55 lines
2.5 KiB
C#
55 lines
2.5 KiB
C#
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using System;
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using UnityEditor.Build.Content;
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using UnityEditor.Build.Pipeline.Interfaces;
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using UnityEditor.Build.Pipeline.Utilities;
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namespace UnityEditor.Build.Pipeline
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{
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/// <summary>
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/// Generates a deterministic identifier using a MD4 hash algorithm and does not require object ordering to be deterministic.
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/// This algorithm generates identical results to what is used internally in <c>BuildPipeline.BuildAssetbundles</c>.
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/// </summary>
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public class Unity5PackedIdentifiers : IDeterministicIdentifiers
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{
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/// <inheritdoc />
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public virtual string GenerateInternalFileName(string name)
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{
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return "CAB-" + HashingMethods.Calculate<MD4>(name);
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}
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/// <inheritdoc />
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public virtual long SerializationIndexFromObjectIdentifier(ObjectIdentifier objectID)
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{
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RawHash hash;
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bool extraArtifact = objectID.filePath.StartsWith("VirtualArtifacts/Extra/", StringComparison.Ordinal);
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int hashSeed = ScriptableBuildPipeline.fileIDHashSeed;
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if (extraArtifact && hashSeed != 0)
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{
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RawHash fileHash = HashingMethods.CalculateFile(objectID.filePath);
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hash = HashingMethods.Calculate(hashSeed, fileHash, objectID.localIdentifierInFile);
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}
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else if (extraArtifact)
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{
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RawHash fileHash = HashingMethods.CalculateFile(objectID.filePath);
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hash = HashingMethods.Calculate(fileHash, objectID.localIdentifierInFile);
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}
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else if (hashSeed != 0)
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{
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if (objectID.fileType == FileType.MetaAssetType || objectID.fileType == FileType.SerializedAssetType)
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hash = HashingMethods.Calculate<MD4>(hashSeed, objectID.guid.ToString(), objectID.fileType, objectID.localIdentifierInFile);
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else
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hash = HashingMethods.Calculate<MD4>(hashSeed, objectID.filePath, objectID.localIdentifierInFile);
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}
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else
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{
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if (objectID.fileType == FileType.MetaAssetType || objectID.fileType == FileType.SerializedAssetType)
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hash = HashingMethods.Calculate<MD4>(objectID.guid.ToString(), objectID.fileType, objectID.localIdentifierInFile);
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else
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hash = HashingMethods.Calculate<MD4>(objectID.filePath, objectID.localIdentifierInFile);
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}
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return BitConverter.ToInt64(hash.ToBytes(), 0);
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}
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}
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}
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