# ico.tcl -- -*- tcl-indent-level: 4; -*-
#
# Win32 ico manipulation code
#
# Copyright (c) 2003-2007 Aaron Faupell
# Copyright (c) 2003-2011 ActiveState
#
# RCS: @(#) $Id: ico.tcl,v 1.32 2011/10/05 00:10:46 hobbs Exp $
#
# 09/12/2020 - DRL - Corrected ::ico::getIconMembersICO to support 256x256 icons.

# Sample usage:
#	set file bin/wish.exe
#	set icos [::ico::icons $file]
#	set img  [::ico::getIcon $file [lindex $icos 1] -format image -res 32]

package require Tcl 8.4
# Instantiate vars we need for this package
namespace eval ::ico {
    namespace export icons iconMembers getIcon getIconByName writeIcon copyIcon transparentColor clearCache EXEtoICO
    # stores cached indices of icons found
    variable  RES
    array set RES {}

    # used for 4bpp number conversion
    variable BITS
    array set BITS [list {} 0 0000 0 0001 1 0010 2 0011 3 0100 4 \
			0101 5 0110 6 0111 7 1000 8 1001 9 \
			1010 10 1011 11 1100 12 1101 13 1110 14 1111 15 \
			\
			00000 00 00001 0F 00010 17 00011 1F \
			00100 27 00101 2F 00110 37 00111 3F \
			01000 47 01001 4F 01010 57 01011 5F \
			01100 67 01101 6F 01110 77 01111 7F \
			10000 87 10001 8F 10010 97 10011 9F \
			10100 A7 10101 AF 10110 B7 10111 BF \
			11000 C7 11001 CF 11010 D7 11011 DF \
			11100 E7 11101 EF 11110 F7 11111 FF]
}


# icons --
#
# List of icons in a file
#
# ARGS:
#	file	File to extract icon info from.
#	?-type?	Type of file.  If not specified, it is derived from
#		the file extension.  Currently recognized types are
#		EXE, DLL, ICO, ICL, BMP, and ICODATA
#
# RETURNS:
#	list of icon names or numerical IDs
#
proc ::ico::icons {file args} {
    parseOpts type $args
    if {![file exists $file]} {
        return -code error "couldn't open \"$file\": no such file or directory"
    }
    gettype type $file
    if {![llength [info commands getIconList$type]]} {
	return -code error "unsupported file format $type"
    }
    getIconList$type [file normalize $file]
}

# iconMembers --
#
# Get info on images which make up an icon
#
# ARGS:
#	file		File containing icon
#       name		Name of the icon in the file
#	?-type?		Type of file.  If not specified, it is derived from
#			the file extension.  Currently recognized types are
#			EXE, DLL, ICO, ICL, BMP, and ICODATA
#
# RETURNS:
#	list of icons as tuples {name width height bpp}
#
proc ::ico::iconMembers {file name args} {
    parseOpts type $args
    if {![file exists $file]} {
        return -code error "couldn't open \"$file\": no such file or directory"
    } 
    gettype type $file
    if {![llength [info commands getIconMembers$type]]} {
	return -code error "unsupported file format $type"
    }
    getIconMembers$type [file normalize $file] $name
}

# getIcon --
#
# Get pixel data or image of icon
#
# ARGS:
#	file		File to extract icon info from.
#	name		Name of image in the file to use.  The name is the first element
#			in the sublists returned by iconMembers.
#	?-res?		Set the preferred resolution.
#	?-bpp?		Set the preferred color depth in bits per pixel.
#	?-exact?	Accept only exact matches for res and bpp. Returns
#			an error if there is no exact match.
#	?-type?		Type of file.  If not specified, it is derived from
#			the file extension.  Currently recognized types are
#			EXE, DLL, ICO, ICL, BMP, and ICODATA
#	?-format?	Output format. Must be one of "image" or "colors"
#			'image' will return the name of a Tk image.
#			'colors' will return a list of pixel values
#	?-image?	If output is image, use this as the name of Tk image
#			created
#
# RETURNS:
#	pixel data as a list that could be passed to 'image create'
#	or the name of a Tk image
#
proc ::ico::getIcon {file name args} {
    set image {}
    set format image
    set exact 0
    set bpp 24
    parseOpts {type format image res bpp exact} $args
    if {![file exists $file]} {
        return -code error "couldn't open \"$file\": no such file or directory"
    }
    gettype type $file
    if {![llength [info commands getRawIconData$type]]} {
        return -code error "unsupported file format $type"
    }
    # ICODATA is a pure data type - not a real file
    if {$type ne "ICODATA"} {
	set file [file normalize $file]
    }

    set mem [getIconMembers$type $file $name]

    if {![info exists res]} {
        set icon [lindex $mem 0 0]
    } elseif {$exact} {
        set icon [lindex [lsearch -inline -glob $mem "* $res $bpp"] 0]
        if {$icon == ""} { return -code error "No matching icon" }
    } else {
        set mem [lsort -integer -index 1 $mem]
        set match ""
        foreach x $mem {
            if {[lindex $x 1] == [lindex $res 0]} { lappend match $x }
        }
        if {$match == ""} {
            # todo: resize a larger icon
            #return -code error "No matching icon"
            set match [list [lindex $mem end]]
        }
        set match [lsort -integer -decreasing -index 3 $match]
        foreach x $match {
            if {[lindex $x 3] <= $bpp} { set icon [lindex $x 0]; break }
        }
        if {![info exists icon]} { set icon [lindex $match end 0]}
    }
    if {$format eq "name"} {
        return $icon
    }
    set colors [eval [linsert [getRawIconData$type $file $icon] 0 getIconAsColorList]]
    if {$format eq "image"} {
        return [createImage $colors $image]
    }
    return $colors
}

