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