# NOTE: Initialize list of platforms to return.  This will be populated
    #       based on the platform directories available in the downloaded
    #       manfiest data.
    #
    set platforms [list]

    #
    # NOTE: Read the (OpenPGP verified) Fossil manifest data from the local
    #       file and split it into lines.
    # NOTE: Read the (OpenPGP verified) manifest data from the local file
    #       and split it into lines.
    #
    set data [readFile $localFileName]; set lines [split $data \n]

    #
    # NOTE: Figure out the pattern to use when matching against the file
    #       names in the manifest data.  If available, this will include
    #       the package name; otherwise, platform names for all packages
    #       will be considered.
    #
    if {[string length $packageName] > 0} then {
      set pattern [file join $language $version * $packageName *]
    } else {
      set pattern [file join $language $version *]
    }

    foreach line $lines {
      if {[string range $line 0 1] eq "F "} then {
        set fileName [lindex [split $line " "] 1]

        if {[string match [file join \
        if {[string match $pattern $fileName]} then {
            $language $version * $packageName *] $fileName]} then {
          set directory [lindex [file split $fileName] 2]

          if {[string length $directory] > 0} then {
            lappend platforms $directory
          }
        }
      }