diff --git a/lzs/LZS.cpp b/lzs/LZS.cpp
index 81d8efc..cfc5228 100644
--- a/lzs/LZS.cpp
+++ b/lzs/LZS.cpp
@@ -32,76 +32,6 @@ qint32 LZS::dad[4097];
 unsigned char LZS::text_buf[4113];
 QByteArray LZS::result;
 
-const QByteArray &LZS::decompress(const QByteArray &data, int max, LZSObserver *observer)
-{
-	return decompress(data.constData(), data.size(), max, observer);
-}
-
-const QByteArray &LZS::decompress(const char *data, int fileSize, int max, LZSObserver *observer)
-{
-	int curResult = 0, sizeAlloc = max + 10;
-	quint16 curBuff = 4078, offset, flagByte = 0, i, length;
-	const quint8 *fileData = (const quint8 *)data,
-	        *endFileData = fileData + fileSize;
-
-	if (observer) {
-		observer->setMaximum(fileSize);
-	}
-
-	// Impossible case
-	if(quint64(sizeAlloc) > 2000 * quint64(fileSize)) {
-		qWarning() << "LZS::decompress impossible ratio case" << sizeAlloc << 2000 * quint64(fileSize);
-		result.clear();
-		return result;
-	}
-
-	// Reduce the amount of realloc
-	if (result.size() < sizeAlloc) {
-		try {
-			result.resize(sizeAlloc);
-		} catch(std::bad_alloc) {
-			result.clear();
-			return result;
-		}
-	}
-
-	memset(text_buf, 0, 4078); // The buffer of 4096 bytes is set to 0
-
-	forever {
-		if (((flagByte >>= 1) & 256) == 0) {
-			flagByte = *fileData++ | 0xff00; // First byte
-		}
-
-		if (observer) { // Output
-			observer->setValue(fileData - (const quint8 *)data);
-		}
-
-		if (fileData >= endFileData || curResult >= max) {
-			result.truncate(curResult);
-			return result; // Ending
-		}
-
-		if (flagByte & 1) {
-			// Uncompressed byte
-			result[curResult] = text_buf[curBuff] = *fileData++;
-			curBuff = (curBuff + 1) & 4095;
-			++curResult;
-		} else {
-			// Infos to retrieve uncompressed data
-			offset = *fileData++;
-			length = *fileData++;
-			offset |= (length & 0xF0) << 4;
-			length = (length & 0xF) + 2 + offset;
-
-			for (i = offset; i <= length; ++i) {
-				result[curResult] = text_buf[curBuff] = text_buf[i & 4095];
-				curBuff = (curBuff + 1) & 4095;
-				++curResult;
-			}
-		}
-	}
-}
-
 const QByteArray &LZS::decompressAll(const QByteArray &data, LZSObserver *observer)
 {
 	return decompressAll(data.constData(), data.size(), observer);
@@ -109,7 +39,7 @@ const QByteArray &LZS::decompressAll(const QByteArray &data, LZSObserver *observ
 
 const QByteArray &LZS::decompressAll(const char *data, int fileSize, LZSObserver *observer)
 {
-	int curResult = 0, sizeAlloc = fileSize * 5;
+	int curResult = 0, sizeAlloc = int(qMin(quint64(fileSize * 5), quint64(INT_MAX)));
 	quint16 curBuff = 4078, offset, flagByte = 0, i, length;
 	const quint8 *fileData = (const quint8 *)data,
 	        *endFileData = fileData + fileSize;
@@ -118,19 +48,12 @@ const QByteArray &LZS::decompressAll(const char *data, int fileSize, LZSObserver
 		observer->setMaximum(fileSize);
 	}
 
-	// Impossible case
-	if(sizeAlloc > 2000 * fileSize) {
-		result.clear();
-		return result;
-	}
-
 	// Reduce the amount of realloc
 	if (result.size() < sizeAlloc) {
 		try {
 			result.resize(sizeAlloc);
 		} catch(std::bad_alloc) {
-			result.clear();
-			return result;
+			// Ignore, try anyway
 		}
 	}
 
