forked from TrueCloudLab/neoneo-go
628656483a
* Fixed TCP read + Uint256 reversed array + started on some core pieces * Disabled some debug output + muted test * 0.5.0
82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
package util
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import (
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"encoding/hex"
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"fmt"
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)
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const uint256Size = 32
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// Uint256 is a 32 byte long unsigned integer.
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type Uint256 [uint256Size]uint8
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// Uint256DecodeFromString returns an Uint256 from a (hex) string.
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func Uint256DecodeFromString(s string) (Uint256, error) {
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var val Uint256
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if len(s) != uint256Size*2 {
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return val, fmt.Errorf("expected string size of %d got %d", uint256Size*2, len(s))
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}
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b, err := hex.DecodeString(s)
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if err != nil {
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return val, err
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}
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b = ReverseByteSlice(b)
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return Uint256DecodeFromBytes(b)
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}
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// Uint256DecodeFromBytes return an Uint256 from a byte slice.
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func Uint256DecodeFromBytes(b []byte) (Uint256, error) {
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var val Uint256
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if len(b) != uint256Size {
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return val, fmt.Errorf("expected []byte of size %d got %d", uint256Size, len(b))
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}
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for i := 0; i < uint256Size; i++ {
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val[i] = b[i]
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}
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return val, nil
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}
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func ReverseByteSlice(b []byte) []byte {
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dest := make([]byte, len(b))
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for i, j := 0, len(b)-1; i < j; i, j = i+1, j-1 {
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dest[i], dest[j] = b[j], b[i]
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}
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return dest
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}
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// ToSlice returns a byte slice of u.
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func (u Uint256) ToSlice() []byte {
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b := make([]byte, uint256Size)
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for i := 0; i < uint256Size; i++ {
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b[i] = byte(u[i])
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}
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return b
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}
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// ToSliceReverse returns a reversed byte slice of u.
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func (u Uint256) ToSliceReverse() []byte {
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b := make([]byte, uint256Size)
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for i, j := 0, uint256Size-1; i < j; i, j = i+1, j-1 {
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b[i], b[j] = byte(u[j]), byte(u[i])
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}
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return b
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}
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// Equals returns true if both Uint256 values are the same.
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func (u Uint256) Equals(other Uint256) bool {
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return u.String() == other.String()
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}
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// String implements the stringer interface.
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func (u Uint256) String() string {
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return hex.EncodeToString(u.ToSliceReverse())
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}
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