diff options
Diffstat (limited to 'ethutil/number/int.go')
-rw-r--r-- | ethutil/number/int.go | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/ethutil/number/int.go b/ethutil/number/int.go deleted file mode 100644 index 9a41fe3e5..000000000 --- a/ethutil/number/int.go +++ /dev/null @@ -1,181 +0,0 @@ -package number - -import ( - "math/big" - - "github.com/ethereum/go-ethereum/ethutil" -) - -var tt256 = new(big.Int).Lsh(big.NewInt(1), 256) -var tt256m1 = new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1)) -var tt255 = new(big.Int).Lsh(big.NewInt(1), 255) - -func limitUnsigned256(x *Number) *Number { - x.num.And(x.num, tt256m1) - return x -} - -func limitSigned256(x *Number) *Number { - if x.num.Cmp(tt255) < 0 { - return x - } else { - x.num.Sub(x.num, tt256) - return x - } -} - -// Number function -type Initialiser func(n int64) *Number - -// A Number represents a generic integer with a bounding function limiter. Limit is called after each operations -// to give "fake" bounded integers. New types of Number can be created through NewInitialiser returning a lambda -// with the new Initialiser. -type Number struct { - num *big.Int - limit func(n *Number) *Number -} - -// Returns a new initialiser for a new *Number without having to expose certain fields -func NewInitialiser(limiter func(*Number) *Number) Initialiser { - return func(n int64) *Number { - return &Number{big.NewInt(n), limiter} - } -} - -// Return a Number with a UNSIGNED limiter up to 256 bits -func Uint256(n int64) *Number { - return &Number{big.NewInt(n), limitUnsigned256} -} - -// Return a Number with a SIGNED limiter up to 256 bits -func Int256(n int64) *Number { - return &Number{big.NewInt(n), limitSigned256} -} - -// Returns a Number with a SIGNED unlimited size -func Big(n int64) *Number { - return &Number{big.NewInt(n), func(x *Number) *Number { return x }} -} - -// Sets i to sum of x+y -func (i *Number) Add(x, y *Number) *Number { - i.num.Add(x.num, y.num) - return i.limit(i) -} - -// Sets i to difference of x-y -func (i *Number) Sub(x, y *Number) *Number { - i.num.Sub(x.num, y.num) - return i.limit(i) -} - -// Sets i to product of x*y -func (i *Number) Mul(x, y *Number) *Number { - i.num.Mul(x.num, y.num) - return i.limit(i) -} - -// Sets i to the quotient prodject of x/y -func (i *Number) Div(x, y *Number) *Number { - i.num.Div(x.num, y.num) - return i.limit(i) -} - -// Sets i to x % y -func (i *Number) Mod(x, y *Number) *Number { - i.num.Mod(x.num, y.num) - return i.limit(i) -} - -// Sets i to x << s -func (i *Number) Lsh(x *Number, s uint) *Number { - i.num.Lsh(x.num, s) - return i.limit(i) -} - -// Sets i to x^y -func (i *Number) Pow(x, y *Number) *Number { - i.num.Exp(x.num, y.num, big.NewInt(0)) - return i.limit(i) -} - -// Setters - -// Set x to i -func (i *Number) Set(x *Number) *Number { - i.num.Set(x.num) - return i.limit(i) -} - -// Set x bytes to i -func (i *Number) SetBytes(x []byte) *Number { - i.num.SetBytes(x) - return i.limit(i) -} - -// Cmp compares x and y and returns: -// -// -1 if x < y -// 0 if x == y -// +1 if x > y -func (i *Number) Cmp(x *Number) int { - return i.num.Cmp(x.num) -} - -// Getters - -// Returns the string representation of i -func (i *Number) String() string { - return i.num.String() -} - -// Returns the byte representation of i -func (i *Number) Bytes() []byte { - return i.num.Bytes() -} - -// Uint64 returns the Uint64 representation of x. If x cannot be represented in an int64, the result is undefined. -func (i *Number) Uint64() uint64 { - return i.num.Uint64() -} - -// Int64 returns the int64 representation of x. If x cannot be represented in an int64, the result is undefined. -func (i *Number) Int64() int64 { - return i.num.Int64() -} - -// Returns the signed version of i -func (i *Number) Int256() *Number { - return Int(0).Set(i) -} - -// Returns the unsigned version of i -func (i *Number) Uint256() *Number { - return Uint(0).Set(i) -} - -// Returns the index of the first bit that's set to 1 -func (i *Number) FirstBitSet() int { - for j := 0; j < i.num.BitLen(); j++ { - if i.num.Bit(j) > 0 { - return j - } - } - - return i.num.BitLen() -} - -// Variables - -var ( - Zero = Uint(0) - One = Uint(1) - Two = Uint(2) - MaxUint256 = Uint(0).SetBytes(ethutil.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff")) - - MinOne = Int(-1) - - // "typedefs" - Uint = Uint256 - Int = Int256 -) |