forked from cerc-io/plugeth
common: improve documentation comments (#16701)
This commit adds many comments and removes unused code. It also removes the EmptyHash function, which had some uses but was silly.
This commit is contained in:
kiel barry
Felix Lange
parent
998f6564b2
commit
84f8c0cc1f
@ -19,15 +19,20 @@ package common
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import "encoding/hex"
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// ToHex returns the hex representation of b, prefixed with '0x'.
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// For empty slices, the return value is "0x0".
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//
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// Deprecated: use hexutil.Encode instead.
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func ToHex(b []byte) string {
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hex := Bytes2Hex(b)
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// Prefer output of "0x0" instead of "0x"
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if len(hex) == 0 {
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hex = "0"
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}
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return "0x" + hex
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}
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// FromHex returns the bytes represented by the hexadecimal string s.
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// s may be prefixed with "0x".
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func FromHex(s string) []byte {
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if len(s) > 1 {
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if s[0:2] == "0x" || s[0:2] == "0X" {
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@ -40,9 +45,7 @@ func FromHex(s string) []byte {
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return Hex2Bytes(s)
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}
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// Copy bytes
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//
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// Returns an exact copy of the provided bytes
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// CopyBytes returns an exact copy of the provided bytes.
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func CopyBytes(b []byte) (copiedBytes []byte) {
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if b == nil {
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return nil
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@ -53,14 +56,17 @@ func CopyBytes(b []byte) (copiedBytes []byte) {
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return
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}
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// hasHexPrefix validates str begins with '0x' or '0X'.
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func hasHexPrefix(str string) bool {
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return len(str) >= 2 && str[0] == '0' && (str[1] == 'x' || str[1] == 'X')
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}
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// isHexCharacter returns bool of c being a valid hexadecimal.
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func isHexCharacter(c byte) bool {
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return ('0' <= c && c <= '9') || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F')
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}
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// isHex validates whether each byte is valid hexadecimal string.
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func isHex(str string) bool {
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if len(str)%2 != 0 {
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return false
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@ -73,16 +79,18 @@ func isHex(str string) bool {
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return true
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}
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// Bytes2Hex returns the hexadecimal encoding of d.
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func Bytes2Hex(d []byte) string {
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return hex.EncodeToString(d)
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}
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// Hex2Bytes returns the bytes represented by the hexadecimal string str.
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func Hex2Bytes(str string) []byte {
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h, _ := hex.DecodeString(str)
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return h
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}
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// Hex2BytesFixed returns bytes of a specified fixed length flen.
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func Hex2BytesFixed(str string, flen int) []byte {
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h, _ := hex.DecodeString(str)
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if len(h) == flen {
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@ -96,6 +104,7 @@ func Hex2BytesFixed(str string, flen int) []byte {
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return hh
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}
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// RightPadBytes zero-pads slice to the right up to length l.
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func RightPadBytes(slice []byte, l int) []byte {
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if l <= len(slice) {
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return slice
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@ -107,6 +116,7 @@ func RightPadBytes(slice []byte, l int) []byte {
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return padded
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}
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// LeftPadBytes zero-pads slice to the left up to length l.
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func LeftPadBytes(slice []byte, l int) []byte {
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if l <= len(slice) {
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return slice
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@ -78,7 +78,7 @@ func ParseBig256(s string) (*big.Int, bool) {
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return bigint, ok
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}
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// MustParseBig parses s as a 256 bit big integer and panics if the string is invalid.
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// MustParseBig256 parses s as a 256 bit big integer and panics if the string is invalid.
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func MustParseBig256(s string) *big.Int {
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v, ok := ParseBig256(s)
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if !ok {
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@ -186,9 +186,8 @@ func U256(x *big.Int) *big.Int {
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func S256(x *big.Int) *big.Int {
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if x.Cmp(tt255) < 0 {
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return x
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} else {
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return new(big.Int).Sub(x, tt256)
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}
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return new(big.Int).Sub(x, tt256)
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}
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// Exp implements exponentiation by squaring.
