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package proto
import (
"bytes"
"encoding/binary"
"io"
"math"
)
// Buffer implements ClickHouse binary protocol encoding.
type Buffer struct {
Buf []byte
}
// Reader returns new *Reader from *Buffer.
func (b *Buffer) Reader() *Reader {
return NewReader(bytes.NewReader(b.Buf))
}
// Ensure Buf length.
func (b *Buffer) Ensure(n int) {
b.Buf = append(b.Buf[:0], make([]byte, n)...)
}
// Encoder implements encoding to Buffer.
type Encoder interface {
Encode(b *Buffer)
}
// AwareEncoder implements encoding to Buffer that depends on version.
type AwareEncoder interface {
EncodeAware(b *Buffer, version int)
}
// EncodeAware value that implements AwareEncoder.
func (b *Buffer) EncodeAware(e AwareEncoder, version int) {
e.EncodeAware(b, version)
}
// Encode value that implements Encoder.
func (b *Buffer) Encode(e Encoder) {
e.Encode(b)
}
// Reset buffer to zero length.
func (b *Buffer) Reset() {
b.Buf = b.Buf[:0]
}
// Read implements io.Reader.
func (b *Buffer) Read(p []byte) (n int, err error) {
if len(p) == 0 {
return 0, nil
}
if len(b.Buf) == 0 {
return 0, io.EOF
}
n = copy(p, b.Buf)
b.Buf = b.Buf[n:]
return n, nil
}
// PutRaw writes v as raw bytes to buffer.
func (b *Buffer) PutRaw(v []byte) {
b.Buf = append(b.Buf, v...)
}
// PutUVarInt encodes x as uvarint.
func (b *Buffer) PutUVarInt(x uint64) {
buf := make([]byte, binary.MaxVarintLen64)
n := binary.PutUvarint(buf, x)
b.Buf = append(b.Buf, buf[:n]...)
}
// PutInt encodes integer as uvarint.
func (b *Buffer) PutInt(x int) {
b.PutUVarInt(uint64(x))
}
// PutByte encodes byte as uint8.
func (b *Buffer) PutByte(x byte) {
b.PutUInt8(x)
}
// PutLen encodes length to buffer as uvarint.
func (b *Buffer) PutLen(x int) {
b.PutUVarInt(uint64(x))
}
// PutString encodes sting value to buffer.
func (b *Buffer) PutString(s string) {
b.PutLen(len(s))
b.Buf = append(b.Buf, s...)
}
func (b *Buffer) PutUInt8(x uint8) {
b.Buf = append(b.Buf, x)
}
func (b *Buffer) PutUInt16(x uint16) {
buf := make([]byte, 16/8)
binary.LittleEndian.PutUint16(buf, x)
b.Buf = append(b.Buf, buf...)
}
func (b *Buffer) PutUInt32(x uint32) {
buf := make([]byte, 32/8)
binary.LittleEndian.PutUint32(buf, x)
b.Buf = append(b.Buf, buf...)
}
func (b *Buffer) PutUInt64(x uint64) {
buf := make([]byte, 64/8)
binary.LittleEndian.PutUint64(buf, x)
b.Buf = append(b.Buf, buf...)
}
func (b *Buffer) PutUInt128(x UInt128) {
buf := make([]byte, 128/8)
binPutUInt128(buf, x)
b.Buf = append(b.Buf, buf...)
}
func (b *Buffer) PutInt8(v int8) {
b.PutUInt8(uint8(v))
}
func (b *Buffer) PutInt16(v int16) {
b.PutUInt16(uint16(v))
}
func (b *Buffer) PutInt32(x int32) {
b.PutUInt32(uint32(x))
}
func (b *Buffer) PutInt64(x int64) {
b.PutUInt64(uint64(x))
}
func (b *Buffer) PutInt128(x Int128) {
b.PutUInt128(UInt128(x))
}
func (b *Buffer) PutBool(v bool) {
if v {
b.PutUInt8(boolTrue)
} else {
b.PutUInt8(boolFalse)
}
}
func (b *Buffer) PutFloat64(v float64) {
b.PutUInt64(math.Float64bits(v))
}
func (b *Buffer) PutFloat32(v float32) {
b.PutUInt32(math.Float32bits(v))
}
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