コード例 #1
0
        public MetadataPartition(UdfContext context, LogicalVolumeDescriptor volumeDescriptor, MetadataPartitionMap partitionMap)
            : base(context, volumeDescriptor)
        {
            _partitionMap = partitionMap;

            PhysicalPartition physical = context.PhysicalPartitions[partitionMap.PartitionNumber];
            long fileEntryPos          = partitionMap.MetadataFileLocation * (long)volumeDescriptor.LogicalBlockSize;

            byte[] entryData = Utilities.ReadFully(physical.Content, fileEntryPos, _context.PhysicalSectorSize);
            if (!DescriptorTag.IsValid(entryData, 0))
            {
                throw new IOException("Invalid descriptor tag looking for Metadata file entry");
            }

            DescriptorTag dt = Utilities.ToStruct <DescriptorTag>(entryData, 0);

            if (dt.TagIdentifier == TagIdentifier.ExtendedFileEntry)
            {
                ExtendedFileEntry efe = Utilities.ToStruct <ExtendedFileEntry>(entryData, 0);
                _metadataFile = new File(context, physical, efe, _volumeDescriptor.LogicalBlockSize);
            }
            else
            {
                throw new NotImplementedException("Only EFE implemented for Metadata file entry");
            }
        }
コード例 #2
0
        public static File FromDescriptor(UdfContext context, LongAllocationDescriptor icb)
        {
            LogicalPartition partition = context.LogicalPartitions[icb.ExtentLocation.Partition];

            byte[]        rootDirData = UdfUtilities.ReadExtent(context, icb);
            DescriptorTag rootDirTag  = Utilities.ToStruct <DescriptorTag>(rootDirData, 0);

            if (rootDirTag.TagIdentifier == TagIdentifier.ExtendedFileEntry)
            {
                ExtendedFileEntry fileEntry = Utilities.ToStruct <ExtendedFileEntry>(rootDirData, 0);
                if (fileEntry.InformationControlBlock.FileType == FileType.Directory)
                {
                    return(new Directory(context, partition, fileEntry));
                }
                else
                {
                    return(new File(context, partition, fileEntry, (uint)partition.LogicalBlockSize));
                }
            }
            else if (rootDirTag.TagIdentifier == TagIdentifier.FileEntry)
            {
                FileEntry fileEntry = Utilities.ToStruct <FileEntry>(rootDirData, 0);
                if (fileEntry.InformationControlBlock.FileType == FileType.Directory)
                {
                    return(new Directory(context, partition, fileEntry));
                }
                else
                {
                    return(new File(context, partition, fileEntry, (uint)partition.LogicalBlockSize));
                }
            }
            else
            {
                throw new NotImplementedException("Only ExtendedFileEntries implemented");
            }
        }