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

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WHR 2019-07-23 13:37:11 +08:00
parent fb8a159436
commit eee8cc79e7
3 changed files with 11 additions and 0 deletions
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4
programs/lz4.1
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@ -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)\.
.

3
programs/lz4.1.md
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@ -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%),

4
programs/lz4cli.c
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@ -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) {