mirror of
https://github.com/ceph/ceph-csi.git
synced 2025-06-13 02:33:34 +00:00
vendor files
This commit is contained in:
Serguei Bezverkhi
615
vendor/gopkg.in/inf.v0/dec.go
generated
vendored
Normal file
615
vendor/gopkg.in/inf.v0/dec.go
generated
vendored
Normal file
@ -0,0 +1,615 @@
|
||||
// Package inf (type inf.Dec) implements "infinite-precision" decimal
|
||||
// arithmetic.
|
||||
// "Infinite precision" describes two characteristics: practically unlimited
|
||||
// precision for decimal number representation and no support for calculating
|
||||
// with any specific fixed precision.
|
||||
// (Although there is no practical limit on precision, inf.Dec can only
|
||||
// represent finite decimals.)
|
||||
//
|
||||
// This package is currently in experimental stage and the API may change.
|
||||
//
|
||||
// This package does NOT support:
|
||||
// - rounding to specific precisions (as opposed to specific decimal positions)
|
||||
// - the notion of context (each rounding must be explicit)
|
||||
// - NaN and Inf values, and distinguishing between positive and negative zero
|
||||
// - conversions to and from float32/64 types
|
||||
//
|
||||
// Features considered for possible addition:
|
||||
// + formatting options
|
||||
// + Exp method
|
||||
// + combined operations such as AddRound/MulAdd etc
|
||||
// + exchanging data in decimal32/64/128 formats
|
||||
//
|
||||
package inf // import "gopkg.in/inf.v0"
|
||||
|
||||
// TODO:
|
||||
// - avoid excessive deep copying (quo and rounders)
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"io"
|
||||
"math/big"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// A Dec represents a signed arbitrary-precision decimal.
|
||||
// It is a combination of a sign, an arbitrary-precision integer coefficient
|
||||
// value, and a signed fixed-precision exponent value.
|
||||
// The sign and the coefficient value are handled together as a signed value
|
||||
// and referred to as the unscaled value.
|
||||
// (Positive and negative zero values are not distinguished.)
|
||||
// Since the exponent is most commonly non-positive, it is handled in negated
|
||||
// form and referred to as scale.
|
||||
//
|
||||
// The mathematical value of a Dec equals:
|
||||
//
|
||||
// unscaled * 10**(-scale)
|
||||
//
|
||||
// Note that different Dec representations may have equal mathematical values.
|
||||
//
|
||||
// unscaled scale String()
|
||||
// -------------------------
|
||||
// 0 0 "0"
|
||||
// 0 2 "0.00"
|
||||
// 0 -2 "0"
|
||||
// 1 0 "1"
|
||||
// 100 2 "1.00"
|
||||
// 10 0 "10"
|
||||
// 1 -1 "10"
|
||||
//
|
||||
// The zero value for a Dec represents the value 0 with scale 0.
|
||||
//
|
||||
// Operations are typically performed through the *Dec type.
|
||||
// The semantics of the assignment operation "=" for "bare" Dec values is
|
||||
// undefined and should not be relied on.
|
||||
//
|
||||
// Methods are typically of the form:
|
||||
//
|
||||
// func (z *Dec) Op(x, y *Dec) *Dec
|
||||
//
|
||||
// and implement operations z = x Op y with the result as receiver; if it
|
||||
// is one of the operands it may be overwritten (and its memory reused).
|
||||
// To enable chaining of operations, the result is also returned. Methods
|
||||
// returning a result other than *Dec take one of the operands as the receiver.
|
||||
//
|
||||
// A "bare" Quo method (quotient / division operation) is not provided, as the
|
||||
// result is not always a finite decimal and thus in general cannot be
|
||||
// represented as a Dec.
|
||||
// Instead, in the common case when rounding is (potentially) necessary,
|
||||
// QuoRound should be used with a Scale and a Rounder.
|
||||
// QuoExact or QuoRound with RoundExact can be used in the special cases when it
|
||||
// is known that the result is always a finite decimal.
|
||||
//
|
||||
type Dec struct {
|
||||
unscaled big.Int
|
||||
scale Scale
|
||||
}
|
||||
|
||||
// Scale represents the type used for the scale of a Dec.
|
||||
type Scale int32
|
||||
|
||||
const scaleSize = 4 // bytes in a Scale value
|
||||
|
||||
// Scaler represents a method for obtaining the scale to use for the result of
|
||||
// an operation on x and y.
