address a few minor Visual warnings

and created target cxx17build

2 files changed, 6 insertions, 3 deletions

diff --git a/lib/lz4.h b/lib/lz4.h
index 962f5e6..737a0c7 100644
--- a/lib/lz4.h
+++ b/lib/lz4.h
@@ -638,9 +638,11 @@ LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") LZ4LIB_API int LZ4
  *  On top of that `LZ4_decompress_fast()` is not protected vs malformed or malicious inputs, making it a security liability.
  *  As a consequence, LZ4_decompress_fast() is strongly discouraged, and deprecated.
  *
- *  Only LZ4_decompress_fast() specificity is that it can decompress a block without knowing its compressed size.
- *  Even that functionality could be achieved in a more secure manner if need be,
- *  though it would require new prototypes, and adaptation of the implementation to this new use case.
+ *  The last remaining LZ4_decompress_fast() specificity is that
+ *  it can decompress a block without knowing its compressed size.
+ *  Such functionality could be achieved in a more secure manner,
+ *  by also providing the maximum size of input buffer,
+ *  but it would require new prototypes, and adaptation of the implementation to this new use case.
  *
  *  Parameters:
  *  originalSize : is the uncompressed size to regenerate.
diff --git a/lib/lz4hc.c b/lib/lz4hc.c
index d5f6743..031df8f 100644
--- a/lib/lz4hc.c
+++ b/lib/lz4hc.c
@@ -1396,6 +1396,7 @@ static int LZ4HC_compress_optimal ( LZ4HC_CCtx_internal* ctx,
              }   }
          }  /* for (cur = 1; cur <= last_match_pos; cur++) */
 
+         assert(last_match_pos < LZ4_OPT_NUM + TRAILING_LITERALS);
          best_mlen = opt[last_match_pos].mlen;
          best_off = opt[last_match_pos].off;
          cur = last_match_pos - best_mlen;