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#!/bin/bash

# restart using a Tcl shell \

    exec sh -c 'for tclshell in tclsh tclsh83 cygtclsh80 ; do \

            ( echo | $tclshell ) 2> /dev/null && exec $tclshell "`( cygpath -w \"$0\" ) 2> /dev/null || echo $0`" "$@" ; \

        done ; \

        echo "flash_cksum.tcl: cannot find Tcl shell" ; exit 1' "$0" "$@"

#===============================================================================

#

#    flash_cksum.tcl

#

#    Compute the checksum for a AEB-1 flash module

#

#===============================================================================

#####ECOSGPLCOPYRIGHTBEGIN####

## -------------------------------------------

## This file is part of eCos, the Embedded Configurable Operating System.

## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, 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

## Software Foundation; either version 2 or (at your option) any later version.

##

## eCos is distributed in the hope that it will be useful, but WITHOUT ANY

## WARRANTY; without even the implied warranty of MERCHANTABILITY or

## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

## for more details.

##

## You should have received a copy of the GNU General Public License along

## with eCos; if not, write to the Free Software Foundation, Inc.,

## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

##

## As a special exception, if other files instantiate templates or use macros

## or inline functions from this file, or you compile this file and link it

## with other works to produce a work based on this file, this file does not

## by itself cause the resulting work to be covered by the GNU General Public

## License. However the source code for this file must still be made available

## in accordance with section (3) of the GNU General Public License.

##

## This exception does not invalidate any other reasons why a work based on

## this file might be covered by the GNU General Public License.

##

## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

## at http://sources.redhat.com/ecos/ecos-license/

## -------------------------------------------

#####ECOSGPLCOPYRIGHTEND####

#===============================================================================

######DESCRIPTIONBEGIN####

#

# Author(s):    gthomas

# Contact(s):   gthomas

# Date:         1999/01/06

# Version:      0.01 $RcsVersion$

# Purpose:      Compute the checksum for a FLASH ROM module.

# Description:

# Requires:     A working Tcl interpreter, V8.0 or later.

# Provides:     Command line operation only.

# Inputs:       

# Side FX:      

# Outputs:

# See also:     'Notes' which describes the process of creating the GDB stubs

#               module.

# Known bugs:   

# Usage:

#

#####DESCRIPTIONEND####

#===============================================================================

#

# This ckecksum is the 32-bit XOR of all 32 bit words in the file.

# The output of the program is a single number, suitable for use in

# a Makefile/script used to create an AEB-1 module for FLASH ROM.

#

proc checksum { name } {

    set status [ catch {

        set fd [open $name "r"]

    fconfigure $fd -translation binary

        set data [read $fd]

        close $fd

    } message]

    if { $status != 0 } {

        puts "Unable to read file $name: $message"

        exit 1

    }

    set sum 0

    set length [string length $data]

    for { set i 0 } { $i < $length } { incr i 4 } {

        # Fetch the next 32 bit word.  The funky tests are to handle the case

        # of zero bytes.

        set char0 [string index $data [expr $i + 0]]

        if { "$char0" != "" } {

            scan $char0 "%c" ascii0

        } else {

            set ascii0 0

        }

        set char1 [string index $data [expr $i + 1]]

        if { "$char1" != "" } {

            scan $char1 "%c" ascii1

        } else {

            set ascii1 0

        }

        set char2 [string index $data [expr $i + 2]]

        if { "$char2" != "" } {

            scan $char2 "%c" ascii2

        } else {

            set ascii2 0

        }

        set char3 [string index $data [expr $i + 3]]

        if { "$char3" != "" } {

            scan $char3 "%c" ascii3

        } else {

            set ascii3 0

        }

        set word [expr $ascii0 << 24]

        set word [expr $word | [expr $ascii1 << 16]]

        set word [expr $word | [expr $ascii2 << 8]]

        set word [expr $word | $ascii3]

        set sum [expr $sum ^ $word]

        # puts "sum: [format %8.8X $sum], word: [format %8.8X $word]"

    }

    return $sum

}

proc bswap { native } {

    set byte0 [expr [expr $native >> 24] & 255]

    set byte1 [expr [expr $native >> 16] & 255]

    set byte2 [expr [expr $native >> 8] & 255]

    set byte3 [expr [expr $native >> 0] & 255]

    set swapped [expr $byte3 << 24]

    set swapped [expr $swapped | [expr $byte2 << 16]]

    set swapped [expr $swapped | [expr $byte1 << 8]]

    set swapped [expr $swapped | [expr $byte0 << 0]]

    # puts "native: [format %8.8X $native], swapped: [format %8.8X $swapped]"

    return $swapped

}

global tcl_platform

set byteOrder $tcl_platform(byteOrder)

# puts "platform byte order = $byteOrder"

# Parse command line arguments

set argc 0

array set args { }

foreach arg $argv {

    set args([incr argc]) $arg

}

if { "$argc" != "1" } {

        puts "usage: flash_cksum <file>"

        exit 1

}

set cksum [checksum $args(1)]

# if { "$byteOrder" == "littleEndian" } {

    # puts "Swap bytes!"

    set cksum [bswap $cksum]

# }

# Tcl up to at least version 8.3 has problems on alphas,

# Tcl_FormatObjCmd() invokes Tcl_GetIntFromObj() which

# ends up doing dodgy conversions between int and long.

# This results in an error if bit 32 is set. Rewriting

# the format string to output one byte at a time is

# safer.

# puts "[format 0x%8.8X $cksum]"

puts [format "0x%02X%02X%02X%02X"       \

        [expr (($cksum >> 24) & 0x0FF)] \

        [expr (($cksum >> 16) & 0x0FF)] \

        [expr (($cksum >>  8) & 0x0FF)] \

        [expr (($cksum      ) & 0x0FF)]]