| 74 | } |
| 75 | |
| 76 | func (fi *fileIndex) verifyFileHeader() error { |
| 77 | // Verify file signature |
| 78 | signature := make([]byte, 4) |
| 79 | if _, err := fi.reader.ReadAt(signature, 0); err != nil { |
| 80 | return err |
| 81 | } |
| 82 | if !bytes.Equal(signature, commitFileSignature) { |
| 83 | return ErrMalformedCommitGraphFile |
| 84 | } |
| 85 | |
| 86 | // Read and verify the file header |
| 87 | header := make([]byte, 4) |
| 88 | if _, err := fi.reader.ReadAt(header, 4); err != nil { |
| 89 | return err |
| 90 | } |
| 91 | if header[0] != 1 { |
| 92 | return ErrUnsupportedVersion |
| 93 | } |
| 94 | if hash.CryptoType == crypto.SHA1 { |
| 95 | if header[1] != 1 { |
| 96 | return ErrUnsupportedVersion |
| 97 | } |
| 98 | } else if hash.CryptoType == crypto.SHA256 { |
| 99 | if header[1] != 2 { |
| 100 | return ErrUnsupportedVersion |
| 101 | } |
| 102 | } else { |
| 103 | // Unknown hash type |
| 104 | return ErrUnsupportedVersion |
| 105 | } |
| 106 | |
| 107 | return nil |
| 108 | } |
| 109 | |
| 110 | func (fi *fileIndex) readChunkHeaders() error { |
| 111 | chunkID := make([]byte, 4) |