|
||||
type scaler interface {
|
||||
Scale(x *Dec, y *Dec) Scale
|
||||
}
|
||||
|
||||
var bigInt = [...]*big.Int{
|
||||
big.NewInt(0), big.NewInt(1), big.NewInt(2), big.NewInt(3), big.NewInt(4),
|
||||
big.NewInt(5), big.NewInt(6), big.NewInt(7), big.NewInt(8), big.NewInt(9),
|
||||
big.NewInt(10),
|
||||
}
|
||||
|
||||
var exp10cache [64]big.Int = func() [64]big.Int {
|
||||
e10, e10i := [64]big.Int{}, bigInt[1]
|
||||
for i, _ := range e10 {
|
||||
e10[i].Set(e10i)
|
||||
e10i = new(big.Int).Mul(e10i, bigInt[10])
|
||||
}
|
||||
return e10
|
||||
}()
|
||||
|
||||
// NewDec allocates and returns a new Dec set to the given int64 unscaled value
|
||||
// and scale.
|
||||
func NewDec(unscaled int64, scale Scale) *Dec {
|
||||
return new(Dec).SetUnscaled(unscaled).SetScale(scale)
|
||||
}
|
||||
|
||||
// NewDecBig allocates and returns a new Dec set to the given *big.Int unscaled
|
||||
// value and scale.
|
||||
func NewDecBig(unscaled *big.Int, scale Scale) *Dec {
|
||||
return new(Dec).SetUnscaledBig(unscaled).SetScale(scale)
|
||||
}
|
||||
|
||||
// Scale returns the scale of x.
|
||||
func (x *Dec) Scale() Scale {
|
||||
return x.scale
|
||||
}
|
||||
|
||||
// Unscaled returns the unscaled value of x for u and true for ok when the
|
||||
// unscaled value can be represented as int64; otherwise it returns an undefined
|
||||
// int64 value for u and false for ok. Use x.UnscaledBig().Int64() to avoid
|
||||
// checking the validity of the value when the check is known to be redundant.
|
||||
func (x *Dec) Unscaled() (u int64, ok bool) {
|
||||
u = x.unscaled.Int64()
|
||||
var i big.Int
|
||||
ok = i.SetInt64(u).Cmp(&x.unscaled) == 0
|
||||
return
|
||||
}
|
||||
|
||||
// UnscaledBig returns the unscaled value of x as *big.Int.
|
||||
func (x *Dec) UnscaledBig() *big.Int {
|
||||
return &x.unscaled
|
||||
}
|
||||
|
||||
// SetScale sets the scale of z, with the unscaled value unchanged, and returns
|
||||
// z.
|
||||
// The mathematical value of the Dec changes as if it was multiplied by
|
||||
// 10**(oldscale-scale).
|
||||
func (z *Dec) SetScale(scale Scale) *Dec {
|
||||
z.scale = scale
|
||||
return z
|
||||
}
|
||||
|
||||
// SetUnscaled sets the unscaled value of z, with the scale unchanged, and
|
||||
// returns z.
|
||||
func (z *Dec) SetUnscaled(unscaled int64) *Dec {
|
||||
z.unscaled.SetInt64(unscaled)
|
||||
return z
|
||||
}
|
||||
|
||||
// SetUnscaledBig sets the unscaled value of z, with the scale unchanged, and
|
||||
// returns z.
|
||||
func (z *Dec) SetUnscaledBig(unscaled *big.Int) *Dec {
|
||||
z.unscaled.Set(unscaled)
|
||||
return z
|
||||
}
|
||||
|
||||
// Set sets z to the value of x and returns z.
|
||||
// It does nothing if z == x.
|
||||
func (z *Dec) Set(x *Dec) *Dec {
|
||||
if z != x {
|
||||
z.SetUnscaledBig(x.UnscaledBig())
|
||||
z.SetScale(x.Scale())
|
||||
}
|
||||
return z
|
||||
}
|
||||
|
||||
// Sign returns:
|
||||
//
|
||||
// -1 if x < 0
|
||||
// 0 if x == 0
|
||||
// +1 if x > 0
|
||||
//
|
||||
func (x *Dec) Sign() int {
|
||||
return x.UnscaledBig().Sign()
|
||||
}
|
||||
|
||||
// Neg sets z to -x and returns z.
