#!/usr/bin/env php
<?php
    error_reporting(0);

    if ($argc > 3)
    {
        $map = $argv[1];
        $cs = $argv[2];
        $ents = file_get_contents($argv[3] === '-' ? 'php://stdin' : $argv[3]);

        if ($map != '')
        {
            $bits += 1;
        }

        if ($cs != '')
        {
            $bits += 2;
            $cs = intval ($cs);
        }

        if ($ents != '')
        {
            $bits += 4;
            $ents = trim($ents);
            $ents = str_replace ("\r", "", $ents);
        }

        $filebits = pack ('V', $bits);
        print $filebits;

        $out = fopen ("php://output", "wb");

        if ($bits & 1)
        {
            $map = pack ('a64@64', $map);
            fwrite ($out, $map, 64);
        }

        if ($bits & 2)
        {
            $filecs = pack ('V', $cs);
            fwrite ($out, $filecs, 4);
        }

        if ($bits & 4)
        {
            $entsize = pack ('V', strlen($ents));
            fwrite ($out, $entsize, 4);
            print $ents;
        }

        fclose ($out);
	exit;
    }
    else
    {
        print <<<_EOF_
CLI version of r1ch's .override generator.
Only minor changes. All credits goes to r1ch.

Usage:
  You can run this file with php interpreter or make it executable and run
  it directly (unix-like systems [php still required]).

     \$ php -f thisfile -- mapname checksum inputfile
  or \$ ./thisfile mapname checksum inputfile

  All three arguments are required. Any of them can be empty ('').
  For inputfile you can specify a '-' to read data from the standard input.
  Also you can use available php stream wrappers like http://path/file, etc.

  Output file will be written to the standard output.

Examples:
  empty checksum, output saved to file q2dm3.bsp.override:
     \$ ./this maps/q2dm3.bsp '' q2dm3.txt >q2dm3.bsp.override

  empty checksum, input read from standard input, output saved:
     \$ cat q2dm3.txt | ./this maps/q2dm3.bsp '' - >q2dm3.bsp.override

_EOF_;
    }
?>