mirror of
https://codeberg.org/superseriousbusiness/gotosocial.git
synced 2024-12-30 12:58:16 +03:00
663 lines
14 KiB
Go
663 lines
14 KiB
Go
package msgpack
|
|
|
|
import (
|
|
"bufio"
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"reflect"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/vmihailenco/msgpack/v5/msgpcode"
|
|
)
|
|
|
|
const (
|
|
looseInterfaceDecodingFlag uint32 = 1 << iota
|
|
disallowUnknownFieldsFlag
|
|
)
|
|
|
|
const (
|
|
bytesAllocLimit = 1e6 // 1mb
|
|
sliceAllocLimit = 1e4
|
|
maxMapSize = 1e6
|
|
)
|
|
|
|
type bufReader interface {
|
|
io.Reader
|
|
io.ByteScanner
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
var decPool = sync.Pool{
|
|
New: func() interface{} {
|
|
return NewDecoder(nil)
|
|
},
|
|
}
|
|
|
|
func GetDecoder() *Decoder {
|
|
return decPool.Get().(*Decoder)
|
|
}
|
|
|
|
func PutDecoder(dec *Decoder) {
|
|
dec.r = nil
|
|
dec.s = nil
|
|
decPool.Put(dec)
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
// Unmarshal decodes the MessagePack-encoded data and stores the result
|
|
// in the value pointed to by v.
|
|
func Unmarshal(data []byte, v interface{}) error {
|
|
dec := GetDecoder()
|
|
|
|
dec.Reset(bytes.NewReader(data))
|
|
err := dec.Decode(v)
|
|
|
|
PutDecoder(dec)
|
|
|
|
return err
|
|
}
|
|
|
|
// A Decoder reads and decodes MessagePack values from an input stream.
|
|
type Decoder struct {
|
|
r io.Reader
|
|
s io.ByteScanner
|
|
buf []byte
|
|
|
|
rec []byte // accumulates read data if not nil
|
|
|
|
dict []string
|
|
flags uint32
|
|
structTag string
|
|
mapDecoder func(*Decoder) (interface{}, error)
|
|
}
|
|
|
|
// NewDecoder returns a new decoder that reads from r.
|
|
//
|
|
// The decoder introduces its own buffering and may read data from r
|
|
// beyond the requested msgpack values. Buffering can be disabled
|
|
// by passing a reader that implements io.ByteScanner interface.
|
|
func NewDecoder(r io.Reader) *Decoder {
|
|
d := new(Decoder)
|
|
d.Reset(r)
|
|
return d
|
|
}
|
|
|
|
// Reset discards any buffered data, resets all state, and switches the buffered
|
|
// reader to read from r.
|
|
func (d *Decoder) Reset(r io.Reader) {
|
|
d.ResetDict(r, nil)
|
|
}
|
|
|
|
// ResetDict is like Reset, but also resets the dict.
|
|
func (d *Decoder) ResetDict(r io.Reader, dict []string) {
|
|
d.resetReader(r)
|
|
d.flags = 0
|
|
d.structTag = ""
|
|
d.mapDecoder = nil
|
|
d.dict = dict
|
|
}
|
|
|
|
func (d *Decoder) WithDict(dict []string, fn func(*Decoder) error) error {
|
|
oldDict := d.dict
|
|
d.dict = dict
|
|
err := fn(d)
|
|
d.dict = oldDict
|
|
return err
|
|
}
|
|
|
|
func (d *Decoder) resetReader(r io.Reader) {
|
|
if br, ok := r.(bufReader); ok {
|
|
d.r = br
|
|
d.s = br
|
|
} else {
|
|
br := bufio.NewReader(r)
|
|
d.r = br
|
|
d.s = br
|
|
}
|
|
}
|
|
|
|
func (d *Decoder) SetMapDecoder(fn func(*Decoder) (interface{}, error)) {
|
|
d.mapDecoder = fn
|
|
}
|
|
|
|
// UseLooseInterfaceDecoding causes decoder to use DecodeInterfaceLoose
|
|
// to decode msgpack value into Go interface{}.
|
|
func (d *Decoder) UseLooseInterfaceDecoding(on bool) {
|
|
if on {
|
|
d.flags |= looseInterfaceDecodingFlag
|
|
} else {
|
|
d.flags &= ^looseInterfaceDecodingFlag
|
|
}
|
|
}
|
|
|
|
// SetCustomStructTag causes the decoder to use the supplied tag as a fallback option
|
|
// if there is no msgpack tag.
