mirror of
https://github.com/aaru-dps/Aaru.git
synced 2025-12-16 19:24:25 +00:00
First commit to SVN
git-svn-id: svn://claunia.com/FileSystemIDandChk@1 17725271-3d32-4980-a8cb-9ff532f270ba
This commit is contained in:
263
FileSystemIDandChk/Plugins/FAT.cs
Normal file
263
FileSystemIDandChk/Plugins/FAT.cs
Normal file
@@ -0,0 +1,263 @@
|
||||
using System;
|
||||
using System.IO;
|
||||
using System.Text;
|
||||
using FileSystemIDandChk;
|
||||
|
||||
// Information from Inside Macintosh
|
||||
|
||||
namespace FileSystemIDandChk.Plugins
|
||||
{
|
||||
class FAT : Plugin
|
||||
{
|
||||
public FAT(PluginBase Core)
|
||||
{
|
||||
base.Name = "Microsoft File Allocation Table";
|
||||
base.PluginUUID = new Guid("67591456-90fa-49bd-ac89-14ef750b8af3");
|
||||
}
|
||||
|
||||
public override bool Identify(FileStream stream, long offset)
|
||||
{
|
||||
byte media_descriptor; // Not present on DOS <= 3, present on TOS but != of first FAT entry
|
||||
byte[] fat32_signature = new byte[8]; // "FAT32 "
|
||||
byte[] first_fat_entry_b = new byte[4]; // No matter FAT size we read 2 bytes for checking
|
||||
ulong first_fat_entry;
|
||||
|
||||
stream.Seek(0x15 + offset, SeekOrigin.Begin); // Media Descriptor if present is in 0x15
|
||||
media_descriptor = (byte)stream.ReadByte();
|
||||
stream.Seek(0x52 + offset, SeekOrigin.Begin); // FAT32 signature, if present, is in 0x52
|
||||
stream.Read(fat32_signature, 0, 8);
|
||||
stream.Seek(0x200 + offset, SeekOrigin.Begin); // First FAT entry is always at 0x200 in pre-FAT32
|
||||
stream.Read(first_fat_entry_b, 0, 4);
|
||||
|
||||
first_fat_entry = BitConverter.ToUInt32(first_fat_entry_b, 0); // Easier to manage
|
||||
|
||||
// Let's start the fun
|
||||
if(Encoding.ASCII.GetString(fat32_signature) == "FAT32 ")
|
||||
return true; // Seems easy, check reading
|
||||
|
||||
if((first_fat_entry & 0xFFFFFFF0) == 0xFFFFFFF0) // Seems to be FAT16
|
||||
{
|
||||
if((first_fat_entry & 0xFF) == media_descriptor)
|
||||
return true; // It MUST be FAT16, or... maybe not :S
|
||||
}
|
||||
else if((first_fat_entry & 0x00FFFFF0) == 0x00FFFFF0)
|
||||
{
|
||||
//if((first_fat_entry & 0xFF) == media_descriptor) // Pre DOS<4 does not implement this, TOS does and is !=
|
||||
return true; // It MUST be FAT12, or... maybe not :S
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
public override void GetInformation (FileStream stream, long offset, out string information)
|
||||
{
|
||||
information = "";
|
||||
|
||||
StringBuilder sb = new StringBuilder();
|
||||
|
||||
byte media_descriptor; // Not present on DOS <= 3, present on TOS but != of first FAT entry
|
||||
byte[] fat32_signature = new byte[8]; // "FAT32 "
|
||||
byte[] first_fat_entry_b = new byte[4]; // No matter FAT size we read 2 bytes for checking
|
||||
ulong first_fat_entry;
|
||||
|
||||
stream.Seek(0x15 + offset, SeekOrigin.Begin); // Media Descriptor if present is in 0x15
|
||||
media_descriptor =(byte) stream.ReadByte();
|
||||
stream.Seek(0x52 + offset, SeekOrigin.Begin); // FAT32 signature, if present, is in 0x52
|
||||
