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Fix cluster start calculation for FAT32.

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This commit is contained in:
Natalia Portillo
2019-04-28 17:44:47 +01:00
parent 7b3d5d3f11
commit baf6f46eb2
4 changed files with 11 additions and 18 deletions
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10
DiscImageChef.Filesystems/FAT/Dir.cs
View File

@@ -115,16 +115,14 @@ namespace DiscImageChef.Filesystems.FAT
for(int i = 0; i < clusters.Length; i++)
{
byte[] buffer =
image.ReadSectors(firstClusterSector + (ulong)((clusters[i] - (fat32 ? 2 : 0)) * sectorsPerCluster),
sectorsPerCluster);
byte[] buffer = image.ReadSectors(firstClusterSector + clusters[i] * sectorsPerCluster,
sectorsPerCluster);
Array.Copy(buffer, 0, directoryBuffer, i * bytesPerCluster, bytesPerCluster);
}
currentDirectory = new Dictionary<string, CompleteDirectoryEntry>();
byte[] lastLfnName = null;
byte lastLfnChecksum = 0;
List<string> LFNs = new List<string>();
byte[] lastLfnName = null;
byte lastLfnChecksum = 0;
for(int pos = 0; pos < directoryBuffer.Length; pos += Marshal.SizeOf<DirectoryEntry>())
{

8
DiscImageChef.Filesystems/FAT/File.cs
View File

@@ -56,8 +56,7 @@ namespace DiscImageChef.Filesystems.FAT
if(fileBlock >= clusters.Length) return Errno.InvalidArgument;
deviceBlock = (long)(firstClusterSector +
(ulong)((clusters[fileBlock] - (fat32 ? 2 : 0)) * sectorsPerCluster));
deviceBlock = (long)(firstClusterSector + clusters[fileBlock] * sectorsPerCluster);
return Errno.NoError;
}
@@ -103,9 +102,8 @@ namespace DiscImageChef.Filesystems.FAT
{
if(i + firstCluster >= clusters.Length) return Errno.InvalidArgument;
byte[] buffer =
image.ReadSectors(firstClusterSector + (ulong)((clusters[i + firstCluster] - (fat32 ? 2 : 0)) * sectorsPerCluster),
sectorsPerCluster);
byte[] buffer = image.ReadSectors(firstClusterSector + clusters[i + firstCluster] * sectorsPerCluster,
sectorsPerCluster);
ms.Write(buffer, 0, buffer.Length);
}

8
DiscImageChef.Filesystems/FAT/Super.cs
View File

@@ -192,9 +192,8 @@ namespace DiscImageChef.Filesystems.FAT
// First root directory sector
firstClusterSector =
(ulong)((fat32Bpb.root_cluster - 2) * fat32Bpb.spc + fat32Bpb.big_spfat * fat32Bpb.fats_no +
fat32Bpb.rsectors) * sectorsPerRealSector;
sectorsForRootDirectory = 1;
(ulong)(fat32Bpb.big_spfat * fat32Bpb.fats_no + fat32Bpb.rsectors) * sectorsPerRealSector -
2 * sectorsPerCluster;
if(fat32Bpb.fsinfo_sector + partition.Start <= partition.End)
{
@@ -396,8 +395,7 @@ namespace DiscImageChef.Filesystems.FAT
foreach(uint cluster in rootDirectoryClusters)
{
byte[] buffer =
imagePlugin.ReadSectors(firstClusterSector + (cluster - 2) * sectorsPerCluster,
sectorsPerCluster);
imagePlugin.ReadSectors(firstClusterSector + cluster * sectorsPerCluster, sectorsPerCluster);
rootMs.Write(buffer, 0, buffer.Length);
}

3
DiscImageChef.Filesystems/FAT/Xattr.cs
View File

@@ -129,8 +129,7 @@ namespace DiscImageChef.Filesystems.FAT
foreach(uint cluster in rootDirectoryClusters)
{
byte[] buffer = image.ReadSectors(firstClusterSector + (cluster - 2) * sectorsPerCluster,
sectorsPerCluster);
byte[] buffer = image.ReadSectors(firstClusterSector + cluster * sectorsPerCluster, sectorsPerCluster);
eaMs.Write(buffer, 0, buffer.Length);
}