Migrate some easy LZX stuff

BurnOutSharp.Models/Compression/LZX/Constants.cs

@@ -0,0 +1,46 @@
+namespace BurnOutSharp.Models.Compression.LZX
+{
+    public static class Constants
+    {
+        /* some constants defined by the LZX specification */
+        public const int LZX_MIN_MATCH = (2);
+        public const int LZX_MAX_MATCH = (257);
+        public const int LZX_NUM_CHARS = (256);
+
+        /// <summary>
+        /// also blocktypes 4-7 invalid
+        /// </summary>
+        public const int LZX_BLOCKTYPE_INVALID = (0);
+        public const int LZX_BLOCKTYPE_VERBATIM = (1);
+        public const int LZX_BLOCKTYPE_ALIGNED = (2);
+        public const int LZX_BLOCKTYPE_UNCOMPRESSED = (3);
+        public const int LZX_PRETREE_NUM_ELEMENTS = (20);
+
+        /// <summary>
+        /// aligned offset tree #elements
+        /// </summary>
+        public const int LZX_ALIGNED_NUM_ELEMENTS = (8);
+
+        /// <summary>
+        /// this one missing from spec!
+        /// </summary>
+        public const int LZX_NUM_PRIMARY_LENGTHS = (7);
+
+        /// <summary>
+        /// length tree #elements
+        /// </summary>
+        public const int LZX_NUM_SECONDARY_LENGTHS = (249);
+
+        /* LZX huffman defines: tweak tablebits as desired */
+        public const int LZX_PRETREE_MAXSYMBOLS = (LZX_PRETREE_NUM_ELEMENTS);
+        public const int LZX_PRETREE_TABLEBITS = (6);
+        public const int LZX_MAINTREE_MAXSYMBOLS = (LZX_NUM_CHARS + 50 * 8);
+        public const int LZX_MAINTREE_TABLEBITS = (12);
+        public const int LZX_LENGTH_MAXSYMBOLS = (LZX_NUM_SECONDARY_LENGTHS + 1);
+        public const int LZX_LENGTH_TABLEBITS = (12);
+        public const int LZX_ALIGNED_MAXSYMBOLS = (LZX_ALIGNED_NUM_ELEMENTS);
+        public const int LZX_ALIGNED_TABLEBITS = (7);
+
+        public const int LZX_LENTABLE_SAFETY = (64); /* we allow length table decoding overruns */
+    }
+}