95 lines
3.5 KiB
Rust
95 lines
3.5 KiB
Rust
#![feature(int_bits_const)]
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#![feature(maybe_uninit_slice)]
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#![feature(maybe_uninit_uninit_array)]
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use rustc_serialize::leb128::*;
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use std::mem::MaybeUninit;
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macro_rules! impl_test_unsigned_leb128 {
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($test_name:ident, $write_fn_name:ident, $read_fn_name:ident, $int_ty:ident) => {
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#[test]
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fn $test_name() {
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// Test 256 evenly spaced values of integer range,
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// integer max value, and some "random" numbers.
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let mut values = Vec::new();
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let increment = (1 as $int_ty) << ($int_ty::BITS - 8);
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values.extend((0..256).map(|i| $int_ty::MIN + i * increment));
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values.push($int_ty::MAX);
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values.extend(
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(-500..500).map(|i| (i as $int_ty).wrapping_mul(0x12345789ABCDEFu64 as $int_ty)),
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);
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let mut stream = Vec::new();
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for &x in &values {
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let mut buf = MaybeUninit::uninit_array();
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stream.extend($write_fn_name(&mut buf, x));
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}
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let mut position = 0;
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for &expected in &values {
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let (actual, bytes_read) = $read_fn_name(&stream[position..]);
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assert_eq!(expected, actual);
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position += bytes_read;
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}
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assert_eq!(stream.len(), position);
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}
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};
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}
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impl_test_unsigned_leb128!(test_u16_leb128, write_u16_leb128, read_u16_leb128, u16);
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impl_test_unsigned_leb128!(test_u32_leb128, write_u32_leb128, read_u32_leb128, u32);
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impl_test_unsigned_leb128!(test_u64_leb128, write_u64_leb128, read_u64_leb128, u64);
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impl_test_unsigned_leb128!(test_u128_leb128, write_u128_leb128, read_u128_leb128, u128);
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impl_test_unsigned_leb128!(test_usize_leb128, write_usize_leb128, read_usize_leb128, usize);
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macro_rules! impl_test_signed_leb128 {
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($test_name:ident, $write_fn_name:ident, $read_fn_name:ident, $int_ty:ident) => {
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#[test]
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fn $test_name() {
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// Test 256 evenly spaced values of integer range,
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// integer max value, and some "random" numbers.
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let mut values = Vec::new();
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let mut value = $int_ty::MIN;
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let increment = (1 as $int_ty) << ($int_ty::BITS - 8);
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for _ in 0..256 {
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values.push(value);
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// The addition in the last loop iteration overflows.
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value = value.wrapping_add(increment);
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}
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values.push($int_ty::MAX);
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values.extend(
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(-500..500).map(|i| (i as $int_ty).wrapping_mul(0x12345789ABCDEFi64 as $int_ty)),
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);
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let mut stream = Vec::new();
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for &x in &values {
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let mut buf = MaybeUninit::uninit_array();
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stream.extend($write_fn_name(&mut buf, x));
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}
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let mut position = 0;
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for &expected in &values {
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let (actual, bytes_read) = $read_fn_name(&stream[position..]);
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assert_eq!(expected, actual);
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position += bytes_read;
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}
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assert_eq!(stream.len(), position);
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}
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};
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}
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impl_test_signed_leb128!(test_i16_leb128, write_i16_leb128, read_i16_leb128, i16);
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impl_test_signed_leb128!(test_i32_leb128, write_i32_leb128, read_i32_leb128, i32);
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impl_test_signed_leb128!(test_i64_leb128, write_i64_leb128, read_i64_leb128, i64);
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impl_test_signed_leb128!(test_i128_leb128, write_i128_leb128, read_i128_leb128, i128);
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impl_test_signed_leb128!(test_isize_leb128, write_isize_leb128, read_isize_leb128, isize);
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