1 files changed, 211 insertions, 0 deletions
diff --git a/vendor/serde_json/tests/lexical/math.rs b/vendor/serde_json/tests/lexical/math.rs
new file mode 100644
index 0000000..79d3ef3
--- /dev/null
+++ b/vendor/serde_json/tests/lexical/math.rs
@@ -0,0 +1,211 @@
+// Adapted from https://github.com/Alexhuszagh/rust-lexical.
+
+use crate::lexical::math::{Limb, Math};
+use std::cmp;
+
+#[derive(Clone, Default)]
+struct Bigint {
+    data: Vec<Limb>,
+}
+
+impl Math for Bigint {
+    fn data(&self) -> &Vec<Limb> {
+        &self.data
+    }
+
+    fn data_mut(&mut self) -> &mut Vec<Limb> {
+        &mut self.data
+    }
+}
+
+#[cfg(limb_width_32)]
+pub(crate) fn from_u32(x: &[u32]) -> Vec<Limb> {
+    x.iter().cloned().collect()
+}
+
+#[cfg(limb_width_64)]
+pub(crate) fn from_u32(x: &[u32]) -> Vec<Limb> {
+    let mut v = Vec::<Limb>::default();
+    for xi in x.chunks(2) {
+        match xi.len() {
+            1 => v.push(xi[0] as u64),
+            2 => v.push(((xi[1] as u64) << 32) | (xi[0] as u64)),
+            _ => unreachable!(),
+        }
+    }
+
+    v
+}
+
+#[test]
+fn compare_test() {
+    // Simple
+    let x = Bigint {
+        data: from_u32(&[1]),
+    };
+    let y = Bigint {
+        data: from_u32(&[2]),
+    };
+    assert_eq!(x.compare(&y), cmp::Ordering::Less);
+    assert_eq!(x.compare(&x), cmp::Ordering::Equal);
+    assert_eq!(y.compare(&x), cmp::Ordering::Greater);
+
+    // Check asymmetric
+    let x = Bigint {
+        data: from_u32(&[5, 1]),
+    };
+    let y = Bigint {
+        data: from_u32(&[2]),
+    };
+    assert_eq!(x.compare(&y), cmp::Ordering::Greater);
+    assert_eq!(x.compare(&x), cmp::Ordering::Equal);
+    assert_eq!(y.compare(&x), cmp::Ordering::Less);
+
+    // Check when we use reverse ordering properly.
+    let x = Bigint {
+        data: from_u32(&[5, 1, 9]),
+    };
+    let y = Bigint {
+        data: from_u32(&[6, 2, 8]),
+    };
+    assert_eq!(x.compare(&y), cmp::Ordering::Greater);
+    assert_eq!(x.compare(&x), cmp::Ordering::Equal);
+    assert_eq!(y.compare(&x), cmp::Ordering::Less);
+
+    // Complex scenario, check it properly uses reverse ordering.
+    let x = Bigint {
+        data: from_u32(&[0, 1, 9]),
+    };
+    let y = Bigint {
+        data: from_u32(&[4294967295, 0, 9]),
+    };
+    assert_eq!(x.compare(&y), cmp::Ordering::Greater);
+    assert_eq!(x.compare(&x), cmp::Ordering::Equal);
+    assert_eq!(y.compare(&x), cmp::Ordering::Less);
+}
+
+#[test]
+fn hi64_test() {
+    assert_eq!(Bigint::from_u64(0xA).hi64(), (0xA000000000000000, false));
+    assert_eq!(Bigint::from_u64(0xAB).hi64(), (0xAB00000000000000, false));
+    assert_eq!(
+        Bigint::from_u64(0xAB00000000).hi64(),
+        (0xAB00000000000000, false)
+    );
+    assert_eq!(
+        Bigint::from_u64(0xA23456789A).hi64(),
+        (0xA23456789A000000, false)
+    );
+}
+
+#[test]
+fn bit_length_test() {
+    let x = Bigint {
+        data: from_u32(&[0, 0, 0, 1]),
+    };
+    assert_eq!(x.bit_length(), 97);
+
+    let x = Bigint {
+        data: from_u32(&[0, 0, 0, 3]),
+    };
+    assert_eq!(x.bit_length(), 98);
+
+    let x = Bigint {
+        data: from_u32(&[1 << 31]),
+    };
+    assert_eq!(x.bit_length(), 32);
+}
+
+#[test]
+fn iadd_small_test() {
+    // Overflow check (single)
+    // This should set all the internal data values to 0, the top
+    // value to (1<<31), and the bottom value to (4>>1).
