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// 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 Rats.
package big
import (
"encoding/binary"
"errors"
"fmt"
"math"
)
// Gob codec version. Permits backward-compatible changes to the encoding.
const ratGobVersion byte = 1
// GobEncode implements the [encoding/gob.GobEncoder] interface.
func (x *Rat) GobEncode() ([]byte, error) {
if x == nil {
return nil, nil
}
buf := make([]byte, 1+4+(len(x.a.abs)+len(x.b.abs))*_S) // extra bytes for version and sign bit (1), and numerator length (4)
i := x.b.abs.bytes(buf)
j := x.a.abs.bytes(buf[:i])
n := i - j
if int(uint32(n)) != n {
// this should never happen
return nil, errors.New("Rat.GobEncode: numerator too large")
}
binary.BigEndian.PutUint32(buf[j-4:j], uint32(n))
j -= 1 + 4
b := ratGobVersion << 1 // make space for sign bit
if x.a.neg {
b |= 1
}
buf[j] = b
return buf[j:], nil
}
// GobDecode implements the [encoding/gob.GobDecoder] interface.
func (z *Rat) GobDecode(buf []byte) error {
if len(buf) == 0 {
// Other side sent a nil or default value.
*z = Rat{}
return nil
}
if len(buf) < 5 {
return errors.New("Rat.GobDecode: buffer too small")
}
b := buf[0]
if b>>1 != ratGobVersion {
return fmt.Errorf("Rat.GobDecode: encoding version %d not supported", b>>1)
}
const j = 1 + 4
ln := binary.BigEndian.Uint32(buf[j-4 : j])
if uint64(ln) > math.MaxInt-j {
return errors.New("Rat.GobDecode: invalid length")
}
i := j + int(ln)
if len(buf) < i {
return errors.New("Rat.GobDecode: buffer too small")
}
z.a.neg = b&1 != 0
z.a.abs = z.a.abs.setBytes(buf[j:i])
z.b.abs = z.b.abs.setBytes(buf[i:])
return nil
}
// MarshalText implements the [encoding.TextMarshaler] interface.
func (x *Rat) MarshalText() (text []byte, err error) {
if x.IsInt() {
return x.a.MarshalText()
}
return x.marshal(), nil
}
// UnmarshalText implements the [encoding.TextUnmarshaler] interface.
func (z *Rat) UnmarshalText(text []byte) error {
// TODO(gri): get rid of the []byte/string conversion
if _, ok := z.SetString(string(text)); !ok {
return fmt.Errorf("math/big: cannot unmarshal %q into a *big.Rat", text)
}
return nil
}