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@ -34,13 +34,12 @@ func limitUnsigned256(x *Number) *Number {
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func limitSigned256(x *Number) *Number {
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if x.num.Cmp(tt255) < 0 {
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return x
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} else {
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x.num.Sub(x.num, tt256)
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return x
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}
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x.num.Sub(x.num, tt256)
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return x
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}
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// Number function
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// Initialiser is a Number function
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type Initialiser func(n int64) *Number
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// A Number represents a generic integer with a bounding function limiter. Limit is called after each operations
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@ -51,65 +50,65 @@ type Number struct {
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limit func(n *Number) *Number
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}
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// Returns a new initialiser for a new *Number without having to expose certain fields
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// NewInitialiser returns a new initialiser for a new *Number without having to expose certain fields
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func NewInitialiser(limiter func(*Number) *Number) Initialiser {
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return func(n int64) *Number {
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return &Number{big.NewInt(n), limiter}
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}
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}
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// Return a Number with a UNSIGNED limiter up to 256 bits
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// Uint256 returns a Number with a UNSIGNED limiter up to 256 bits
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func Uint256(n int64) *Number {
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return &Number{big.NewInt(n), limitUnsigned256}
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}
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// Return a Number with a SIGNED limiter up to 256 bits
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// Int256 returns Number with a SIGNED limiter up to 256 bits
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func Int256(n int64) *Number {
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return &Number{big.NewInt(n), limitSigned256}
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}
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// Returns a Number with a SIGNED unlimited size
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// Big returns a Number with a SIGNED unlimited size
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func Big(n int64) *Number {
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return &Number{big.NewInt(n), func(x *Number) *Number { return x }}
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}
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// Sets i to sum of x+y
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// Add sets i to sum of x+y
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func (i *Number) Add(x, y *Number) *Number {
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i.num.Add(x.num, y.num)
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return i.limit(i)
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}
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// Sets i to difference of x-y
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// Sub sets i to difference of x-y
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func (i *Number) Sub(x, y *Number) *Number {
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i.num.Sub(x.num, y.num)
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return i.limit(i)
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}
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// Sets i to product of x*y
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// Mul sets i to product of x*y
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func (i *Number) Mul(x, y *Number) *Number {
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i.num.Mul(x.num, y.num)
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return i.limit(i)
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}
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// Sets i to the quotient prodject of x/y
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// Div sets i to the quotient prodject of x/y
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func (i *Number) Div(x, y *Number) *Number {
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i.num.Div(x.num, y.num)
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return i.limit(i)
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}
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// Sets i to x % y
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// Mod sets i to x % y
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func (i *Number) Mod(x, y *Number) *Number {
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i.num.Mod(x.num, y.num)
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return i.limit(i)
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}
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// Sets i to x << s
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// Lsh sets i to x << s
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func (i *Number) Lsh(x *Number, s uint) *Number {
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i.num.Lsh(x.num, s)
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return i.limit(i)
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}
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// Sets i to x^y
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// Pow sets i to x^y
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func (i *Number) Pow(x, y *Number) *Number {
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i.num.Exp(x.num, y.num, big.NewInt(0))
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return i.limit(i)
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@ -117,13 +116,13 @@ func (i *Number) Pow(x, y *Number) *Number {
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// Setters
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// Set x to i
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// Set sets x to i
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func (i *Number) Set(x *Number) *Number {
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i.num.Set(x.num)
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return i.limit(i)
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}
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// Set x bytes to i
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// SetBytes sets x bytes to i
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func (i *Number) SetBytes(x []byte) *Number {
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i.num.SetBytes(x)
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return i.limit(i)
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@ -140,12 +139,12 @@ func (i *Number) Cmp(x *Number) int {
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// Getters
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// Returns the string representation of i
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// String returns the string representation of i
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func (i *Number) String() string {
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return i.num.String()
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}
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// Returns the byte representation of i
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// Bytes returns the byte representation of i
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func (i *Number) Bytes() []byte {
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return i.num.Bytes()
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}
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@ -160,17 +159,17 @@ func (i *Number) Int64() int64 {
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return i.num.Int64()
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}
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// Returns the signed version of i
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// Int256 returns the signed version of i
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func (i *Number) Int256() *Number {
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return Int(0).Set(i)
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}
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// Returns the unsigned version of i
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// Uint256 returns the unsigned version of i
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func (i *Number) Uint256() *Number {
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return Uint(0).Set(i)
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}
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// Returns the index of the first bit that's set to 1
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// FirstBitSet returns the index of the first bit that's set to 1
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func (i *Number) FirstBitSet() int {
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for j := 0; j < i.num.BitLen(); j++ {
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if i.num.Bit(j) > 0 {
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@ -30,6 +30,7 @@ func MakeName(name, version string) string {
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return fmt.Sprintf("%s/v%s/%s/%s", name, version, runtime.GOOS, runtime.Version())
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}
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// FileExist checks if a file exists at filePath.