stream.Read(fat32_signature, 0, 8);
|
||||
stream.Seek(0x200 + offset, SeekOrigin.Begin); // First FAT entry is always at 0x200 in pre-FAT32
|
||||
stream.Read(first_fat_entry_b, 0, 4);
|
||||
|
||||
first_fat_entry = BitConverter.ToUInt32(first_fat_entry_b, 0); // Easier to manage
|
||||
|
||||
// Let's start the fun
|
||||
if(Encoding.ASCII.GetString(fat32_signature) == "FAT32 ")
|
||||
sb.AppendLine("Microsoft FAT32"); // Seems easy, check reading
|
||||
else if((first_fat_entry & 0xFFFFFFF0) == 0xFFFFFFF0) // Seems to be FAT16
|
||||
{
|
||||
if((first_fat_entry & 0xFF) == media_descriptor)
|
||||
sb.AppendLine("Microsoft FAT16"); // It MUST be FAT16, or... maybe not :S
|
||||
}
|
||||
else if((first_fat_entry & 0x00FFFFF0) == 0x00FFFFF0)
|
||||
{
|
||||
//if((first_fat_entry & 0xFF) == media_descriptor) // Pre DOS<4 does not implement this, TOS does and is !=
|
||||
sb.AppendLine("Microsoft FAT12"); // It MUST be FAT12, or... maybe not :S
|
||||
}
|
||||
else
|
||||
return;
|
||||
|
||||
BIOSParameterBlock BPB = new BIOSParameterBlock();
|
||||
ExtendedParameterBlock EPB = new ExtendedParameterBlock();
|
||||
FAT32ParameterBlock FAT32PB = new FAT32ParameterBlock();
|
||||
|
||||
byte[] eight_bytes = new byte[8];
|
||||
byte[] eleven_bytes = new byte[11];
|
||||
byte[] sixteen_bits = new byte[2];
|
||||
byte[] thirtytwo_bits = new byte[4];
|
||||
|
||||
stream.Seek(3 + offset, SeekOrigin.Begin);
|
||||
stream.Read(eight_bytes, 0, 8);
|
||||
BPB.OEMName = Encoding.ASCII.GetString(eight_bytes);
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
BPB.bps = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
BPB.spc = (byte)stream.ReadByte();
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
BPB.rsectors = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
BPB.fats_no = (byte)stream.ReadByte();
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
BPB.root_ent = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
BPB.sectors = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
BPB.media = (byte)stream.ReadByte();
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
BPB.spfat = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
BPB.sptrk = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
BPB.heads = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
stream.Read(thirtytwo_bits, 0, 4);
|
||||
BPB.hsectors = BitConverter.ToUInt32(thirtytwo_bits, 0);
|
||||
stream.Read(thirtytwo_bits, 0, 4);
|
||||
BPB.big_sectors = BitConverter.ToUInt32(thirtytwo_bits, 0);
|
||||
|
||||
if(Encoding.ASCII.GetString(fat32_signature) == "FAT32 ")
|
||||
{
|
||||
stream.Read(thirtytwo_bits, 0, 4);
|
||||
FAT32PB.spfat = BitConverter.ToUInt32(thirtytwo_bits, 0);
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
FAT32PB.fat_flags = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
FAT32PB.version = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
stream.Read(thirtytwo_bits, 0, 4);
|
||||
FAT32PB.root_cluster = BitConverter.ToUInt32(thirtytwo_bits, 0);
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
