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Fix file hash for split files with irregular filesize

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Deterous
2024-02-07 09:32:56 +09:00
parent bc3df52e75
commit 8ab6a9d694
4 changed files with 10 additions and 9 deletions
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LibIRD/IRD.cs
+5 -6
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@@ -946,23 +946,22 @@ namespace LibIRD
if (fileClusters[i].Offset < smallestOffset)
smallestOffset = fileClusters[i].Offset;
}
int firstSector = (int)(smallestOffset);
// If already encountered file offset, skip this file
if (Array.Exists(FileKeys, element => element == firstSector))
if (Array.Exists(FileKeys, element => element == smallestOffset))
continue;
if (fileClusters.Length > 1)
Console.WriteLine($"Split file detected: {filePath}");
// Add file offset to keys
FileKeys[FileCount] = firstSector;
FileKeys[FileCount] = smallestOffset;
// Determine whether file is in encrypted or decrypted region
bool encrypted = false;
for (int i = RegionCount - 1; i > 0; i--)
{
if (RegionStart[i] <= firstSector)
if (RegionStart[i] <= smallestOffset)
{
encrypted = i % 2 == 1;
break;
@@ -986,7 +985,7 @@ namespace LibIRD
throw new InvalidFileSystemException("Disc region ended unexpectedly");
// Decrypt sector if necessary
if (encrypted)
buf = DecryptSector(buf, firstSector + j);
buf = DecryptSector(buf, (int)fileClusters[i].Offset + j);
// Hash sector
md5.TransformBlock(buf, 0, numBytes, null, 0);
}
@@ -999,7 +998,7 @@ namespace LibIRD
throw new InvalidFileSystemException("Disc region ended unexpectedly");
// Decrypt partial sector if necessary
if (encrypted)
buf = DecryptSector(buf, firstSector + (int)(fileClusters[i].Count / SectorSize));
buf = DecryptSector(buf, (int)fileClusters[i].Offset + (int)(fileClusters[i].Count / SectorSize));
// Hash partial sector
md5.TransformBlock(buf, 0, (int)(fileClusters[i].Count % SectorSize), null, 0);
}