| 120 | } |
| 121 | |
| 122 | func BytesToDataUpload(dataType DataUploadType, data []byte) (*DataUpload, []*ChunkPiece, error) { |
| 123 | if int64(len(data)) > MaxFileSize { |
| 124 | return nil, nil, xerrors.Errorf("data size %d exceeds maximum allowed %d", len(data), MaxFileSize) |
| 125 | } |
| 126 | |
| 127 | fullHash := sha256.Sum256(data) |
| 128 | //nolint:gosec // not going over int32 |
| 129 | size := int32(len(data)) |
| 130 | // basically ceiling division to get the number of chunks required to |
| 131 | // hold the data, each chunk is ChunkSize bytes. |
| 132 | chunkCount := (size + ChunkSize - 1) / ChunkSize |
| 133 | |
| 134 | req := &DataUpload{ |
| 135 | DataHash: fullHash[:], |
| 136 | FileSize: int64(size), |
| 137 | Chunks: chunkCount, |
| 138 | UploadType: dataType, |
| 139 | } |
| 140 | |
| 141 | chunks := make([]*ChunkPiece, 0, chunkCount) |
| 142 | for i := int32(0); i < chunkCount; i++ { |
| 143 | start := int64(i) * ChunkSize |
| 144 | end := start + ChunkSize |
| 145 | if end > int64(size) { |
| 146 | end = int64(size) |
| 147 | } |
| 148 | chunkData := data[start:end] |
| 149 | |
| 150 | chunk := &ChunkPiece{ |
| 151 | PieceIndex: i, |
| 152 | Data: chunkData, |
| 153 | FullDataHash: fullHash[:], |
| 154 | } |
| 155 | chunks = append(chunks, chunk) |
| 156 | } |
| 157 | |
| 158 | return req, chunks, nil |
| 159 | } |