forked from quic-go/quic-go
49 lines
1.2 KiB
Go
49 lines
1.2 KiB
Go
package protocol
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
)
|
|
|
|
// VersionNumber is a version number as int
|
|
type VersionNumber int
|
|
|
|
// SupportedVersions lists the versions that the server supports
|
|
var SupportedVersions = []VersionNumber{
|
|
30, 31, 32, 33,
|
|
}
|
|
|
|
// SupportedVersionsAsTags is needed for the SHLO crypto message
|
|
var SupportedVersionsAsTags []byte
|
|
|
|
// VersionNumberToTag maps version numbers ('32') to tags ('Q032')
|
|
func VersionNumberToTag(vn VersionNumber) uint32 {
|
|
v := uint32(vn)
|
|
return 'Q' + ((v/100%10)+'0')<<8 + ((v/10%10)+'0')<<16 + ((v%10)+'0')<<24
|
|
}
|
|
|
|
// VersionTagToNumber is built from VersionNumberToTag in init()
|
|
func VersionTagToNumber(v uint32) VersionNumber {
|
|
return VersionNumber(((v>>8)&0xff-'0')*100 + ((v>>16)&0xff-'0')*10 + ((v>>24)&0xff - '0'))
|
|
}
|
|
|
|
// IsSupportedVersion returns true if the server supports this version
|
|
func IsSupportedVersion(v VersionNumber) bool {
|
|
for _, t := range SupportedVersions {
|
|
if t == v {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func init() {
|
|
var b bytes.Buffer
|
|
for _, v := range SupportedVersions {
|
|
s := make([]byte, 4)
|
|
binary.LittleEndian.PutUint32(s, VersionNumberToTag(v))
|
|
b.Write(s)
|
|
}
|
|
SupportedVersionsAsTags = b.Bytes()
|
|
}
|