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add bignumber and umod. return error from decode base58
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@@ -38,3 +38,4 @@ coverage.out | |
golangci-lint-report.xml | ||
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# Ignore any other files or directories specific to your project | ||
.vscode/ |
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@@ -0,0 +1,42 @@ | ||
package primitives | ||
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import "math/big" | ||
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type BigNumber struct { | ||
value *big.Int | ||
} | ||
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func NewBigNumberFromInt64(value int64) *BigNumber { | ||
return &BigNumber{ | ||
value: big.NewInt(value), | ||
} | ||
} | ||
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func NewBigNumber(value *big.Int) *BigNumber { | ||
return &BigNumber{ | ||
value: value, | ||
} | ||
} | ||
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func NewBigNumberFromInt(value int64) *BigNumber { | ||
return NewBigNumber(big.NewInt(value)) | ||
} | ||
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// umod returns the unsigned modulus of a and b. | ||
// It ensures the result is always non-negative. | ||
func (a *BigNumber) Umod(b *BigNumber) *BigNumber { | ||
div := new(big.Int) | ||
mod := new(big.Int) | ||
div.DivMod(a.value, b.value, mod) | ||
return &BigNumber{ | ||
value: mod, | ||
} | ||
} | ||
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func (a *BigNumber) ToNumber() int { | ||
return int(a.value.Int64()) | ||
} | ||
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func (a *BigNumber) ToBigInt() *big.Int { | ||
return a.value | ||
} |
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package primitives | ||
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import ( | ||
"testing" | ||
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"github.com/stretchr/testify/require" | ||
) | ||
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// TestBigNumberUmod is a unit test for BigNumber.Umod | ||
func TestBigNumberUmod(t *testing.T) { | ||
require.Equal(t, 2, NewBigNumberFromInt(-178).Umod(NewBigNumberFromInt(10)).ToNumber()) | ||
} |
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