//==========================================================================
//
//      cksum.c
//
//      RedBoot POSIX CRC calculation/command
//
//==========================================================================
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// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under    
// the terms of the GNU General Public License as published by the Free     
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    
// for more details.                                                        
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//
// As a special exception, if other files instantiate templates or use      
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//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas
// Contributors: gthomas
// Date:         2001-01-31
// Purpose:      
// Description:  
//              
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================

#include <redboot.h>

// Compute a CRC, using the POSIX 1003 definition

RedBoot_cmd("cksum", 
            "Compute a 32bit checksum [POSIX algorithm] for a range of memory", 
            "-b <location> -l <length>",
            do_cksum
    );

void
do_cksum(int argc, char *argv[])
{
    struct option_info opts[2];
    unsigned long base, len, crc;
    bool base_set, len_set;

    init_opts(&opts[0], 'b', true, OPTION_ARG_TYPE_NUM, 
              (void *)&base, (bool *)&base_set, "base address");
    init_opts(&opts[1], 'l', true, OPTION_ARG_TYPE_NUM, 
              (void *)&len, (bool *)&len_set, "length");
    if (!scan_opts(argc, argv, 1, opts, 2, 0, 0, "")) {
        return;
    }
    if (!base_set || !len_set) {
	if (load_address >= (CYG_ADDRESS)ram_start &&
	    load_address_end < (CYG_ADDRESS)ram_end &&
	    load_address < load_address_end) {
	    base = load_address;
	    len = load_address_end - load_address;
            diag_printf("Computing cksum for area %lx-%lx\n",
                        base, load_address_end);
	} else {
	    diag_printf("usage: cksum -b <addr> -l <length>\n");
	    return;
	}
    }
    crc = cyg_posix_crc32((unsigned char *)base, len);
    diag_printf("POSIX cksum = %lu %lu (0x%08lx 0x%08lx)\n", crc, len, crc, len);
}