|
|
func (d *Decoder) SetCustomStructTag(tag string) {
|
|
d.structTag = tag
|
|
}
|
|
|
|
// DisallowUnknownFields causes the Decoder to return an error when the destination
|
|
// is a struct and the input contains object keys which do not match any
|
|
// non-ignored, exported fields in the destination.
|
|
func (d *Decoder) DisallowUnknownFields(on bool) {
|
|
if on {
|
|
d.flags |= disallowUnknownFieldsFlag
|
|
} else {
|
|
d.flags &= ^disallowUnknownFieldsFlag
|
|
}
|
|
}
|
|
|
|
// UseInternedStrings enables support for decoding interned strings.
|
|
func (d *Decoder) UseInternedStrings(on bool) {
|
|
if on {
|
|
d.flags |= useInternedStringsFlag
|
|
} else {
|
|
d.flags &= ^useInternedStringsFlag
|
|
}
|
|
}
|
|
|
|
// Buffered returns a reader of the data remaining in the Decoder's buffer.
|
|
// The reader is valid until the next call to Decode.
|
|
func (d *Decoder) Buffered() io.Reader {
|
|
return d.r
|
|
}
|
|
|
|
//nolint:gocyclo
|
|
func (d *Decoder) Decode(v interface{}) error {
|
|
var err error
|
|
switch v := v.(type) {
|
|
case *string:
|
|
if v != nil {
|
|
*v, err = d.DecodeString()
|
|
return err
|
|
}
|
|
case *[]byte:
|
|
if v != nil {
|
|
return d.decodeBytesPtr(v)
|
|
}
|
|
case *int:
|
|
if v != nil {
|
|
*v, err = d.DecodeInt()
|
|
return err
|
|
}
|
|
case *int8:
|
|
if v != nil {
|
|
*v, err = d.DecodeInt8()
|
|
return err
|
|
}
|
|
case *int16:
|
|
if v != nil {
|
|
*v, err = d.DecodeInt16()
|
|
return err
|
|
}
|
|
case *int32:
|
|
if v != nil {
|
|
*v, err = d.DecodeInt32()
|
|
return err
|
|
}
|
|
case *int64:
|
|
if v != nil {
|
|
*v, err = d.DecodeInt64()
|
|
return err
|
|
}
|
|
case *uint:
|
|
if v != nil {
|
|
*v, err = d.DecodeUint()
|
|
return err
|
|
}
|
|
case *uint8:
|
|
if v != nil {
|
|
*v, err = d.DecodeUint8()
|
|
return err
|
|
}
|
|
case *uint16:
|
|
if v != nil {
|
|
*v, err = d.DecodeUint16()
|
|
return err
|
|
}
|
|
case *uint32:
|
|
if v != nil {
|
|
*v, err = d.DecodeUint32()
|
|
return err
|
|
}
|
|
case *uint64:
|
|
if v != nil {
|
|
*v, err = d.DecodeUint64()
|
|
return err
|
|
}
|
|
case *bool:
|
|
if v != nil {
|
|
*v, err = d.DecodeBool()
|
|
return err
|
|
}
|
|
case *float32:
|
|
if v != nil {
|
|
*v, err = d.DecodeFloat32()
|
|
return err
|
|
}
|
|
case *float64:
|
|
if v != nil {
|
|
*v, err = d.DecodeFloat64()
|
|
return err
|
|
}
|
|
case *[]string:
|
|
return d.decodeStringSlicePtr(v)
|
|
case *map[string]string:
|
|
return d.decodeMapStringStringPtr(v)
|
|
case *map[string]interface{}:
|
|
return d.decodeMapStringInterfacePtr(v)
|
|
case *time.Duration:
|
|
if v != nil {
|
|
vv, err := d.DecodeInt64()
|
|
*v = time.Duration(vv)
|
|
return err
|
|
}
|
|
case *time.Time:
|
|
if v != nil {
|
|
*v, err = d.DecodeTime()
|
|
return err
|
|
}
|
|
}
|
|
