From: Yann Collet <yann.collet.73@gmail.com>
Date: Fri, 1 Aug 2014 18:10:21 +0000 (+0100)
Subject: fix : HC streaming mode
X-Git-Tag: upstream/1.9.3~259^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7ac18ad9dc5a5555f9129659c007fe9141e422b0;p=platform%2Fupstream%2Flz4.git

fix : HC streaming mode
---

diff --git a/NEWS b/NEWS
index 889273f..6ad8906 100644
--- a/NEWS
+++ b/NEWS
@@ -1,5 +1,6 @@
 r121:
 Added : Makefile : install for kFreeBSD and Hurd (Nobuhiro Iwamatsu)
+Fix : Makefile : install for OS-X and BSD, thanks to Takayuki Matsuoka
 
 r120:
 Modified : Streaming API, using strong types
diff --git a/lz4hc.c b/lz4hc.c
index 6086749..7de9811 100644
--- a/lz4hc.c
+++ b/lz4hc.c
@@ -400,7 +400,10 @@ FORCE_INLINE void LZ4HC_Insert (LZ4HC_Data_Structure* hc4, const BYTE* ip)
 char* LZ4_slideInputBufferHC(void* LZ4HC_Data)
 {
     LZ4HC_Data_Structure* hc4 = (LZ4HC_Data_Structure*)LZ4HC_Data;
-    U32 distance = (U32)(hc4->end - hc4->inputBuffer) - 64 KB;
+    size_t distance = (hc4->end - 64 KB) - hc4->inputBuffer;
+
+    if (hc4->end <= hc4->inputBuffer + 64 KB) return (char*)(hc4->end);   /* no update : less than 64KB within buffer */
+
     distance = (distance >> 16) << 16;   /* Must be a multiple of 64 KB */
     LZ4HC_Insert(hc4, hc4->end - MINMATCH);
     memcpy((void*)(hc4->end - 64 KB - distance), (const void*)(hc4->end - 64 KB), 64 KB);