lz4cli: add option '--best' as an alias of '-12'

diff --git a/programs/lz4.1 b/programs/lz4.1
index 3ca017a..d758ed5 100644 (file)
--- a/programs/lz4.1
+++ b/programs/lz4.1
@@ -120,6 +120,10 @@ Compression level, with # being any value from 1 to 12\. Higher values trade com
 Switch to ultra\-fast compression levels\. The higher the value, the faster the compression speed, at the cost of some compression ratio\. If \fB=#\fR is not present, it defaults to \fB1\fR\. This setting overrides compression level if one was set previously\. Similarly, if a compression level is set after \fB\-\-fast\fR, it overrides it\.
 .
 .TP
+\fB\-\-best\fR
+Set highest compression level\. Same as -12\.
+.
+.TP
 \fB\-\-favor\-decSpeed\fR
 Generate compressed data optimized for decompression speed\. Compressed data will be larger as a consequence (typically by ~0\.5%), while decompression speed will be improved by 5\-20%, depending on use cases\. This option only works in combination with very high compression levels (>=10)\.
 .

diff --git a/programs/lz4.1.md b/programs/lz4.1.md
index 8874467..56c0053 100644 (file)
--- a/programs/lz4.1.md
+++ b/programs/lz4.1.md
@@ -135,6 +135,9 @@ only the latest one will be applied.
   This setting overrides compression level if one was set previously.
   Similarly, if a compression level is set after `--fast`, it overrides it.
 
+* `--best`:
+  Set highest compression level. Same as -12.
+
 * `--favor-decSpeed`:
   Generate compressed data optimized for decompression speed.
   Compressed data will be larger as a consequence (typically by ~0.5%),

diff --git a/programs/lz4cli.c b/programs/lz4cli.c
index 3b5d61e..5da7654 100644 (file)
--- a/programs/lz4cli.c
+++ b/programs/lz4cli.c
@@ -146,6 +146,7 @@ static int usage_advanced(const char* exeName)
     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( "--fast[=#]: switch to ultra fast compression level (default: %i)\n", 1);
+    DISPLAY( "--best  : same as -%d\n", LZ4HC_CLEVEL_MAX);
     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");
@@ -414,6 +415,9 @@ int main(int argc, const char** argv)
                         }
                         continue;
                     }
+
+                /* For gzip(1) compatibility */
+                if (!strcmp(argument,  "--best")) { cLevel=LZ4HC_CLEVEL_MAX; continue; }
             }
 
             while (argument[1]!=0) {