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dataoutputx.go
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dataoutputx.go
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package netdata
import (
"bytes"
"encoding/binary"
"io"
"math"
)
// A DataOutputX is a output stream which used write various kinds of data.
type DataOutputX struct {
written int32 // the wrtten bytes.
//buffer *bytes.Buffer
writer io.Writer
}
// NewDataOutputX returns DataOutputX object
func NewDataOutputX(any interface{}) *DataOutputX {
out := new(DataOutputX)
out.written = 0
switch v := any.(type) {
case nil:
out.writer = new(bytes.Buffer)
case io.Writer:
out.writer = v
default:
out.writer = new(bytes.Buffer)
}
return out
}
func (out *DataOutputX) WriteInt32Array(values []int32) (*DataOutputX, error) {
var err error
if values == nil {
_, err = out.WriteInt16(0)
} else {
_, err = out.WriteInt16(int16(len(values)))
for _, v := range values {
_, err = out.WriteInt32(v)
}
}
return out, err
}
// WriteInt32 write int32 number to buffer.
func (out *DataOutputX) WriteInt32(value int32) (*DataOutputX, error){
out.written += 4
err := binary.Write(out.writer, binary.BigEndian, value)
if err != nil {
return out, err
}
return out, err
}
// WriteInt16 write int16 number to buffer.
func (out *DataOutputX) WriteInt16(value int16) (*DataOutputX, error) {
out.written += 2
err := binary.Write(out.writer, binary.BigEndian, value)
if err != nil {
return out, err
}
return out, err
}
// WriteInt64 write int64 number to buffer.
func (out *DataOutputX) WriteInt64(value int64) (*DataOutputX, error) {
out.written += 8
err := binary.Write(out.writer, binary.BigEndian, value)
if err != nil {
return out, err
}
return out, err
}
// WriteUInt64 write uint64 number to buffer.
func (out *DataOutputX) WriteUInt64(value uint64) (*DataOutputX, error) {
out.written += 8
err := binary.Write(out.writer, binary.BigEndian, value)
return out, err
}
//WriteInt8 write int8 number to buffer
func (out *DataOutputX) WriteInt8(value int8) (*DataOutputX, error) {
out.written++
err := binary.Write(out.writer, binary.BigEndian, value)
return out, err
}
//WriteUInt8 write int8 number to buffer
func (out *DataOutputX) WriteUInt8(value uint8) (*DataOutputX, error) {
out.written++
err := binary.Write(out.writer, binary.BigEndian, value)
return out, err
}
// WriteFloat32 writes float32 value to buffer
func (out *DataOutputX) WriteFloat32(value float32) (*DataOutputX, error) {
out.written += 4
err := binary.Write(out.writer, binary.BigEndian, value)
return out, err
}
// WriteFloat64 writes float64 value to buffer
func (out *DataOutputX) WriteFloat64(value float64) (*DataOutputX, error) {
out.written += 8
err := binary.Write(out.writer, binary.BigEndian, value)
return out, err
}
// WriteDecimal writes number type value to buffer
func (out *DataOutputX) WriteDecimal(value int64) (*DataOutputX, error) {
var err error
if value == 0 {
_, err = out.WriteInt8(0)
} else if value >= math.MinInt8 && value <= math.MaxInt8 {
_, err = out.WriteInt8(1)
_, err = out.WriteInt8(int8(value))
} else if value >= math.MinInt16 && value <= math.MaxInt16 {
_, err = out.WriteInt8(2)
_, err = out.WriteInt16(int16(value))
} else if value >= math.MinInt32 && value <= math.MaxInt32 {
_, err = out.WriteInt8(4)
_, err = out.WriteInt32(int32(value))
} else if value >= math.MinInt64 && value <= math.MaxInt64 {
_, err = out.WriteInt8(8)
_, err = out.WriteInt64(value)
}
return out, err
}
func (out *DataOutputX) WriteDecimal32(value int32) (*DataOutputX, error) {
var err error
if value == 0 {
_, err = out.WriteInt8(0)
} else if value >= math.MinInt8 && value <= math.MaxInt8 {
_, err = out.WriteInt8(1)
_, err = out.WriteInt8(int8(value))
} else if value >= math.MinInt16 && value <= math.MaxInt16 {
_, err = out.WriteInt8(2)
_, err = out.WriteInt16(int16(value))
} else if value >= math.MinInt32 && value <= math.MaxInt32 {
_, err = out.WriteInt8(4)
_, err = out.WriteInt32(int32(value))
}
return out, err
}
// WriteValue wtires value type to buffer
func (out *DataOutputX) WriteValue(value Value) (*DataOutputX, error) {
if value == nil {
value = NewNilValue()
}
_, err := out.WriteUInt8(uint8(value.GetValueType()))
value.Write(out)
return out, err
}
func (out *DataOutputX) WritePack(pack Pack) (*DataOutputX, error) {
_, err := out.WriteUInt8(uint8(pack.GetPackType()))
pack.Write(out)
return out, err
}
func (out *DataOutputX) WriteStep(step Step) (*DataOutputX, error) {
_, err := out.WriteUInt8(uint8(step.GetStepType()))
err = step.Write(out)
return out, err
}
// WriteString writes string value to buffer
func (out *DataOutputX) WriteString(value string) (*DataOutputX, error) {
length := len(value)
var err error
if length == 0 {
_, err = out.WriteInt8(0)
} else if length > 100000 {
err = out.WriteBlob([]byte("huge string omitted..."))
} else {
err = out.WriteBlob([]byte(value))
}
return out, err
}
func (out *DataOutputX) WriteIntBytes(value []byte) error {
var err error
_, err = out.WriteInt32(int32(len(value)))
err = out.Write(value)
return err
}
// WriteBlob writes byte array to buffer
func (out *DataOutputX) WriteBlob(value []byte) error {
valueLen := len(value)
var err error
if valueLen == 0 {
_, err = out.WriteUInt8(0)
} else {
if valueLen <= 253 {
_, err = out.WriteUInt8(byte(valueLen))
err = out.Write(value)
} else if valueLen <= 65535 {
_, err = out.WriteUInt8(255)
_, err = out.WriteInt16(int16(valueLen))
err = out.Write(value)
} else {
_, err = out.WriteUInt8(254)
_, err = out.WriteInt32(int32(valueLen))
err = out.Write(value)
}
}
return err
}
func (out *DataOutputX) Write(value []byte) error {
out.written += int32(len(value))
_, err := out.writer.Write(value)
return err
}
// Bytes returns buffer's bytes
func (out *DataOutputX) Bytes() []byte{
if out == nil {
return nil
}
switch v := out.writer.(type) {
case *bytes.Buffer:
return v.Bytes()
default:
return nil
}
}
// WriteBoolean write bool valvue to buffer
func (out *DataOutputX) WriteBoolean(value bool) (*DataOutputX, error) {
var err error
if value == true {
_, err = out.WriteInt8(1)
} else {
_, err = out.WriteInt8(0)
}
return out, err
}
// Size returns written size
func (out *DataOutputX) Size() int32 {
return out.written
}
// GetWriteSize returns written size
func (out *DataOutputX) GetWriteSize() int32 {
return out.written
}