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types.go
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/
types.go
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// Copyright 2015 The CortexTheseus Authors
// This file is part of the CortexTheseus library.
//
// The CortexTheseus library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The CortexTheseus library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the CortexTheseus library. If not, see <http://www.gnu.org/licenses/>.
package common
import (
//"bytes"
"encoding/binary"
"encoding/hex"
"math/big"
)
// Lengths of hashes and addresses in bytes.
const (
// HashLength is the expected length of the hash
HashLength = 32
// AddressLength is the expected length of the address
AddressLength = 20
Prefix = "0x"
Prefix_caps = "0X"
)
const (
CuckooCycleLength uint8 = 12
CuckooEdgeBits uint8 = 28
)
type BlockSolution [42]uint32
// Hash represents the 32 byte Keccak256 hash of arbitrary data.
type Hash [HashLength]byte
func Uint64ToHexString(value uint64) string {
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, value)
s := hex.EncodeToString(buf)
return "0x" + s
}
func Uint32ArrayToHexString(value []uint32) string {
buf := make([]byte, len(value)*4)
//for i := 0; i < len(value); i++ {
for i, v := range value {
binary.BigEndian.PutUint32(buf[i*4:], v)
}
//buf := new(bytes.Buffer)
//for _, v := range value {
// binary.Write(buf, binary.BigEndian, v)
//}
return "0x" + hex.EncodeToString(buf)
}
func Uint32ToHexString(value uint32) string {
buf := make([]byte, 4)
binary.BigEndian.PutUint32(buf, value)
s := hex.EncodeToString(buf)
for len(s) < 8 {
s = s + "0"
}
return "0x" + s
}
// Hex2Bytes returns the bytes represented by the hexadecimal string str.
func Hex2Bytes(str string) []byte {
h, _ := hex.DecodeString(str)
return h
}
// FromHex returns the bytes represented by the hexadecimal string s.
// s may be prefixed with "0x".
func FromHex(s string) []byte {
if len(s) > 1 {
if s[0:2] == Prefix || s[0:2] == Prefix_caps {
s = s[2:]
}
}
if len(s)%2 == 1 {
s = "0" + s
}
return Hex2Bytes(s)
}
// BytesToHash sets b to hash.
// If b is larger than len(h), b will be cropped from the left.
func BytesToHash(b []byte) Hash {
var h Hash
h.SetBytes(b)
return h
}
// BigToHash sets byte representation of b to hash.
// If b is larger than len(h), b will be cropped from the left.
func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
// HexToHash sets byte representation of s to hash.
// If b is larger than len(h), b will be cropped from the left.
func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
// SetBytes sets the hash to the value of b.
// If b is larger than len(h), b will be cropped from the left.
func (h *Hash) SetBytes(b []byte) {
if len(b) > len(h) {
b = b[len(b)-HashLength:]
}
copy(h[HashLength-len(b):], b)
}
// Bytes gets the byte representation of the underlying hash.
func (h Hash) Bytes() []byte { return h[:] }
// Big converts a hash to a big integer.
func (h Hash) Big() *big.Int { return new(big.Int).SetBytes(h[:]) }