Remove .NET Framework 4.6.2/4.7.2 (#24)

* Remove < .NET 4.8, general cleanup * Abstract * Tango * Banner * Scan no more * Common * Application * Access * Filter-feeder * Graffiti * Paint-over * Law and Order * XOR-o * Unused staircase * Maybe * Maybe not * Delete this * The word is "no" * Emit * Improper * Aye aye * Fence * Barrier * Monkey * Pail * Lines
2025-12-16 19:14:27 +00:00 · 2020-07-15 09:41:59 -07:00
parent 1a718a3915
commit 4e406604c2
82 changed files with 8975 additions and 11172 deletions
--- a/SabreTools.Library/FileTypes/CHDFileV4.cs
+++ b/SabreTools.Library/FileTypes/CHDFileV4.cs
@@ -0,0 +1,95 @@
+using System;
+using System.IO;
+using System.Text;
+
+using SabreTools.Library.Tools;
+
+namespace SabreTools.Library.FileTypes
+{
+    /// <summary>
+    /// CHD V4 File
+    /// </summary>
+    public class CHDFileV4 : 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,
+            CHDCOMPRESSION_ZLIB_PLUS = 2,
+            CHDCOMPRESSION_AV = 3,
+        }
+
+        /// <summary>
+        /// Map format
+        /// </summary>
+        public class Map
+        {
+            public ulong offset;       // starting offset within the file
+            public uint crc32;         // 32-bit CRC of the uncompressed data
+            public ushort length_lo;   // lower 16 bits of length
+            public byte length_hi;     // upper 8 bits of length
+            public byte flags;         // flags, indicating compression info
+        }
+
+        public const int HeaderSize = 108;
+        public const uint Version = 4;
+
+        // V4-specific header values
+        public Flags flags;                        // flags (see above)
+        public Compression compression;            // compression type
+        public uint totalhunks;                    // total # of hunks represented
+        public ulong logicalbytes;                 // logical size of the data (in bytes)
+        public ulong metaoffset;                   // offset to the first blob of metadata
+        public uint hunkbytes;                     // number of bytes per hunk
+        public byte[] sha1 = new byte[20];         // combined raw+meta SHA1
+        public byte[] parentsha1 = new byte[20];   // combined raw+meta SHA1 of parent
+        public byte[] rawsha1 = new byte[20];      // raw data SHA1
+
+        /// <summary>
+        /// Parse and validate the header as if it's V4
+        /// </summary>
+        public static CHDFileV4 Deserialize(Stream stream)
+        {
+            CHDFileV4 chd = new CHDFileV4();
+
+            using (BinaryReader br = new BinaryReader(stream, Encoding.Default, true))
+            {
+                chd.tag = br.ReadCharsBigEndian(8);
+                chd.length = br.ReadUInt32BigEndian();
+                chd.version = br.ReadUInt32BigEndian();
+                chd.flags = (Flags)br.ReadUInt32BigEndian();
+                chd.compression = (Compression)br.ReadUInt32BigEndian();
+                chd.totalhunks = br.ReadUInt32BigEndian();
+                chd.logicalbytes = br.ReadUInt64BigEndian();
+                chd.metaoffset = br.ReadUInt64BigEndian();
+                chd.hunkbytes = br.ReadUInt32BigEndian();
+                chd.sha1 = br.ReadBytesBigEndian(20);
+                chd.parentsha1 = br.ReadBytesBigEndian(20);
+                chd.rawsha1 = br.ReadBytesBigEndian(20);
+            }
+
+            return chd;
+        }
+
+        /// <summary>
+        /// Return internal SHA1 hash
+        /// </summary>
+        public override byte[] GetHash()
+        {
+            return sha1;
+        }
+    }
+}