64 lines
1.7 KiB
C#
64 lines
1.7 KiB
C#
/*
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Copyright (C) 2011-2015 de4dot@gmail.com
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This file is part of de4dot.
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de4dot 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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de4dot 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 de4dot. If not, see <http://www.gnu.org/licenses/>.
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*/
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using ICSharpCode.SharpZipLib;
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using ICSharpCode.SharpZipLib.Zip.Compression;
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namespace de4dot.code.deobfuscators.Babel_NET {
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class BabelInflater : Inflater {
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int magic;
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public BabelInflater(bool noHeader, int magic)
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: base(noHeader) {
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this.magic = magic;
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}
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protected override bool ReadHeader(ref bool isLastBlock, out int blockType) {
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const int numBits = 4;
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int type = input.PeekBits(numBits);
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if (type < 0) {
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blockType = -1;
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return false;
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}
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input.DropBits(numBits);
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if ((type & 1) != 0)
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isLastBlock = true;
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switch (type >> 1) {
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case 1: blockType = STORED_BLOCK; break;
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case 5: blockType = STATIC_TREES; break;
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case 6: blockType = DYN_TREES; break;
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default: throw new SharpZipBaseException("Unknown block type: " + type);
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}
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return true;
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}
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protected override bool DecodeStoredLength() {
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if ((uncomprLen = input.PeekBits(16)) < 0)
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return false;
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input.DropBits(16);
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uncomprLen ^= magic;
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return true;
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}
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}
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}
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