// the prefix of `text`, otherwise it must be a substring.
func matcher(text, pat string, leadingPercent bool) (res string, match bool) {
	if !leadingPercent {
		res = strings.TrimPrefix(text, pat)
		if len(text) == len(res) {
			return "", false
		}
	} else {
		parts := strings.SplitN(text, pat, 2)
		if len(parts) == 1 {
			return "", false
		}
		res = parts[1]
	}

		return formatUnknown
	}
	for _, f := range magicHeaders {
		if bytes.Equal(f.header, z[:len(f.header)]) {
			return f.f
		}
	}
	return formatUnknown
}

//go:generate stringer -type=format -trimprefix=format $GOFILE
type format int

const (
	formatUnknown format = iota
	formatGzip
	formatZstd
	formatLZ4
	formatS2
	formatBZ2
)

var magicHeaders = []struct {
	header []byte
	f      format

	if !strings.HasPrefix(s, DestinationARNPrefix) && !strings.HasPrefix(s, DestinationARNMinIOPrefix) {
		return Destination{}, Errorf("invalid destination '%s'", s)
	}

	bucketName := strings.TrimPrefix(s, DestinationARNPrefix)

	return Destination{
		Bucket: bucketName,
		ARN:    s,
	}, nil

		Message string `xml:"Message"`
	} `xml:"Error"`
	RequestID string `xml:"RequestId"`
}

// STSErrorCode type of error status.
type STSErrorCode int

//go:generate stringer -type=STSErrorCode -trimprefix=Err $GOFILE

// Error codes, non exhaustive list - http://docs.aws.amazon.com/STS/latest/APIReference/API_AssumeRoleWithSAML.html
const (
	ErrSTSNone STSErrorCode = iota
	ErrSTSAccessDenied
	ErrSTSMissingParameter

	case usersPrefix:
		accessKey := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigUsersPrefix))
		err = sys.store.UserNotificationHandler(ctx, accessKey, regUser)
	case stsPrefix:
		accessKey := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigSTSPrefix))
		err = sys.store.UserNotificationHandler(ctx, accessKey, stsUser)
	case svcPrefix:
		accessKey := path.Dir(strings.TrimPrefix(event.keyPath, iamConfigServiceAccountsPrefix))

							// set, go to the next set
							continue
						}

						for id, usageInfo := range cache.flattenChildrens(*root) {
							prefix := decodeDirObject(strings.TrimPrefix(id, bucket+slashSeparator))
							// decodeDirObject to avoid any __XLDIR__ objects
							m[prefix] += uint64(usageInfo.Size)
						}
					}
				}
			}
			return m, nil
		},
	)

			encMetadata[k] = v
		}
	}

	if (sseKMS || sseS3) && r.Encryption.Type == ssekms {
		if err = r.Encryption.Validate(); err != nil {
			return err
		}
		newKeyID = strings.TrimPrefix(r.Encryption.Key, crypto.ARNPrefix)
		newKeyContext = r.Encryption.kmsContext
	}
	if err = rotateKey(ctx, []byte{}, newKeyID, []byte{}, r.Bucket, oi.Name, encMetadata, newKeyContext); err != nil {
		return err
	}

}

// SchemaName generate schema name from table name, don't guarantee it is the reverse value of TableName
func (ns NamingStrategy) SchemaName(table string) string {
	table = strings.TrimPrefix(table, ns.TablePrefix)

	if ns.SingularTable {
		return ns.toSchemaName(table)
	}
	return ns.toSchemaName(inflection.Singular(table))
}

// ColumnName convert string to column name

// If the SSE configuration does not specify SSE-KMS it returns an
// empty key ID.
func (b *BucketSSEConfig) KeyID() string {
	for _, rule := range b.Rules {
		return strings.TrimPrefix(rule.DefaultEncryptionAction.MasterKeyID, crypto.ARNPrefix)
	}
	return ""

	{"TrimRight", []byte{'a'}, "ab", []byte{}},
	{"TrimRight", []byte{'a', 'b'}, "ab", []byte{}},
	{"TrimRight", []byte("☺"), "☺", []byte{}},
	{"TrimPrefix", nil, "", nil},
	{"TrimPrefix", []byte{}, "", []byte{}},
	{"TrimPrefix", []byte{'a'}, "a", []byte{}},
	{"TrimPrefix", []byte("☺"), "☺", []byte{}},
	{"TrimSuffix", nil, "", nil},
	{"TrimSuffix", []byte{}, "", []byte{}},
	{"TrimSuffix", []byte{'a'}, "a", []byte{}},