52 lines
1.7 KiB
C#
52 lines
1.7 KiB
C#
/*
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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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namespace dnSpy.Contracts.Hex.Files.DotNet {
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static class Utils {
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public static int? Read7BitEncodedInt32(HexBuffer buffer, ref HexPosition position) {
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uint val = 0;
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int bits = 0;
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for (int i = 0; i < 5; i++) {
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byte b = buffer.ReadByte(position++);
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val |= (uint)(b & 0x7F) << bits;
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if ((b & 0x80) == 0)
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return (int)val;
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bits += 7;
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}
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return null;
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}
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// #US / #Blob
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public static uint ReadCompressedUInt32(HexBuffer buffer, ref HexPosition position) {
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byte b = buffer.ReadByte(position++);
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if ((b & 0x80) == 0)
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return b;
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if ((b & 0xC0) == 0x80)
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return (uint)((b & 0x3F) << 8) | buffer.ReadByte(position++);
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// The encoding 111x isn't allowed but the CLR sometimes doesn't verify this
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// and just assumes it's 110x. Don't fail if it's 111x, just assume it's 110x.
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return (uint)(((b & 0x1F) << 24) | (buffer.ReadByte(position++) << 16) |
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(buffer.ReadByte(position++) << 8) | buffer.ReadByte(position++));
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}
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}
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}
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