|
|
vv := reflect.ValueOf(v)
|
|
if !vv.IsValid() {
|
|
return errors.New("msgpack: Decode(nil)")
|
|
}
|
|
if vv.Kind() != reflect.Ptr {
|
|
return fmt.Errorf("msgpack: Decode(non-pointer %T)", v)
|
|
}
|
|
if vv.IsNil() {
|
|
return fmt.Errorf("msgpack: Decode(non-settable %T)", v)
|
|
}
|
|
|
|
vv = vv.Elem()
|
|
if vv.Kind() == reflect.Interface {
|
|
if !vv.IsNil() {
|
|
vv = vv.Elem()
|
|
if vv.Kind() != reflect.Ptr {
|
|
return fmt.Errorf("msgpack: Decode(non-pointer %s)", vv.Type().String())
|
|
}
|
|
}
|
|
}
|
|
|
|
return d.DecodeValue(vv)
|
|
}
|
|
|
|
func (d *Decoder) DecodeMulti(v ...interface{}) error {
|
|
for _, vv := range v {
|
|
if err := d.Decode(vv); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (d *Decoder) decodeInterfaceCond() (interface{}, error) {
|
|
if d.flags&looseInterfaceDecodingFlag != 0 {
|
|
return d.DecodeInterfaceLoose()
|
|
}
|
|
return d.DecodeInterface()
|
|
}
|
|
|
|
func (d *Decoder) DecodeValue(v reflect.Value) error {
|
|
decode := getDecoder(v.Type())
|
|
return decode(d, v)
|
|
}
|
|
|
|
func (d *Decoder) DecodeNil() error {
|
|
c, err := d.readCode()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if c != msgpcode.Nil {
|
|
return fmt.Errorf("msgpack: invalid code=%x decoding nil", c)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (d *Decoder) decodeNilValue(v reflect.Value) error {
|
|
err := d.DecodeNil()
|
|
if v.IsNil() {
|
|
return err
|
|
}
|
|
if v.Kind() == reflect.Ptr {
|
|
v = v.Elem()
|
|
}
|
|
v.Set(reflect.Zero(v.Type()))
|
|
return err
|
|
}
|
|
|
|
func (d *Decoder) DecodeBool() (bool, error) {
|
|
c, err := d.readCode()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return d.bool(c)
|
|
}
|
|
|
|
func (d *Decoder) bool(c byte) (bool, error) {
|
|
if c == msgpcode.Nil {
|
|
return false, nil
|
|
}
|
|
if c == msgpcode.False {
|
|
return false, nil
|
|
}
|
|
if c == msgpcode.True {
|
|
return true, nil
|
|
}
|
|
return false, fmt.Errorf("msgpack: invalid code=%x decoding bool", c)
|
|
}
|
|
|
|
func (d *Decoder) DecodeDuration() (time.Duration, error) {
|
|
n, err := d.DecodeInt64()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return time.Duration(n), nil
|
|
}
|
|
|
|
// DecodeInterface decodes value into interface. It returns following types:
|
|
// - nil,
|
|
// - bool,
|
|
// - int8, int16, int32, int64,
|
|
// - uint8, uint16, uint32, uint64,
|
|
// - float32 and float64,
|
|
// - string,
|
|
// - []byte,
|
|
// - slices of any of the above,
|
|
// - maps of any of the above.
|
|
//
|
|
// DecodeInterface should be used only when you don't know the type of value
|
|
// you are decoding. For example, if you are decoding number it is better to use
|
|
// DecodeInt64 for negative numbers and DecodeUint64 for positive numbers.
