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55 lines
1.7 KiB
Go
55 lines
1.7 KiB
Go
package protocol
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// VersionNumber is a version number as int
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type VersionNumber int
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// The version numbers, making grepping easier
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const (
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Version35 VersionNumber = 35 + iota
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Version36
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Version37
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VersionWhatever VersionNumber = 0 // for when the version doesn't matter
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VersionUnsupported VersionNumber = -1
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)
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// SupportedVersions lists the versions that the server supports
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// must be in sorted descending order
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var SupportedVersions = []VersionNumber{
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Version37, Version36, Version35,
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}
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// VersionNumberToTag maps version numbers ('32') to tags ('Q032')
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func VersionNumberToTag(vn VersionNumber) uint32 {
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v := uint32(vn)
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return 'Q' + ((v/100%10)+'0')<<8 + ((v/10%10)+'0')<<16 + ((v%10)+'0')<<24
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}
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// VersionTagToNumber is built from VersionNumberToTag in init()
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func VersionTagToNumber(v uint32) VersionNumber {
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return VersionNumber(((v>>8)&0xff-'0')*100 + ((v>>16)&0xff-'0')*10 + ((v>>24)&0xff - '0'))
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}
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// IsSupportedVersion returns true if the server supports this version
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func IsSupportedVersion(supported []VersionNumber, v VersionNumber) bool {
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for _, t := range supported {
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if t == v {
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return true
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}
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}
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return false
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}
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// ChooseSupportedVersion finds the best version in the overlap of ours and theirs
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// ours is a slice of versions that we support, sorted by our preference (descending)
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// theirs is a slice of versions offered by the peer. The order does not matter
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// if no suitable version is found, it returns VersionUnsupported
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func ChooseSupportedVersion(ours, theirs []VersionNumber) VersionNumber {
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for _, ourVer := range ours {
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for _, theirVer := range theirs {
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if ourVer == theirVer {
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return ourVer
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}
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}
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}
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return VersionUnsupported
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}
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