121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
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package common
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import "encoding/binary"
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import "fmt"
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func PrepareKeyToString (_namespace string, _key uint64) (string, error) {
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if _key_0, _error := PrepareKey (_namespace, _key); _error == nil {
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return EncodeKeyToString (_namespace, _key_0)
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} else {
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return "", _error
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}
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}
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func EncodeKeyToString (_namespace string, _key uint64) (string, error) {
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var _buffer [8]byte
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if _error := EncodeKeyToBytes_0 (_namespace, _key, _buffer[:]); _error == nil {
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return string (_buffer[:]), nil
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} else {
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return "", _error
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}
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}
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func EncodeKeyToBytes (_namespace string, _key uint64) ([]byte, error) {
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_buffer := make ([]byte, 8)
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_error := EncodeKeyToBytes_0 (_namespace, _key, _buffer)
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return _buffer, _error
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}
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func EncodeKeyToBytes_0 (_namespace string, _key uint64, _buffer []byte) (error) {
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if len (_buffer) != 8 {
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return fmt.Errorf ("[890eef13] invalid key buffer length!")
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}
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_prefix := keyNamespacePrefix (_namespace)
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if _prefix == 0 {
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return fmt.Errorf ("[feece73b] invalid key namespace `%s`!", _namespace)
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}
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if (_key << 8) == 0 {
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return fmt.Errorf ("[c8fa7817] invalid key zero!")
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}
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_keyPrefix := byte (_key >> 56)
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if _keyPrefix != _prefix {
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return fmt.Errorf ("[85a5c362] invalid key prefix `%0x` for `%d`!", _key, _keyPrefix)
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}
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binary.BigEndian.PutUint64 (_buffer, _key)
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return nil
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}
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func PrepareKey (_namespace string, _key uint64) (uint64, error) {
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if _key == 0 {
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return 0, fmt.Errorf ("[355f64d0] invalid key zero!")
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}
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if _key >= (1 << 24) {
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return 0, fmt.Errorf ("[aba09b4d] invalid key value `%d`!", _key)
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}
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_prefix := keyNamespacePrefix (_namespace)
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if _prefix == 0 {
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return 0, fmt.Errorf ("[feece73b] invalid key namespace `%s`!", _namespace)
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}
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_keyString := fmt.Sprintf ("%08x", _key)
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_keyBytes := []byte (_keyString)
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_keyBytes[0] = _prefix
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_keyValue := binary.BigEndian.Uint64 (_keyBytes)
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return _keyValue, nil
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}
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func keyNamespacePrefix (_namespace string) (byte) {
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switch _namespace {
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case NamespaceFilesContent : return 'f'
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case NamespaceFilesIndex : return 'F'
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case NamespaceFoldersContent : return 'l'
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case NamespaceFoldersIndex : return 'L'
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case NamespaceDataContent : return 'd'
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case NamespaceDataMetadata : return 'm'
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default : return '0'
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}
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}
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func EncodeKeysPairToString (_namespace1 string, _key1 uint64, _namespace2 string, _key2 uint64) (string, error) {
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var _buffer [16]byte
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if _error := EncodeKeyToBytes_0 (_namespace1, _key1, _buffer[0:8]); _error != nil {
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return "", _error
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}
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if _error := EncodeKeyToBytes_0 (_namespace2, _key2, _buffer[8:16]); _error != nil {
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return "", _error
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}
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return string (_buffer[:]), nil
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}
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func DecodeKeysPair (_buffer []byte) (uint64, uint64, error) {
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if len (_buffer) != 16 {
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return 0, 0, fmt.Errorf ("[dd6ba461] invalid key buffer length!")
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}
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_key1 := binary.BigEndian.Uint64 (_buffer[0:8])
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_key2 := binary.BigEndian.Uint64 (_buffer[8:16])
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return _key1, _key2, nil
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}
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