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func FileExist(filePath string) bool {
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_, err := os.Stat(filePath)
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if err != nil && os.IsNotExist(err) {
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@ -39,9 +40,10 @@ func FileExist(filePath string) bool {
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return true
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}
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func AbsolutePath(Datadir string, filename string) string {
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// AbsolutePath returns datadir + filename, or filename if it is absolute.
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func AbsolutePath(datadir string, filename string) string {
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if filepath.IsAbs(filename) {
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return filename
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}
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return filepath.Join(Datadir, filename)
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return filepath.Join(datadir, filename)
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}
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@ -42,19 +42,30 @@ var (
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// Hash represents the 32 byte Keccak256 hash of arbitrary data.
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type Hash [HashLength]byte
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// BytesToHash sets b to hash.
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// If b is larger than len(h), b will be cropped from the left.
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func BytesToHash(b []byte) Hash {
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var h Hash
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h.SetBytes(b)
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return h
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}
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func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
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func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
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// Get the string representation of the underlying hash
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func (h Hash) Str() string { return string(h[:]) }
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// BigToHash sets byte representation of b to hash.
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// If b is larger than len(h), b will be cropped from the left.
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func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
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// HexToHash sets byte representation of s to hash.
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// If b is larger than len(h), b will be cropped from the left.
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func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
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// Bytes gets the byte representation of the underlying hash.
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func (h Hash) Bytes() []byte { return h[:] }
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// Big converts a hash to a big integer.
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func (h Hash) Big() *big.Int { return new(big.Int).SetBytes(h[:]) }
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func (h Hash) Hex() string { return hexutil.Encode(h[:]) }
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// Hex converts a hash to a hex string.
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func (h Hash) Hex() string { return hexutil.Encode(h[:]) }
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// TerminalString implements log.TerminalStringer, formatting a string for console
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// output during logging.
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@ -89,7 +100,8 @@ func (h Hash) MarshalText() ([]byte, error) {
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return hexutil.Bytes(h[:]).MarshalText()
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}
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// Sets the hash to the value of b. If b is larger than len(h), 'b' will be cropped (from the left).
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// SetBytes sets the hash to the value of b.
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// If b is larger than len(h), b will be cropped from the left.
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func (h *Hash) SetBytes(b []byte) {
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if len(b) > len(h) {
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b = b[len(b)-HashLength:]
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@ -98,16 +110,6 @@ func (h *Hash) SetBytes(b []byte) {
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copy(h[HashLength-len(b):], b)
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}
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// Set string `s` to h. If s is larger than len(h) s will be cropped (from left) to fit.
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func (h *Hash) SetString(s string) { h.SetBytes([]byte(s)) }
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// Sets h to other
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func (h *Hash) Set(other Hash) {
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for i, v := range other {
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h[i] = v
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}
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}
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// Generate implements testing/quick.Generator.
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func (h Hash) Generate(rand *rand.Rand, size int) reflect.Value {
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m := rand.Intn(len(h))
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@ -117,10 +119,6 @@ func (h Hash) Generate(rand *rand.Rand, size int) reflect.Value {
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return reflect.ValueOf(h)
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}
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func EmptyHash(h Hash) bool {
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return h == Hash{}
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}
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// UnprefixedHash allows marshaling a Hash without 0x prefix.
