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read_writer.go
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/
read_writer.go
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package cser
import (
"errors"
"math/big"
"github.com/corex-mn/go-corex/utils/bits"
"github.com/corex-mn/go-corex/utils/fast"
)
var (
ErrNonCanonicalEncoding = errors.New("non canonical encoding")
ErrMalformedEncoding = errors.New("malformed encoding")
)
type Writer struct {
BitsW *bits.Writer
BytesW *fast.Writer
}
type Reader struct {
BitsR *bits.Reader
BytesR *fast.Reader
}
func NewWriter() *Writer {
bbits := &bits.Array{Bytes: make([]byte, 0, 32)}
bbytes := make([]byte, 0, 200)
return &Writer{
BitsW: bits.NewWriter(bbits),
BytesW: fast.NewWriter(bbytes),
}
}
func writeUint64Compact(bytesW *fast.Writer, v uint64) {
for i := 0; ; i++ {
chunk := v & 0b01111111
v = v >> 7
if v == 0 {
// stop flag
chunk |= 0b10000000
}
bytesW.WriteByte(byte(chunk))
if v == 0 {
break
}
}
return
}
func readUint64Compact(bytesR *fast.Reader) uint64 {
v := uint64(0)
stop := false
for i := 0; !stop; i++ {
chunk := uint64(bytesR.ReadByte())
stop = (chunk & 0b10000000) != 0
word := chunk & 0b01111111
v |= word << (i * 7)
// last byte cannot be zero
if i > 0 && stop && word == 0 {
panic(ErrNonCanonicalEncoding)
}
}
return v
}
func writeUint64BitCompact(bytesW *fast.Writer, v uint64, minSize int) (size int) {
for size < minSize || v != 0 {
bytesW.WriteByte(byte(v))
size++
v = v >> 8
}
return
}
func readUint64BitCompact(bytesR *fast.Reader, size int) uint64 {
var (
v uint64
last byte
)
buf := bytesR.Read(size)
for i, b := range buf {
v |= uint64(b) << uint(8*i)
last = b
}
if size > 1 && last == 0 {
panic(ErrNonCanonicalEncoding)
}
return v
}
func (r *Reader) U8() uint8 {
return r.BytesR.ReadByte()
}
func (w *Writer) U8(v uint8) {
w.BytesW.WriteByte(v)
}
func (r *Reader) readU64_bits(minSize int, bitsForSize int) uint64 {
size := r.BitsR.Read(bitsForSize)
size += uint(minSize)
return readUint64BitCompact(r.BytesR, int(size))
}
func (w *Writer) writeU64_bits(minSize int, bitsForSize int, v uint64) {
size := writeUint64BitCompact(w.BytesW, v, minSize)
w.BitsW.Write(bitsForSize, uint(size-minSize))
}
func (r *Reader) U16() uint16 {
v64 := r.readU64_bits(1, 1)
return uint16(v64)
}
func (w *Writer) U16(v uint16) {
w.writeU64_bits(1, 1, uint64(v))
}
func (r *Reader) U32() uint32 {
v64 := r.readU64_bits(1, 2)
return uint32(v64)
}
func (w *Writer) U32(v uint32) {
w.writeU64_bits(1, 2, uint64(v))
}
func (r *Reader) U64() uint64 {
return r.readU64_bits(1, 3)
}
func (w *Writer) U64(v uint64) {
w.writeU64_bits(1, 3, v)
}
func (r *Reader) VarUint() uint64 {
return r.readU64_bits(1, 3)
}
func (w *Writer) VarUint(v uint64) {
w.writeU64_bits(1, 3, v)
}
func (r *Reader) I64() int64 {
neg := r.Bool()
abs := r.U64()
if neg && abs == 0 {
panic(ErrNonCanonicalEncoding)
}
if neg {
return -int64(abs)
}
return int64(abs)
}
func (w *Writer) I64(v int64) {
w.Bool(v < 0)
if v < 0 {
w.U64(uint64(-v))
} else {
w.U64(uint64(v))
}
}
func (r *Reader) U56() uint64 {
return r.readU64_bits(0, 3)
}
func (w *Writer) U56(v uint64) {
const max = 1<<(8*7) - 1
if v > max {
panic("Value too big")
}
w.writeU64_bits(0, 3, v)
}
func (r *Reader) Bool() bool {
u8 := r.BitsR.Read(1)
return u8 != 0
}
func (w *Writer) Bool(v bool) {
u8 := uint(0)
if v {
u8 = 1
}
w.BitsW.Write(1, u8)
}
func (r *Reader) FixedBytes(v []byte) {
buf := r.BytesR.Read(len(v))
copy(v, buf)
}
func (w *Writer) FixedBytes(v []byte) {
w.BytesW.Write(v)
}
func (r *Reader) SliceBytes() []byte {
// read slice size
size := r.U56()
buf := make([]byte, size)
// read slice content
r.FixedBytes(buf)
return buf
}
func (w *Writer) SliceBytes(v []byte) {
// write slice size
w.U56(uint64(len(v)))
// write slice content
w.FixedBytes(v)
}
// PaddedBytes returns a slice with length of the slice is at least n bytes.
func PaddedBytes(b []byte, n int) []byte {
if len(b) >= n {
return b
}
padding := make([]byte, n-len(b))
return append(padding, b...)
}
func (w *Writer) BigInt(v *big.Int) {
// serialize as an ordinary slice
bigBytes := []byte{}
if v.Sign() != 0 {
bigBytes = v.Bytes()
}
w.SliceBytes(bigBytes)
}
func (r *Reader) BigInt() *big.Int {
// deserialize as an ordinary slice
buf := r.SliceBytes()
if len(buf) == 0 {
return new(big.Int)
}
return new(big.Int).SetBytes(buf)
}