|
|
func (d *Decoder) DecodeInterface() (interface{}, error) {
|
|
c, err := d.readCode()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if msgpcode.IsFixedNum(c) {
|
|
return int8(c), nil
|
|
}
|
|
if msgpcode.IsFixedMap(c) {
|
|
err = d.s.UnreadByte()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return d.decodeMapDefault()
|
|
}
|
|
if msgpcode.IsFixedArray(c) {
|
|
return d.decodeSlice(c)
|
|
}
|
|
if msgpcode.IsFixedString(c) {
|
|
return d.string(c)
|
|
}
|
|
|
|
switch c {
|
|
case msgpcode.Nil:
|
|
return nil, nil
|
|
case msgpcode.False, msgpcode.True:
|
|
return d.bool(c)
|
|
case msgpcode.Float:
|
|
return d.float32(c)
|
|
case msgpcode.Double:
|
|
return d.float64(c)
|
|
case msgpcode.Uint8:
|
|
return d.uint8()
|
|
case msgpcode.Uint16:
|
|
return d.uint16()
|
|
case msgpcode.Uint32:
|
|
return d.uint32()
|
|
case msgpcode.Uint64:
|
|
return d.uint64()
|
|
case msgpcode.Int8:
|
|
return d.int8()
|
|
case msgpcode.Int16:
|
|
return d.int16()
|
|
case msgpcode.Int32:
|
|
return d.int32()
|
|
case msgpcode.Int64:
|
|
return d.int64()
|
|
case msgpcode.Bin8, msgpcode.Bin16, msgpcode.Bin32:
|
|
return d.bytes(c, nil)
|
|
case msgpcode.Str8, msgpcode.Str16, msgpcode.Str32:
|
|
return d.string(c)
|
|
case msgpcode.Array16, msgpcode.Array32:
|
|
return d.decodeSlice(c)
|
|
case msgpcode.Map16, msgpcode.Map32:
|
|
err = d.s.UnreadByte()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return d.decodeMapDefault()
|
|
case msgpcode.FixExt1, msgpcode.FixExt2, msgpcode.FixExt4, msgpcode.FixExt8, msgpcode.FixExt16,
|
|
msgpcode.Ext8, msgpcode.Ext16, msgpcode.Ext32:
|
|
return d.decodeInterfaceExt(c)
|
|
}
|
|
|
|
return 0, fmt.Errorf("msgpack: unknown code %x decoding interface{}", c)
|
|
}
|
|
|
|
// DecodeInterfaceLoose is like DecodeInterface except that:
|
|
// - int8, int16, and int32 are converted to int64,
|
|
// - uint8, uint16, and uint32 are converted to uint64,
|
|
// - float32 is converted to float64.
|
|
// - []byte is converted to string.
|
|
func (d *Decoder) DecodeInterfaceLoose() (interface{}, error) {
|
|
c, err := d.readCode()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if msgpcode.IsFixedNum(c) {
|
|
return int64(int8(c)), nil
|
|
}
|
|
if msgpcode.IsFixedMap(c) {
|
|
err = d.s.UnreadByte()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return d.decodeMapDefault()
|
|
}
|
|
if msgpcode.IsFixedArray(c) {
|
|
return d.decodeSlice(c)
|
|
}
|
|
if msgpcode.IsFixedString(c) {
|
|
return d.string(c)
|
|
}
|
|
|
|
switch c {
|
|
case msgpcode.Nil:
|
|
return nil, nil
|
|
case msgpcode.False, msgpcode.True:
|
|
return d.bool(c)
|
|
case msgpcode.Float, msgpcode.Double:
|
|
return d.float64(c)
|
|
case msgpcode.Uint8, msgpcode.Uint16, msgpcode.Uint32, msgpcode.Uint64:
|
|
return d.uint(c)
|
|
case msgpcode.Int8, msgpcode.Int16, msgpcode.Int32, msgpcode.Int64:
|
|
return d.int(c)
|
|
case msgpcode.Str8, msgpcode.Str16, msgpcode.Str32,
|
|
msgpcode.Bin8, msgpcode.Bin16, msgpcode.Bin32:
|
|
return d.string(c)
|
|
case msgpcode.Array16, msgpcode.Array32:
|
|
return d.decodeSlice(c)
|
|
case msgpcode.Map16, msgpcode.Map32:
|
|
err = d.s.UnreadByte()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return d.decodeMapDefault()
|
|
case msgpcode.FixExt1, msgpcode.FixExt2, msgpcode.FixExt4, msgpcode.FixExt8, msgpcode.FixExt16,
|
|
msgpcode.Ext8, msgpcode.Ext16, msgpcode.Ext32:
|
|
return d.decodeInterfaceExt(c)
|
|
}
|
|
|
|
return 0, fmt.Errorf("msgpack: unknown code %x decoding interface{}", c)
|
|
}
|
|
|
|
// Skip skips next value.
