1 #![feature(maybe_uninit_slice)]
2 #![feature(maybe_uninit_uninit_array)]
4 use rustc_serialize::leb128::*;
5 use std::mem::MaybeUninit;
7 macro_rules! impl_test_unsigned_leb128 {
8 ($test_name:ident, $write_fn_name:ident, $read_fn_name:ident, $int_ty:ident) => {
11 // Test 256 evenly spaced values of integer range,
12 // integer max value, and some "random" numbers.
13 let mut values = Vec::new();
15 let increment = (1 as $int_ty) << ($int_ty::BITS - 8);
16 values.extend((0..256).map(|i| $int_ty::MIN + i * increment));
18 values.push($int_ty::MAX);
21 (-500..500).map(|i| (i as $int_ty).wrapping_mul(0x12345789ABCDEFu64 as $int_ty)),
24 let mut stream = Vec::new();
27 let mut buf = MaybeUninit::uninit_array();
28 stream.extend($write_fn_name(&mut buf, x));
32 for &expected in &values {
33 let (actual, bytes_read) = $read_fn_name(&stream[position..]);
34 assert_eq!(expected, actual);
35 position += bytes_read;
37 assert_eq!(stream.len(), position);
42 impl_test_unsigned_leb128!(test_u16_leb128, write_u16_leb128, read_u16_leb128, u16);
43 impl_test_unsigned_leb128!(test_u32_leb128, write_u32_leb128, read_u32_leb128, u32);
44 impl_test_unsigned_leb128!(test_u64_leb128, write_u64_leb128, read_u64_leb128, u64);
45 impl_test_unsigned_leb128!(test_u128_leb128, write_u128_leb128, read_u128_leb128, u128);
46 impl_test_unsigned_leb128!(test_usize_leb128, write_usize_leb128, read_usize_leb128, usize);
48 macro_rules! impl_test_signed_leb128 {
49 ($test_name:ident, $write_fn_name:ident, $read_fn_name:ident, $int_ty:ident) => {
52 // Test 256 evenly spaced values of integer range,
53 // integer max value, and some "random" numbers.
54 let mut values = Vec::new();
56 let mut value = $int_ty::MIN;
57 let increment = (1 as $int_ty) << ($int_ty::BITS - 8);
61 // The addition in the last loop iteration overflows.
62 value = value.wrapping_add(increment);
65 values.push($int_ty::MAX);
68 (-500..500).map(|i| (i as $int_ty).wrapping_mul(0x12345789ABCDEFi64 as $int_ty)),
71 let mut stream = Vec::new();
74 let mut buf = MaybeUninit::uninit_array();
75 stream.extend($write_fn_name(&mut buf, x));
79 for &expected in &values {
80 let (actual, bytes_read) = $read_fn_name(&stream[position..]);
81 assert_eq!(expected, actual);
82 position += bytes_read;
84 assert_eq!(stream.len(), position);
89 impl_test_signed_leb128!(test_i16_leb128, write_i16_leb128, read_i16_leb128, i16);
90 impl_test_signed_leb128!(test_i32_leb128, write_i32_leb128, read_i32_leb128, i32);
91 impl_test_signed_leb128!(test_i64_leb128, write_i64_leb128, read_i64_leb128, i64);
92 impl_test_signed_leb128!(test_i128_leb128, write_i128_leb128, read_i128_leb128, i128);
93 impl_test_signed_leb128!(test_isize_leb128, write_isize_leb128, read_isize_leb128, isize);