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type UnprefixedHash Hash
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@ -139,13 +137,21 @@ func (h UnprefixedHash) MarshalText() ([]byte, error) {
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// Address represents the 20 byte address of an Ethereum account.
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type Address [AddressLength]byte
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// BytesToAddress returns Address with value b.
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// If b is larger than len(h), b will be cropped from the left.
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func BytesToAddress(b []byte) Address {
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var a Address
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a.SetBytes(b)
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return a
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}
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// BigToAddress returns Address with byte values of b.
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// If b is larger than len(h), b will be cropped from the left.
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func BigToAddress(b *big.Int) Address { return BytesToAddress(b.Bytes()) }
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func HexToAddress(s string) Address { return BytesToAddress(FromHex(s)) }
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// HexToAddress returns Address with byte values of s.
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// If s is larger than len(h), s will be cropped from the left.
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func HexToAddress(s string) Address { return BytesToAddress(FromHex(s)) }
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// IsHexAddress verifies whether a string can represent a valid hex-encoded
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// Ethereum address or not.
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@ -156,11 +162,14 @@ func IsHexAddress(s string) bool {
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return len(s) == 2*AddressLength && isHex(s)
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}
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// Get the string representation of the underlying address
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func (a Address) Str() string { return string(a[:]) }
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// Bytes gets the string representation of the underlying address.
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func (a Address) Bytes() []byte { return a[:] }
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// Big converts an address to a big integer.
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func (a Address) Big() *big.Int { return new(big.Int).SetBytes(a[:]) }
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func (a Address) Hash() Hash { return BytesToHash(a[:]) }
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// Hash converts an address to a hash by left-padding it with zeros.
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func (a Address) Hash() Hash { return BytesToHash(a[:]) }
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// Hex returns an EIP55-compliant hex string representation of the address.
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func (a Address) Hex() string {
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@ -184,7 +193,7 @@ func (a Address) Hex() string {
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return "0x" + string(result)
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}
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// String implements the stringer interface and is used also by the logger.
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// String implements fmt.Stringer.
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func (a Address) String() string {
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return a.Hex()
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}
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@ -195,7 +204,8 @@ func (a Address) Format(s fmt.State, c rune) {
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fmt.Fprintf(s, "%"+string(c), a[:])
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}
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// Sets the address to the value of b. If b is larger than len(a) it will panic
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// SetBytes sets the address to the value of b.
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// If b is larger than len(a) it will panic.
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func (a *Address) SetBytes(b []byte) {
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if len(b) > len(a) {
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b = b[len(b)-AddressLength:]
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@ -203,16 +213,6 @@ func (a *Address) SetBytes(b []byte) {
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copy(a[AddressLength-len(b):], b)
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}
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// Set string `s` to a. If s is larger than len(a) it will panic
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func (a *Address) SetString(s string) { a.SetBytes([]byte(s)) }
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// Sets a to other
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func (a *Address) Set(other Address) {
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for i, v := range other {
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a[i] = v
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}
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}
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// MarshalText returns the hex representation of a.
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func (a Address) MarshalText() ([]byte, error) {
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return hexutil.Bytes(a[:]).MarshalText()
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@ -228,7 +228,7 @@ func (a *Address) UnmarshalJSON(input []byte) error {
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return hexutil.UnmarshalFixedJSON(addressT, input, a[:])
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}
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// UnprefixedHash allows marshaling an Address without 0x prefix.
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// UnprefixedAddress allows marshaling an Address without 0x prefix.
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type UnprefixedAddress Address
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// UnmarshalText decodes the address from hex. The 0x prefix is optional.
