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Retrieve clusters in FAT16 and FAT32.

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This commit is contained in:
Natalia Portillo
2019-04-26 19:56:58 +01:00
parent 4d28330dcb
commit 35de82ec9f
2 changed files with 63 additions and 0 deletions
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10
DiscImageChef.Filesystems/FAT/Consts.cs
View File

@@ -67,6 +67,16 @@ namespace DiscImageChef.Filesystems.FAT
/// FASTFAT.SYS indicator that basename is lowercase
/// </summary>
const byte FASTFAT_LOWERCASE_BASENAME = 0x08;
const uint FAT32_MASK = 0x0FFFFFFF;
const uint FAT32_END_MASK = 0xFFFFFF8;
const uint FAT32_FORMATTED = 0xFFFFFF6;
const uint FAT32_BAD = 0xFFFFFF7;
const ushort FAT16_END_MASK = 0xFFF8;
const ushort FAT16_FORMATTED = 0xFFF6;
const ushort FAT16_BAD = 0xFFF7;
const ushort FAT12_END_MASK = 0xFF8;
const ushort FAT12_FORMATTED = 0xFF6;
const ushort FAT12_BAD = 0xFF7;
readonly (string hash, string name)[] knownBootHashes =
{

53
DiscImageChef.Filesystems/FAT/File.cs
View File

@@ -31,6 +31,7 @@
// ****************************************************************************/
using System;
using System.Collections.Generic;
using DiscImageChef.CommonTypes.Structs;
namespace DiscImageChef.Filesystems.FAT
@@ -67,5 +68,57 @@ namespace DiscImageChef.Filesystems.FAT
throw new NotImplementedException();
}
uint[] GetClusters(uint startCluster)
{
if(startCluster == 0) return null;
if(startCluster >= XmlFsType.Clusters) return null;
List<uint> clusters = new List<uint>();
uint nextCluster = startCluster;
if(fat12) return null;
ulong nextSector = nextCluster / fatEntriesPerSector + fatFirstSector;
int nextEntry = (int)(nextCluster % fatEntriesPerSector);
ulong currentSector = nextSector;
byte[] fatData = image.ReadSector(currentSector);
if(fat32)
while((nextCluster & FAT32_MASK) > 0 && (nextCluster & FAT32_MASK) <= FAT32_BAD)
{
clusters.Add(nextCluster);
if(currentSector != nextSector)
{
fatData = image.ReadSector(nextSector);
currentSector = nextSector;
}
nextCluster = BitConverter.ToUInt32(fatData, nextEntry * 4);
nextSector = nextCluster / fatEntriesPerSector + fatFirstSector;
nextEntry = (int)(nextCluster % fatEntriesPerSector);
}
else if(fat16)
while(nextCluster > 0 && nextCluster <= FAT16_BAD)
{
clusters.Add(nextCluster);
if(currentSector != nextSector)
{
fatData = image.ReadSector(nextSector);
currentSector = nextSector;
}
nextCluster = BitConverter.ToUInt16(fatData, nextEntry * 2);
nextSector = nextCluster / fatEntriesPerSector + fatFirstSector;
nextEntry = (int)(nextCluster % fatEntriesPerSector);
}
return clusters.ToArray();
}
}
}