Fix remaining exception-unsafe buffer reallocations

Author: flanglet

src/bitstream/DefaultOutputBitStream.cpp

@@ -175,10 +175,11 @@ void DefaultOutputBitStream::_close()
 
     // Reset fields to force a flush() and trigger an exception
     // on writeBit() or writeBits()
+    kanzi::byte* buffer = new kanzi::byte[8];
+    memset(&buffer[0], 0, size_t(8));
     delete[] _buffer;
+    _buffer = buffer;
     _bufferSize = 8;
-    _buffer = new kanzi::byte[_bufferSize];
-    memset(&_buffer[0], 0, size_t(_bufferSize));
 }
 
 // Write buffer to underlying stream

src/entropy/RangeDecoder.cpp

@@ -127,11 +127,10 @@ int RangeDecoder::decodeHeader(uint frequencies[])
     _cumFreqs[0] = 0;
 
     if (_lenF2S < scale) {
-        if (_f2s != nullptr)
-           delete[] _f2s;
-
+        short* f2s = new short[scale];
+        delete[] _f2s;
+        _f2s = f2s;
         _lenF2S = scale;
-        _f2s = new short[_lenF2S];
     }
 
     // Create histogram of frequencies scaled to 'range' and reverse mapping

src/transform/LZCodec.cpp

@@ -874,9 +874,11 @@ bool LZPCodec::inverse(SliceArray<kanzi::byte>& input, SliceArray<kanzi::byte>&
     kanzi::byte* dst = &output._array[output._index];
 
     if (_hashSize == 0) {
-        _hashSize = 1 << HASH_LOG;
+        const int newSize = 1 << HASH_LOG;
+        int32* hashes = new int32[newSize];
         delete[] _hashes;
-        _hashes = new int32[_hashSize];
+        _hashes = hashes;
+        _hashSize = newSize;
     }
 
     memset(_hashes, 0, sizeof(int32) * _hashSize);