|
|
func (d *Decoder) Skip() error {
|
|
c, err := d.readCode()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if msgpcode.IsFixedNum(c) {
|
|
return nil
|
|
}
|
|
if msgpcode.IsFixedMap(c) {
|
|
return d.skipMap(c)
|
|
}
|
|
if msgpcode.IsFixedArray(c) {
|
|
return d.skipSlice(c)
|
|
}
|
|
if msgpcode.IsFixedString(c) {
|
|
return d.skipBytes(c)
|
|
}
|
|
|
|
switch c {
|
|
case msgpcode.Nil, msgpcode.False, msgpcode.True:
|
|
return nil
|
|
case msgpcode.Uint8, msgpcode.Int8:
|
|
return d.skipN(1)
|
|
case msgpcode.Uint16, msgpcode.Int16:
|
|
return d.skipN(2)
|
|
case msgpcode.Uint32, msgpcode.Int32, msgpcode.Float:
|
|
return d.skipN(4)
|
|
case msgpcode.Uint64, msgpcode.Int64, msgpcode.Double:
|
|
return d.skipN(8)
|
|
case msgpcode.Bin8, msgpcode.Bin16, msgpcode.Bin32:
|
|
return d.skipBytes(c)
|
|
case msgpcode.Str8, msgpcode.Str16, msgpcode.Str32:
|
|
return d.skipBytes(c)
|
|
case msgpcode.Array16, msgpcode.Array32:
|
|
return d.skipSlice(c)
|
|
case msgpcode.Map16, msgpcode.Map32:
|
|
return d.skipMap(c)
|
|
case msgpcode.FixExt1, msgpcode.FixExt2, msgpcode.FixExt4, msgpcode.FixExt8, msgpcode.FixExt16,
|
|
msgpcode.Ext8, msgpcode.Ext16, msgpcode.Ext32:
|
|
return d.skipExt(c)
|
|
}
|
|
|
|
return fmt.Errorf("msgpack: unknown code %x", c)
|
|
}
|
|
|
|
func (d *Decoder) DecodeRaw() (RawMessage, error) {
|
|
d.rec = make([]byte, 0)
|
|
if err := d.Skip(); err != nil {
|
|
return nil, err
|
|
}
|
|
msg := RawMessage(d.rec)
|
|
d.rec = nil
|
|
return msg, nil
|
|
}
|
|
|
|
// PeekCode returns the next MessagePack code without advancing the reader.
|
|
// Subpackage msgpack/codes defines the list of available msgpcode.
|
|
func (d *Decoder) PeekCode() (byte, error) {
|
|
c, err := d.s.ReadByte()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return c, d.s.UnreadByte()
|
|
}
|
|
|
|
// ReadFull reads exactly len(buf) bytes into the buf.
|
|
func (d *Decoder) ReadFull(buf []byte) error {
|
|
_, err := readN(d.r, buf, len(buf))
|
|
return err
|
|
}
|
|
|
|
func (d *Decoder) hasNilCode() bool {
|
|
code, err := d.PeekCode()
|
|
return err == nil && code == msgpcode.Nil
|
|
}
|
|
|
|
func (d *Decoder) readCode() (byte, error) {
|
|
c, err := d.s.ReadByte()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
if d.rec != nil {
|
|
d.rec = append(d.rec, c)
|
|
}
|
|
return c, nil
|
|
}
|
|
|
|
func (d *Decoder) readFull(b []byte) error {
|
|
_, err := io.ReadFull(d.r, b)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if d.rec != nil {
|
|
d.rec = append(d.rec, b...)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (d *Decoder) readN(n int) ([]byte, error) {
|
|
var err error
|
|
d.buf, err = readN(d.r, d.buf, n)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if d.rec != nil {
|
|
// TODO: read directly into d.rec?
|
|
d.rec = append(d.rec, d.buf...)
|
|
}
|
|
return d.buf, nil
|
|
}
|
|
|
|
func readN(r io.Reader, b []byte, n int) ([]byte, error) {
|
|
if b == nil {
|
|
if n == 0 {
|
|
return make([]byte, 0), nil
|
|
}
|
|
switch {
|
|
case n < 64:
|
|
b = make([]byte, 0, 64)
|
|
case n <= bytesAllocLimit:
|
|
b = make([]byte, 0, n)
|
|
default:
|
|
b = make([]byte, 0, bytesAllocLimit)
|
|
}
|
|
}
|
|
|
|
if n <= cap(b) {
|
|
b = b[:n]
|
|
_, err := io.ReadFull(r, b)
|
|
return b, err
|
|
}
|
|
b = b[:cap(b)]
|
|
|
|
var pos int
|
|
for {
|
|
alloc := min(n-len(b), bytesAllocLimit)
|
|
b = append(b, make([]byte, alloc)...)
|
|
|
|
_, err := io.ReadFull(r, b[pos:])
|
|
if err != nil {
|
|
return b, err
|
|
}
|
|
|
|
if len(b) == n {
|
|
break
|
|
}
|
|
pos = len(b)
|
|
}
|
|
|
|
return b, nil
|
|
}
|
|
|
|
func min(a, b int) int { //nolint:unparam
|
|
if a <= b {
|
|
return a
|
|
}
|
|
return b
|
|
}
|