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save version numbers such that can be written in big endian

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This makes the version number representation consistent with the IETF
draft.
This commit is contained in:
Marten Seemann
2017-10-24 10:45:08 +07:00
parent e81795e49b
commit d98a11bb35
18 changed files with 68 additions and 65 deletions
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28
internal/protocol/version.go
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@@ -1,13 +1,19 @@
package protocol
import "fmt"
import (
"fmt"
)
// VersionNumber is a version number as int
type VersionNumber int
// gquicVersion0 is the "base" for gQUIC versions
// e.g. version 39 is gquicVersion + 0x39
const gquicVersion0 = 0x51303300
// The version numbers, making grepping easier
const (
Version37 VersionNumber = 37 + iota
Version37 VersionNumber = gquicVersion0 + 0x37 + iota
Version38
Version39
VersionTLS VersionNumber = 101
@@ -40,19 +46,19 @@ func (vn VersionNumber) String() string {
case VersionTLS:
return "TLS dev version (WIP)"
default:
if vn > gquicVersion0 && vn <= gquicVersion0+0x99 {
return fmt.Sprintf("gQUIC %x", uint32(vn-gquicVersion0))
}
return fmt.Sprintf("%d", vn)
}
}
// 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'))
// ToAltSvc returns the representation of the version for the H2 Alt-Svc parameters
func (vn VersionNumber) ToAltSvc() string {
if vn > gquicVersion0 && vn <= gquicVersion0+0x99 {
return fmt.Sprintf("%x", uint32(vn-gquicVersion0))
}
return fmt.Sprintf("%d", vn)
}
// IsSupportedVersion returns true if the server supports this version