| 12 | } |
| 13 | |
| 14 | void OffsetMap::build(const StoredObjects & objects) |
| 15 | { |
| 16 | segments.clear(); |
| 17 | total_size = 0; |
| 18 | |
| 19 | for (const auto & obj : objects) |
| 20 | { |
| 21 | if (obj.bytes_size == StoredObject::UnknownSize) |
| 22 | { |
| 23 | /// An unknown-size object must appear alone: logical offsets for |
| 24 | /// anything following it cannot be computed. |
| 25 | if (objects.size() != 1) |
| 26 | throw Exception(ErrorCodes::BAD_ARGUMENTS, |
| 27 | "OffsetMap: unknown-size object is only supported in single-object pipelines (got {} objects)", |
| 28 | objects.size()); |
| 29 | total_size = StoredObject::UnknownSize; |
| 30 | segments.push_back(Segment{ |
| 31 | .object = obj, |
| 32 | .logical_offset = 0, |
| 33 | .size = StoredObject::UnknownSize, |
| 34 | }); |
| 35 | return; |
| 36 | } |
| 37 | segments.push_back(Segment{ |
| 38 | .object = obj, |
| 39 | .logical_offset = total_size, |
| 40 | .size = obj.bytes_size, |
| 41 | }); |
| 42 | total_size += obj.bytes_size; |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | const StoredObject * OffsetMap::findObjectAt(size_t logical_offset, size_t * object_logical_start_offset) const |
| 47 | { |