Source File
	decode_string.go

Belonging Package
	github.com/vmihailenco/msgpack/v5

package msgpack

import (
	"fmt"
	"reflect"

	"github.com/vmihailenco/msgpack/v5/msgpcode"
)

func (d *Decoder) bytesLen(c byte) (int, error) {
	if c == msgpcode.Nil {
		return -1, nil
	}

	if msgpcode.IsFixedString(c) {
		return int(c & msgpcode.FixedStrMask), nil
	}

	switch c {
	case msgpcode.Str8, msgpcode.Bin8:
		n, err := d.uint8()
		return int(n), err
	case msgpcode.Str16, msgpcode.Bin16:
		n, err := d.uint16()
		return int(n), err
	case msgpcode.Str32, msgpcode.Bin32:
		n, err := d.uint32()
		return int(n), err
	}

	return 0, fmt.Errorf("msgpack: invalid code=%x decoding string/bytes length", c)
}

func (d *Decoder) DecodeString() (string, error) {
	if intern := d.flags&useInternedStringsFlag != 0; intern || len(d.dict) > 0 {
		return d.decodeInternedString(intern)
	}

	c, err := d.readCode()
	if err != nil {
		return "", err
	}
	return d.string(c)
}

func (d *Decoder) string(c byte) (string, error) {
	n, err := d.bytesLen(c)
	if err != nil {
		return "", err
	}
	return d.stringWithLen(n)
}

func (d *Decoder) stringWithLen(n int) (string, error) {
	if n <= 0 {
		return "", nil
	}
	b, err := d.readN(n)
	return string(b), err
}

func decodeStringValue(d *Decoder, v reflect.Value) error {
	s, err := d.DecodeString()
	if err != nil {
		return err
	}
	v.SetString(s)
	return nil
}

func (d *Decoder) DecodeBytesLen() (int, error) {
	c, err := d.readCode()
	if err != nil {
		return 0, err
	}
	return d.bytesLen(c)
}

func (d *Decoder) DecodeBytes() ([]byte, error) {
	c, err := d.readCode()
	if err != nil {
		return nil, err
	}
	return d.bytes(c, nil)
}

func (d *Decoder) bytes(c byte, b []byte) ([]byte, error) {
	n, err := d.bytesLen(c)
	if err != nil {
		return nil, err
	}
	if n == -1 {
		return nil, nil
	}
	return readN(d.r, b, n)
}

func (d *Decoder) decodeStringTemp() (string, error) {
	if intern := d.flags&useInternedStringsFlag != 0; intern || len(d.dict) > 0 {
		return d.decodeInternedString(intern)
	}

	c, err := d.readCode()
	if err != nil {
		return "", err
	}

	n, err := d.bytesLen(c)
	if err != nil {
		return "", err
	}
	if n == -1 {
		return "", nil
	}

	b, err := d.readN(n)
	if err != nil {
		return "", err
	}

	return bytesToString(b), nil
}

func (d *Decoder) decodeBytesPtr(ptr *[]byte) error {
	c, err := d.readCode()
	if err != nil {
		return err
	}
	return d.bytesPtr(c, ptr)
}

func (d *Decoder) bytesPtr(c byte, ptr *[]byte) error {
	n, err := d.bytesLen(c)
	if err != nil {
		return err
	}
	if n == -1 {
		*ptr = nil
		return nil
	}

	*ptr, err = readN(d.r, *ptr, n)
	return err
}

func (d *Decoder) skipBytes(c byte) error {
	n, err := d.bytesLen(c)
	if err != nil {
		return err
	}
	if n <= 0 {
		return nil
	}
	return d.skipN(n)
}

func decodeBytesValue(d *Decoder, v reflect.Value) error {
	c, err := d.readCode()
	if err != nil {
		return err
	}

	b, err := d.bytes(c, v.Bytes())
	if err != nil {
		return err
	}

	v.SetBytes(b)

	return nil
}

func decodeByteArrayValue(d *Decoder, v reflect.Value) error {
	c, err := d.readCode()
	if err != nil {
		return err
	}

	n, err := d.bytesLen(c)
	if err != nil {
		return err
	}
	if n == -1 {
		return nil
	}
	if n > v.Len() {
		return fmt.Errorf("%s len is %d, but msgpack has %d elements", v.Type(), v.Len(), n)
	}

	b := v.Slice(0, n).Bytes()
	return d.readFull(b)
}

The pages are generated with Golds v0.8.2. (GOOS=linux GOARCH=amd64)
Golds is a Go 101 project developed by Tapir Liu.
PR and bug reports are welcome and can be submitted to the issue list.
Please follow @zigo_101 (reachable from the left QR code) to get the latest news of Golds.