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GobEncode: avoid reallocating initial slice #355

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merged 2 commits into from
Apr 3, 2024
Merged

GobEncode: avoid reallocating initial slice #355

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GobEncode: avoid reallocating initial slice
serprex Mar 16, 2024
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serprex Apr 3, 2024
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19 changes: 9 additions & 10 deletions decimal.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1506,19 +1506,18 @@ func (d *Decimal) UnmarshalBinary(data []byte) error {

// MarshalBinary implements the encoding.BinaryMarshaler interface.
func (d Decimal) MarshalBinary() (data []byte, err error) {
// Write the exponent first since it's a fixed size
v1 := make([]byte, 4)
binary.BigEndian.PutUint32(v1, uint32(d.exp))

// Add the value
var v2 []byte
if v2, err = d.value.GobEncode(); err != nil {
return
// exp is written first, but encode value first to know output size
var valueData []byte
if valueData, err = d.value.GobEncode(); err != nil {
return nil, err
}

// Write the exponent in front since it's a fixed size
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expData := make([]byte, 4, len(valueData)+4)
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binary.BigEndian.PutUint32(expData, uint32(d.exp))

// Return the byte array
data = append(v1, v2...)
return
return append(expData, valueData...), nil
}

// Scan implements the sql.Scanner interface for database deserialization.
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