public bool TryResolve(FIoChunkId chunkId, out FIoOffsetAndLength outOffsetLength)
{
if (TocResource.ChunkPerfectHashSeeds != null)
{
var chunkCount = TocResource.Header.TocEntryCount;
if (chunkCount == 0)
{
outOffsetLength = default;
return(false);
}
var seedCount = (uint)TocResource.ChunkPerfectHashSeeds.Length;
var seedIndex = (uint)(chunkId.HashWithSeed(0) % seedCount);
var seed = TocResource.ChunkPerfectHashSeeds[seedIndex];
if (seed == 0)
{
outOffsetLength = default;
return(false);
}
uint slot;
if (seed < 0)
{
var seedAsIndex = (uint)(-seed - 1);
if (seedAsIndex < chunkCount)
{
slot = seedAsIndex;
}
else
{
// Entry without perfect hash
return(TryResolveImperfect(chunkId, out outOffsetLength));
}
}
else
{
slot = (uint)(chunkId.HashWithSeed(seed) % chunkCount);
}
if (TocResource.ChunkIds[slot].GetHashCode() == chunkId.GetHashCode())
{
outOffsetLength = TocResource.ChunkOffsetLengths[slot];
return(true);
}
outOffsetLength = default;
return(false);
}
return(TryResolveImperfect(chunkId, out outOffsetLength));
}
private bool TryResolveImperfect(FIoChunkId chunkId, out FIoOffsetAndLength outOffsetLength)
{
if (TocImperfectHashMapFallback != null)
{
return(TocImperfectHashMapFallback.TryGetValue(chunkId, out outOffsetLength));
}
var chunkIndex = Array.IndexOf(TocResource.ChunkIds, chunkId);
if (chunkIndex == -1)
{
outOffsetLength = default;
return(false);
}
outOffsetLength = TocResource.ChunkOffsetLengths[chunkIndex];
return(true);
}