|
||||
func (z *Dec) Neg(x *Dec) *Dec {
|
||||
z.SetScale(x.Scale())
|
||||
z.UnscaledBig().Neg(x.UnscaledBig())
|
||||
return z
|
||||
}
|
||||
|
||||
// Cmp compares x and y and returns:
|
||||
//
|
||||
// -1 if x < y
|
||||
// 0 if x == y
|
||||
// +1 if x > y
|
||||
//
|
||||
func (x *Dec) Cmp(y *Dec) int {
|
||||
xx, yy := upscale(x, y)
|
||||
return xx.UnscaledBig().Cmp(yy.UnscaledBig())
|
||||
}
|
||||
|
||||
// Abs sets z to |x| (the absolute value of x) and returns z.
|
||||
func (z *Dec) Abs(x *Dec) *Dec {
|
||||
z.SetScale(x.Scale())
|
||||
z.UnscaledBig().Abs(x.UnscaledBig())
|
||||
return z
|
||||
}
|
||||
|
||||
// Add sets z to the sum x+y and returns z.
|
||||
// The scale of z is the greater of the scales of x and y.
|
||||
func (z *Dec) Add(x, y *Dec) *Dec {
|
||||
xx, yy := upscale(x, y)
|
||||
z.SetScale(xx.Scale())
|
||||
z.UnscaledBig().Add(xx.UnscaledBig(), yy.UnscaledBig())
|
||||
return z
|
||||
}
|
||||
|
||||
// Sub sets z to the difference x-y and returns z.
|
||||
// The scale of z is the greater of the scales of x and y.
|
||||
func (z *Dec) Sub(x, y *Dec) *Dec {
|
||||
xx, yy := upscale(x, y)
|
||||
z.SetScale(xx.Scale())
|
||||
z.UnscaledBig().Sub(xx.UnscaledBig(), yy.UnscaledBig())
|
||||
return z
|
||||
}
|
||||
|
||||
// Mul sets z to the product x*y and returns z.
|
||||
// The scale of z is the sum of the scales of x and y.
|
||||
func (z *Dec) Mul(x, y *Dec) *Dec {
|
||||
z.SetScale(x.Scale() + y.Scale())
|
||||
z.UnscaledBig().Mul(x.UnscaledBig(), y.UnscaledBig())
|
||||
return z
|
||||
}
|
||||
|
||||
// Round sets z to the value of x rounded to Scale s using Rounder r, and
|
||||
// returns z.
|
||||
func (z *Dec) Round(x *Dec, s Scale, r Rounder) *Dec {
|
||||
return z.QuoRound(x, NewDec(1, 0), s, r)
|
||||
}
|
||||
|
||||
// QuoRound sets z to the quotient x/y, rounded using the given Rounder to the
|
||||
// specified scale.
|
||||
//
|
||||
// If the rounder is RoundExact but the result can not be expressed exactly at
|
||||
// the specified scale, QuoRound returns nil, and the value of z is undefined.
|
||||
//
|
||||
// There is no corresponding Div method; the equivalent can be achieved through
|
||||
// the choice of Rounder used.
|
||||
//
|
||||
func (z *Dec) QuoRound(x, y *Dec, s Scale, r Rounder) *Dec {
|
||||
return z.quo(x, y, sclr{s}, r)
|
||||
}
|
||||
|
||||
func (z *Dec) quo(x, y *Dec, s scaler, r Rounder) *Dec {
|
||||
scl := s.Scale(x, y)
|
||||
var zzz *Dec
|
||||
if r.UseRemainder() {
|
||||
zz, rA, rB := new(Dec).quoRem(x, y, scl, true, new(big.Int), new(big.Int))
|
||||
zzz = r.Round(new(Dec), zz, rA, rB)
|
||||
} else {
|
||||
zz, _, _ := new(Dec).quoRem(x, y, scl, false, nil, nil)
|
||||
zzz = r.Round(new(Dec), zz, nil, nil)
|
||||
}
|
||||
if zzz == nil {
|
||||
return nil
|
||||
}
|
||||
return z.Set(zzz)
|
||||
}
|
||||
|
||||
// QuoExact sets z to the quotient x/y and returns z when x/y is a finite
|
||||
// decimal. Otherwise it returns nil and the value of z is undefined.
|
||||
//
|
||||
// The scale of a non-nil result is "x.Scale() - y.Scale()" or greater; it is
|
||||
// calculated so that the remainder will be zero whenever x/y is a finite
|
||||
// decimal.
|
||||
func (z *Dec) QuoExact(x, y *Dec) *Dec {
|
||||
return z.quo(x, y, scaleQuoExact{}, RoundExact)
|
||||
}
|
||||
|
||||
// quoRem sets z to the quotient x/y with the scale s, and if useRem is true,
|
||||
// it sets remNum and remDen to the numerator and denominator of the remainder.
