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📁 ..
📄 accuracy_string.go(647 B)
📄 alias_test.go(8.81 KB)
📄 arith.go(8.28 KB)
📄 arith_386.s(4.04 KB)
📄 arith_amd64.go(278 B)
📄 arith_amd64.s(9.07 KB)
📄 arith_arm.s(4 KB)
📄 arith_arm64.s(11.85 KB)
📄 arith_decl.go(686 B)
📄 arith_decl_pure.go(1.01 KB)
📄 arith_decl_s390x.go(503 B)
📄 arith_loong64.s(749 B)
📄 arith_mips64x.s(763 B)
📄 arith_mipsx.s(759 B)
📄 arith_ppc64x.s(16.4 KB)
📄 arith_riscv64.s(750 B)
📄 arith_s390x.s(20.29 KB)
📄 arith_s390x_test.go(770 B)
📄 arith_test.go(19.88 KB)
📄 arith_wasm.s(613 B)
📄 bits_test.go(5.07 KB)
📄 calibrate_test.go(4.63 KB)
📄 decimal.go(6.63 KB)
📄 decimal_test.go(3.33 KB)
📄 doc.go(3.8 KB)
📄 example_rat_test.go(1.68 KB)
📄 example_test.go(4.05 KB)
📄 float.go(44.55 KB)
📄 float_test.go(51.94 KB)
📄 floatconv.go(8.35 KB)
📄 floatconv_test.go(24.27 KB)
📄 floatexample_test.go(3.63 KB)
📄 floatmarsh.go(3.65 KB)
📄 floatmarsh_test.go(4.51 KB)
📄 ftoa.go(13.5 KB)
📄 gcd_test.go(2.16 KB)
📄 hilbert_test.go(2.88 KB)
📄 int.go(33.21 KB)
📄 int_test.go(58.47 KB)
📄 intconv.go(6.7 KB)
📄 intconv_test.go(10.01 KB)
📄 intmarsh.go(2.19 KB)
📄 intmarsh_test.go(3.07 KB)
📄 link_test.go(1.4 KB)
📄 nat.go(31.81 KB)
📄 nat_test.go(26.22 KB)
📄 natconv.go(14.56 KB)
📄 natconv_test.go(16.85 KB)
📄 natdiv.go(34.36 KB)
📄 prime.go(10.39 KB)
📄 prime_test.go(7.1 KB)
📄 rat.go(13.48 KB)
📄 rat_test.go(18.89 KB)
📄 ratconv.go(12.35 KB)
📄 ratconv_test.go(19.31 KB)
📄 ratmarsh.go(2.23 KB)
📄 ratmarsh_test.go(3.34 KB)
📄 roundingmode_string.go(819 B)
📄 sqrt.go(2.79 KB)
📄 sqrt_test.go(4.81 KB)

Editing: 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"
	"errors"
	"fmt"
)

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

// GobEncode implements the [encoding/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 [encoding/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 len(buf) < 6 {
		return errors.New("Float.GobDecode: buffer too small")
	}

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 {
		if len(buf) < 10 {
			return errors.New("Float.GobDecode: buffer too small for finite form float")
		}
		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))
	}

if msg := z.validate0(); msg != "" {
		return errors.New("Float.GobDecode: " + msg)
	}

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
}

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Editing: floatmarsh.go

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