FAT32PB.fsinfo_sector = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
stream.Read(sixteen_bits, 0, 2);
|
||||
FAT32PB.backup_sector = BitConverter.ToUInt16(sixteen_bits, 0);
|
||||
FAT32PB.drive_no = (byte)stream.ReadByte();
|
||||
FAT32PB.nt_flags = (byte)stream.ReadByte();
|
||||
FAT32PB.signature = (byte)stream.ReadByte();
|
||||
stream.Read(thirtytwo_bits, 0, 4);
|
||||
FAT32PB.serial_no = BitConverter.ToUInt32(thirtytwo_bits, 0);
|
||||
stream.Read(eleven_bytes, 0, 11);
|
||||
FAT32PB.volume_label = Encoding.ASCII.GetString(eleven_bytes);
|
||||
stream.Read(eight_bytes, 0, 8);
|
||||
FAT32PB.fs_type = Encoding.ASCII.GetString(eight_bytes);
|
||||
}
|
||||
else
|
||||
{
|
||||
EPB.drive_no = (byte)stream.ReadByte();
|
||||
EPB.nt_flags = (byte)stream.ReadByte();
|
||||
EPB.signature = (byte)stream.ReadByte();
|
||||
stream.Read(thirtytwo_bits, 0, 4);
|
||||
EPB.serial_no = BitConverter.ToUInt32(thirtytwo_bits, 0);
|
||||
stream.Read(eleven_bytes, 0, 11);
|
||||
EPB.volume_label = Encoding.ASCII.GetString(eleven_bytes);
|
||||
stream.Read(eight_bytes, 0, 8);
|
||||
EPB.fs_type = Encoding.ASCII.GetString(eight_bytes);
|
||||
}
|
||||
|
||||
sb.AppendFormat("OEM Name: {0}", BPB.OEMName).AppendLine();
|
||||
sb.AppendFormat("{0} bytes per sector.", BPB.bps).AppendLine();
|
||||
sb.AppendFormat("{0} sectors per cluster.", BPB.spc).AppendLine();
|
||||
sb.AppendFormat("{0} sectors reserved between BPB and FAT.", BPB.rsectors).AppendLine();
|
||||
sb.AppendFormat("{0} FATs.", BPB.fats_no).AppendLine();
|
||||
sb.AppendFormat("{0} entires on root directory.", BPB.root_ent).AppendLine();
|
||||
if(BPB.sectors==0)
|
||||
sb.AppendFormat("{0} sectors on volume.", BPB.big_sectors).AppendLine();
|
||||
else
|
||||
sb.AppendFormat("{0} sectors on volume.", BPB.sectors).AppendLine();
|
||||
if((BPB.media & 0xF0) == 0xF0)
|
||||
sb.AppendFormat("Media format: 0x{0:X2}", BPB.media).AppendLine();
|
||||
if(Encoding.ASCII.GetString(fat32_signature) == "FAT32 ")
|
||||
sb.AppendFormat("{0} sectors per FAT.", FAT32PB.spfat).AppendLine();
|
||||
else
|
||||
sb.AppendFormat("{0} sectors per FAT.", BPB.spfat).AppendLine();
|
||||
sb.AppendFormat("{0} sectors per track.", BPB.sptrk).AppendLine();
|
||||
sb.AppendFormat("{0} heads.", BPB.heads).AppendLine();
|
||||
sb.AppendFormat("{0} hidden sectors before BPB.", BPB.hsectors).AppendLine();
|
||||
|
||||
if(Encoding.ASCII.GetString(fat32_signature) == "FAT32 ")
|
||||
{
|
||||
sb.AppendFormat("Cluster of root directory: {0}", FAT32PB.root_cluster).AppendLine();
|
||||
sb.AppendFormat("Sector of FSINFO structure: {0}", FAT32PB.fsinfo_sector).AppendLine();
|
||||
sb.AppendFormat("Sector of backup FAT32 parameter block: {0}", FAT32PB.backup_sector).AppendLine();
|
||||
sb.AppendFormat("Drive number: 0x{0:X2}", FAT32PB.drive_no).AppendLine();
|
||||
sb.AppendFormat("Volume Serial Number: 0x{0:X8}", FAT32PB.serial_no).AppendLine();
|
||||
if((FAT32PB.nt_flags & 0x01) == 0x01)
|
||||
{
|
||||
sb.AppendLine("Volume should be checked on next mount.");
|
||||
if((EPB.nt_flags & 0x02) == 0x02)
|
||||
