When "getNextBlock" was called after "getNextLine", the pointer could still on the newline.

The pointer to a newline could not advance enough, when the line ended with \r\n. The resulting buffer was correct, as the buffer range went from <start> until \r, but that the pointer increased by just 1 could lead to the problem that the next pointer points at \n, which is still part of the newline and therefore, "getNextBlock" got 1 byte too much.

Refs Issue #4871

include/assimp/IOStreamBuffer.h

@@ -323,7 +323,9 @@ AI_FORCE_INLINE bool IOStreamBuffer<T>::getNextLine(std::vector<T> &buffer) {
         }
     }
     buffer[i] = '\n';
+    while (m_cachePos < m_cacheSize && (m_cache[m_cachePos] == '\r' || m_cache[m_cachePos] == '\n')) {
     ++m_cachePos;
+    }
 
     return true;
 }