1 #![feature(int_bits_const)]
2 #![feature(maybe_uninit_slice)]
3 #![feature(maybe_uninit_uninit_array)]
5 use rustc_serialize::leb128::*;
6 use std::mem::MaybeUninit;
8 macro_rules! impl_test_unsigned_leb128 {
9 ($test_name:ident, $write_fn_name:ident, $read_fn_name:ident, $int_ty:ident) => {
12 // Test 256 evenly spaced values of integer range,
13 // integer max value, and some "random" numbers.
14 let mut values = Vec::new();
16 let increment = (1 as $int_ty) << ($int_ty::BITS - 8);
17 values.extend((0..256).map(|i| $int_ty::MIN + i * increment));
19 values.push($int_ty::MAX);
22 (-500..500).map(|i| (i as $int_ty).wrapping_mul(0x12345789ABCDEFu64 as $int_ty)),
25 let mut stream = Vec::new();
28 let mut buf = MaybeUninit::uninit_array();
29 stream.extend($write_fn_name(&mut buf, x));
33 for &expected in &values {
34 let (actual, bytes_read) = $read_fn_name(&stream[position..]);
35 assert_eq!(expected, actual);
36 position += bytes_read;
38 assert_eq!(stream.len(), position);
43 impl_test_unsigned_leb128!(test_u16_leb128, write_u16_leb128, read_u16_leb128, u16);
44 impl_test_unsigned_leb128!(test_u32_leb128, write_u32_leb128, read_u32_leb128, u32);
45 impl_test_unsigned_leb128!(test_u64_leb128, write_u64_leb128, read_u64_leb128, u64);
46 impl_test_unsigned_leb128!(test_u128_leb128, write_u128_leb128, read_u128_leb128, u128);
47 impl_test_unsigned_leb128!(test_usize_leb128, write_usize_leb128, read_usize_leb128, usize);
49 macro_rules! impl_test_signed_leb128 {
50 ($test_name:ident, $write_fn_name:ident, $read_fn_name:ident, $int_ty:ident) => {
53 // Test 256 evenly spaced values of integer range,
54 // integer max value, and some "random" numbers.
55 let mut values = Vec::new();
57 let mut value = $int_ty::MIN;
58 let increment = (1 as $int_ty) << ($int_ty::BITS - 8);
62 // The addition in the last loop iteration overflows.
63 value = value.wrapping_add(increment);
66 values.push($int_ty::MAX);
69 (-500..500).map(|i| (i as $int_ty).wrapping_mul(0x12345789ABCDEFi64 as $int_ty)),
72 let mut stream = Vec::new();
75 let mut buf = MaybeUninit::uninit_array();
76 stream.extend($write_fn_name(&mut buf, x));
80 for &expected in &values {
81 let (actual, bytes_read) = $read_fn_name(&stream[position..]);
82 assert_eq!(expected, actual);
83 position += bytes_read;
85 assert_eq!(stream.len(), position);
90 impl_test_signed_leb128!(test_i16_leb128, write_i16_leb128, read_i16_leb128, i16);
91 impl_test_signed_leb128!(test_i32_leb128, write_i32_leb128, read_i32_leb128, i32);
92 impl_test_signed_leb128!(test_i64_leb128, write_i64_leb128, read_i64_leb128, i64);
93 impl_test_signed_leb128!(test_i128_leb128, write_i128_leb128, read_i128_leb128, i128);
94 impl_test_signed_leb128!(test_isize_leb128, write_isize_leb128, read_isize_leb128, isize);