# getIconByName --
#
# Get pixel data or image of icon name in file. The icon name
# is the first element of the sublist from [iconMembers].
#
# ARGS:
#	file		File to extract icon info from.
#	name		Name of image in the file to use.  The name is the first element
#			in the sublists returned by iconMembers.
#	?-type?		Type of file.  If not specified, it is derived from
#			the file extension.  Currently recognized types are
#			EXE, DLL, ICO, ICL, BMP, and ICODATA
#	?-format?	Output format. Must be one of "image" or "colors"
#			'image' will return the name of a Tk image.
#			'colors' will return a list of pixel values
#	?-image?	If output is image, use this as the name of Tk image
#			created
#
# RETURNS:
#	pixel data as a list that could be passed to 'image create'
#
proc ::ico::getIconByName {file name args} {
    set format image
    set image {}
    parseOpts {type format image} $args
    if {![file exists $file]} {
        return -code error "couldn't open \"$file\": no such file or directory"
    }
    gettype type $file
    if {![llength [info commands getRawIconData$type]]} {
        return -code error "unsupported file format $type"
    }
    # ICODATA is a pure data type - not a real file
    if {$type ne "ICODATA"} {
        set file [file normalize $file]
    }
    set colors [eval [linsert [getRawIconData$type $file $name] 0 getIconAsColorList]]
    if {$format eq "image"} {
        return [createImage $colors $image]
    }
    return $colors
}

# getFileIcon --
#
# Get the registered icon for the file under Windows
#
# ARGS:
#	file	File to get icon for.
#	
#	optional arguments and return values are the same as getIcon
#
proc ::ico::getFileIcon {file args} {
    set icon "%SystemRoot%\\System32\\shell32.dll,0"
    if {[file isdirectory $file] || $file == "Folder"} {
        if {![catch {registry get HKEY_CLASSES_ROOT\\Folder\\DefaultIcon ""} reg]} {
            set icon $reg
        }
    } else {
        set ext [file extension $file]
        if {![catch {registry get HKEY_CLASSES_ROOT\\$ext ""} doctype]} {
            if {![catch {registry get HKEY_CLASSES_ROOT\\$doctype\\CLSID ""} clsid] && \
                ![catch {registry get HKEY_CLASSES_ROOT\\CLSID\\$clsid\\DefaultIcon ""} reg]} {
                set icon $reg
            } elseif {![catch {registry get HKEY_CLASSES_ROOT\\$doctype\\DefaultIcon ""} reg]} {
                set icon $reg
            }
        }
    }
    set index [lindex [split $icon ,] 1]
    set icon [lindex [split $icon ,] 0]
    if {$index == ""} { set index 0 }
    set icon [string trim $icon "@'\" "]
    while {[regexp -nocase {%([a-z]+)%} $icon -> var]} {
        set icon [string map [list %$var% $::env($var)] $icon]
    }
    set icon [string map [list %1 $file] $icon]
    if {$index < 0} {
        if {![catch {eval [list getIcon $icon [string trimleft $index -]] $args} output]} {
            return $output
        }
        set index 0
    }
    return [eval [list getIcon $icon [lindex [icons $icon] $index]] $args]
}

# writeIcon --
#
# Overwrite write image in file with depth/pixel data
#
# ARGS:
#	file	File to extract icon info from.
#	name	Name of image in the file to use. The name is the first element
#		in the sublists returned by iconMembers.
#	bpp	bit depth of icon we are writing
#	data	Either pixel color data (as returned by getIcon -format color)
#		or the name of a Tk image.
#	?-type?	Type of file.  If not specified, it is derived from
#		the file extension.  Currently recognized types are
#		EXE, DLL, ICO and ICL
#
# RETURNS:
#	nothing
#
proc ::ico::writeIcon {file name bpp data args} {
    parseOpts type $args
    # Bug 3007168 (code is able to create a file if none is present)
    #if {![file exists $file]} {
    #    return -code error "couldn't open \"$file\": no such file or directory"
    #}
    gettype type $file
    if {![llength [info commands writeIcon$type]]} {
	return -code error "unsupported file format $type"
    }
    if {[llength $data] == 1} {
        set data [getColorListFromImage $data]
    } elseif {[lsearch -glob [join $data] #*] > -1} {
        set data [translateColors $data]
    }
    if {$bpp != 1 && $bpp != 4 && $bpp != 8 && $bpp != 24 && $bpp != 32} {
	return -code error "invalid color depth"
    }
    set palette {}
    if {$bpp <= 8} {
	# set palette [getPaletteFromColors $data]
	lassign [getPaletteFromColors $data] paletteEntries palette data
	if {$paletteEntries > (1 << $bpp)} {
	    return -code error "specified color depth too low"
	}
	puts "Found $paletteEntries colors bpp is $bpp"
	# set data  [lindex $palette 2]
	# set palette [lindex $palette 1]
	append palette [string repeat \000 \
			    [expr {(1 << ($bpp + 2)) - [string length $palette]}]]
    }
    set and [getAndMaskFromColors $data]
    set xor [getXORFromColors $bpp $data]
    # writeIcon$type file index w h bpp palette xor and
    writeIcon$type [file normalize $file] $name \
	[llength [lindex $data 0]] [llength $data] $bpp $palette $xor $and
}


# copyIcon --
#
# Copies an icon directly from one file to another
#
# ARGS:
#	file1	        File to extract icon info from.
#	name1		Name of image in the file to use.  The name is the first element
#			in the sublists returned by iconMembers.
#	file2	        File to write icon to.
#	name2		Name of image in the file to use.  The name is the first element
#			in the sublists returned by iconMembers.
#	?-fromtype?	Type of source file.  If not specified, it is derived from
#		        the file extension.  Currently recognized types are
#		        EXE, DLL, ICO, ICL, BMP, and ICODATA
#	?-totype?	Type of destination file.  If not specified, it is derived from
#		        the file extension.  Currently recognized types are
#		        EXE, DLL, ICO, ICL, BMP, and ICODATA
#
# RETURNS:
#	nothing
#
proc ::ico::copyIcon {file1 name1 file2 name2 args} {
    parseOpts {fromtype totype} $args
    if {![file exists $file1]} {
        return -code error "couldn't open \"$file1\": no such file or directory"
    }
    gettype fromtype $file1
    gettype totype $file2
    if {![llength [info commands writeIcon$totype]]} {
	return -code error "unsupported file format $totype"
    }
    if {![llength [info commands getRawIconData$fromtype]]} {
	return -code error "unsupported file format $fromtype"
    }
    # src is a list: {w h bpp palette xor and}
    set src [getRawIconData$fromtype $file1 $name1]
    writeIcon $file2 $name2 [lindex $src 2] [getIconAsColorList {*}$src] -type $totype
}

