99 lines
3.0 KiB
Protocol Buffer
99 lines
3.0 KiB
Protocol Buffer
|
/*
|
||
|
|
Copyright (C) 2010 Srivats P.
|
||
|
|
|
||
|
|
This file is part of "Ostinato"
|
||
|
|
|
||
|
|
This is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation, either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>
|
||
|
|
*/
|
||
|
|
|
||
|
|
import "protocol.proto";
|
||
|
|
|
||
|
|
package OstProto;
|
||
|
|
|
||
|
|
enum FileType {
|
||
|
|
kReservedFileType = 0;
|
||
|
|
kStreamsFileType = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
message FileMetaData {
|
||
|
|
required FileType file_type = 1;
|
||
|
|
required uint32 format_version_major = 2;
|
||
|
|
required uint32 format_version_minor = 3;
|
||
|
|
required uint32 format_version_revision = 4;
|
||
|
|
required string generator_name = 5;
|
||
|
|
required string generator_version = 6;
|
||
|
|
required string generator_revision = 7;
|
||
|
|
}
|
||
|
|
|
||
|
|
message FileContentMatter {
|
||
|
|
optional StreamConfigList streams = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
An Ostinato file is the binary encoding of the File message below
|
||
|
|
STRICTLY in increasing order of field number for the top level fields
|
||
|
|
|
||
|
|
We do not use field number '1' for magic value because its encoded key
|
||
|
|
is '0a' (LF or \n) which occurs commonly in text files. Checksum should
|
||
|
|
be the last field, so top level field numbers greater than 15 are not
|
||
|
|
permitted. We use 15 as the checksum field number because it is the
|
||
|
|
largest field number that can fit in a 1-byte tag
|
||
|
|
|
||
|
|
The magic value is of a fixed length so that meta data has a fixed offset
|
||
|
|
from the start in the encoded message.
|
||
|
|
|
||
|
|
Checksum is fixed length so that it is at a fixed negative offset from
|
||
|
|
the end in the encoded message.
|
||
|
|
|
||
|
|
Because the protobuf serialization API does not _guarantee_
|
||
|
|
strict ordering, so we define wrapper messages for each top level field
|
||
|
|
and serialize the individual wrapper messages. The field numbers MUST
|
||
|
|
be the same in 'File' and the wrapper messages
|
||
|
|
*/
|
||
|
|
message File {
|
||
|
|
// FieldNumber 1 is reserved and MUST not be used!
|
||
|
|
required bytes magic_value = 2;
|
||
|
|
required FileMetaData meta_data = 3;
|
||
|
|
optional FileContent content_matter = 9;
|
||
|
|
required fixed32 checksum_value = 15;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
The magic value is 10 bytes - "\xa7\xb7OSTINATO"
|
||
|
|
The 1st-2nd byte has the MSB set to avoid mixup with text files
|
||
|
|
The 3rd-10th byte spell OSTINATO (duh!)
|
||
|
|
|
||
|
|
Encoded Size : Key(1) + Length(1) + Value(10) = 12 bytes
|
||
|
|
Encoded Value: 120aa7b7 4f535449 4e41544f
|
||
|
|
*/
|
||
|
|
message FileMagic {
|
||
|
|
required bytes value = 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
message FileMeta {
|
||
|
|
required FileMetaData data = 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
message FileContent {
|
||
|
|
optional FileContentMatter matter = 9;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Encoded Size : Key(1) + Value(4) = 5 bytes
|
||
|
|
Encoded Value: 7d xxXXxxXX
|
||
|
|
*/
|
||
|
|
message FileChecksum {
|
||
|
|
required fixed32 value = 15; // should always be a fixed 32-bit size
|
||
|
|
}
|