"SfR Fresh" - the SfR Freeware/Shareware Archive

Member "OpenVerse/lib/GifHeader.tcl" of archive OpenVerse-0.8-7.tar.gz:

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    1 #!/usr/bin/tclsh
    2 #
    3 # changed
    4 #
    5 # This will read in a gif file header and decide
    6 # if it is within bounds. (or even a valid file)
    7 #
    8 
    9 proc CheckGif {file} {
   10 	global MV
   11 
   12 	set infile [open $file r]
   13 	fconfigure $infile -translation binary
   14 	set bits [read $infile 10]
   15 	close $infile
   16 	binary scan $bits c* var1
   17 	if {[string range $bits 0 2] != "GIF"} {puts "FAILED";return 0}
   18 	binary scan $bits s* var2
   19 	if {[lindex $var2 3] < $MV(maxheight) & [lindex $var2 4] < $MV(maxwidth)} {
   20 		puts "PASSED"
   21 		return 1
   22 	} else {
   23 		puts "FAILED"
   24 		return 0
   25 	}
   26 }