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Slightly speed up IntegrityVerificationStorage

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This commit is contained in:
Alex Barney 2019-01-21 12:57:40 -06:00
parent 39f952015f
commit b6964589fa
1 changed files with 19 additions and 5 deletions
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24
src/LibHac/IO/IntegrityVerificationStorage.cs
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@ -31,6 +31,7 @@ namespace LibHac.IO
BlockValidities = new Validity[SectorCount];
}
// todo Take short path when integrity checks are disabled
private void ReadImpl(Span<byte> destination, long offset, IntegrityCheckLevel integrityCheckLevel)
{
int count = destination.Length;
@ -38,15 +39,29 @@ namespace LibHac.IO
if (count < 0 || count > SectorSize)
throw new ArgumentOutOfRangeException(nameof(destination), "Length is invalid.");
Span<byte> hashBuffer = stackalloc byte[DigestSize];
long blockIndex = offset / SectorSize;
long hashPos = blockIndex * DigestSize;
if (BlockValidities[blockIndex] == Validity.Invalid && integrityCheckLevel == IntegrityCheckLevel.ErrorOnInvalid)
{
throw new InvalidDataException("Hash error!");
}
if (Type != IntegrityStorageType.Save && integrityCheckLevel == IntegrityCheckLevel.None)
{
BaseStorage.Read(destination, offset);
return;
}
if (BlockValidities[blockIndex] != Validity.Unchecked)
{
BaseStorage.Read(destination, offset);
return;
}
Span<byte> hashBuffer = stackalloc byte[DigestSize];
long hashPos = blockIndex * DigestSize;
HashStorage.Read(hashBuffer, hashPos);
if (Type == IntegrityStorageType.Save && Util.IsEmpty(hashBuffer))
@ -59,10 +74,9 @@ namespace LibHac.IO
byte[] dataBuffer = ArrayPool<byte>.Shared.Rent(SectorSize);
try
{
BaseStorage.Read(dataBuffer, offset, count, 0);
dataBuffer.AsSpan(0, count).CopyTo(destination);
BaseStorage.Read(destination, offset);
destination.CopyTo(dataBuffer);
if (integrityCheckLevel == IntegrityCheckLevel.None) return;
if (BlockValidities[blockIndex] != Validity.Unchecked) return;
int bytesToHash = SectorSize;