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math/big: move Int/Rat gob/json/xml functionality in separate files
Like int/rat/float conversions, move this functionality into separate implementation and test files. No implementation changes besides the move. Change-Id: If19c45f5a72a57b95cbce2329724693ae5a4807d Reviewed-on: https://go-review.googlesource.com/14997 Reviewed-by: Alan Donovan <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| // 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. | ||
|
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| // This file implements encoding/decoding of Ints. | ||
|
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| package big | ||
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| import "fmt" | ||
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| // Gob codec version. Permits backward-compatible changes to the encoding. | ||
| const intGobVersion byte = 1 | ||
|
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| // GobEncode implements the gob.GobEncoder interface. | ||
| func (x *Int) GobEncode() ([]byte, error) { | ||
| if x == nil { | ||
| return nil, nil | ||
| } | ||
| buf := make([]byte, 1+len(x.abs)*_S) // extra byte for version and sign bit | ||
| i := x.abs.bytes(buf) - 1 // i >= 0 | ||
| b := intGobVersion << 1 // make space for sign bit | ||
| if x.neg { | ||
| b |= 1 | ||
| } | ||
| buf[i] = b | ||
| return buf[i:], nil | ||
| } | ||
|
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| // GobDecode implements the gob.GobDecoder interface. | ||
| func (z *Int) GobDecode(buf []byte) error { | ||
| if len(buf) == 0 { | ||
| // Other side sent a nil or default value. | ||
| *z = Int{} | ||
| return nil | ||
| } | ||
| b := buf[0] | ||
| if b>>1 != intGobVersion { | ||
| return fmt.Errorf("Int.GobDecode: encoding version %d not supported", b>>1) | ||
| } | ||
| z.neg = b&1 != 0 | ||
| z.abs = z.abs.setBytes(buf[1:]) | ||
| return nil | ||
| } | ||
|
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| // MarshalJSON implements the json.Marshaler interface. | ||
| func (z *Int) MarshalJSON() ([]byte, error) { | ||
| // TODO(gri): get rid of the []byte/string conversions | ||
| return []byte(z.String()), nil | ||
| } | ||
|
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| // UnmarshalJSON implements the json.Unmarshaler interface. | ||
| func (z *Int) UnmarshalJSON(text []byte) error { | ||
| // TODO(gri): get rid of the []byte/string conversions | ||
| if _, ok := z.SetString(string(text), 0); !ok { | ||
| return fmt.Errorf("math/big: cannot unmarshal %q into a *big.Int", text) | ||
| } | ||
| return nil | ||
| } | ||
|
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| // MarshalText implements the encoding.TextMarshaler interface. | ||
| func (z *Int) MarshalText() (text []byte, err error) { | ||
| return []byte(z.String()), nil | ||
| } | ||
|
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| // UnmarshalText implements the encoding.TextUnmarshaler interface. | ||
| func (z *Int) UnmarshalText(text []byte) error { | ||
| if _, ok := z.SetString(string(text), 0); !ok { | ||
| return fmt.Errorf("math/big: cannot unmarshal %q into a *big.Int", text) | ||
| } | ||
| return nil | ||
| } |
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