| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * https://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| namespace Avro.File |
| { |
| /// <summary> |
| /// Constants used in data files. |
| /// </summary> |
| public class DataFileConstants |
| { |
| /// <summary> |
| /// Key for the 'sync' metadata entry. |
| /// </summary> |
| public const string MetaDataSync = "avro.sync"; |
| |
| /// <summary> |
| /// Key for the 'codec' metadata entry. |
| /// </summary> |
| public const string MetaDataCodec = "avro.codec"; |
| |
| /// <summary> |
| /// Key for the 'schema' metadata entry. |
| /// </summary> |
| public const string MetaDataSchema = "avro.schema"; |
| |
| /// <summary> |
| /// Identifier for the null codec. |
| /// </summary> |
| public const string NullCodec = "null"; |
| |
| /// <summary> |
| /// Identifier for the deflate codec. |
| /// </summary> |
| public const string DeflateCodec = "deflate"; |
| |
| /// <summary> |
| /// Identifier for the Snappy codec. |
| /// </summary> |
| public const string SnappyCodec = "snappy"; |
| |
| /// <summary> |
| /// Identifier for the BZip2 codec. |
| /// </summary> |
| public const string BZip2Codec = "bzip2"; |
| |
| /// <summary> |
| /// Identifier for the XZ codec. |
| /// </summary> |
| public const string XZCodec = "xz"; |
| |
| /// <summary> |
| /// Identifier for the Zstandard codec. |
| /// </summary> |
| public const string ZstandardCodec = "zstandard"; |
| |
| /// <summary> |
| /// Reserved 'avro' metadata key. |
| /// </summary> |
| public const string MetaDataReserved = "avro"; |
| |
| /// <summary> |
| /// Avro specification version. |
| /// </summary> |
| public const int Version = 1; |
| |
| /// <summary> |
| /// Magic bytes at the beginning of an Avro data file. |
| /// </summary> |
| public static readonly byte[] Magic = |
| { |
| (byte)'O', |
| (byte)'b', |
| (byte)'j', |
| Version, |
| }; |
| |
| /// <summary> |
| /// Hash code for the null codec. |
| /// </summary> |
| /// <seealso cref="NullCodec.GetHashCode()"/> |
| public const int NullCodecHash = 2; |
| |
| /// <summary> |
| /// Hash code for the deflate codec. |
| /// </summary> |
| /// <seealso cref="DeflateCodec.GetHashCode()"/> |
| public const int DeflateCodecHash = 0; |
| |
| /// <summary> |
| /// Size of a sync token in bytes. |
| /// </summary> |
| public const int SyncSize = 16; |
| |
| /// <summary> |
| /// Default interval for sync tokens. |
| /// </summary> |
| public const int DefaultSyncInterval = 4000 * SyncSize; |
| } |
| } |