Extract out FileTypes namespace

SabreTools.FileTypes/CHD/CHDFileV2.cs

@@ -0,0 +1,94 @@
+using System;
+using System.IO;
+using System.Text;
+
+using SabreTools.IO;
+
+namespace SabreTools.FileTypes.CHD
+{
+    /// <summary>
+    /// CHD V2 File
+    /// </summary>
+    internal class CHDFileV2 : CHDFile
+    {
+        /// <summary>
+        /// CHD flags
+        /// </summary>
+        [Flags]
+        public enum Flags : uint
+        {
+            DriveHasParent = 0x00000001,
+            DriveAllowsWrites = 0x00000002,
+        }
+
+        /// <summary>
+        /// Compression being used in CHD
+        /// </summary>
+        public enum Compression : uint
+        {
+            CHDCOMPRESSION_NONE = 0,
+            CHDCOMPRESSION_ZLIB = 1,
+        }
+
+        /// <summary>
+        /// Map format
+        /// </summary>
+        public class Map
+        {
+            public ulong offset;   // 44; starting offset within the file
+            public ulong length;   // 20; length of data; if == hunksize, data is uncompressed
+        }
+
+        public const int HeaderSize = 80;
+        public const uint Version = 2;
+
+        // V2-specific header values
+        public Flags flags;                        // flags (see above)
+        public Compression compression;            // compression type
+        public uint hunksize;                      // 512-byte sectors per hunk
+        public uint totalhunks;                    // total # of hunks represented
+        public uint cylinders;                     // number of cylinders on hard disk
+        public uint heads;                         // number of heads on hard disk
+        public uint sectors;                       // number of sectors on hard disk
+        public byte[] md5 = new byte[16];          // MD5 checksum of raw data
+        public byte[] parentmd5 = new byte[16];    // MD5 checksum of parent file
+        public uint seclen;                        // number of bytes per sector
+
+        /// <summary>
+        /// Parse and validate the header as if it's V2
+        /// </summary>
+        public static CHDFileV2 Deserialize(Stream stream)
+        {
+            CHDFileV2 chd = new CHDFileV2();
+
+            using (BinaryReader br = new BinaryReader(stream, Encoding.Default, true))
+            {
+                chd.tag = br.ReadChars(8);
+                chd.length = br.ReadUInt32BigEndian();
+                chd.version = br.ReadUInt32BigEndian();
+                chd.flags = (Flags)br.ReadUInt32BigEndian();
+                chd.compression = (Compression)br.ReadUInt32BigEndian();
+                chd.hunksize = br.ReadUInt32BigEndian();
+                chd.totalhunks = br.ReadUInt32BigEndian();
+                chd.cylinders = br.ReadUInt32BigEndian();
+                chd.heads = br.ReadUInt32BigEndian();
+                chd.sectors = br.ReadUInt32BigEndian();
+                chd.md5 = br.ReadBytes(16);
+                chd.parentmd5 = br.ReadBytes(16);
+                chd.seclen = br.ReadUInt32BigEndian();
+
+                chd.MD5 = chd.md5;
+            }
+
+            return chd;
+        }
+
+        /// <summary>
+        /// Return internal MD5 hash
+        /// </summary>
+        public override byte[] GetHash()
+        {
+            return md5;
+        }
+    }
+}