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package protocol
// CompressionMethodID is the ID for a CompressionMethod
type CompressionMethodID byte
const (
compressionMethodNull CompressionMethodID = 0
)
// CompressionMethod represents a TLS Compression Method
type CompressionMethod struct {
ID CompressionMethodID
}
// CompressionMethods returns all supported CompressionMethods
func CompressionMethods() map[CompressionMethodID]*CompressionMethod {
return map[CompressionMethodID]*CompressionMethod{
compressionMethodNull: {ID: compressionMethodNull},
}
}
// DecodeCompressionMethods the given compression methods
func DecodeCompressionMethods(buf []byte) ([]*CompressionMethod, error) {
if len(buf) < 1 {
return nil, errBufferTooSmall
}
compressionMethodsCount := int(buf[0])
c := []*CompressionMethod{}
for i := 0; i < compressionMethodsCount; i++ {
if len(buf) <= i+1 {
return nil, errBufferTooSmall
}
id := CompressionMethodID(buf[i+1])
if compressionMethod, ok := CompressionMethods()[id]; ok {
c = append(c, compressionMethod)
}
}
return c, nil
}
// EncodeCompressionMethods the given compression methods
func EncodeCompressionMethods(c []*CompressionMethod) []byte {
out := []byte{byte(len(c))}
for i := len(c); i > 0; i-- {
out = append(out, byte(c[i-1].ID))
}
return out
}
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