Initial import.

T0/CodeElement.cs

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+using System;
+
+abstract class CodeElement {
+
+	internal int Address { get; set; }
+
+	internal int LastLength { get; set; }
+
+	internal abstract int Length { get; }
+
+	internal CodeElement()
+	{
+		Address = -1;
+	}
+
+	internal virtual void SetJumpTarget(CodeElement target)
+	{
+		throw new Exception("Code element accepts no target");
+	}
+
+	internal abstract int Encode(BlobWriter bw);
+
+	internal static int Encode7EUnsigned(uint val, BlobWriter bw)
+	{
+		int len = 1;
+		for (uint w = val; w >= 0x80; w >>= 7) {
+			len ++;
+		}
+		if (bw != null) {
+			for (int k = (len - 1) * 7; k >= 0; k -= 7) {
+				int x = (int)(val >> k) & 0x7F;
+				if (k > 0) {
+					x |= 0x80;
+				}
+				bw.Append((byte)x);
+			}
+		}
+		return len;
+	}
+
+	internal static int Encode7ESigned(int val, BlobWriter bw)
+	{
+		int len = 1;
+		if (val < 0) {
+			for (int w = val; w < -0x40; w >>= 7) {
+				len ++;
+			}
+		} else {
+			for (int w = val; w >= 0x40; w >>= 7) {
+				len ++;
+			}
+		}
+		if (bw != null) {
+			for (int k = (len - 1) * 7; k >= 0; k -= 7) {
+				int x = (int)(val >> k) & 0x7F;
+				if (k > 0) {
+					x |= 0x80;
+				}
+				bw.Append((byte)x);
+			}
+		}
+		return len;
+	}
+}