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Add SdCardPrivate

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Alex Barney 2023-02-05 20:48:05 -07:00
parent fa9d5422cf
commit 7005676777
1 changed files with 80 additions and 0 deletions
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src/LibHac/Fs/Shim/SdCardPrivate.cs Normal file
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using System;
using LibHac.Diag;
namespace LibHac.Fs.Shim;
public static class SdCardPrivate
{
public const int SdCardCidSize = 16;
public const int SdCardCidPnmSize = 5;
public const int SdCardCidOidSize = 2;
private const int SdCardCidMdtMonthCodeIndex = 0;
private const int SdCardCidMdtYearCodeLowerIndex = 0;
private const int SdCardCidMdtYearCodeUpperIndex = 1;
private const int SdCardCidPsnIndex = 2;
private const int SdCardCidPrvIndex = 6;
private const int SdCardCidPnmIndex = 7;
private const int SdCardCidOidIndex = 12;
private const int SdCardCidMidIndex = 14;
public static int GetMdtMonthCodeFromSdCardCid(ReadOnlySpan<byte> cid)
{
Abort.DoAbortUnless(cid.Length >= SdCardCidSize);
return cid[SdCardCidMdtMonthCodeIndex] & 0xF;
}
public static int GetMdtYearCodeFromSdCardCid(ReadOnlySpan<byte> cid)
{
Abort.DoAbortUnless(cid.Length >= SdCardCidSize);
return ((cid[SdCardCidMdtYearCodeUpperIndex] & 0xF) << 4) | ((cid[SdCardCidMdtYearCodeLowerIndex] & 0xF0) >> 4);
}
public static int GetPsnFromSdCardCid(ReadOnlySpan<byte> cid)
{
Abort.DoAbortUnless(cid.Length >= SdCardCidSize);
return (cid[SdCardCidPsnIndex + 3] << 24) |
(cid[SdCardCidPsnIndex + 2] << 16) |
(cid[SdCardCidPsnIndex + 1] << 8) |
cid[SdCardCidPsnIndex];
}
public static int GetPrvFromSdCardCid(ReadOnlySpan<byte> cid)
{
Abort.DoAbortUnless(cid.Length >= SdCardCidSize);
return cid[SdCardCidPrvIndex];
}
public static void GetPnmFromSdCardCid(Span<byte> destination, ReadOnlySpan<byte> cid)
{
Abort.DoAbortUnless(cid.Length >= SdCardCidSize);
Abort.DoAbortUnless(destination.Length >= SdCardCidPnmSize);
for (int i = 0; i < SdCardCidPnmSize; i++)
{
destination[SdCardCidPnmSize - i - 1] = cid[SdCardCidPnmIndex + i];
}
}
public static void GetOidFromSdCardCid(Span<byte> destination, ReadOnlySpan<byte> cid)
{
Abort.DoAbortUnless(cid.Length >= SdCardCidSize);
Abort.DoAbortUnless(destination.Length >= SdCardCidOidSize);
for (int i = 0; i < SdCardCidOidSize; i++)
{
destination[SdCardCidOidSize - i - 1] = cid[SdCardCidOidIndex + i];
}
}
public static int GetMidFromSdCardCid(ReadOnlySpan<byte> cid)
{
Abort.DoAbortUnless(cid.Length >= SdCardCidSize);
return cid[SdCardCidMidIndex];
}
}