Fixes (#61)

Fix for PX20 decompressor (runtime speed issue) + removed unnecessary variable for RNC

Author: temisu

src/PPDecompressor.cpp

@@ -364,7 +364,7 @@ void PPDecompressor::findKeyRound(BackwardInputStream &inputStream,LSBBitReader<
 count=modeIndex+2;
 distance=readBits(_modeTable[modeIndex])+1;
 }
-if (outputPosition+distance>_rawSize || count>outputPosition)
+if (outputPosition+count+distance>_rawSize || count>outputPosition)
 failed=true;
 if (failed) break;
 outputPosition-=count;

src/RNCDecompressor.cpp

@@ -273,13 +273,9 @@ void RNCDecompressor::RNC1DecompressNew(Buffer &rawData,bool verify)
 {
 uint32_t length{readBits(5)};
 if (!length) return;
-uint32_t maxDepth{0};
 std::array<uint8_t,31> lengthTable;
 for (uint32_t i=0;i<length;i++)
-{
 lengthTable[i]=readBits(4);
-if (lengthTable[i]>maxDepth) maxDepth=lengthTable[i];
-}
 
 dec.createOrderlyHuffmanTable(lengthTable,length);
 };