#
# transparentColor --
#
# Turns on transparency for all pixels in the image that match the color
#
# ARGS:
#	img	        Name of the Tk image to modify, or an image in color list format
#	color	        Color in #hex format which will be made transparent
#
# RETURNS:
#	the data or image after modification
#
proc ::ico::transparentColor {img color} {
    if {[llength $img] == 1} {
        package require Tk
        if {[string match "#*" $color]} {
            set color [scan $color "#%2x%2x%2x"]
        }
        set w [image width $img]
        set h [image height $img]
        for {set y 0} {$y < $h} {incr y} {
            for {set x 0} {$x < $w} {incr x} {
                if {[$img get $x $y] eq $color} {$img transparency set $x $y 1}
            }
        }
    } else {
        set y 0
        foreach row $img {
            set x 0
            foreach px $row {
                if {$px == $color} {lset img $y $x {}}
                incr x
            }
            incr y
        }
    }
    return $img
}

#
# clearCache --
#
# Clears the cache of icon offsets
#
# ARGS:
#	file	optional filename
#
#
# RETURNS:
#	nothing
#
proc ::ico::clearCache {{file {}}} {
    variable RES
    if {$file ne ""} {
	array unset RES $file,*
    } else {
	unset RES
	array set RES {}
    }
}

#
# EXEtoICO --
#
# Convert all icons found in exefile into regular icon files
#
# ARGS:
#	exeFile	        Input EXE filename
#	?icoDir?	Output ICO directory. Default is the
#			same directory exeFile is located in
#
# RETURNS:
#	nothing
#
proc ::ico::EXEtoICO {exeFile {icoDir {}}} {
    variable RES

    if {![file exists $exeFile]} {
        return -code error "couldn't open \"$exeFile\": no such file or directory"
    } 

    set file [file normalize $exeFile]
    FindResources $file

    if {$icoDir == ""} { set icoDir [file dirname $file] }

    set fh [open $file]
    fconfigure $fh -eofchar {} -encoding binary -translation lf

    foreach group $RES($file,group,names) {
        set dir  {}
        set data {}
        foreach icon $RES($file,group,$group,members) {
            seek $fh $RES($file,icon,$icon,offset) start
	    set ico $RES($file,icon,$icon,data)
	    eval [list lappend dir] $ico
	    append data [read $fh [eval calcSize $ico 40]]
        }

        # write them out to a file
        set ifh [open [file join $icoDir [file tail $exeFile]-$group.ico] w+]
        fconfigure $ifh -eofchar {} -encoding binary -translation lf

        bputs $ifh sss 0 1 [llength $RES($file,group,$group,members)]
        set offset [expr {6 + ([llength $RES($file,group,$group,members)] * 16)}]
        foreach {w h bpp} $dir {
            set len [calcSize $w $h $bpp 40]
            lappend fix $offset $len
            bputs $ifh ccccssii $w $h [expr {$bpp <= 8 ? 1 << $bpp : 0}] 0 1 $bpp $len $offset
            set offset [expr {$offset + $len}]
        }
        puts -nonewline $ifh $data
        foreach {offset size} $fix {
            seek $ifh [expr {$offset + 20}] start
            bputs $ifh i $size
        }
        close $ifh
    }
    close $fh
}



##
## Internal helper commands.
## Some may be appropriate for exposing later, but would need docs
## and make sure they "fit" in the API.
##

# gets the file extension as we use it internally (upper case, no '.')
proc ::ico::gettype {var file} {
    upvar $var type
    if {[info exists type]} { return }
    set type [string trimleft [string toupper [file extension $file]] .]
    if {$type == ""} {
	return -code error "could not determine file type from extension, use -$var option"
    }
}

# helper proc to parse optional arguments to some of the public procs
proc ::ico::parseOpts {acc opts} {
    foreach {key val} $opts {
        set key [string trimleft $key -]
	if {[lsearch -exact $acc $key] >= 0} {
	    upvar $key $key
	    set $key $val
	} elseif {$key ne ""} {
	    return -code error "unknown option \"$key\": must be one of $acc"
	}
    }
}

# formats a single color from a binary decimal list format to the #hex format
proc ::ico::formatColor {r g b} {
    format "#%02X%02X%02X" [scan $r %c] [scan $g %c] [scan $b %c]
}

# translates a color list from the #hex format to the decimal list format
#                                #0000FF                  {0 0 255}
proc ::ico::translateColors {colors} {
    set new {}
    foreach line $colors {
	set tline {}
	foreach x $line {
	    if {$x eq ""} {lappend tline {}; continue}
	    lappend tline [scan $x "#%2x%2x%2x"]
	}
	set new [linsert $new 0 $tline]
    }
    return $new
}

# reads a 32 bit signed integer from the filehandle
proc ::ico::getdword {fh} {
    binary scan [read $fh 4] i* tmp
    return $tmp
}

proc ::ico::getword {fh} {
    binary scan [read $fh 2] s* tmp
    return $tmp
}

proc ::ico::getulong {fh} {
    binary scan [read $fh 4] i tmp
    return [format %u $tmp]
}

proc ::ico::getushort {fh} {
    binary scan [read $fh 2] s tmp
    return [expr {$tmp & 0x0000FFFF}]
}

proc ::ico::bputs {fh format args} {
    puts -nonewline $fh [eval [list binary format $format] $args]
}

proc ::ico::createImage {colors {name {}}} {
    package require Tk
    set h [llength $colors]
    set w [llength [lindex $colors 0]]
    if {$name ne ""} {
	set img [image create photo $name -width $w -height $h]
    } else {
	set img [image create photo -width $w -height $h]
    }
    if {0} {
	# if image supported "" colors as transparent pixels,
	# we could use this much faster op
	$img put -to 0 0 $colors
    } else {
	for {set x 0} {$x < $w} {incr x} {
	    for {set y 0} {$y < $h} {incr y} {
                set clr [lindex $colors $y $x]
                if {$clr ne ""} {
                    $img put -to $x $y $clr
                }
            }
        }
    }
    return $img
}

