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buffer.go
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buffer.go
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// Copyright 2013-2016 Aerospike, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package buffer
import (
"encoding/binary"
"fmt"
"math"
)
const (
SizeOfInt32 = uintptr(4)
SizeOfInt64 = uintptr(8)
uint64sz = int(8)
uint32sz = int(4)
uint16sz = int(2)
float32sz = int(4)
float64sz = int(8)
)
var SizeOfInt uintptr
var Arch64Bits bool
var Arch32Bits bool
func init() {
if 0 == ^uint(0xffffffff) {
SizeOfInt = 4
} else {
SizeOfInt = 8
}
Arch64Bits = (SizeOfInt == SizeOfInt64)
Arch32Bits = (SizeOfInt == SizeOfInt32)
}
// BytesToHexString converts a byte slice into a hex string
func BytesToHexString(buf []byte) string {
hlist := make([]byte, 3*len(buf))
for i := range buf {
hex := fmt.Sprintf("%02x ", buf[i])
idx := i * 3
copy(hlist[idx:], hex)
}
return string(hlist)
}
// LittleBytesToInt32 converts a slice into int32; only maximum of 4 bytes will be used
func LittleBytesToInt32(buf []byte, offset int) int32 {
l := len(buf[offset:])
if l > uint32sz {
l = uint32sz
}
r := int32(binary.LittleEndian.Uint32(buf[offset : offset+l]))
return r
}
// BytesToInt64 converts a slice into int64; only maximum of 8 bytes will be used
func BytesToInt64(buf []byte, offset int) int64 {
l := len(buf[offset:])
if l > uint64sz {
l = uint64sz
}
r := int64(binary.BigEndian.Uint64(buf[offset : offset+l]))
return r
}
func VarBytesToInt64(buf []byte, offset int, len int) int64 {
if len == 8 {
return BytesToInt64(buf, offset)
} else if len == 4 {
return int64(BytesToInt32(buf, offset))
} else if len == 2 {
return int64(BytesToInt16(buf, offset))
}
val := int64(0)
for i := 0; i < len; i++ {
val <<= 8
val |= int64(buf[offset+i] & 0xFF)
}
return val
}
// BytesToInt32 converts a slice into int32; only maximum of 4 bytes will be used
func BytesToInt32(buf []byte, offset int) int32 {
return int32(binary.BigEndian.Uint32(buf[offset : offset+uint32sz]))
}
// BytesToUint32 converts a slice into uint32; only maximum of 4 bytes will be used
func BytesToUint32(buf []byte, offset int) uint32 {
return binary.BigEndian.Uint32(buf[offset : offset+uint32sz])
}
// BytesToInt16 converts a slice of bytes to an int16
func BytesToInt16(buf []byte, offset int) int16 {
return int16(binary.BigEndian.Uint16(buf[offset : offset+uint16sz]))
}
func BytesToUint16(buf []byte, offset int) uint16 {
return binary.BigEndian.Uint16(buf[offset : offset+uint16sz])
}
func BytesToFloat32(buf []byte, offset int) float32 {
bits := binary.BigEndian.Uint32(buf[offset : offset+float32sz])
return math.Float32frombits(bits)
}
func BytesToFloat64(buf []byte, offset int) float64 {
bits := binary.BigEndian.Uint64(buf[offset : offset+float64sz])
return math.Float64frombits(bits)
}
func GetUnsigned(b byte) int {
r := b
if r < 0 {
r = r & 0x7f
r = r | 0x80
}
return int(r)
}