# (C) Copyright 2005- ECMWF.

section_length[3] section4Length ;

unsigned[1] reserved1=0 : hidden;

if (reserved1 == 0) {

flags[1] missingDataFlag 'grib1/1.table';

unsigned[1] numberOfBytesPerInteger ;

unsigned[2] reserved=0 : hidden ;

unsigned[3] numberOfChars ;

unsigned[3] numberOfFloats ;

unsigned[3] numberOfIntegers ;
alias numberOfInts=numberOfIntegers ;

unsigned[3] numberOfLogicals ;

unsigned[3] numberOfReservedBytes ;

unsigned[4] reserved=0 : hidden;
unsigned[4] reserved=0 : hidden;
unsigned[1] reserved=0 : hidden;

ibmfloat floatValues[numberOfFloats];
alias floatVal=floatValues;

if (numberOfBytesPerInteger == 1) { signed[1] integerValues[numberOfIntegers]; }
if (numberOfBytesPerInteger == 2) { signed[2] integerValues[numberOfIntegers]; }
if (numberOfBytesPerInteger == 3) { signed[3] integerValues[numberOfIntegers]; }
if (numberOfBytesPerInteger == 4) { signed[4] integerValues[numberOfIntegers]; }

if (numberOfChars >= 12) {
  ascii[2] marsClass;
  ascii[2] dummy1;
  ascii[2] marsType;
  ascii[2] dummy2;
  ascii[4] experimentVersionNumber;

  alias expver=experimentVersionNumber;
  alias marsExpver=experimentVersionNumber;
    
  constant numberOfRemaininChars  = numberOfChars - 12;

  charValues list(numberOfRemaininChars) {
    ascii[1] char;
  }

  constant zero = 0;
  concept isEps(zero)  { 1 = { marsType = "pf"; } }
  concept isSens(zero) { 1 = { marsType = "sf"; } }

  constant oper = "oper";

  concept marsStream(oper) {
    "enfo" = { marsType = "pf"; }
    "enfo" = { marsType = "cf"; }
    "sens" = { marsType = "sf"; }
  }

  if (isEps) {
    constant perturbationNumber = 0;
    alias mars.number = perturbationNumber;
  }

  if (isSens) {
    constant iterationNumber  = 0;
    constant diagnosticNumber = 0;
    alias mars.iteration  = iterationNumber;
    alias mars.diagnostic = diagnosticNumber;
  }

  # This is commented out because some of the BUDG have the wrong info there
  alias mars.stream = marsStream;
  alias mars.class   = marsClass;
  alias mars.type    = marsType;
  alias mars.expver  = marsExpver;
}
else
{
  charValues list(numberOfChars) {
    ascii[1] char;
  }
}
} else {
  #TODO: decode properly these old data
  section_padding padding;
}
