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Look for SysVfs at start of second cylinder.

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This commit is contained in:
Natalia Portillo
2017-11-08 22:42:29 +00:00
parent 8481f73b2c
commit 8545daf6ba
1 changed files with 25 additions and 4 deletions
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29
DiscImageChef.Filesystems/SysV.cs
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@@ -126,8 +126,15 @@ namespace DiscImageChef.Filesystems
if(partition.End <= (partition.Start + 4 * (ulong)sb_size_in_sectors + sb_size_in_sectors)) // Device must be bigger than SB location + SB size + offset
return false;
// Sectors in a cylinder
int spc = (int)(imagePlugin.ImageInfo.heads * imagePlugin.ImageInfo.sectorsPerTrack);
// Superblock can start on 0x000, 0x200, 0x600 and 0x800, not aligned, so we assume 16 (128 bytes/sector) sectors as a safe value
for(int i = 0; i <= 16; i++)
int[] locations = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
// Superblock can also skip one cylinder (for boot)
spc};
foreach(int i in locations)
{
if(i + sb_size_in_sectors >= (int)imagePlugin.ImageInfo.sectors)
break;
@@ -193,7 +200,7 @@ namespace DiscImageChef.Filesystems
StringBuilder sb = new StringBuilder();
BigEndianBitConverter.IsLittleEndian = true; // Start in little endian until we know what are we handling here
int start;
int start = 0;
uint magic;
string s_fname, s_fpack;
ushort s_nfree, s_ninode;
@@ -212,11 +219,17 @@ namespace DiscImageChef.Filesystems
sb_size_in_sectors = (byte)(0x400 / imagePlugin.GetSectorSize());
else
sb_size_in_sectors = 1; // If not a single sector can store it
// Sectors in a cylinder
int spc = (int)(imagePlugin.ImageInfo.heads * imagePlugin.ImageInfo.sectorsPerTrack);
// Superblock can start on 0x000, 0x200, 0x600 and 0x800, not aligned, so we assume 16 (128 bytes/sector) sectors as a safe value
for(start = 0; start <= 16; start++)
int[] locations = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
// Superblock can also skip one cylinder (for boot)
spc};
foreach(int i in locations)
{
sb_sector = imagePlugin.ReadSectors((ulong)start + partition.Start, sb_size_in_sectors);
sb_sector = imagePlugin.ReadSectors((ulong)i + partition.Start, sb_size_in_sectors);
magic = BigEndianBitConverter.ToUInt32(sb_sector, 0x3F8); // XENIX magic location
if(magic == XENIX_MAGIC || magic == SYSV_MAGIC)
@@ -229,6 +242,7 @@ namespace DiscImageChef.Filesystems
}
else
xenix = true;
start = i;
break;
}
if(magic == XENIX_CIGAM || magic == SYSV_CIGAM)
@@ -241,6 +255,7 @@ namespace DiscImageChef.Filesystems
}
else
xenix = true;
start = i;
break;
}
@@ -250,12 +265,14 @@ namespace DiscImageChef.Filesystems
{
BigEndianBitConverter.IsLittleEndian = true; // Little endian
xenix3 = true;
start = i;
break;
}
if(magic == XENIX_CIGAM)
{
BigEndianBitConverter.IsLittleEndian = false; // Big endian
xenix3 = true;
start = i;
break;
}
@@ -265,12 +282,14 @@ namespace DiscImageChef.Filesystems
{
BigEndianBitConverter.IsLittleEndian = true; // Little endian
sysv = true;
start = i;
break;
}
if(magic == SYSV_CIGAM)
{
BigEndianBitConverter.IsLittleEndian = false; // Big endian
sysv = true;
start = i;
break;
}
@@ -284,6 +303,7 @@ namespace DiscImageChef.Filesystems
{
BigEndianBitConverter.IsLittleEndian = true; // Coherent is in PDP endianness, use helper for that
coherent = true;
start = i;
break;
}
@@ -310,6 +330,7 @@ namespace DiscImageChef.Filesystems
{
sys7th = true;
BigEndianBitConverter.IsLittleEndian = true;
start = i;
break;
}
}