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[FAT] Fix that first 2 FAT entries are not considered part of the allocation ones, allocating two more.

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This commit is contained in:
Natalia Portillo
2022-12-08 14:15:24 +00:00
parent da68f27b3a
commit a450f0ca32
2 changed files with 13 additions and 11 deletions
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7
Aaru.Filesystems/FAT/Info.cs
View File

@@ -726,7 +726,8 @@ public sealed partial class FAT
{
if(clusters < 4089)
{
ushort[] fat12 = new ushort[clusters];
// The first 2 FAT entries do not count as allocation clusters in FAT12 and FAT16
ushort[] fat12 = new ushort[clusters + 2];
_reservedSectors = fakeBpb.rsectors;
sectorsPerRealSector = fakeBpb.bps / imagePlugin.Info.SectorSize;
@@ -751,14 +752,14 @@ public sealed partial class FAT
bool fat12Valid = fat12[0] >= FAT12_RESERVED && fat12[1] >= FAT12_RESERVED;
if(fat12.Any(entry => entry < FAT12_RESERVED && entry > clusters))
if(fat12.Any(entry => entry < FAT12_RESERVED && entry > clusters + 2))
fat12Valid = false;
ushort[] fat16 = MemoryMarshal.Cast<byte, ushort>(fatBytes).ToArray();
bool fat16Valid = fat16[0] >= FAT16_RESERVED && fat16[1] >= 0x3FF0;
if(fat16.Any(entry => entry < FAT16_RESERVED && entry > clusters))
if(fat16.Any(entry => entry < FAT16_RESERVED && entry > clusters + 2))
fat16Valid = false;
isFat12 = fat12Valid;

17
Aaru.Filesystems/FAT/Super.cs
View File

@@ -315,7 +315,7 @@ public sealed partial class FAT
{
if(clusters < 4089)
{
ushort[] fat12 = new ushort[clusters];
ushort[] fat12 = new ushort[clusters + 1];
_reservedSectors = fakeBpb.rsectors;
sectorsPerRealSector = fakeBpb.bps / imagePlugin.Info.SectorSize;
@@ -782,8 +782,9 @@ public sealed partial class FAT
_bytesPerCluster = _sectorsPerCluster * imagePlugin.Info.SectorSize;
ushort[] firstFatEntries = new ushort[_statfs.Blocks];
ushort[] secondFatEntries = new ushort[_statfs.Blocks];
// The first 2 FAT entries do not count as allocation clusters in FAT12 and FAT16
ushort[] firstFatEntries = new ushort[_statfs.Blocks + 2];
ushort[] secondFatEntries = new ushort[_statfs.Blocks + 2];
bool firstFatValid = true;
bool secondFatValid = true;
@@ -813,7 +814,7 @@ public sealed partial class FAT
if(errno != ErrorNumber.NoError)
return errno;
_fatEntries = new ushort[_statfs.Blocks];
_fatEntries = new ushort[_statfs.Blocks + 2];
pos = 0;
@@ -827,10 +828,10 @@ public sealed partial class FAT
secondFatEntries[pos++] = (ushort)(((fatBytes[i + 1] & 0xF0) >> 4) + (fatBytes[i + 2] << 4));
}
if(firstFatEntries.Any(entry => entry < FAT12_RESERVED && entry > _statfs.Blocks))
if(firstFatEntries.Any(entry => entry < FAT12_RESERVED && entry > _statfs.Blocks + 2))
firstFatValid = false;
if(secondFatEntries.Any(entry => entry < FAT12_RESERVED && entry > _statfs.Blocks))
if(secondFatEntries.Any(entry => entry < FAT12_RESERVED && entry > _statfs.Blocks + 2))
secondFatValid = false;
if(firstFatValid == secondFatValid)
@@ -860,10 +861,10 @@ public sealed partial class FAT
AaruConsole.DebugWriteLine("FAT plugin", Localization.Casting_FAT);
secondFatEntries = MemoryMarshal.Cast<byte, ushort>(fatBytes).ToArray();
if(firstFatEntries.Any(entry => entry < FAT16_RESERVED && entry > _statfs.Blocks))
if(firstFatEntries.Any(entry => entry < FAT16_RESERVED && entry > _statfs.Blocks + 2))
firstFatValid = false;
if(secondFatEntries.Any(entry => entry < FAT16_RESERVED && entry > _statfs.Blocks))
if(secondFatEntries.Any(entry => entry < FAT16_RESERVED && entry > _statfs.Blocks + 2))
secondFatValid = false;
if(firstFatValid == secondFatValid)