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