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Implement FAT12 reading.

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This commit is contained in:
Natalia Portillo
2019-04-27 02:26:31 +01:00
parent bdd18cef45
commit ffa5a4ceb7
3 changed files with 26 additions and 5 deletions
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1
DiscImageChef.Filesystems/FAT/FAT.cs
View File

@@ -51,6 +51,7 @@ namespace DiscImageChef.Filesystems.FAT
bool fat12;
bool fat16;
bool fat32;
ushort[] fatEntries;
ulong fatFirstSector;
ulong firstClusterSector;
bool mounted;

12
DiscImageChef.Filesystems/FAT/File.cs
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@@ -166,8 +166,6 @@ namespace DiscImageChef.Filesystems.FAT
uint nextCluster = startCluster;
if(fat12) return null;
ulong nextSector = nextCluster / fatEntriesPerSector + fatFirstSector + (useFirstFat ? 0 : sectorsPerFat);
int nextEntry = (int)(nextCluster % fatEntriesPerSector);
@@ -175,7 +173,7 @@ namespace DiscImageChef.Filesystems.FAT
byte[] fatData = image.ReadSector(currentSector);
if(fat32)
while((nextCluster & FAT32_MASK) > 0 && (nextCluster & FAT32_MASK) <= FAT32_BAD)
while((nextCluster & FAT32_MASK) > 0 && (nextCluster & FAT32_MASK) <= FAT32_FORMATTED)
{
clusters.Add(nextCluster);
@@ -191,7 +189,7 @@ namespace DiscImageChef.Filesystems.FAT
nextEntry = (int)(nextCluster % fatEntriesPerSector);
}
else if(fat16)
while(nextCluster > 0 && nextCluster <= FAT16_BAD)
while(nextCluster > 0 && nextCluster <= FAT16_FORMATTED)
{
clusters.Add(nextCluster);
@@ -206,6 +204,12 @@ namespace DiscImageChef.Filesystems.FAT
(useFirstFat ? 0 : sectorsPerFat);
nextEntry = (int)(nextCluster % fatEntriesPerSector);
}
else
while(nextCluster > 0 && nextCluster <= FAT12_FORMATTED)
{
clusters.Add(nextCluster);
nextCluster = fatEntries[nextCluster];
}
return clusters.ToArray();
}

16
DiscImageChef.Filesystems/FAT/Super.cs
View File

@@ -491,6 +491,21 @@ namespace DiscImageChef.Filesystems.FAT
bytesPerCluster = sectorsPerCluster * imagePlugin.Info.SectorSize;
if(fat12)
{
byte[] fatBytes =
imagePlugin.ReadSectors(fatFirstSector + (useFirstFat ? 0 : sectorsPerFat), sectorsPerFat);
fatEntries = new ushort[statfs.Blocks];
int pos = 0;
for(int i = 0; i + 3 < fatBytes.Length && pos < fatEntries.Length; i += 3)
{
fatEntries[pos++] = (ushort)(((fatBytes[i + 1] & 0xF) << 8) + fatBytes[i + 0]);
fatEntries[pos++] = (ushort)(((fatBytes[i + 1] & 0xF0) >> 4) + (fatBytes[i + 2] << 4));
}
}
// TODO: Check how this affects international filenames
cultureInfo = new CultureInfo("en-US", false);
directoryCache = new Dictionary<string, Dictionary<string, DirectoryEntry>>();
@@ -507,6 +522,7 @@ namespace DiscImageChef.Filesystems.FAT
if(!mounted) return Errno.AccessDenied;
mounted = false;
fatEntries = null;
return Errno.NoError;
}