diff --git a/lzs/LZS.h b/lzs/LZS.h
index 079d084..8ad00d7 100644
--- a/lzs/LZS.h
+++ b/lzs/LZS.h
@@ -31,12 +31,10 @@
 class LZS
 {
 public:
-	static const QByteArray &decompress(const QByteArray &fileData, int max, LZSObserver *observer = NULL);
-	static const QByteArray &decompress(const char *data, int fileSize, int max, LZSObserver *observer = NULL);
-	static const QByteArray &decompressAll(const QByteArray &fileData, LZSObserver *observer = NULL);
-	static const QByteArray &decompressAll(const char *data, int fileSize, LZSObserver *observer = NULL);
-	static const QByteArray &compress(const QByteArray &fileData, LZSObserver *observer = NULL);
-	static const QByteArray &compress(const char *data, int sizeData, LZSObserver *observer = NULL);
+	static const QByteArray &decompressAll(const QByteArray &fileData, LZSObserver *observer = nullptr);
+	static const QByteArray &decompressAll(const char *data, int fileSize, LZSObserver *observer = nullptr);
+	static const QByteArray &compress(const QByteArray &fileData, LZSObserver *observer = nullptr);
+	static const QByteArray &compress(const char *data, int sizeData, LZSObserver *observer = nullptr);
 
 private:
 	static void InsertNode(qint32 r);
diff --git a/lzs/LZSObserver.cpp b/lzs/LZSObserver.cpp
index 3e830b5..1a2183e 100644
--- a/lzs/LZSObserver.cpp
+++ b/lzs/LZSObserver.cpp
@@ -17,27 +17,15 @@
 #include "LZSObserver.h"
 #include <stdio.h>
 
-LZSObserver::LZSObserver()
-{
-}
-
-LZSObserverPercent::LZSObserverPercent()
-{
-}
-
 void LZSObserverPercent::setValue(int value)
 {
-	int percent = value * 100.0 / (double)maximum();
+	int percent = int(qint64(value * 100) / maximum());
 	if (percent != _lastPercent) {
 		_lastPercent = percent;
 		setPercent(percent);
 	}
 }
 
-LZSObserverStdOut::LZSObserverStdOut()
-{
-}
-
 void LZSObserverStdOut::setPercent(int percent)
 {
 	printf("[%d%%] %s\r", percent, qPrintable(_filename));
diff --git a/lzs/LZSObserver.h b/lzs/LZSObserver.h
index 7690e77..7397ca4 100644
--- a/lzs/LZSObserver.h
+++ b/lzs/LZSObserver.h
@@ -22,7 +22,8 @@
 class LZSObserver
 {
 public:
-	LZSObserver();
+	inline LZSObserver() {}
+	inline virtual ~LZSObserver() {}
 
 	inline void setMaximum(int maximum) {
 		_maximum = maximum;
@@ -32,7 +33,7 @@ class LZSObserver
 		return _maximum;
 	}
 
-	virtual void setValue(int value)=0;
+	virtual void setValue(int value) = 0;
 private:
 	int _maximum;
 };
@@ -40,9 +41,10 @@ class LZSObserver
 class LZSObserverPercent : public LZSObserver
 {
 public:
-	LZSObserverPercent();
-	void setValue(int value);
-	virtual void setPercent(int percent)=0;
+	inline LZSObserverPercent() {}
+	inline virtual ~LZSObserverPercent() override {}
+	virtual void setValue(int value) override;
+	virtual void setPercent(int percent) = 0;
 private:
 	int _lastPercent;
 };
@@ -50,11 +52,12 @@ class LZSObserverPercent : public LZSObserver
 class LZSObserverStdOut : public LZSObserverPercent
 {
 public:
-	LZSObserverStdOut();
+	inline LZSObserverStdOut() {}
+	inline virtual ~LZSObserverStdOut() override {}
 	inline void setFilename(const QString &filename) {
 		_filename = filename;
 	}
-	virtual void setPercent(int percent);
+	virtual void setPercent(int percent) override;
 private:
 	QString _filename;
 };
diff --git a/main.cpp b/main.cpp
index 2562b81..e85137b 100644
--- a/main.cpp
+++ b/main.cpp
@@ -26,12 +26,12 @@ int main(int argc, char *argv[])
 #endif
 
 	Arguments args;
-	quint32 lzsSize;
+	qint32 lzsSize = 0;
 	LZSObserver *observer;
 	LZSObserverStdOut stdObserver;
 
 	if (args.quiet()) {
-		observer = NULL;
+		observer = nullptr;
 	} else {
 		observer = &stdObserver;
 	}