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slightly improve utils.Write* performance by using slices

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This commit is contained in:
Lucas Clemente
2016-09-05 23:38:40 +02:00
parent 53ae201fd2
commit 0911f0aae4
1 changed files with 19 additions and 35 deletions
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54
utils/utils.go
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@@ -94,65 +94,49 @@ func ReadUint16(b io.ByteReader) (uint16, error) {
// WriteUint64 writes a uint64 // WriteUint64 writes a uint64
func WriteUint64(b *bytes.Buffer, i uint64) { func WriteUint64(b *bytes.Buffer, i uint64) {
b.WriteByte(uint8(i)) b.Write([]byte{
b.WriteByte(uint8(i >> 8)) uint8(i), uint8(i >> 8), uint8(i >> 16), uint8(i >> 24),
b.WriteByte(uint8(i >> 16)) uint8(i >> 32), uint8(i >> 40), uint8(i >> 48), uint8(i >> 56),
b.WriteByte(uint8(i >> 24)) })
b.WriteByte(uint8(i >> 32))
b.WriteByte(uint8(i >> 40))
b.WriteByte(uint8(i >> 48))
b.WriteByte(uint8(i >> 56))
} }
// WriteUint56 writes 56 bit of a uint64 // WriteUint56 writes 56 bit of a uint64
func WriteUint56(b *bytes.Buffer, i uint64) { func WriteUint56(b *bytes.Buffer, i uint64) {
b.WriteByte(uint8(i)) b.Write([]byte{
b.WriteByte(uint8(i >> 8)) uint8(i), uint8(i >> 8), uint8(i >> 16), uint8(i >> 24),
b.WriteByte(uint8(i >> 16)) uint8(i >> 32), uint8(i >> 40), uint8(i >> 48),
b.WriteByte(uint8(i >> 24)) })
b.WriteByte(uint8(i >> 32))
b.WriteByte(uint8(i >> 40))
b.WriteByte(uint8(i >> 48))
} }
// WriteUint48 writes 48 bit of a uint64 // WriteUint48 writes 48 bit of a uint64
func WriteUint48(b *bytes.Buffer, i uint64) { func WriteUint48(b *bytes.Buffer, i uint64) {
b.WriteByte(uint8(i)) b.Write([]byte{
b.WriteByte(uint8(i >> 8)) uint8(i), uint8(i >> 8), uint8(i >> 16), uint8(i >> 24),
b.WriteByte(uint8(i >> 16)) uint8(i >> 32), uint8(i >> 40),
b.WriteByte(uint8(i >> 24)) })
b.WriteByte(uint8(i >> 32))
b.WriteByte(uint8(i >> 40))
} }
// WriteUint40 writes 40 bit of a uint64 // WriteUint40 writes 40 bit of a uint64
func WriteUint40(b *bytes.Buffer, i uint64) { func WriteUint40(b *bytes.Buffer, i uint64) {
b.WriteByte(uint8(i)) b.Write([]byte{
b.WriteByte(uint8(i >> 8)) uint8(i), uint8(i >> 8), uint8(i >> 16),
b.WriteByte(uint8(i >> 16)) uint8(i >> 24), uint8(i >> 32),
b.WriteByte(uint8(i >> 24)) })
b.WriteByte(uint8(i >> 32))
} }
// WriteUint32 writes a uint32 // WriteUint32 writes a uint32
func WriteUint32(b *bytes.Buffer, i uint32) { func WriteUint32(b *bytes.Buffer, i uint32) {
b.WriteByte(uint8(i)) b.Write([]byte{uint8(i), uint8(i >> 8), uint8(i >> 16), uint8(i >> 24)})
b.WriteByte(uint8(i >> 8))
b.WriteByte(uint8(i >> 16))
b.WriteByte(uint8(i >> 24))
} }
// WriteUint24 writes 24 bit of a uint32 // WriteUint24 writes 24 bit of a uint32
func WriteUint24(b *bytes.Buffer, i uint32) { func WriteUint24(b *bytes.Buffer, i uint32) {
b.WriteByte(uint8(i)) b.Write([]byte{uint8(i), uint8(i >> 8), uint8(i >> 16)})
b.WriteByte(uint8(i >> 8))
b.WriteByte(uint8(i >> 16))
} }
// WriteUint16 writes a uint16 // WriteUint16 writes a uint16
func WriteUint16(b *bytes.Buffer, i uint16) { func WriteUint16(b *bytes.Buffer, i uint16) {
b.WriteByte(uint8(i)) b.Write([]byte{uint8(i), uint8(i >> 8)})
b.WriteByte(uint8(i >> 8))
} }
// Uint32Slice attaches the methods of sort.Interface to []uint32, sorting in increasing order. // Uint32Slice attaches the methods of sort.Interface to []uint32, sorting in increasing order.