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Add native format for small FAT32; fix MBR bugs

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This commit is contained in:
Pdawg11239
2025-03-29 20:06:48 -04:00
parent 8505c06e66
commit ac42c67478
6 changed files with 63 additions and 32 deletions
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24
BadBuilder.Formatter/Utilities.cs
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@@ -39,23 +39,27 @@ namespace BadBuilder.Formatter
return (uint)(low | (hi << 16));
}
internal static uint CalculateFATSize(uint totalSectors, uint reservedSectors, uint sectorsPerCluster, uint numberOfFATs, uint bytesPerSector)
internal static uint CalculateFATSize(uint diskSize, uint reservedSectors, uint sectorsPerCluster, uint numberOfFATs, uint bytesPerSector)
{
const ulong fatElementSize = 4;
const ulong reservedClusters = 2;
ulong numerator = fatElementSize * (totalSectors - reservedSectors);
ulong denominator = (sectorsPerCluster * bytesPerSector) + (fatElementSize * numberOfFATs);
ulong numerator = diskSize - reservedSectors + reservedClusters * sectorsPerCluster;
ulong denominator = (sectorsPerCluster * bytesPerSector / fatElementSize) + numberOfFATs;
return (uint)((numerator / denominator) + 1);
return (uint)(numerator / denominator + 1);
}
internal static byte CalculateSectorsPerCluster(ulong diskSizeBytes, uint bytesPerSector) => (diskSizeBytes / (1024 * 1024)) switch
internal static long CalculateSectorsPerCluster(ulong diskSizeBytes, uint bytesPerSector) => diskSizeBytes switch
{
var size when size > 512 => (byte)((4 * 1024) / bytesPerSector),
var size when size > 8192 => (byte)((8 * 1024) / bytesPerSector),
var size when size > 16384 => (byte)((16 * 1024) / bytesPerSector),
var size when size > 32768 => (byte)((32 * 1024) / bytesPerSector),
_ => 1
< 64 * MB => ((512) / bytesPerSector),
< 128 * MB => ((1 * KB) / bytesPerSector),
< 256 * MB => ((2 * KB) / bytesPerSector),
< 8 * GB => ((4 * KB) / bytesPerSector),
< 16 * GB => ((8 * KB) / bytesPerSector),
< 32 * GB => ((16 * KB) / bytesPerSector),
< 2 * TB => ((32 * KB) / bytesPerSector),
_ => ((64 * KB) / bytesPerSector)
};