93 lines
2.4 KiB
C#
93 lines
2.4 KiB
C#
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/*
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Copyright (C) 2014-2019 de4dot@gmail.com
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This file is part of dnSpy
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dnSpy is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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dnSpy is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
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*/
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using dnlib.DotNet;
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using dnlib.IO;
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namespace dnSpy.AsmEditor.Hex {
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static class InstructionUtils {
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public static ulong GetTotalMethodBodyLength(MethodDef md) {
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if (md is null || md.RVA == 0)
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return 0;
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var mod = md.Module as ModuleDefMD;//TODO: Support CorModuleDef
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if (mod is null)
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return 0;
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try {
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var reader = mod.Metadata.PEImage.CreateReader();
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reader.Position = (uint)mod.Metadata.PEImage.ToFileOffset(md.RVA);
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var start = reader.Position;
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if (!ReadHeader(ref reader, out ushort flags, out uint codeSize))
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return 0;
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reader.Position += codeSize;
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if ((flags & 8) != 0) {
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reader.Position = (reader.Position + 3) & ~3U;
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byte b = reader.ReadByte();
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if ((b & 0x3F) != 1)
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reader.Position--;
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else if ((b & 0x40) != 0) {
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reader.Position--;
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uint num = (ushort)((reader.ReadUInt32() >> 8) / 24);
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reader.Position += num * 24;
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}
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else {
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uint num = (ushort)((uint)reader.ReadByte() / 12);
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reader.Position += 2 + num * 12;
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}
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}
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return reader.Position - start;
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}
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catch {
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return 0;
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}
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}
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static bool ReadHeader(ref DataReader reader, out ushort flags, out uint codeSize) {
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byte b = reader.ReadByte();
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switch (b & 7) {
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case 2:
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case 6:
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flags = 2;
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codeSize = (uint)(b >> 2);
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return true;
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case 3:
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flags = (ushort)((reader.ReadByte() << 8) | b);
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uint headerSize = (byte)(flags >> 12);
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ushort maxStack = reader.ReadUInt16();
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codeSize = reader.ReadUInt32();
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uint localVarSigTok = reader.ReadUInt32();
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reader.Position = reader.Position - 12 + headerSize * 4;
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if (headerSize < 3)
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flags &= 0xFFF7;
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return true;
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default:
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flags = 0;
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codeSize = 0;
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return false;
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}
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}
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}
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}
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