package q5

import "io"
import "strings"
import "crypto/md5"
import "encoding/hex"
import "hash/crc32"

const (
	JSON_NONE = 0
	JSON_ARRAY = iota
	JSON_OBJECT = iota
)

func Md5Str(data string) string {
	h := md5.New()
	h.Write([]byte(data))
	return hex.EncodeToString(h.Sum(nil))
}

func Crc32(data string) uint32 {
	ieee := crc32.NewIEEE()
	io.WriteString(ieee, data)

	code := ieee.Sum32()
	return code
}

func JsonStrType(data string) int32 {
	arrayIdx := strings.IndexByte(data, '[')
	objectIdx := strings.IndexByte(data, '{')
	if arrayIdx < 0 && objectIdx < 0 {
		return JSON_NONE
	} else {
		if arrayIdx < 0 {
			return JSON_OBJECT
		}
		if objectIdx < 0 {
			return JSON_ARRAY
		}
		if arrayIdx < objectIdx {
			return JSON_ARRAY
		} else {
			return JSON_OBJECT
		}
	}
}