From 5c7d3812d90aeaf072d14f6b5d935711da6f14c7 Mon Sep 17 00:00:00 2001
From: Yann Collet <cyan@fb.com>
Date: Thu, 26 Apr 2018 15:49:32 -0700
Subject: fasterDecSpeed can be triggered from cli with --favor-decSpeed

---
 lib/lz4frame.c    | 2 +-
 lib/lz4hc.c       | 2 +-
 programs/lz4cli.c | 2 ++
 programs/lz4io.c  | 8 ++++++++
 programs/lz4io.h  | 7 ++++++-
 5 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/lib/lz4frame.c b/lib/lz4frame.c
index 06a0f7b..9d88644 100644
--- a/lib/lz4frame.c
+++ b/lib/lz4frame.c
@@ -613,7 +613,7 @@ size_t LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctxPtr,
         LZ4F_applyCDict(cctxPtr->lz4CtxPtr, cdict, cctxPtr->prefs.compressionLevel);
     }
     if (preferencesPtr->compressionLevel >= LZ4HC_CLEVEL_MIN) {
-          LZ4_favorDecompressionSpeed(cctxPtr->lz4CtxPtr, preferencesPtr->favorDecSpeed);
+          LZ4_favorDecompressionSpeed(cctxPtr->lz4CtxPtr, (int)preferencesPtr->favorDecSpeed);
     }
 
     /* Magic Number */
diff --git a/lib/lz4hc.c b/lib/lz4hc.c
index b90d60b..39ab5fb 100644
--- a/lib/lz4hc.c
+++ b/lib/lz4hc.c
@@ -718,7 +718,7 @@ LZ4_FORCE_INLINE int LZ4HC_compress_generic_internal (
                             cParam.nbSearches, cParam.targetLength, limit,
                             cLevel == LZ4HC_CLEVEL_MAX,   /* ultra mode */
                             dict,
-                            favorDecompressionSpeed);
+                            ctx->favorDecSpeed);
     }
 }
 
diff --git a/programs/lz4cli.c b/programs/lz4cli.c
index 42392eb..ba519b4 100644
--- a/programs/lz4cli.c
+++ b/programs/lz4cli.c
@@ -140,6 +140,7 @@ static int usage_advanced(const char* exeName)
     DISPLAY( "--no-frame-crc : disable stream checksum (default:enabled) \n");
     DISPLAY( "--content-size : compressed frame includes original size (default:not present)\n");
     DISPLAY( "--[no-]sparse  : sparse mode (default:enabled on file, disabled on stdout)\n");
+    DISPLAY( "--favor-decSpeed: compressed files decompress faster, but are less compressed \n");
     DISPLAY( "Benchmark arguments : \n");
     DISPLAY( " -b#    : benchmark file(s), using # compression level (default : 1) \n");
     DISPLAY( " -e#    : test all compression levels from -bX to # (default : 1)\n");
@@ -355,6 +356,7 @@ int main(int argc, const char** argv)
                 if (!strcmp(argument,  "--no-content-size")) { LZ4IO_setContentSize(0); continue; }
                 if (!strcmp(argument,  "--sparse")) { LZ4IO_setSparseFile(2); continue; }
                 if (!strcmp(argument,  "--no-sparse")) { LZ4IO_setSparseFile(0); continue; }
+                if (!strcmp(argument,  "--favor-decSpeed")) { LZ4IO_favorDecSpeed(1); continue; }
                 if (!strcmp(argument,  "--verbose")) { displayLevel++; continue; }
                 if (!strcmp(argument,  "--quiet")) { if (displayLevel) displayLevel--; continue; }
                 if (!strcmp(argument,  "--version")) { DISPLAY(WELCOME_MESSAGE); return 0; }
diff --git a/programs/lz4io.c b/programs/lz4io.c
index ccf4fa1..b52c1f3 100644
--- a/programs/lz4io.c
+++ b/programs/lz4io.c
@@ -116,6 +116,7 @@ static int g_blockIndependence = 1;
 static int g_sparseFileSupport = 1;
 static int g_contentSizeFlag = 0;
 static int g_useDictionary = 0;
+static unsigned g_favorDecSpeed = 0;
 static const char* g_dictionaryFilename = NULL;
 
 
@@ -221,6 +222,12 @@ int LZ4IO_setContentSize(int enable)
     return g_contentSizeFlag;
 }
 
+/* Default setting : 0 (disabled) */
+void LZ4IO_favorDecSpeed(int favor)
+{
+    g_favorDecSpeed = (favor!=0);
+}
+
 static U32 g_removeSrcFile = 0;
 void LZ4IO_setRemoveSrcFile(unsigned flag) { g_removeSrcFile = (flag>0); }
 
@@ -548,6 +555,7 @@ static int LZ4IO_compressFilename_extRess(cRess_t ress, const char* srcFileName,
     prefs.frameInfo.blockSizeID = (LZ4F_blockSizeID_t)g_blockSizeId;
     prefs.frameInfo.blockChecksumFlag = (LZ4F_blockChecksum_t)g_blockChecksum;
     prefs.frameInfo.contentChecksumFlag = (LZ4F_contentChecksum_t)g_streamChecksum;
+    prefs.favorDecSpeed = g_favorDecSpeed;
     if (g_contentSizeFlag) {
       U64 const fileSize = UTIL_getFileSize(srcFileName);
       prefs.frameInfo.contentSize = fileSize;   /* == 0 if input == stdin */
diff --git a/programs/lz4io.h b/programs/lz4io.h
index b21b8b6..22c5e3e 100644
--- a/programs/lz4io.h
+++ b/programs/lz4io.h
@@ -94,10 +94,15 @@ int LZ4IO_setNotificationLevel(int level);
 /* Default setting : 0 (disabled) */
 int LZ4IO_setSparseFile(int enable);
 
-/* Default setting : 0 (disabled) */
+/* Default setting : 0 == no content size present in frame header */
 int LZ4IO_setContentSize(int enable);
 
+/* Default setting : 0 == src file preserved */
 void LZ4IO_setRemoveSrcFile(unsigned flag);
 
+/* Default setting : 0 == favor compression ratio
+ * Note : 1 only works for high compression levels (10+) */
+void LZ4IO_favorDecSpeed(int favor);
+
 
 #endif  /* LZ4IO_H_237902873 */
-- 
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