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Implement MS-CAB checksum routine

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This commit is contained in:
Matt Nadareski
2022-12-13 22:11:19 -08:00
parent 645a366dc5
commit 2d51bd8f37
1 changed files with 23 additions and 4 deletions
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27
BurnOutSharp/FileType/MicrosoftCAB.MSCAB.cs
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@@ -1163,10 +1163,29 @@ namespace BurnOutSharp.FileType
/// </summary>
internal static class Checksum
{
// TODO: Implement from `[MS-CAB].pdf`
//public static uint ChecksumData(byte[] data)
//{
public static uint ChecksumData(byte[] data)
{
uint[] C = new uint[4]
{
S(data, 1, data.Length),
S(data, 2, data.Length),
S(data, 3, data.Length),
S(data, 4, data.Length),
};
//}
return C[0] ^ C[1] ^ C[2] ^ C[3];
}
private static uint S(byte[] a, int b, int x)
{
int n = a.Length;
if (x < 4 && b > n % 4)
return 0;
else if (x < 4 && b <= n % 4)
return a[n - b + 1];
else // if (x >= 4)
return a[n - x + b] ^ S(a, b, x - 4);
}
}
}