# crc32bugs.test - Copyright (C) 2002 Pat Thoyts <patthoyts@users.sf.net>
#
# Bug finding for crc32 module.
# In particular we are looking for byte order problems, and issues between
# the trf code and tcl-only code.
#
# -------------------------------------------------------------------------
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# -------------------------------------------------------------------------
# RCS: @(#) $Id: crc32bugs.test,v 1.8 2006/10/09 21:41:40 andreas_kupries Exp $

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

source [file join \
	[file dirname [file dirname [file join [pwd] [info script]]]] \
	devtools testutilities.tcl]

testsNeedTcl     8.2
testsNeedTcltest 1.0

catch {namespace delete ::crc}
support {
    useLocal crc16.tcl crc16
}
testing {
    useLocal crc32.tcl crc32
}

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

puts "> $::tcl_platform(byteOrder)"

if {[::crc::LoadAccelerator critcl]} {
    puts "> bugs, critcl based"
}
if {[::crc::LoadAccelerator trf]} {
    puts "> bugs, Trf based"
}
puts "> bugs, pure Tcl"

# -------------------------------------------------------------------------
# Handle multiple implementation testing
#

array set preserve [array get ::crc::accel]

proc implementations {} {
    variable ::crc::accel
    foreach {a v} [array get accel] {if {$v} {lappend r $a}}
    lappend r tcl; set r
}

proc select_implementation {impl} {
    variable ::crc::accel
    foreach e [array names accel] { set accel($e) 0 }
    if {[string compare "tcl" $impl] != 0} {
        set accel($impl) 1
    }
}

proc reset_implementation {} {
    variable ::crc::accel
    array set accel [array get ::preserve]
}

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

set tests {
    1  ""                 "0"
    2  "\x00"             "d202ef8d"
    3  "\x00\x00"         "41d912ff"
    4  "\x00\x00\x00"     "ff41d912"
    5  "\x00\x00\x00\x00" "2144df1c"
    6  "\xFF"             "ff000000"
    7  "\xFF\xFF"         "ffff0000"
    8  "\xFF\xFF\xFF"     "ffffff00"
    9  "\xFF\xFF\xFF\xFF" "ffffffff"
   10  "\x00\x00\x00\x01" "5643ef8a"
   11  "\x80\x00\x00\x00" "cc1d6927"
}

foreach impl [implementations] {
    select_implementation $impl
    foreach {n msg expected} $tests {
        test crc32bugs-$impl-1.$n "crc32 (crc32 and crc16 comparison)" {
            set r [catch {
                list [::crc::crc32 -format %x $msg] \
                    [::crc::crc-32 -format %x $msg]
            } err]
            if {$r} {lappend err $::errorInfo}
            list $r $err
        } [list 0 [list $expected $expected]]
    }
}

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

testsuiteCleanup

# Local Variables:
#  mode: tcl
#  indent-tabs-mode: nil
# End: