updated LZ4_DECOMPRESS_INPLACE_MARGIN

to pass worst case scenario.
Now adds margin proportional to input size to counter local expansion.

diff --git a/lib/lz4.h b/lib/lz4.h
index 91dcf64..383c2db 100644 (file)
--- a/lib/lz4.h
+++ b/lib/lz4.h
@@ -518,8 +518,8 @@ LZ4LIB_STATIC_API void LZ4_attach_dictionary(LZ4_stream_t* workingStream, const
  * so there are ways to reduce memory requirements by playing with them.
  */
 
-#define LZ4_DECOMPRESS_INPLACE_MARGIN 32
-#define LZ4_DECOMPRESS_INPLACE_BUFFER_SIZE(decompressedSize)   ( (decompressedSize) + LZ4_DECOMPRESS_INPLACE_MARGIN)  /**< note: presumes that compressedSize < decompressedSize */
+#define LZ4_DECOMPRESS_INPLACE_MARGIN(decompressedSize)  (((decompressedSize) >> 8) + 32)
+#define LZ4_DECOMPRESS_INPLACE_BUFFER_SIZE(decompressedSize)   ( (decompressedSize) + LZ4_DECOMPRESS_INPLACE_MARGIN(decompressedSize))  /**< note: presumes that compressedSize < decompressedSize */
 
 #ifndef LZ4_DISTANCE_MAX   /* history window size; can be user-defined at compile time */
 #  define LZ4_DISTANCE_MAX 65535   /* set to maximum value by default */