# return a list of colors in the #hex format from raw icon data
# returned by readDIB
proc ::ico::getIconAsColorList {w h bpp palette xor and} {
    # Create initial empty color array that we'll set indices in
    set colors {}
    set row    {}
    set empty  {}
    for {set x 0} {$x < $w} {incr x} { lappend row $empty }
    for {set y 0} {$y < $h} {incr y} { lappend colors $row }
    set x 0
    set y [expr {$h-1}]
    if {$bpp == 1} {
	binary scan $xor B* xorBits
	foreach i [split $xorBits {}] a [split $and {}] {
	    if {$x == $w} { set x 0; incr y -1 }
	    if {$a == 0} {
                lset colors $y $x [lindex $palette $i]
	    }
	    incr x
	}
    } elseif {$bpp == 4} {
	variable BITS
	binary scan $xor B* xorBits
	set i 0
	foreach a [split $and {}] {
	    if {$x == $w} { set x 0; incr y -1 }
	    if {$a == 0} {
                set bits [string range $xorBits $i [expr {$i+3}]]
                lset colors $y $x [lindex $palette $BITS($bits)]
            }
            incr i 4
            incr x
	}
    } elseif {$bpp == 8} {
	set lnPal [llength $palette]
	foreach i [split $xor {}] a [split $and {}] {
	    if {$x == $w} { set x 0; incr y -1 }
	    if {$a == 0} {
		if {[set idx [scan $i %c]] < $lnPal} {
		    lset colors $y $x [lindex $palette [scan $i %c]]
		} else {
		    puts "Index to $idx, but palette length $lnPal"
		}
	    }
	    incr x
	}
    } elseif {$bpp == 16} {
        variable BITS
        binary scan $xor b* xorBits
        set i 0
	foreach a [split $and {}] {
	    if {$x == $w} { set x 0; incr y -1 }
	    if {$a == 0} {
                set b1 [string range $xorBits      $i        [expr {$i+4}]]
                set b2 [string range $xorBits [expr {$i+5}]  [expr {$i+9}]]
                set b3 [string range $xorBits [expr {$i+10}] [expr {$i+14}]]
                lset colors $y $x "#$BITS($b3)$BITS($b2)$BITS($b1)"
            }
            incr i 16
            incr x
        }
    } elseif {$bpp == 24} {
        foreach {b g r} [split $xor {}] a [split $and {}] {
            if {$x == $w} { set x 0; incr y -1 }
            if {$a == 0} {
                lset colors $y $x [formatColor $r $g $b]
            }
            incr x
        }
    } elseif {$bpp == 32} {
	foreach {b g r n} [split $xor {}] a [split $and {}] {
	    if {$x == $w} { set x 0; incr y -1 }
	    if {$a == 0} {
                lset colors $y $x [formatColor $r $g $b]
	    }
	    incr x
	}
    }
    return $colors
}

# creates a binary formatted AND mask by reading a list of colors in the decimal list format
# and checking for empty colors which designate transparency
proc ::ico::getAndMaskFromColors {colors} {
    set and {}
    foreach line $colors {
	set l {}
	foreach x $line {append l [expr {$x eq ""}]}
	set w [string length $l]
	append l [string repeat 0 [expr {($w == 24) ? 8 : ($w % 32)}]]
	foreach {a b c d e f g h} [split $l {}] {
	    append and [binary format B8 $a$b$c$d$e$f$g$h]
	}
    }
    return $and
}

# creates a binary formatted XOR mask in the specified depth format from
# a list of colors in the decimal list format
proc ::ico::getXORFromColors {bpp colors} {
    set xor {}
    if {$bpp == 1} {
	foreach line $colors {
	    foreach {a b c d e f g h} $line {
                foreach x {a b c d e f g h} {
                    if {[set $x] == ""} {set $x 0}
		}
		binary scan $a$b$c$d$e$f$g$h bbbbbbbb h g f e d c b a
		append xor [binary format b8 $a$b$c$d$e$f$g$h]
	    }
	}
    } elseif {$bpp == 4} {
	foreach line $colors {
	    foreach {a b} $line {
		if {$a == ""} {set a 0}
		if {$b == ""} {set b 0}
		binary scan $a$b b4b4 b a
		append xor [binary format b8 $a$b]
	    }
	}
    } elseif {$bpp == 8} {
	foreach line $colors {
	    foreach x $line {
		if {$x == ""} {set x 0}
		append xor [binary format c $x]
	    }
	}
    } elseif {$bpp == 24} {
	foreach line $colors {
	    foreach x $line {
		if {![llength $x]} {
		    append xor [binary format ccc 0 0 0]
		} else {
		    foreach {a b c n} $x {
			append xor [binary format ccc $c $b $a]
		    }
		}
	    }
	}
    } elseif {$bpp == 32} {
	foreach line $colors {
	    foreach x $line {
		if {![llength $x]} {
		    append xor [binary format cccc 0 0 0 0]
		} else {
		    foreach {a b c n} $x {
			if {$n == ""} {set n 0}
			append xor [binary format cccc $c $b $a $n]
		    }
		}
	    }
	}
    }
    return $xor
}

# translates a Tk image into a list of colors in the {r g b} format
# one element per pixel and {} designating transparent
# used by writeIcon when writing from a Tk image
proc ::ico::getColorListFromImage {img} {
    package require Tk
    set w [image width $img]
    set h [image height $img]
    set r {}
    for {set y [expr $h - 1]} {$y > -1} {incr y -1} {
	set l {}
	for {set x 0} {$x < $w} {incr x} {
	    if {[$img transparency get $x $y]} {
		lappend l {}
	    } else {
		lappend l [$img get $x $y]
	    }
	}
	lappend r $l
    }
    return $r
}

# creates a palette from a list of colors in the decimal list format
# a palette consists of 3 values, the number of colors, the palette entry itself,
# and the color list transformed to point to palette entries instead of color names
# the palette entry itself is stored as 32bpp in "G B R padding" order
proc ::ico::getPaletteFromColors {colors} {
    # set palette "\x00\x00\x00\x00"
    # array set tpal {{0 0 0} 0}
    set new {}
    set i 0
    foreach line $colors {
	set tline {}
      foreach x $line {

	if {$x eq {{} {} {}}} {lappend tline {}; continue}
	    if {![info exists tpal($x)]} {
		foreach {a b c n} $x {
		    append palette [binary format cccc $c $b $a 0]
		}
		set tpal($x) $i
		incr i
	    }
	    lappend tline $tpal($x)
	}
	lappend new $tline
    }
    return [list $i $palette $new]
}

# calculate byte size of an icon.
# often passed $w twice because $h is double $w in the binary data
proc ::ico::calcSize {w h bpp {offset 0}} {
    set s [expr {int(($w*$h) * ($bpp/8.0)) +
		 ((($w*$h) + ($h*(($w==24) ? 8 : ($w%32))))/8) + $offset}]
    if {$bpp <= 8} { set s [expr {$s + (1 << ($bpp + 2))}] }
    return $s
}