+    // This is because the max_value + 1 leads to all 0s, we set the
+    // topmost bit to 1.
+    let mut x = Bigint {
+        data: from_u32(&[4294967295]),
+    };
+    x.iadd_small(5);
+    assert_eq!(x.data, from_u32(&[4, 1]));
+
+    // No overflow, single value
+    let mut x = Bigint {
+        data: from_u32(&[5]),
+    };
+    x.iadd_small(7);
+    assert_eq!(x.data, from_u32(&[12]));
+
+    // Single carry, internal overflow
+    let mut x = Bigint::from_u64(0x80000000FFFFFFFF);
+    x.iadd_small(7);
+    assert_eq!(x.data, from_u32(&[6, 0x80000001]));
+
+    // Double carry, overflow
+    let mut x = Bigint::from_u64(0xFFFFFFFFFFFFFFFF);
+    x.iadd_small(7);
+    assert_eq!(x.data, from_u32(&[6, 0, 1]));
+}
+
+#[test]
+fn imul_small_test() {
+    // No overflow check, 1-int.
+    let mut x = Bigint {
+        data: from_u32(&[5]),
+    };
+    x.imul_small(7);
+    assert_eq!(x.data, from_u32(&[35]));
+
+    // No overflow check, 2-ints.
+    let mut x = Bigint::from_u64(0x4000000040000);
+    x.imul_small(5);
+    assert_eq!(x.data, from_u32(&[0x00140000, 0x140000]));
+
+    // Overflow, 1 carry.
+    let mut x = Bigint {
+        data: from_u32(&[0x33333334]),
+    };
+    x.imul_small(5);
+    assert_eq!(x.data, from_u32(&[4, 1]));
+
+    // Overflow, 1 carry, internal.
+    let mut x = Bigint::from_u64(0x133333334);
+    x.imul_small(5);
+    assert_eq!(x.data, from_u32(&[4, 6]));
+
+    // Overflow, 2 carries.
+    let mut x = Bigint::from_u64(0x3333333333333334);
+    x.imul_small(5);
+    assert_eq!(x.data, from_u32(&[4, 0, 1]));
+}
+
+#[test]
+fn shl_test() {
+    // Pattern generated via `''.join(["1" +"0"*i for i in range(20)])`
+    let mut big = Bigint {
+        data: from_u32(&[0xD2210408]),
+    };
+    big.ishl(5);
+    assert_eq!(big.data, from_u32(&[0x44208100, 0x1A]));
+    big.ishl(32);
+    assert_eq!(big.data, from_u32(&[0, 0x44208100, 0x1A]));
+    big.ishl(27);
+    assert_eq!(big.data, from_u32(&[0, 0, 0xD2210408]));
+
+    // 96-bits of previous pattern
+    let mut big = Bigint {
+        data: from_u32(&[0x20020010, 0x8040100, 0xD2210408]),
+    };
+    big.ishl(5);
+    assert_eq!(big.data, from_u32(&[0x400200, 0x802004, 0x44208101, 0x1A]));
+    big.ishl(32);
+    assert_eq!(
+        big.data,
+        from_u32(&[0, 0x400200, 0x802004, 0x44208101, 0x1A])
+    );
+    big.ishl(27);
+    assert_eq!(
+        big.data,
+        from_u32(&[0, 0, 0x20020010, 0x8040100, 0xD2210408])
+    );
+}