|
||||
// It returns z, remNum and remDen.
|
||||
//
|
||||
// The remainder is normalized to the range -1 < r < 1 to simplify rounding;
|
||||
// that is, the results satisfy the following equation:
|
||||
//
|
||||
// x / y = z + (remNum/remDen) * 10**(-z.Scale())
|
||||
//
|
||||
// See Rounder for more details about rounding.
|
||||
//
|
||||
func (z *Dec) quoRem(x, y *Dec, s Scale, useRem bool,
|
||||
remNum, remDen *big.Int) (*Dec, *big.Int, *big.Int) {
|
||||
// difference (required adjustment) compared to "canonical" result scale
|
||||
shift := s - (x.Scale() - y.Scale())
|
||||
// pointers to adjusted unscaled dividend and divisor
|
||||
var ix, iy *big.Int
|
||||
switch {
|
||||
case shift > 0:
|
||||
// increased scale: decimal-shift dividend left
|
||||
ix = new(big.Int).Mul(x.UnscaledBig(), exp10(shift))
|
||||
iy = y.UnscaledBig()
|
||||
case shift < 0:
|
||||
// decreased scale: decimal-shift divisor left
|
||||
ix = x.UnscaledBig()
|
||||
iy = new(big.Int).Mul(y.UnscaledBig(), exp10(-shift))
|
||||
default:
|
||||
ix = x.UnscaledBig()
|
||||
iy = y.UnscaledBig()
|
||||
}
|
||||
// save a copy of iy in case it to be overwritten with the result
|
||||
iy2 := iy
|
||||
if iy == z.UnscaledBig() {
|
||||
iy2 = new(big.Int).Set(iy)
|
||||
}
|
||||
// set scale
|
||||
z.SetScale(s)
|
||||
// set unscaled
|
||||
if useRem {
|
||||
// Int division
|
||||
_, intr := z.UnscaledBig().QuoRem(ix, iy, new(big.Int))
|
||||
// set remainder
|
||||
remNum.Set(intr)
|
||||
remDen.Set(iy2)
|
||||
} else {
|
||||
z.UnscaledBig().Quo(ix, iy)
|
||||
}
|
||||
return z, remNum, remDen
|
||||
}
|
||||
|
||||
type sclr struct{ s Scale }
|
||||
|
||||
func (s sclr) Scale(x, y *Dec) Scale {
|
||||
return s.s
|
||||
}
|
||||
|
||||
type scaleQuoExact struct{}
|
||||
|
||||
func (sqe scaleQuoExact) Scale(x, y *Dec) Scale {
|
||||
rem := new(big.Rat).SetFrac(x.UnscaledBig(), y.UnscaledBig())
|
||||
f2, f5 := factor2(rem.Denom()), factor(rem.Denom(), bigInt[5])
|
||||
var f10 Scale
|
||||
if f2 > f5 {
|
||||
f10 = Scale(f2)
|
||||
} else {
|
||||
f10 = Scale(f5)
|
||||
}
|
||||
return x.Scale() - y.Scale() + f10
|
||||
}
|
||||
|
||||
func factor(n *big.Int, p *big.Int) int {
|
||||
// could be improved for large factors
|
||||
d, f := n, 0
|
||||
for {
|
||||
dd, dm := new(big.Int).DivMod(d, p, new(big.Int))
|
||||
if dm.Sign() == 0 {
|
||||
f++
|
||||
d = dd
|
||||
} else {
|
||||
break
|
||||
}
|
||||
}
|
||||
return f
|
||||
}
|
||||
|
||||
func factor2(n *big.Int) int {
|
||||
// could be improved for large factors
|
||||
f := 0
|
||||
for ; n.Bit(f) == 0; f++ {
|
||||
}
|
||||
return f
|
||||
}
|
||||
|
||||
func upscale(a, b *Dec) (*Dec, *Dec) {
|
||||
if a.Scale() == b.Scale() {
|
||||
return a, b
|
||||
}
|
||||
if a.Scale() > b.Scale() {
|
||||
bb := b.rescale(a.Scale())
|
||||
return a, bb
|
||||
}
|
||||
aa := a.rescale(b.Scale())
|
||||
return aa, b
|
||||
}
|
||||
|
||||
func exp10(x Scale) *big.Int {
|
||||
if int(x) < len(exp10cache) {
|
||||
return &exp10cache[int(x)]
|
||||
}
|
||||
return new(big.Int).Exp(bigInt[10], big.NewInt(int64(x)), nil)
|
||||
}
|
||||
|
||||
func (x *Dec) rescale(newScale Scale) *Dec {
|
||||
shift := newScale - x.Scale()
|
||||
switch {
|
||||
case shift < 0:
|
||||
e := exp10(-shift)
|
||||
return NewDecBig(new(big.Int).Quo(x.UnscaledBig(), e), newScale)
|
||||
case shift > 0:
|
||||
e := exp10(shift)
|
||||
return NewDecBig(new(big.Int).Mul(x.UnscaledBig(), e), newScale)
|
||||
}
|
||||
return x
|
||||
}
|
||||
|
||||
var zeros = []byte("00000000000000000000000000000000" +
|
||||
"00000000000000000000000000000000")
|
||||
var lzeros = Scale(len(zeros))
|
||||
|
||||
func appendZeros(s []byte, n Scale) []byte {
|
||||
for i := Scale(0); i < n; i += lzeros {
|
||||
if n > i+lzeros {
|
||||
s = append(s, zeros...)