# read a Device Independent Bitmap from the current offset, return:
#	{width height depth palette XOR_mask AND_mask}
proc ::ico::readDIB {fh} {
    binary scan [read $fh 16] x4iix2s w h bpp
    set h [expr {$h / 2}]
    seek $fh 24 current

    set palette [list]
    if {$bpp == 1 || $bpp == 4 || $bpp == 8} {
	set colors [read $fh [expr {1 << ($bpp + 2)}]]
	foreach {b g r x} [split $colors {}] {
	    lappend palette [formatColor $r $g $b]
	}
    } elseif {$bpp == 16 || $bpp == 24 || $bpp == 32} {
	# do nothing here
    } else {
	return -code error "unsupported color depth: $bpp"
    }

    set xor  [read $fh [expr {int(($w * $h) * ($bpp / 8.0))}]]
    set and1 [read $fh [expr {(($w * $h) + ($h * (($w == 24) ? 8 : ($w % 32)))) / 8}]]

    set and {}
    set row [expr {((($w - 1) / 32) * 32 + 32) / 8}]
    set len [expr {$row * $h}]
    for {set i 0} {$i < $len} {incr i $row} {
	binary scan [string range $and1 $i [expr {$i + $row}]] B$w tmp
	append and $tmp
    }

    return [list $w $h $bpp $palette $xor $and]
}

# read a Device Independent Bitmap from raw data, return:
#	{width height depth palette XOR_mask AND_mask}
proc ::ico::readDIBFromData {data loc} {
    # Read info from location
    binary scan $data @${loc}x4iix2s w h bpp
    set h [expr {$h / 2}]
    # Move over w/h/bpp info + magic offset to start of DIB
    set cnt [expr {$loc + 16 + 24}]

    set palette [list]
    if {$bpp == 1 || $bpp == 4 || $bpp == 8} {
	# Could do: [binary scan $data @${cnt}c$len colors]
	# and iter over colors, but this is more consistent with $fh version
	set len    [expr {1 << ($bpp + 2)}]
	set colors [string range $data $cnt [expr {$cnt + $len - 1}]]
	foreach {b g r x} [split $colors {}] {
	    lappend palette [formatColor $r $g $b]
	}
	incr cnt $len
    } elseif {$bpp == 16 || $bpp == 24 || $bpp == 32} {
	# do nothing here
    } else {
	return -code error "unsupported color depth: $bpp"
    }

    # Use -1 to account for string range inclusiveness
    set end  [expr {$cnt + int(($w * $h) * ($bpp / 8.0)) - 1}]
    set xor  [string range $data $cnt $end]
    set and1 [string range $data [expr {$end + 1}] \
		  [expr {$end + ((($w * $h) + ($h * (($w == 24) ? 8 : ($w % 32)))) / 8) - 1}]]

    set and {}
    set row [expr {((($w - 1) / 32) * 32 + 32) / 8}]
    set len [expr {$row * $h}]
    for {set i 0} {$i < $len} {incr i $row} {
	# Has to be decoded by row, in order
	binary scan [string range $and1 $i [expr {$i + $row}]] B$w tmp
	append and $tmp
    }

    return [list $w $h $bpp $palette $xor $and]
}

proc ::ico::getIconListICO {file} {
    set fh [open $file r]
    fconfigure $fh -eofchar {} -encoding binary -translation lf

    if {"[getword $fh] [getword $fh]" ne "0 1"} {
	return -code error "not an icon file"
    }
    close $fh
    return 0
}

proc ::ico::getIconListICODATA {data} {
    if {[binary scan $data sss h1 h2 num] != 3 || $h1 != 0 || $h2 != 1} {
	return -code error "not icon data"
    }
    return 0
}

proc ::ico::getIconListBMP {file} {
    set fh [open $file]
    if {[read $fh 2] != "BM"} { close $fh; return -code error "not a BMP file" }
    close $fh
    return 0
}

proc ::ico::getIconListEXE {file} {
    variable RES

    set file [file normalize $file]
    if {[FindResources $file] > -1} {
        return $RES($file,group,names)
    } else {
        return ""
    }
}

# returns a list of images that make up the named icon
# as tuples {name width height bpp}. Called by [iconMembers]
proc ::ico::getIconMembersICO {file name} {
    variable RES

    if {$name ne "0"} { return -code error "no icon \"$name\"" }
    set file [file normalize $file]
    if {[info exists RES($file,group,$name,members)]} {
        set ret ""
        foreach x $RES($file,group,$name,members) {
            lappend ret [linsert $RES($file,icon,$x,data) 0 $x]
        }
        return $ret
    }

    set fh [open $file r]
    fconfigure $fh -eofchar {} -encoding binary -translation lf

    # both words must be read to keep in sync with later reads
    if {"[getword $fh] [getword $fh]" ne "0 1"} {
        close $fh
	return -code error "not an icon file"
    }

    set ret ""
    set num [getword $fh]
    for {set i 0} {$i < $num} {incr i} {
        set info ""
        lappend RES($file,group,$name,members) $i
	    # D.R. LaBelle - The following line has been replaced in order to handle 256 x 256 icons.
	    #lappend info [scan [read $fh 1] %c] [scan [read $fh 1] %c]
	    set width [scan [read $fh 1] %c]
	    set height [scan [read $fh 1] %c]
	    if {$width == 0} { set width 256}
	    if {$height == 0} { set height 256 }
	    lappend info $width $height
		# End of replacement lines.
	    set bpp [scan [read $fh 1] %c]
        if {$bpp == 0} {
	    set orig [tell $fh]
	    seek $fh 9 current
	    seek $fh [expr {[getdword $fh] + 14}] start
	    lappend info [getword $fh]
	    seek $fh $orig start
	} else {
	    lappend info [expr {int(sqrt($bpp))}]
	}
	lappend ret [linsert $info 0 $i]
	set RES($file,icon,$i,data) $info
	seek $fh 13 current
    }
    close $fh
    return $ret
}