sb.AppendLine("Disk surface should be checked also.");
|
||||
}
|
||||
|
||||
sb.AppendFormat("Volume label: {0}", EPB.volume_label).AppendLine();
|
||||
sb.AppendFormat("Filesystem type: {0}", EPB.fs_type).AppendLine();
|
||||
}
|
||||
else if(EPB.signature == 0x28 || EPB.signature == 0x29)
|
||||
{
|
||||
sb.AppendFormat("Drive number: 0x{0:X2}", EPB.drive_no).AppendLine();
|
||||
sb.AppendFormat("Volume Serial Number: 0x{0:X8}", EPB.serial_no).AppendLine();
|
||||
if(EPB.signature==0x29)
|
||||
{
|
||||
if((EPB.nt_flags & 0x01) == 0x01)
|
||||
{
|
||||
sb.AppendLine("Volume should be checked on next mount.");
|
||||
if((EPB.nt_flags & 0x02) == 0x02)
|
||||
sb.AppendLine("Disk surface should be checked also.");
|
||||
}
|
||||
|
||||
sb.AppendFormat("Volume label: {0}", EPB.volume_label).AppendLine();
|
||||
sb.AppendFormat("Filesystem type: {0}", EPB.fs_type).AppendLine();
|
||||
}
|
||||
}
|
||||
|
||||
information = sb.ToString();
|
||||
}
|
||||
|
||||
public struct BIOSParameterBlock
|
||||
{
|
||||
public string OEMName; // OEM Name, 8 bytes, space-padded
|
||||
public UInt16 bps; // Bytes per sector
|
||||
public byte spc; // Sectors per cluster
|
||||
public UInt16 rsectors; // Reserved sectors between BPB and FAT
|
||||
public byte fats_no; // Number of FATs
|
||||
public UInt16 root_ent; // Number of entries on root directory
|
||||
public UInt16 sectors; // Sectors in volume
|
||||
public byte media; // Media descriptor
|
||||
public UInt16 spfat; // Sectors per FAT
|
||||
public UInt16 sptrk; // Sectors per track
|
||||
public UInt16 heads; // Heads
|
||||
public UInt32 hsectors; // Hidden sectors before BPB
|
||||
public UInt32 big_sectors; // Sectors in volume if > 65535
|
||||
}
|
||||
|
||||
public struct ExtendedParameterBlock
|
||||
{
|
||||
public byte drive_no; // Drive number
|
||||
public byte nt_flags; // Volume flags if NT (must be 0x29 signature)
|
||||
public byte signature; // EPB signature, 0x28 or 0x29
|
||||
public UInt32 serial_no; // Volume serial number
|
||||
/* Present only if signature == 0x29 */
|
||||
public string volume_label; // Volume label, 11 bytes, space-padded
|
||||
public string fs_type; // Filesystem type, 8 bytes, space-padded
|
||||
}
|
||||
|
||||
public struct FAT32ParameterBlock
|
||||
{
|
||||
public UInt32 spfat; // Sectors per FAT
|
||||
public UInt16 fat_flags; // FAT flags
|
||||
public UInt16 version; // FAT32 version
|
||||
public UInt32 root_cluster; // Cluster of root directory
|
||||
public UInt16 fsinfo_sector; // Sector of FSINFO structure
|
||||
public UInt16 backup_sector; // Secfor of FAT32PB bacup
|
||||
byte[] reserved; // 12 reserved bytes
|
||||
public byte drive_no; // Drive number
|
||||
public byte nt_flags; // Volume flags
|
||||
public byte signature; // FAT32PB signature, should be 0x29
|
||||
public UInt32 serial_no; // Volume serial number
|
||||
public string volume_label; // Volume label, 11 bytes, space-padded
|
||||
public string fs_type; // Filesystem type, 8 bytes, space-padded, must be "FAT32 "
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user