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Fix bug by resetting stream offset

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This commit is contained in:
de4dot 2011-12-09 23:43:02 +01:00
parent c244f36157
commit 78bb21832e
1 changed files with 7 additions and 3 deletions
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10
de4dot.code/deobfuscators/CryptoObfuscator/ResourceDecrypter.cs
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@ -37,6 +37,7 @@ namespace de4dot.code.deobfuscators.CryptoObfuscator {
public byte[] decrypt(Stream resourceStream) {
byte flags = (byte)resourceStream.ReadByte();
Stream sourceStream = resourceStream;
int sourceStreamOffset = 1;
bool didSomething = false;
if ((flags & 1) != 0) {
@ -60,12 +61,13 @@ namespace de4dot.code.deobfuscators.CryptoObfuscator {
}
}
sourceStream = memStream;
sourceStreamOffset = 0;
didSomething = true;
}
if ((flags & 2) != 0) {
var memStream = new MemoryStream((int)resourceStream.Length);
sourceStream.Position = 0;
sourceStream.Position = sourceStreamOffset;
using (var inflater = new DeflateStream(sourceStream, CompressionMode.Decompress)) {
while (true) {
int count = inflater.Read(buffer1, 0, buffer1.Length);
@ -76,16 +78,18 @@ namespace de4dot.code.deobfuscators.CryptoObfuscator {
}
sourceStream = memStream;
sourceStreamOffset = 0;
didSomething = true;
}
if ((flags & 4) != 0) {
var memStream = new MemoryStream((int)resourceStream.Length);
sourceStream.Position = 0;
for (int i = 0; i < sourceStream.Length; i++)
sourceStream.Position = sourceStreamOffset;
for (int i = sourceStreamOffset; i < sourceStream.Length; i++)
memStream.WriteByte((byte)~sourceStream.ReadByte());
sourceStream = memStream;
sourceStreamOffset = 0;
didSomething = true;
}