/* * Copyright (c) 2016 Thomas Pornin * * 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; } }