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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 syntax = "proto2"; | |
6 | |
7 option optimize_for = LITE_RUNTIME; | |
8 option retain_unknown_fields = true; | |
9 | |
10 package attachment_store_pb; | |
11 | |
12 // Metadata for leveldb attachment store database. | |
13 message StoreMetadata { | |
14 // |schema_version| indicates format in which data is written in attachment | |
15 // store. Needed for upgrade and to prevent newer data from being loaded by | |
16 // older code that doesn't understand it. | |
17 optional int32 schema_version = 1; | |
18 } | |
19 | |
20 // Metadata for attachment in attachment store. Storing metadata in separate | |
21 // record from actual data allows us to enumerate attachments in the store | |
22 // without incurring cost to read actual data. It also allows us to update | |
23 // attachment metadata independent of the data. | |
24 message RecordMetadata { | |
25 // Size of attachment data. Useful for attachment store space management. | |
26 optional int64 attachment_size = 1; | |
27 // Crc32c of attachment data. | |
28 optional fixed32 crc32c = 2; | |
29 | |
30 // Component enum mirrors values of AttachmentStore::Component. | |
31 enum Component { | |
32 UNKNOWN = 0; | |
33 MODEL_TYPE = 1; | |
34 SYNC = 2; | |
35 } | |
36 // Set of components that reference this attachment. | |
37 repeated Component component = 3; | |
38 } | |
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