# returns a list of images that make up the named icon
# as tuples {name width height bpp}. Called by [iconMembers]
proc ::ico::getIconMembersICODATA {data} {
    if {[binary scan $data sss h1 h2 num] != 3 || $h1 != 0 || $h2 != 1} {
	return -code error "not icon data"
    }
    set r {}
    set cnt 6
    for {set i 0} {$i < $num} {incr i} {
	if {[binary scan $data @${cnt}cucucu w h bpp] != 3} {
	    _freewrap_writefile dtemp[clock microseconds] "Error decoding icon data"
	    return -code error "error decoding icon data"
	}
	    _freewrap_writefile dtemp[clock microseconds] "$w $h $bpp"
	incr cnt 3
	set info [list $i $w $h]
	if {$bpp == 0} {
	    set off [expr {$cnt + 9}]
	    binary scan $data @${off}i off
	    incr off 14
	    binary scan $data @${off}s bpp
	    lappend info $bpp
	} else {
	    lappend info [expr {int(sqrt($bpp))}]
	}
	lappend r $info
	incr cnt 13
    }
    return $r
}

# returns a list of images that make up the named icon
# as tuples {name width height bpp}. Called by [iconMembers]
proc ::ico::getIconMembersBMP {file {name 0}} {
    if {$name ne "0"} { return -code error "no icon \"$name\"" }
    set fh [open $file]
    if {[read $fh 2] != "BM"} { close $fh; return -code error "not a BMP file" }
    seek $fh 14 start
    binary scan [read $fh 16] x4iix2s w h bpp
    close $fh
    return [list 1 $w $h $bpp]
}

# returns a list of images that make up the named icon
# as tuples {name width height bpp}. Called by [iconMembers]
proc ::ico::getIconMembersEXE {file name} {
    variable RES
    set file [file normalize $file]
    FindResources $file
    if {![info exists RES($file,group,$name,members)]} { return -code error "no icon \"$name\"" }
    set ret ""
    foreach x $RES($file,group,$name,members) {
        lappend ret [linsert $RES($file,icon,$x,data) 0 $x]
    }
    return $ret
}

# returns an icon in the form:
#       {width height depth palette xor_mask and_mask}
proc ::ico::getRawIconDataICO {file name} {
    set fh [open $file r]
    fconfigure $fh -eofchar {} -encoding binary -translation lf

    # both words must be read to keep in sync with later reads
    if {"[getword $fh] [getword $fh]" ne "0 1"} {
        close $fh
        return -code error "not an icon file"
    }
    set num [getword $fh]
    if {![string is integer -strict $name] ||\
	    $name < 0 ||\
	    $name >= $num} { return -code error "no icon \"$name\"" }

    seek $fh [expr {(16 * $name) + 12}] current
    seek $fh [getdword $fh] start

    # readDIB returns: {w h bpp palette xor and}
    set dib [readDIB $fh]

    close $fh
    return $dib
}

# returns an icon in the form:
#       {width height depth palette xor_mask and_mask}
proc ::ico::getRawIconDataICODATA {data name} {
    if {[binary scan $data sss h1 h2 num] != 3 || $h1 != 0 || $h2 != 1} {
	return -code error "not icon data"
    }
    if {![string is integer -strict $name] || $name < 0 || $name >= $num} {
	return -code error "No icon $name"
    }
    # Move to ico location
    set cnt [expr {6 + (16 * $name) + 12}]
    binary scan $data @${cnt}i loc

    # readDIB returns: {w h bpp palette xor and}
    set dib [readDIBFromData $data $loc]

    return $dib
}

# returns an icon in the form:
#	{width height depth palette xor_mask and_mask}
proc ::ico::getRawIconDataBMP {file {name 1}} {
    # if {$name ne "1"} {return -code error "No icon \"$name\""}
    set fh [open $file]
    fconfigure $fh -eofchar {} -encoding binary -translation lf
    if {[read $fh 2] != "BM"} { close $fh; return -code error "not a BMP file" }
    seek $fh 0xA start
    binary scan [read $fh 20] iiiix2s colorAd dibSz w h bpp
    seek $fh 0x22 start
    binary scan [read $fh 4] i colorSz
    seek $fh [expr {$dibSz + 0xE}] start
    set palette [list]
    if {$bpp == 1 || $bpp == 4 || $bpp == 8} {
        set colors [read $fh [expr {1 << ($bpp + 2)}]]
        foreach {b g r x} [split $colors {}] {
            lappend palette [formatColor $r $g $b]
        }
    } elseif {$bpp == 16 || $bpp == 24 || $bpp == 32} {
        # do nothing here
    } else {
        return -code error "unsupported color depth: $bpp"
    }
    set xor  [read $fh [expr {int(($w * $h) * ($bpp / 8.0))}]]
    set and [string repeat 0 [expr {$w * $h}]]
    close $fh

    return [list $w $h $bpp $palette $xor $and]
}

# returns an icon in the form:
#	{width height depth palette xor_mask and_mask}
proc ::ico::getRawIconDataEXE {file name} {
    variable RES

    set file [file normalize $file]
    FindResources $file

    if {![info exists RES($file,icon,$name,offset)]} { error "No icon \"$name\"" }
    set fh [open $file]
    fconfigure $fh -eofchar {} -encoding binary -translation lf
    seek $fh $RES($file,icon,$name,offset) start

    # readDIB returns: {w h bpp palette xor and}
    set dib [readDIB $fh]
    close $fh
    return $dib
}

proc ::ico::writeIconICO {file name w h bpp palette xor and} {
    if {![file exists $file]} {
	set fh [open $file w+]
	fconfigure $fh -eofchar {} -encoding binary -translation lf
	set num 0
    } else {
	set fh [open $file r+]
	fconfigure $fh -eofchar {} -encoding binary -translation lf
	if {"[getword $fh] [getword $fh]" ne "0 1"} {
	    close $fh
	    return -code error "not an icon file"
	}
      # get num (number of icons in the file) and 'seek' end of directory
	set num [getword $fh]
	seek $fh [expr {6 + (16 * $num)}] start
    }

    set size [expr {[string length $palette] +\
			[string length $xor] +\
			[string length $and]}]
    set newicon [binary format iiissiiiiii 40 $w\
		     [expr {$h * 2}] 1 $bpp 0 $size 0 0 0 0]$palette$xor$and

    set data {}
    for {set i 0} {$i < $num} {incr i} {
        binary scan [read $fh 24] ix16i a b
        seek $fh -24 current
        lappend data [read $fh [expr {$a + $b}]]
    }

    if {![string is integer -strict $name] || $name < 0 || $name >= $num} {
        set name [llength $data]
        lappend data $newicon
    } else {
        set data [lreplace $data $name $name $newicon]
    }
    set num [llength $data]

