Implement CopyTape writing.

DiscImageChef.DiscImages/CopyTape/Write.cs

@@ -0,0 +1,208 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : Write.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Disk image plugins.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Writes CopyTape tape images.
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This library is free software; you can redistribute it and/or modify
+//     it under the terms of the GNU Lesser General Public License as
+//     published by the Free Software Foundation; either version 2.1 of the
+//     License, or (at your option) any later version.
+//
+//     This library is distributed in the hope that it will be useful, but
+//     WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+//     Lesser General Public License for more details.
+//
+//     You should have received a copy of the GNU Lesser General Public
+//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2019 Natalia Portillo
+// ****************************************************************************/
+
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using DiscImageChef.CommonTypes;
+using DiscImageChef.CommonTypes.Enums;
+using DiscImageChef.CommonTypes.Structs;
+using Schemas;
+
+namespace DiscImageChef.DiscImages.CopyTape
+{
+    public partial class CopyTape
+    {
+        FileStream               dataStream;
+        ulong                    lastWrittenBlock;
+        Dictionary<ulong, ulong> writtenBlockPositions;
+
+        public bool Create(string path, MediaType mediaType, Dictionary<string, string> options, ulong sectors,
+                           uint   sectorSize)
+        {
+            if(!SupportedMediaTypes.Contains(mediaType))
+            {
+                ErrorMessage = $"Unsupport media format {mediaType}";
+                return false;
+            }
+
+            imageInfo = new ImageInfo {MediaType = mediaType, SectorSize = sectorSize, Sectors = sectors};
+
+            try { dataStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None); }
+            catch(IOException e)
+            {
+                ErrorMessage = $"Could not create new image file, exception {e.Message}";
+                return false;
+            }
+
+            imageInfo.MediaType = mediaType;
+
+            IsWriting             = true;
+            IsTape                = false;
+            ErrorMessage          = null;
+            lastWrittenBlock      = 0;
+            writtenBlockPositions = new Dictionary<ulong, ulong>();
+            return true;
+        }
+
+        public bool WriteMediaTag(byte[] data, MediaTagType tag)
+        {
+            ErrorMessage = "Unsupported feature";
+            return false;
+        }
+
+        public bool WriteSector(byte[] data, ulong sectorAddress)
+        {
+            if(!writtenBlockPositions.TryGetValue(sectorAddress, out ulong position))
+            {
+                if(dataStream.Length != 0 && lastWrittenBlock >= sectorAddress)
+                {
+                    ErrorMessage = "Cannot write unwritten blocks";
+                    return false;
+                }
+
+                if(lastWrittenBlock + 1 != sectorAddress && sectorAddress != 0 && lastWrittenBlock != 0)
+                {
+                    ErrorMessage = "Cannot skip blocks";
+                    return false;
+                }
+            }
+            else dataStream.Position = (long)position;
+
+            byte[] header = Encoding.ASCII.GetBytes($"CPTP:BLK {data.Length:06D}\n");
+
+            writtenBlockPositions[sectorAddress] = (ulong)dataStream.Position;
+            dataStream.Write(header, 0, header.Length);
+            dataStream.Write(data,   0, data.Length);
+            dataStream.WriteByte(0x0A);
+            if(sectorAddress > lastWrittenBlock) lastWrittenBlock = sectorAddress;
+            dataStream.Seek(0, SeekOrigin.End);
+
+            return true;
+        }
+
+        public bool WriteSectors(byte[] data, ulong sectorAddress, uint length)
+        {
+            for(uint i = 0; i < length; i++)
+            {
+                bool ret = WriteSector(data, sectorAddress + i);
+                if(!ret) return false;
+            }
+
+            return true;
+        }
+
+        public bool WriteSectorLong(byte[] data, ulong sectorAddress)
+        {
+            ErrorMessage = "Unsupported feature";
+            return false;
+        }
+
+        public bool WriteSectorsLong(byte[] data, ulong sectorAddress, uint length)
+        {
+            ErrorMessage = "Unsupported feature";
+            return false;
+        }
+
+        public bool Close()
+        {
+            if(!IsWriting)
+            {
+                ErrorMessage = "Image is not opened for writing";
+                return false;
+            }
+
+            byte[] footer = Encoding.ASCII.GetBytes("CPTP:EOT\n");
+
+            dataStream.Write(footer, 0, footer.Length);
+            dataStream.Flush();
+            dataStream.Close();
+
+            IsWriting = false;
+            return true;
+        }
+
+        public bool SetMetadata(ImageInfo metadata) => true;
+
+        public bool SetGeometry(uint cylinders, uint heads, uint sectorsPerTrack)
+        {
+            ErrorMessage = "Unsupported feature";
+            return false;
+        }
+
+        public bool WriteSectorTag(byte[] data, ulong sectorAddress, SectorTagType tag)
+        {
+            ErrorMessage = "Unsupported feature";
+            return false;
+        }
+
+        public bool WriteSectorsTag(byte[] data, ulong sectorAddress, uint length, SectorTagType tag)
+        {
+            ErrorMessage = "Unsupported feature";
+            return false;
+        }
+
+        public bool SetDumpHardware(List<DumpHardwareType> dumpHardware) => false;
+
+        public bool SetCicmMetadata(CICMMetadataType metadata) => false;
+
+        public bool AddFile(TapeFile file)
+        {
+            if(file.Partition != 0)
+            {
+                ErrorMessage = "Unsupported feature";
+                return false;
+            }
+
+            byte[] marker = Encoding.ASCII.GetBytes("CPTP:MRK\n");
+
+            dataStream.Write(marker, 0, marker.Length);
+
+            return true;
+        }
+
+        public bool AddPartition(TapePartition partition)
+        {
+            if(partition.Number == 0) return true;
+
+            ErrorMessage = "Unsupported feature";
+            return false;
+        }
+
+        public bool SetTape()
+        {
+            IsTape = true;
+            return true;
+        }
+    }
+}