursor = Cursor::new(data);

    let parts = match cfg!(target_endian = "big") {
        true => (0x12345678, 0x9ABCDEF0),
        false => (0x78563412, 0xF0DEBC9A),
    };

    assert_eq!(cursor.read_u32_ne().unwrap(), parts.0);
    assert_eq!(cursor.read_u32_ne().unwrap(), parts.1);

    // overflow
    let val = cursor.read_u32_ne();
    assert!(val.is_err());
}

#[test]
fn read_u32_le() {
    let data = [0x12u8, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0];
    let mut cursor = Cursor::new(data);

    assert_eq!(cursor.read_u32_le().unwrap(), 0x78563412);
    assert_eq!(cursor.read_u32_le().unwrap(), 0xF0DEBC9A);

    // overflow
    let val = cursor.read_u32_le();
    assert!(val.is_err());
}

#[test]
fn read_u32_be() {
    let data = [0x12u8, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0];
    let mut cursor = Cursor::new(data);

    assert_eq!(cursor.read_u32_be().unwrap(), 0x12345678);
    assert_eq!(cursor.read_u32_be().unwrap(), 0x9ABCDEF0);

    // overflow
    let val = cursor.read_u32_be();
    assert!(val.is_err());
}

#[test]
fn read_u64_ne() {
    let data = [
        0x12u8, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0, 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD,
        0xEF,
    ];
    let mut cursor = Cursor::new(data);

    let parts = match cfg!(target_endian = "big") {
        true => (0x123456789ABCDEF0, 0x0123456789ABCDEF),
        false => (0xF0DEBC9A78563412, 0xEFCDAB8967452301),
    };

    assert_eq!(cursor.read_u64_ne().unwrap(), parts.0);
    assert_eq!(cursor.read_u64_ne().unwrap(), parts.1);

    // overflow
    let val = cursor.read_u64_ne();
    assert!(val.is_err());
}

#[test]
fn read_u64_le() {
    let data = [
        0x12u8, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0, 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD,
        0xEF,
    ];
    let mut cursor = Cursor::new(data);

    assert_eq!(cursor.read_u64_le().unwrap(), 0xF0DEBC9A78563412);
    assert_eq!(cursor.read_u64_le().unwrap(), 0xEFCDAB8967452301);

    // overflow
    let val = cursor.read_u64_le();
    assert!(val.is_err());
}

#[test]
fn read_u64_be() {
    let data = [
        0x12u8, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0, 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD,
        0xEF,
    ];
    let mut cursor = Cursor::new(data);

    assert_eq!(cursor.read_u64_be().unwrap(), 0x123456789ABCDEF0);
    assert_eq!(cursor.read_u64_be().unwrap(), 0x0123456789ABCDEF);

    // overflow
    let val = cursor.read_u64_be();
    assert!(val.is_err());
}

#[test]
fn read_u128_ne() {
    let data = [
        1u8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0,
    ];
    let mut cursor = Cursor::new(data);

    let parts = match cfg!(target_endian = "big") {
        true => (
            0x01000000000000000000000000000000,
            0x01000000000000000000000000000000,
        ),
        false => (
            0x00000000000000000000000000000001,
            0x00000000000000000000000000000001,
        ),
    };

    assert_eq!(cursor.read_u128_ne().unwrap(), parts.0);
    assert_eq!(cursor.read_u128_ne().unwrap(), parts.1);

    // overflow
    let val = cursor.read_u128_ne();
    assert!(val.is_err());
}

#[test]
fn read_u128_le() {
    let data = [
        1u8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0,
    ];
    let mut cursor = Cursor::new(data);

    assert_eq!(
        cursor.read_u128_le().unwrap(),
        0x00000000000000000000000000000001
    );
    assert_eq!(
        cursor.read_u128_le().unwrap(),
        0x00000000000000000000000000000001
    );

    // overflow
    let val = cursor.read_u128_le();
    assert!(val.is_err());
}

#[test]
fn read_vec() {
    let data = [0u8, 1, 2, 3, 4, 5, 6, 7];
    let mut cursor = Cursor::new(data);

    let val: Vec<u8> = cursor.read_vec(4).unwrap();
    assert_eq!(val, vec![0, 1, 2, 3]);

    // overflow
    let val: Result<Vec<u8>> = cursor.read_vec(10);
    assert!(val.is_err());
}

#[test]
fn read_str() {
    let data = [0x41u8, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48];
    let mut cursor = Cursor::new(data);

    let val = cursor.read_str(4).unwrap();
    assert_eq!(val, String::from("ABCD"));

    // overflow
    let val: Result<String> = cursor.read_str(10);
    assert!(val.is_err());
}