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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"
"strings"
"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)
}
}
}
}
}
func TestFloatGobDecodeShortBuffer(t *testing.T) {
for _, tc := range [][]byte{
[]byte{0x1, 0x0, 0x0, 0x0},
[]byte{0x1, 0xfa, 0x0, 0x0, 0x0, 0x0},
} {
err := NewFloat(0).GobDecode(tc)
if err == nil {
t.Error("expected GobDecode to return error for malformed input")
}
}
}
func TestFloatGobDecodeInvalid(t *testing.T) {
for _, tc := range []struct {
buf []byte
msg string
}{
{
[]byte{0x1, 0x2a, 0x20, 0x20, 0x20, 0x20, 0x0, 0x20, 0x20, 0x20, 0x0, 0x20, 0x20, 0x20, 0x20, 0x0, 0x0, 0x0, 0x0, 0xc},
"Float.GobDecode: msb not set in last word",
},
{
[]byte{1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0},
"Float.GobDecode: nonzero finite number with empty mantissa",
},
} {
err := NewFloat(0).GobDecode(tc.buf)
if err == nil || !strings.HasPrefix(err.Error(), tc.msg) {
t.Errorf("expected GobDecode error prefix: %s, got: %v", tc.msg, err)
}
}
}