refactor: Decompose archive func

pkg/config/constants.go

@@ -16,4 +16,8 @@ const (
 
 	SignatureFormatMinisignKey = "minisign"
 	SignatureFormatPGPKey      = "pgp"
+
+	CompressionLevelFastest  = "fastest"
+	CompressionLevelBalanced = "balanced"
+	CompressionLevelSmallest = "smallest"
 )

pkg/config/error.go

@@ -3,18 +3,22 @@ package config
 import "errors"
 
 var (
-	ErrUnsupportedCompressionFormat = errors.New("unsupported compression format")
-	ErrUnsupportedEncryptionFormat  = errors.New("unsupported encryption format")
-	ErrUnsupportedSignatureFormat   = errors.New("unsupported signature format")
+	ErrEncryptionFormatUnsupported = errors.New("unsupported encryption format")
 
 	ErrIdentityUnparsable  = errors.New("recipient could not be parsed")
 	ErrRecipientUnparsable = errors.New("recipient could not be parsed")
 
 	ErrEmbeddedHeaderMissing = errors.New("embedded header is missing")
 
+	ErrSignatureFormatUnsupported        = errors.New("unsupported signature format")
 	ErrSignatureFormatOnlyRegularSupport = errors.New("this signature format only supports regular files, not i.e. tape drives")
-	ErrSignatureInvalid                  = errors.New("signature invalid")
-	ErrSignatureMissing                  = errors.New("signature missing")
+	ErrSignatureInvalid                  = errors.New("signature is invalid")
+	ErrSignatureMissing                  = errors.New("signature is missing")
 
 	ErrKeygenForFormatUnsupported = errors.New("can not generate keys for this format")
+
+	ErrCompressionFormatUnsupported              = errors.New("unsupported compression format")
+	ErrCompressionFormatOnlyRegularSupport       = errors.New("this compression format only supports regular files, not i.e. tape drives")
+	ErrCompressionFormatRequiresLargerRecordSize = errors.New("this compression format requires a larger record size")
+	ErrCompressionLevelUnsupported               = errors.New("compression level is unsupported")
 )