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@ -1,64 +0,0 @@
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// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
|
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
// +build none
|
||||
//sed -e 's/_N_/Hash/g' -e 's/_S_/32/g' -e '1d' types_template.go | gofmt -w hash.go
|
||||
|
||||
package common
|
||||
|
||||
import "math/big"
|
||||
|
||||
type _N_ [_S_]byte
|
||||
|
||||
func BytesTo_N_(b []byte) _N_ {
|
||||
var h _N_
|
||||
h.SetBytes(b)
|
||||
return h
|
||||
}
|
||||
func StringTo_N_(s string) _N_ { return BytesTo_N_([]byte(s)) }
|
||||
func BigTo_N_(b *big.Int) _N_ { return BytesTo_N_(b.Bytes()) }
|
||||
func HexTo_N_(s string) _N_ { return BytesTo_N_(FromHex(s)) }
|
||||
|
||||
// Don't use the default 'String' method in case we want to overwrite
|
||||
|
||||
// Get the string representation of the underlying hash
|
||||
func (h _N_) Str() string { return string(h[:]) }
|
||||
func (h _N_) Bytes() []byte { return h[:] }
|
||||
func (h _N_) Big() *big.Int { return new(big.Int).SetBytes(h[:]) }
|
||||
func (h _N_) Hex() string { return "0x" + Bytes2Hex(h[:]) }
|
||||
|
||||
// Sets the hash to the value of b. If b is larger than len(h) it will panic
|
||||
func (h *_N_) SetBytes(b []byte) {
|
||||
// Use the right most bytes
|
||||
if len(b) > len(h) {
|
||||
b = b[len(b)-_S_:]
|
||||
}
|
||||
|
||||
// Reverse the loop
|
||||
for i := len(b) - 1; i >= 0; i-- {
|
||||
h[_S_-len(b)+i] = b[i]
|
||||
}
|
||||
}
|
||||
|
||||
// Set string `s` to h. If s is larger than len(h) it will panic
|
||||
func (h *_N_) SetString(s string) { h.SetBytes([]byte(s)) }
|
||||
|
||||
// Sets h to other
|
||||
func (h *_N_) Set(other _N_) {
|
||||
for i, v := range other {
|
||||
h[i] = v
|
||||
}
|
||||
}
|
||||
@ -99,7 +99,7 @@ func (s *StateSuite) TestNull(c *checker.C) {
|
||||
s.state.SetState(address, common.Hash{}, value)
|
||||
s.state.Commit(false)
|
||||
value = s.state.GetState(address, common.Hash{})
|
||||
if !common.EmptyHash(value) {
|
||||
if value != (common.Hash{}) {
|
||||
c.Errorf("expected empty hash. got %x", value)
|
||||
}
|
||||
}
|
||||
|
||||
@ -124,12 +124,12 @@ func gasSStore(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, m
|
||||
// 1. From a zero-value address to a non-zero value (NEW VALUE)
|
||||
// 2. From a non-zero value address to a zero-value address (DELETE)
|
||||
// 3. From a non-zero to a non-zero (CHANGE)
|
||||
if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) {
|
||||
if val == (common.Hash{}) && y.Sign() != 0 {
|
||||
// 0 => non 0
|
||||
return params.SstoreSetGas, nil
|
||||
} else if !common.EmptyHash(val) && common.EmptyHash(common.BigToHash(y)) {
|
||||
} else if val != (common.Hash{}) && y.Sign() == 0 {
|
||||
// non 0 => 0
|
||||
evm.StateDB.AddRefund(params.SstoreRefundGas)
|
||||
|
||||
return params.SstoreClearGas, nil
|
||||
} else {
|
||||
// non 0 => non 0 (or 0 => 0)
|
||||
|
||||
@ -680,7 +680,7 @@ func (d *Downloader) findAncestor(p *peerConnection, height uint64) (uint64, err
|
||||
}
|
||||
}
|
||||
// If the head fetch already found an ancestor, return
|
||||
if !common.EmptyHash(hash) {
|
||||
if hash != (common.Hash{}) {
|
||||
if int64(number) <= floor {
|
||||
p.log.Warn("Ancestor below allowance", "number", number, "hash", hash, "allowance", floor)
|
||||
return 0, errInvalidAncestor
|
||||
|
||||
Loading…
Reference in New Issue
Block a user