Gecko [ 167.86.127.34 ]

Name	Size	Permission
accuracy_string.go	414 B	-rw-r--r--
arith.go	5.68 KB	-rw-r--r--
arith_386.s	4.67 KB	-rw-r--r--
arith_amd64.go	277 B	-rw-r--r--
arith_amd64.s	9.71 KB	-rw-r--r--
arith_arm.s	4.47 KB	-rw-r--r--
arith_arm64.s	9.94 KB	-rw-r--r--
arith_decl.go	707 B	-rw-r--r--
arith_decl_pure.go	1.24 KB	-rw-r--r--
arith_decl_s390x.go	791 B	-rw-r--r--
arith_mips64x.s	917 B	-rw-r--r--
arith_mipsx.s	913 B	-rw-r--r--
arith_ppc64x.s	12.62 KB	-rw-r--r--
arith_s390x.s	29.12 KB	-rw-r--r--
arith_s390x_test.go	1014 B	-rw-r--r--
arith_test.go	12.29 KB	-rw-r--r--
arith_wasm.s	757 B	-rw-r--r--
bits_test.go	5.07 KB	-rw-r--r--
calibrate_test.go	4.63 KB	-rw-r--r--
decimal.go	6.52 KB	-rw-r--r--
decimal_test.go	3.33 KB	-rw-r--r--
doc.go	3.79 KB	-rw-r--r--
example_rat_test.go	1.68 KB	-rw-r--r--
example_test.go	3.94 KB	-rw-r--r--
float.go	44.14 KB	-rw-r--r--
float_test.go	51.94 KB	-rw-r--r--
floatconv.go	8.36 KB	-rw-r--r--
floatconv_test.go	24.28 KB	-rw-r--r--
floatexample_test.go	3.63 KB	-rw-r--r--
floatmarsh.go	3.34 KB	-rw-r--r--
floatmarsh_test.go	3.64 KB	-rw-r--r--
ftoa.go	13.55 KB	-rw-r--r--
gcd_test.go	2.16 KB	-rw-r--r--
hilbert_test.go	2.88 KB	-rw-r--r--
int.go	29.56 KB	-rw-r--r--
int_test.go	51.93 KB	-rw-r--r--
intconv.go	6.68 KB	-rw-r--r--
intconv_test.go	10.01 KB	-rw-r--r--
intmarsh.go	2.09 KB	-rw-r--r--
intmarsh_test.go	2.8 KB	-rw-r--r--
nat.go	33.76 KB	-rw-r--r--
nat_test.go	18.87 KB	-rw-r--r--
natconv.go	14.57 KB	-rw-r--r--
natconv_test.go	16.85 KB	-rw-r--r--
prime.go	10.34 KB	-rw-r--r--
prime_test.go	7.1 KB	-rw-r--r--
rat.go	13.49 KB	-rw-r--r--
rat_test.go	18.54 KB	-rw-r--r--
ratconv.go	9.49 KB	-rw-r--r--
ratconv_test.go	14.96 KB	-rw-r--r--
ratmarsh.go	1.95 KB	-rw-r--r--
ratmarsh_test.go	3.04 KB	-rw-r--r--
roundingmode_string.go	501 B	-rw-r--r--
sqrt.go	3.59 KB	-rw-r--r--
sqrt_test.go	4.81 KB	-rw-r--r--

Code Editor : floatmarsh.go

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This file implements encoding/decoding of Floats.

package big

import (
	"encoding/binary"
	"fmt"
)

// Gob codec version. Permits backward-compatible changes to the encoding.
const floatGobVersion byte = 1

// GobEncode implements the gob.GobEncoder interface.
// The Float value and all its attributes (precision,
// rounding mode, accuracy) are marshaled.
func (x *Float) GobEncode() ([]byte, error) {
	if x == nil {
		return nil, nil
	}

// determine max. space (bytes) required for encoding
	sz := 1 + 1 + 4 // version + mode|acc|form|neg (3+2+2+1bit) + prec
	n := 0          // number of mantissa words
	if x.form == finite {
		// add space for mantissa and exponent
		n = int((x.prec + (_W - 1)) / _W) // required mantissa length in words for given precision
		// actual mantissa slice could be shorter (trailing 0's) or longer (unused bits):
		// - if shorter, only encode the words present
		// - if longer, cut off unused words when encoding in bytes
		//   (in practice, this should never happen since rounding
		//   takes care of it, but be safe and do it always)
		if len(x.mant) < n {
			n = len(x.mant)
		}
		// len(x.mant) >= n
		sz += 4 + n*_S // exp + mant
	}
	buf := make([]byte, sz)

buf[0] = floatGobVersion
	b := byte(x.mode&7)<<5 | byte((x.acc+1)&3)<<3 | byte(x.form&3)<<1
	if x.neg {
		b |= 1
	}
	buf[1] = b
	binary.BigEndian.PutUint32(buf[2:], x.prec)

if x.form == finite {
		binary.BigEndian.PutUint32(buf[6:], uint32(x.exp))
		x.mant[len(x.mant)-n:].bytes(buf[10:]) // cut off unused trailing words
	}

return buf, nil
}

// GobDecode implements the gob.GobDecoder interface.
// The result is rounded per the precision and rounding mode of
// z unless z's precision is 0, in which case z is set exactly
// to the decoded value.
func (z *Float) GobDecode(buf []byte) error {
	if len(buf) == 0 {
		// Other side sent a nil or default value.
		*z = Float{}
		return nil
	}

if buf[0] != floatGobVersion {
		return fmt.Errorf("Float.GobDecode: encoding version %d not supported", buf[0])
	}

oldPrec := z.prec
	oldMode := z.mode

b := buf[1]
	z.mode = RoundingMode((b >> 5) & 7)
	z.acc = Accuracy((b>>3)&3) - 1
	z.form = form((b >> 1) & 3)
	z.neg = b&1 != 0
	z.prec = binary.BigEndian.Uint32(buf[2:])

if z.form == finite {
		z.exp = int32(binary.BigEndian.Uint32(buf[6:]))
		z.mant = z.mant.setBytes(buf[10:])
	}

if oldPrec != 0 {
		z.mode = oldMode
		z.SetPrec(uint(oldPrec))
	}

return nil
}

// MarshalText implements the encoding.TextMarshaler interface.
// Only the Float value is marshaled (in full precision), other
// attributes such as precision or accuracy are ignored.
func (x *Float) MarshalText() (text []byte, err error) {
	if x == nil {
		return []byte("<nil>"), nil
	}
	var buf []byte
	return x.Append(buf, 'g', -1), nil
}

// UnmarshalText implements the encoding.TextUnmarshaler interface.
// The result is rounded per the precision and rounding mode of z.
// If z's precision is 0, it is changed to 64 before rounding takes
// effect.
func (z *Float) UnmarshalText(text []byte) error {
	// TODO(gri): get rid of the []byte/string conversion
	_, _, err := z.Parse(string(text), 0)
	if err != nil {
		err = fmt.Errorf("math/big: cannot unmarshal %q into a *big.Float (%v)", text, err)
	}
	return err
}

${this.title}

Code Editor : floatmarsh.go