Pack: added docu.

NEWS

@@ -16,6 +16,7 @@ Version 1.9.9 (29 October 2020):
      * Yearly arithmetic: yearadd, yearsub, yearmul, yeardiv
      * apply: Apply an operator on each input file
      * gh2hl: Interpolate 3D geometric height to height levels
+     * pack: Pack data (NetCDF attribute add_offset/scale_factor)
      * verifygrid: Verify grid coordinates
      * addtrend: Add trend
      * isosurface: Extract isosurface

OPERATORS

@@ -46,6 +46,7 @@ Operator catalog:
    Copy          copy            Copy datasets
    Copy          cat             Concatenate datasets
    Tee           tee             Duplicate a data stream
+   Pack          pack            Pack data
    Replace       replace         Replace variables
    Duplicate     duplicate       Duplicates a dataset
    Mergegrid     mergegrid       Merge grid

doc/tex/Modules

@@ -8,6 +8,7 @@ Filedes       Information
 Apply	      File operations
 Copy	      File operations
 Tee	      File operations
+Pack	      File operations
 Replace	      File operations
 Duplicate     File operations
 Mergegrid     File operations

src/Pack.cc

@@ -123,7 +123,7 @@ Pack(void *process)
       tsID++;
     }
 
-  const int nts = tsID;
+  const auto nts = tsID;
 
   if (CdoDefault::DataType != CDI_UNDEFID)
     {

src/module_list.h

@@ -114,7 +114,7 @@ static const module_t module_Nmldump        = {Nmldump        , {}
 static const module_t module_Output         = {Output         , OutputHelp        , OutputOperators         , EXPOSED  , CDI_BOTH , -1 , 0     , NoRestriction };
 static const module_t module_Outputtab      = {Output         , OutputtabHelp     , OutputtabOperators      , EXPOSED  , CDI_REAL , -1 , 0     , NoRestriction };
 static const module_t module_Outputgmt      = {Outputgmt      , OutputgmtHelp     , OutputgmtOperators      , EXPOSED  , CDI_REAL , 1  , 0     , NoRestriction };
-static const module_t module_Pack           = {Pack           , {}                , PackOperators           , EXPOSED  , CDI_REAL , 1  , 1     , NoRestriction };
+static const module_t module_Pack           = {Pack           , PackHelp          , PackOperators           , EXPOSED  , CDI_REAL , 1  , 1     , NoRestriction };
 static const module_t module_Pardup         = {Pardup         , {}                , PardupOperators         , EXPOSED  , CDI_REAL , 1  , 1     , NoRestriction };
 static const module_t module_Pinfo          = {Pinfo          , {}                , PinfoOperators          , EXPOSED  , CDI_REAL , 1  , 1     , NoRestriction };
 static const module_t module_Pressure       = {Pressure       , {}                , PressureOperators       , EXPOSED  , CDI_REAL , 1  , 1     , NoRestriction };

src/operator_help.h

@@ -291,6 +291,23 @@ static const char *TeeHelp[] = {
     nullptr
 };
 
+static const char *PackHelp[] = {
+    "NAME",
+    "    pack - Pack data",
+    "",
+    "SYNOPSIS",
+    "    pack  infile outfile",
+    "",
+    "DESCRIPTION",
+    "    Packing reduces the data volume by reducing the precision of the stored numbers.",
+    "    It is implemented using the NetCDF attributes add_offset and scale_factor.",
+    "    The operator pack calculates the attributes add_offset and scale_factor for all variables.",
+    "    The default data type for all variables is automatically changed to 16-bit integer.",
+    "    Use the CDO option -b to change the data type to a different integer precision, if needed.",
+    "    Missing values are automatically transformed to the current data type.",
+    nullptr
+};
+
 static const char *ReplaceHelp[] = {
     "NAME",
     "    replace - Replace variables",

src/util_files.cc

@@ -21,15 +21,9 @@
 bool
 fileExists(const char *restrict filename)
 {
-  bool status = false;
   struct stat buf;
-
-  if (stat(filename, &buf) == 0)
-    {
-      if (S_ISREG(buf.st_mode) && buf.st_size > 0) status = true;
-    }
-
-  return status;
+  const auto status = stat(filename, &buf);
+  return (status == 0) && (S_ISREG(buf.st_mode) && buf.st_size > 0);
 }
 
 bool