    seek $fh 0 start
    bputs $fh sss 0 1 $num
    set offset [expr {6 + (16 * $num)}]
    foreach x $data {
        binary scan $x x4iix2s w h bpp
        set len [string length $x]
	# use original height in icon table header
	bputs $fh ccccssii $w [expr {$h / 2}] \
	    [expr {$bpp <= 8 ? 1 << $bpp : 0}] 0 0 $bpp $len $offset
        incr offset $len
    }
    puts -nonewline $fh [join $data {}]
    #  The truncate is needed in the case where we replace a larger icon
    chan truncate $fh
    close $fh

    return $name
}

proc ::ico::writeIconICODATA {file name w h bpp palette xor and} {
    upvar 2 [file tail $file] input
    if {![info exists input] || ([binary scan $input sss h1 h2 num] != 3 || $h1 != 0 || $h2 != 1)} {
	set num 0
    }

    set size [expr {[string length $palette] + [string length $xor] + [string length $and]}]
    set newicon [binary format iiissiiiiii 40 $w [expr {$h * 2}] 1 $bpp 0 $size 0 0 0 0]$palette$xor$and

    set readpos [expr {6 + (16 * $num)}]
    set data {}
    for {set i 0} {$i < $num} {incr i} {
        binary scan $input @{$readpos}ix16i a b
        lappend data [string range $data $readpos [expr {$readpos + $a + $b}]]
        incr readpos [expr {$readpos + $a + $b}]
    }

    if {![string is integer -strict $name] || $name < 0 || $name >= $num} {
        set name [llength $data]
        lappend data $newicon
    } else {
        set data [lreplace $data $name $name $newicon]
    }
    set num [llength $data]

    set new [binary format sss 0 1 $num]
    set offset [expr {6 + (16 * $num)}]
    foreach x $data {
        binary scan $x x4iix2s w h bpp
        set len [string length $x]
	# use original height in icon table header
        append new [binary format ccccssii $w [expr {$h / 2}] [expr {$bpp <= 8 ? 1 << $bpp : 0}] 0 0 $bpp $len $offset]
        incr offset $len
    }
    set input $new
    append input [join $data {}]

    return $name
}

proc ::ico::writeIconBMP {file name w h bpp palette xor and} {
    set fh [open $file w+]
    fconfigure $fh -eofchar {} -encoding binary -translation lf
    set size [expr {[string length $palette] + [string length $xor]}]
    # bitmap header: magic, file size, reserved, reserved, offset of bitmap data
    bputs $fh a2issi BM [expr {14 + 40 + $size}] 0 0 54
    bputs $fh iiissiiiiii 40 $w $h 1 $bpp 0 $size 0 0 0 0
    puts -nonewline $fh $palette$xor
    close $fh
}

proc ::ico::writeIconEXE {file name w h bpp palette xor and} {
    variable RES

    set file [file normalize $file]
    FindResources $file

    if {![info exists RES($file,icon,$name,data)]} {
	return -code error "no icon \"$name\""
    }
    if {"$w $h $bpp" != $RES($file,icon,$name,data)} {
	return -code error "icon format differs from original"
    }
    
    set fh [open $file r+]
    fconfigure $fh -eofchar {} -encoding binary -translation lf
    seek $fh [expr {$RES($file,icon,$name,offset) + 40}] start

    puts -nonewline $fh $palette$xor$and
    close $fh
}

proc ::ico::FindResources {file} {
    variable RES

    if {[info exists RES($file,group,names)]} {
        return [llength $RES($file,group,names)]
    }

    set fh [open $file]
    fconfigure $fh -eofchar {} -encoding binary -translation lf
    if {[read $fh 2] ne "MZ"} {
	close $fh
	return -code error "file is not a valid executable"
    }
    seek $fh 60 start
    seek $fh [getword $fh] start
    set sig [read $fh 4]
    seek $fh -4 current
    if {$sig eq "PE\000\000"} {
        return [FindResourcesPE $fh $file]
    } elseif {[string match NE* $sig]} {
        return [FindResourcesNE $fh $file]
    } else {
        return -code error "file is not a valid executable"
    }
}

# parse the resource table of 16 bit windows files for icons
proc ::ico::FindResourcesNE {fh file} {
    variable RES

    seek $fh 36 current
    seek $fh [expr {[getword $fh] - 38}] current
    set base [tell $fh]
    set shift [expr {int(pow(2, [getushort $fh]))}]
    while {[set type [expr {[getushort $fh] & 0x7fff}]] != 0} {
        set num [getushort $fh]
        if {$type != 3 && $type != 14} {
            seek $fh [expr {($num * 12) + 4}] current
            continue
        }
        set type [string map {3 icon 14 group} $type]
        seek $fh 4 current
        for {set i 0} {$i < $num} {incr i} {
            set offset [expr {[getushort $fh] * $shift}]
            seek $fh 4 current
            set name [getNEResName $fh $base [getushort $fh]]
            set RES($file,$type,$name,offset) $offset
            lappend RES($file,$type,names) $name
            seek $fh 4 current
        }
    }
    if {[array names RES $file,*] == ""} {
        close $fh
        return -1
    }
    foreach x [array names RES $file,group,*,offset] {
        seek $fh [expr {$RES($x) + 4}] start
        binary scan [read $fh 2] s a
        set x [lindex [split $x ,] 2]
        for {set i 0} {$i < $a} {incr i} {
            binary scan [read $fh 14] x12s n
            lappend RES($file,group,$x,members) $n
        }
    }
    foreach x [array names RES $file,icon,*,offset] {
        seek $fh [expr {$RES($x)}] start
        set x [lindex [split $x ,] 2]
        binary scan [read $fh 16] x4iix2s w h bpp
        set RES($file,icon,$x,data) [list $w [expr {$h / 2}] $bpp]
    }
    close $fh
    return [llength $RES($file,group,names)]
}

proc ::ico::getNEResName {fh base data} {
    if {$data == 0} {
        return 0
    }
    binary scan $data b* tmp
    if {[string index $tmp 0] == 0} {
        set cur [tell $fh]
        seek $fh [expr {$data + $base}] start
        binary scan [read $fh 1] c len
        set name [read $fh $len]
        seek $fh $cur start
        return $name
    } else {
        return [expr {$data & 0x7fff}]
    }
}

