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Workaround when HFS and Apple Partition Map where created on a

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512 byte/sector device (like a HDD) but are present on a 2048
	byte/sector device (like a CD). Solves #1. HFS+ should not be
	affected (even if wrapped).
This commit is contained in:
Natalia Portillo
2014-08-28 18:26:14 +01:00
parent 2f894c5461
commit 8c358a5084
2 changed files with 176 additions and 59 deletions
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100
DiscImageChef/Plugins/AppleHFS.cs
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@@ -63,14 +63,47 @@ namespace DiscImageChef.Plugins
if ((2 + partitionOffset) >= imagePlugin.GetSectors())
return false;
byte[] mdb_sector = imagePlugin.ReadSector(2 + partitionOffset);
UInt16 drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0);
byte[] mdb_sector;
UInt16 drSigWord;
if (drSigWord == HFS_MAGIC)
if (imagePlugin.GetSectorSize() == 2352 || imagePlugin.GetSectorSize() == 2448 || imagePlugin.GetSectorSize() == 2048)
{
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0x7C); // Seek to embedded HFS+ signature
mdb_sector = imagePlugin.ReadSector(2 + partitionOffset);
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0);
if (drSigWord == HFS_MAGIC)
{
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0x7C); // Seek to embedded HFS+ signature
return drSigWord != HFSP_MAGIC;
}
else
{
mdb_sector = Read2048SectorAs512(imagePlugin, 2 + partitionOffset);
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0);
if (drSigWord == HFS_MAGIC)
{
if(MainClass.isDebug)
Console.WriteLine("DEBUG (HFS Plugin): HFS sector size is 512 bytes, but device's 2048");
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0x7C); // Seek to embedded HFS+ signature
return drSigWord != HFSP_MAGIC;
}
}
}
else
{
mdb_sector = imagePlugin.ReadSector(2 + partitionOffset);
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0);
if (drSigWord == HFS_MAGIC)
{
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0x7C); // Seek to embedded HFS+ signature
return drSigWord != HFSP_MAGIC;
return drSigWord != HFSP_MAGIC;
}
}
return false;
}
@@ -86,8 +119,46 @@ namespace DiscImageChef.Plugins
byte[] pString;
byte[] bb_sector = imagePlugin.ReadSector(partitionOffset); // BB's first sector
byte[] mdb_sector = imagePlugin.ReadSector(2 + partitionOffset); // MDB sector
byte[] bb_sector;
byte[] mdb_sector;
UInt16 drSigWord;
bool APMFromHDDOnCD = false;
if (imagePlugin.GetSectorSize() == 2352 || imagePlugin.GetSectorSize() == 2448 || imagePlugin.GetSectorSize() == 2048)
{
mdb_sector = imagePlugin.ReadSector(2 + partitionOffset);
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0);
if (drSigWord == HFS_MAGIC)
{
bb_sector = imagePlugin.ReadSector(partitionOffset);
}
else
{
mdb_sector = Read2048SectorAs512(imagePlugin, 2 + partitionOffset);
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0);
if (drSigWord == HFS_MAGIC)
{
bb_sector = Read2048SectorAs512(imagePlugin, partitionOffset);
APMFromHDDOnCD = true;
}
else
return;
}
}
else
{
mdb_sector = imagePlugin.ReadSector(2 + partitionOffset);
drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0);
if (drSigWord == HFS_MAGIC)
bb_sector = imagePlugin.ReadSector(partitionOffset);
else
return;
}
MDB.drSigWord = BigEndianBitConverter.ToUInt16(mdb_sector, 0x000);
if (MDB.drSigWord != HFS_MAGIC)
return;
@@ -181,6 +252,8 @@ namespace DiscImageChef.Plugins
sb.AppendLine("Apple Hierarchical File System");
sb.AppendLine();
if (APMFromHDDOnCD)
sb.AppendLine("HFS uses 512 bytes/sector while devices uses 2048 bytes/sector.").AppendLine();
sb.AppendLine("Master Directory Block:");
sb.AppendFormat("Creation date: {0}", DateHandlers.MacToDateTime(MDB.drCrDate)).AppendLine();
sb.AppendFormat("Last modification date: {0}", DateHandlers.MacToDateTime(MDB.drLsMod)).AppendLine();
@@ -291,6 +364,19 @@ namespace DiscImageChef.Plugins
return;
}
byte[] Read2048SectorAs512(ImagePlugins.ImagePlugin imagePlugin, UInt64 LBA)
{
UInt64 LBA2k = LBA / 4;
int Remainder = (int)(LBA % 4);
byte[] buffer = imagePlugin.ReadSector(LBA2k);
byte[] sector = new byte[512];
Array.Copy(buffer, Remainder * 512, sector, 0, 512);
return sector;
}
struct HFS_MasterDirectoryBlock // Should be sector 2 in volume
{
public UInt16 drSigWord;