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db.go
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db.go
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// the qqwry.dat file format is intrudced in http://blog.csdn.net/cnss/article/details/77628
// the qqwry.dat file can be download from http://www.cz88.net/
package qqwry
import (
"errors"
"fmt"
"os"
"strconv"
"strings"
)
func toOffest3(b []byte, o int) int {
return int(b[o+0]) | int(b[o+1])<<8 | int(b[o+2])<<16
}
func toOffest4(b []byte, o int) int {
return int(b[o+0]) | int(b[o+1])<<8 | int(b[o+2])<<16 | int(b[o+3])<<24
}
func ip2str(ip []byte) string {
return fmt.Sprintf("%d.%d.%d.%d", ip[3], ip[2], ip[1], ip[0])
}
func parseIp(ip string) (int, error) {
a := strings.Split(ip, ".")
if len(a) != 4 {
return 0, errors.New("invalid ip format")
}
b := make([]byte, 4)
for i := 0; i < 4; i++ {
n, e := strconv.Atoi(a[3-i])
if e != nil {
return 0, e
}
b[i] = byte(n)
}
return toOffest4(b, 0), nil
}
// the qqwry.dat database
type Db struct {
qqwry []byte
}
func NewDb(path string) (*Db, error) {
db := new(Db)
err := db.doinit(path)
if err != nil {
return nil, err
}
return db, nil
}
func (self *Db) doinit(path string) error {
if self.qqwry != nil {
return nil
}
fi, err := os.Lstat(path)
if err != nil {
return err
}
file, err := os.Open(path)
if err != nil {
return nil
}
defer file.Close()
self.qqwry = make([]byte, fi.Size())
_, err = file.Read(self.qqwry)
if err != nil {
self.qqwry = nil
return err
}
return nil
}
func (self *Db) readIp(o int) (start, end, country, area []byte) {
qqwry := self.qqwry
start = qqwry[o : o+4]
o = toOffest3(qqwry, o+4)
end = qqwry[o : o+4]
country, area = self.readInfo(o + 4)
return start, end, country, area
}
func (self *Db) readText(o int) (int, []byte) {
qqwry := self.qqwry
if qqwry[o] == 0x02 {
o = toOffest3(qqwry, o+1)
_, t := self.readText(o)
return 4, t
} else {
e := o
for ; qqwry[e] != 0; e++ {
}
return e - o + 1, qqwry[o:e]
}
}
func (self *Db) readInfo(o int) (country, area []byte) {
qqwry := self.qqwry
if qqwry[o] == 0x01 {
o = toOffest3(qqwry, o+1)
return self.readInfo(o)
}
n, country := self.readText(o)
_, area = self.readText(o + n)
return country, area
}
// dump db contents as csv format to console
func (self *Db) Dump() {
qqwry := self.qqwry
o := toOffest4(qqwry, 0)
e := toOffest4(qqwry, 4)
for ; o < e; o += 7 {
start, end, country, area := self.readIp(o)
fmt.Println(ip2str(start), ip2str(end), GbkString(country), GbkString(area))
}
}
// search a ip , return it's country and area when found
// return "Unknown Unknown" when not found
func (self *Db) Search(ip string) (string, string) {
qqwry := self.qqwry
nip, err := parseIp(ip)
if err != nil {
return "Unknown", "Unknown"
}
o := toOffest4(qqwry, 0)
e := toOffest4(qqwry, 4)
last := (e - o) / 7
first := 0
mid := (last - first) / 2
for {
val := toOffest4(qqwry, o+mid*7)
if nip > val {
first = mid
mid = first + (last-first)/2
}
if nip < val {
last = mid
mid = first + (last-first)/2
}
if mid == first {
break
}
}
_, _, country, area := self.readIp(o + mid*7)
return GbkString(country), GbkString(area)
}