mirror of
https://github.com/fumiama/unibase2n.git
synced 2026-06-05 00:32:47 +08:00
30 lines
1.1 KiB
Go
30 lines
1.1 KiB
Go
package unibase2n
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func TestUint128be(t *testing.T) {
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buf := [16]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
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zero := readuint128be(make([]byte, 16))
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one := readuint128be([]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1})
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num := readuint128be(buf[:])
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num.add(one)
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assert.Equal(t, num, zero)
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num.add(readuint128be([]byte{0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef}))
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num.shr(8)
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assert.Equal(t, num, &uint128be{0x001234567890abcd, 0xef1234567890abcd})
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num.shr(16)
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assert.Equal(t, num, &uint128be{0x0000001234567890, 0xabcdef1234567890})
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num.shr(32)
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assert.Equal(t, num, &uint128be{0x0000000000000012, 0x34567890abcdef12})
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num.shr(1)
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// 因为 num.a 低 1 位为 0 所以可以成功
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assert.Equal(t, num, &uint128be{0x0000000000000012 >> 1, 0x34567890abcdef12 >> 1})
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num.shr(7)
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num.write(buf[:])
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assert.Equal(t, buf, [16]byte{0, 0, 0, 0, 0, 0, 0, 0, 0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef})
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}
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