|
||||
} else {
|
||||
s = append(s, zeros[0:n-i]...)
|
||||
}
|
||||
}
|
||||
return s
|
||||
}
|
||||
|
||||
func (x *Dec) String() string {
|
||||
if x == nil {
|
||||
return "<nil>"
|
||||
}
|
||||
scale := x.Scale()
|
||||
s := []byte(x.UnscaledBig().String())
|
||||
if scale <= 0 {
|
||||
if scale != 0 && x.unscaled.Sign() != 0 {
|
||||
s = appendZeros(s, -scale)
|
||||
}
|
||||
return string(s)
|
||||
}
|
||||
negbit := Scale(-((x.Sign() - 1) / 2))
|
||||
// scale > 0
|
||||
lens := Scale(len(s))
|
||||
if lens-negbit <= scale {
|
||||
ss := make([]byte, 0, scale+2)
|
||||
if negbit == 1 {
|
||||
ss = append(ss, '-')
|
||||
}
|
||||
ss = append(ss, '0', '.')
|
||||
ss = appendZeros(ss, scale-lens+negbit)
|
||||
ss = append(ss, s[negbit:]...)
|
||||
return string(ss)
|
||||
}
|
||||
// lens > scale
|
||||
ss := make([]byte, 0, lens+1)
|
||||
ss = append(ss, s[:lens-scale]...)
|
||||
ss = append(ss, '.')
|
||||
ss = append(ss, s[lens-scale:]...)
|
||||
return string(ss)
|
||||
}
|
||||
|
||||
// Format is a support routine for fmt.Formatter. It accepts the decimal
|
||||
// formats 'd' and 'f', and handles both equivalently.
|
||||
// Width, precision, flags and bases 2, 8, 16 are not supported.
|
||||
func (x *Dec) Format(s fmt.State, ch rune) {
|
||||
if ch != 'd' && ch != 'f' && ch != 'v' && ch != 's' {
|
||||
fmt.Fprintf(s, "%%!%c(dec.Dec=%s)", ch, x.String())
|
||||
return
|
||||
}
|
||||
fmt.Fprintf(s, x.String())
|
||||
}
|
||||
|
||||
func (z *Dec) scan(r io.RuneScanner) (*Dec, error) {
|
||||
unscaled := make([]byte, 0, 256) // collects chars of unscaled as bytes
|
||||
dp, dg := -1, -1 // indexes of decimal point, first digit
|
||||
loop:
|
||||
for {
|
||||
ch, _, err := r.ReadRune()
|
||||
if err == io.EOF {
|
||||
break loop
|
||||
}
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
switch {
|
||||
case ch == '+' || ch == '-':
|
||||
if len(unscaled) > 0 || dp >= 0 { // must be first character
|
||||
r.UnreadRune()
|
||||
break loop
|
||||
}
|
||||
case ch == '.':
|
||||
if dp >= 0 {
|
||||
r.UnreadRune()
|
||||
break loop
|
||||
}
|
||||
dp = len(unscaled)
|
||||
continue // don't add to unscaled
|
||||
case ch >= '0' && ch <= '9':
|
||||
if dg == -1 {
|
||||
dg = len(unscaled)
|
||||
}
|
||||
default:
|
||||
r.UnreadRune()
|
||||
break loop
|
||||
}
|
||||
unscaled = append(unscaled, byte(ch))
|
||||
}
|
||||
if dg == -1 {
|
||||
return nil, fmt.Errorf("no digits read")
|
||||
}
|
||||
if dp >= 0 {
|
||||
z.SetScale(Scale(len(unscaled) - dp))
|
||||
} else {
|
||||
z.SetScale(0)
|
||||
}
|
||||
_, ok := z.UnscaledBig().SetString(string(unscaled), 10)
|
||||
if !ok {
|
||||
return nil, fmt.Errorf("invalid decimal: %s", string(unscaled))
|
||||
}
|
||||
return z, nil
|
||||
}
|
||||
|
||||
// SetString sets z to the value of s, interpreted as a decimal (base 10),
|
||||
// and returns z and a boolean indicating success. The scale of z is the
|
||||
// number of digits after the decimal point (including any trailing 0s),
|
||||
// or 0 if there is no decimal point. If SetString fails, the value of z
|
||||
// is undefined but the returned value is nil.
