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write float64

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This commit is contained in:
Tao Wen
2017-01-07 23:32:54 +08:00
parent ba3c30799b
commit bdbf8dcd42
2 changed files with 54 additions and 0 deletions
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30
feature_stream_float.go
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@ -36,4 +36,34 @@ func (stream *Stream) WriteFloat32(val float32) {
for stream.buf[stream.n - 1] == '0' {
stream.n--;
}
}
func (stream *Stream) WriteFloat64(val float64) {
if val < 0 {
stream.writeByte('-')
val = -val
}
if val > 0x4ffffff {
stream.WriteRaw(strconv.FormatFloat(val, 'f', -1, 64));
return
}
precision := 6
exp := uint64(1000000) // 6
lval := uint64(val * float64(exp) + 0.5)
stream.WriteUint64(lval / exp)
fval := lval % exp
if fval == 0 {
return
}
stream.writeByte('.')
if stream.Available() < 10 {
stream.Flush()
}
for p := precision - 1; p > 0 && fval < POW10[p]; p-- {
stream.writeByte('0')
}
stream.WriteUint64(fval);
for stream.buf[stream.n - 1] == '0' {
stream.n--;
}
}