# parse the resource tree of 32 bit windows files for icons
proc ::ico::FindResourcesPE {fh file} {
    variable RES

    # find the .rsrc section by reading the coff header
    binary scan [read $fh 24] x6sx12s sections headersize
    seek $fh $headersize current
    for {set i 0} {$i < $sections} {incr i} {
        binary scan [read $fh 40] a8x4ix4i type baserva base
        if {[string match .rsrc* $type]} {break}
    }
    # no resource section found = no icons
    if {![string match .rsrc* $type]} {
        close $fh
        return -1
    }
    seek $fh $base start

    seek $fh 12 current
    # number of entries in the resource table. each one is a different resource type
    set entries [expr {[getushort $fh] + [getushort $fh]}]
    for {set i 0} {$i < $entries} {incr i} {
        set type [getulong $fh]
        set offset [expr {[getulong $fh] & 0x7fffffff}]
        if {$type != 3 && $type != 14} {continue}
        set type [string map {3 icon 14 group} $type]

        set cur [tell $fh]
        seek $fh [expr {$base + $offset + 12}] start
        set entries2 [expr {[getushort $fh] + [getushort $fh]}]
        for {set i2 0} {$i2 < $entries2} {incr i2} {
            set name [getPEResName $fh $base [getulong $fh]]
            lappend RES($file,$type,names) $name
            set offset [expr {[getulong $fh] & 0x7fffffff}]

            set cur2 [tell $fh]
            seek $fh [expr {$offset + $base + 12}] start
            set entries3 [expr {[getushort $fh] + [getushort $fh]}]
            for {set i3 0} {$i3 < $entries3} {incr i3} {
                seek $fh 4 current
                set offset [expr {[getulong $fh] & 0x7fffffff}]
                set cur3 [tell $fh]

                seek $fh [expr {$offset + $base}] start
                set rva [getulong $fh]
                set RES($file,$type,$name,offset) [expr {$rva - $baserva + $base}]

                seek $fh $cur3 start
            }

            seek $fh $cur2 start
        }
        seek $fh $cur start
    }
    if {[array names RES $file,*] == ""} {
        close $fh
        return -1
    }
    foreach x [array names RES $file,group,*,offset] {
        seek $fh [expr {$RES($x) + 4}] start
        binary scan [read $fh 2] s a
        set x [lindex [split $x ,] 2]
        for {set i 0} {$i < $a} {incr i} {
            binary scan [read $fh 14] x12s n
            lappend RES($file,group,$x,members) $n
        }
    }
    foreach x [array names RES $file,icon,*,offset] {
        seek $fh [expr {$RES($x)}] start
        set x [lindex [split $x ,] 2]
        binary scan [read $fh 16] x4iix2s w h bpp
        set RES($file,icon,$x,data) [list $w [expr {$h / 2}] $bpp]
    }

    close $fh
    return [llength $RES($file,group,names)]
}

proc ::ico::getPEResName {fh start data} {
    if {($data & 0x80000000) != 0} {
        set cur [tell $fh]
        seek $fh [expr {($data & 0x7fffffff) + $start}] start
        set len [getushort $fh]
        set name [read $fh [expr {$len * 2}]]
        seek $fh $cur start
        return [encoding convertfrom unicode $name]
    } else {
        return $data
    }
}

# Application level command: Find icons in a file and show them.
# Provided as a demonstration of pulling all icons by resource from a file.
proc ::ico::Show {file args} {
    package require BWidget

    set parent . 
    parseOpts {parent} $args

    set file  [file normalize $file]
    set icos  [icons $file]
    set wname [string map {. _ : _} $file]

    if {$parent eq "."} { set w "" } else { set w $parent }

    set mf $w.iconsw
    if {![winfo exists $mf]} {
	set sw [ScrolledWindow $mf]
	set sf [ScrollableFrame $mf.sf -constrainedwidth 1]
	$sw setwidget $sf
      # pack $sw -fill both -expand 1
        grid $sw -sticky news
	grid columnconfigure [$mf.sf getframe] 0 -weight 1
    }
    set mf [$mf.sf getframe]

    set lf $mf.f$wname
    if {[winfo exists $lf]} { destroy $lf }
    if {![llength $icos]} {
	label $lf -text "No icons in '$file'" -anchor w
	grid $lf -sticky ew
    } else {
      labelframe $lf -text "[llength $icos] Icon resource(s) in:\n'[file tail $file]'"
	grid $lf -sticky news
	set sw [ScrolledWindow $lf.sw$wname]
	set height 48
	set fh [expr {[font metrics [$lf cget -font] -linespace] + 4}]
	set sf [ScrollableFrame $lf.sf$wname -constrainedheight 1 \
		    -height [expr {$height + $fh}]]
	$sw setwidget $sf
	set sf [$sf getframe]
      # pack $sw -fill both -expand 1
        grid $sw -sticky news
	set col 0
	foreach icon $icos {
	    foreach mem [iconMembers $file $icon] {
		foreach {name w h bpp} $mem { break }
		# catch in case theres any icons with unsupported color
		if {[catch {getIconByName $file $name} img]} {
		    set txt "ERROR: $img"
		    set lbl [label $sf.lbl$wname-x -anchor w -text $txt]
		    grid $lbl -sticky s -row 0 -column [incr col]
		} else {
		    set txt "$name: ${w}x${h} ${bpp}bpp"
		    set lbl [label $sf.lbl$wname$name -anchor w -text $txt \
				 -compound top -image $img]
		    if {[image height $img] > $height} {
			set height [image height $img]
			$lf.sf$wname configure -height [expr {$height + $fh}]
		    }
		    grid $lbl -sticky s -row 0 -column [incr col]
		}
		update idletasks
	    }
	}
    }
    grid rowconfigure $parent 0 -weight 1
    grid columnconfigure $parent 0 -weight 1
}

interp alias {} ::ico::getIconListDLL    {} ::ico::getIconListEXE
interp alias {} ::ico::getIconMembersDLL {} ::ico::getIconMembersEXE
interp alias {} ::ico::getRawIconDataDLL {} ::ico::getRawIconDataEXE
interp alias {} ::ico::writeIconDLL      {} ::ico::writeIconEXE
interp alias {} ::ico::getIconListICL    {} ::ico::getIconListEXE
interp alias {} ::ico::getIconMembersICL {} ::ico::getIconMembersEXE
interp alias {} ::ico::getRawIconDataICL {} ::ico::getRawIconDataEXE
interp alias {} ::ico::writeIconICL      {} ::ico::writeIconEXE

package provide ico 1.1