|
||||
func (z *Dec) SetString(s string) (*Dec, bool) {
|
||||
r := strings.NewReader(s)
|
||||
_, err := z.scan(r)
|
||||
if err != nil {
|
||||
return nil, false
|
||||
}
|
||||
_, _, err = r.ReadRune()
|
||||
if err != io.EOF {
|
||||
return nil, false
|
||||
}
|
||||
// err == io.EOF => scan consumed all of s
|
||||
return z, true
|
||||
}
|
||||
|
||||
// Scan is a support routine for fmt.Scanner; it sets z to the value of
|
||||
// the scanned number. It accepts the decimal formats 'd' and 'f', and
|
||||
// handles both equivalently. Bases 2, 8, 16 are not supported.
|
||||
// The scale of z is the number of digits after the decimal point
|
||||
// (including any trailing 0s), or 0 if there is no decimal point.
|
||||
func (z *Dec) Scan(s fmt.ScanState, ch rune) error {
|
||||
if ch != 'd' && ch != 'f' && ch != 's' && ch != 'v' {
|
||||
return fmt.Errorf("Dec.Scan: invalid verb '%c'", ch)
|
||||
}
|
||||
s.SkipSpace()
|
||||
_, err := z.scan(s)
|
||||
return err
|
||||
}
|
||||
|
||||
// Gob encoding version
|
||||
const decGobVersion byte = 1
|
||||
|
||||
func scaleBytes(s Scale) []byte {
|
||||
buf := make([]byte, scaleSize)
|
||||
i := scaleSize
|
||||
for j := 0; j < scaleSize; j++ {
|
||||
i--
|
||||
buf[i] = byte(s)
|
||||
s >>= 8
|
||||
}
|
||||
return buf
|
||||
}
|
||||
|
||||
func scale(b []byte) (s Scale) {
|
||||
for j := 0; j < scaleSize; j++ {
|
||||
s <<= 8
|
||||
s |= Scale(b[j])
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// GobEncode implements the gob.GobEncoder interface.
|
||||
func (x *Dec) GobEncode() ([]byte, error) {
|
||||
buf, err := x.UnscaledBig().GobEncode()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
buf = append(append(buf, scaleBytes(x.Scale())...), decGobVersion)
|
||||
return buf, nil
|
||||
}
|
||||
|
||||
// GobDecode implements the gob.GobDecoder interface.
|
||||
func (z *Dec) GobDecode(buf []byte) error {
|
||||
if len(buf) == 0 {
|
||||
return fmt.Errorf("Dec.GobDecode: no data")
|
||||
}
|
||||
b := buf[len(buf)-1]
|
||||
if b != decGobVersion {
|
||||
return fmt.Errorf("Dec.GobDecode: encoding version %d not supported", b)
|
||||
}
|
||||
l := len(buf) - scaleSize - 1
|
||||
err := z.UnscaledBig().GobDecode(buf[:l])
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
z.SetScale(scale(buf[l : l+scaleSize]))
|
||||
return nil
|
||||
}
|
||||
|
||||
// MarshalText implements the encoding.TextMarshaler interface.
|
||||
func (x *Dec) MarshalText() ([]byte, error) {
|
||||
return []byte(x.String()), nil
|
||||
}
|
||||
|
||||
// UnmarshalText implements the encoding.TextUnmarshaler interface.
|
||||
func (z *Dec) UnmarshalText(data []byte) error {
|
||||
_, ok := z.SetString(string(data))
|
||||
if !ok {
|
||||
return fmt.Errorf("invalid inf.Dec")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
Reference in New Issue
Block a user