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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.
- package big
- import (
- "bytes"
- "encoding/gob"
- "encoding/json"
- "io"
- "testing"
- )
- var floatVals = []string{
- "0",
- "1",
- "0.1",
- "2.71828",
- "1234567890",
- "3.14e1234",
- "3.14e-1234",
- "0.738957395793475734757349579759957975985497e100",
- "0.73895739579347546656564656573475734957975995797598589749859834759476745986795497e100",
- "inf",
- "Inf",
- }
- func TestFloatGobEncoding(t *testing.T) {
- var medium bytes.Buffer
- enc := gob.NewEncoder(&medium)
- dec := gob.NewDecoder(&medium)
- for _, test := range floatVals {
- for _, sign := range []string{"", "+", "-"} {
- for _, prec := range []uint{0, 1, 2, 10, 53, 64, 100, 1000} {
- for _, mode := range []RoundingMode{ToNearestEven, ToNearestAway, ToZero, AwayFromZero, ToNegativeInf, ToPositiveInf} {
- medium.Reset() // empty buffer for each test case (in case of failures)
- x := sign + test
- var tx Float
- _, _, err := tx.SetPrec(prec).SetMode(mode).Parse(x, 0)
- if err != nil {
- t.Errorf("parsing of %s (%dbits, %v) failed (invalid test case): %v", x, prec, mode, err)
- continue
- }
- // If tx was set to prec == 0, tx.Parse(x, 0) assumes precision 64. Correct it.
- if prec == 0 {
- tx.SetPrec(0)
- }
- if err := enc.Encode(&tx); err != nil {
- t.Errorf("encoding of %v (%dbits, %v) failed: %v", &tx, prec, mode, err)
- continue
- }
- var rx Float
- if err := dec.Decode(&rx); err != nil {
- t.Errorf("decoding of %v (%dbits, %v) failed: %v", &tx, prec, mode, err)
- continue
- }
- if rx.Cmp(&tx) != 0 {
- t.Errorf("transmission of %s failed: got %s want %s", x, rx.String(), tx.String())
- continue
- }
- if rx.Prec() != prec {
- t.Errorf("transmission of %s's prec failed: got %d want %d", x, rx.Prec(), prec)
- }
- if rx.Mode() != mode {
- t.Errorf("transmission of %s's mode failed: got %s want %s", x, rx.Mode(), mode)
- }
- if rx.Acc() != tx.Acc() {
- t.Errorf("transmission of %s's accuracy failed: got %s want %s", x, rx.Acc(), tx.Acc())
- }
- }
- }
- }
- }
- }
- func TestFloatCorruptGob(t *testing.T) {
- var buf bytes.Buffer
- tx := NewFloat(4 / 3).SetPrec(1000).SetMode(ToPositiveInf)
- if err := gob.NewEncoder(&buf).Encode(tx); err != nil {
- t.Fatal(err)
- }
- b := buf.Bytes()
- var rx Float
- if err := gob.NewDecoder(bytes.NewReader(b)).Decode(&rx); err != nil {
- t.Fatal(err)
- }
- if err := gob.NewDecoder(bytes.NewReader(b[:10])).Decode(&rx); err != io.ErrUnexpectedEOF {
- t.Errorf("got %v want EOF", err)
- }
- b[1] = 0
- if err := gob.NewDecoder(bytes.NewReader(b)).Decode(&rx); err == nil {
- t.Fatal("got nil want version error")
- }
- }
- func TestFloatJSONEncoding(t *testing.T) {
- for _, test := range floatVals {
- for _, sign := range []string{"", "+", "-"} {
- for _, prec := range []uint{0, 1, 2, 10, 53, 64, 100, 1000} {
- if prec > 53 && testing.Short() {
- continue
- }
- x := sign + test
- var tx Float
- _, _, err := tx.SetPrec(prec).Parse(x, 0)
- if err != nil {
- t.Errorf("parsing of %s (prec = %d) failed (invalid test case): %v", x, prec, err)
- continue
- }
- b, err := json.Marshal(&tx)
- if err != nil {
- t.Errorf("marshaling of %v (prec = %d) failed: %v", &tx, prec, err)
- continue
- }
- var rx Float
- rx.SetPrec(prec)
- if err := json.Unmarshal(b, &rx); err != nil {
- t.Errorf("unmarshaling of %v (prec = %d) failed: %v", &tx, prec, err)
- continue
- }
- if rx.Cmp(&tx) != 0 {
- t.Errorf("JSON encoding of %v (prec = %d) failed: got %v want %v", &tx, prec, &rx, &tx)
- }
- }
- }
- }
- }
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