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Implement decoding CD-i.

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This commit is contained in:
Natalia Portillo
2019-07-31 05:27:22 +01:00
parent 738dcdbdba
commit 7b07c1e243
1 changed files with 51 additions and 2 deletions
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53
DiscImageChef.Filesystems/ISO9660/Dir.cs
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@@ -115,8 +115,57 @@ namespace DiscImageChef.Filesystems.ISO9660
return contents;
}
Dictionary<string, DecodedDirectoryEntry> DecodeCdiDirectory(byte[] data) =>
throw new NotImplementedException();
Dictionary<string, DecodedDirectoryEntry> DecodeCdiDirectory(byte[] data)
{
Dictionary<string, DecodedDirectoryEntry> entries = new Dictionary<string, DecodedDirectoryEntry>();
int entryOff = 0;
while(entryOff + DirectoryRecordSize < data.Length)
{
CdiDirectoryRecord record =
Marshal.ByteArrayToStructureBigEndian<CdiDirectoryRecord>(data, entryOff,
Marshal.SizeOf<CdiDirectoryRecord>());
if(record.length == 0) break;
// Special entries for current and parent directories, skip them
if(record.name_len == 1)
if(data[entryOff + DirectoryRecordSize] == 0 || data[entryOff + DirectoryRecordSize] == 1)
{
entryOff += record.length;
continue;
}
DecodedDirectoryEntry entry = new DecodedDirectoryEntry
{
Extent = record.size == 0 ? 0 : record.start_lbn,
Size = record.size,
Filename = Encoding.GetString(data, entryOff + DirectoryRecordSize, record.name_len),
VolumeSequenceNumber = record.volume_sequence_number,
Timestamp = DecodeHighSierraDateTime(record.date),
XattrLength = record.xattr_len
};
if(record.flags.HasFlag(CdiFileFlags.Hidden))
{
entry.Flags |= FileFlags.Hidden;
continue;
}
entry.CdiSystemArea =
Marshal.ByteArrayToStructureBigEndian<CdiSystemArea>(data,
entryOff + record.name_len +
Marshal.SizeOf<CdiDirectoryRecord>(),
Marshal.SizeOf<CdiSystemArea>());
if(!entry.CdiSystemArea.Value.attributes.HasFlag(CdiAttributes.Directory) || !usePathTable)
entries[entry.Filename] = entry;
entryOff += record.length;
}
return entries;
}
Dictionary<string, DecodedDirectoryEntry> DecodeHighSierraDirectory(byte[] data)
{