}
      }
    }

    return ""
  }






























  #
  # NOTE: This procedure verifies the platform specified by the caller.  The
  #       platform argument must be an empty string -OR- one of the literal
  #       strings "neutral", "win32-arm", "win32-x86", "win64-arm64",
  #       "win64-ia64", or "win64-x64".  An empty string means that the
  #       associated entity does not require a specific platform.  The
  #       varName argument is the name of a variable in the context of the

    } else {
      file delete -force -- $temporaryDirectory
    }

    return [expr {$compare > 0}]
  }

  #
  # NOTE: This procedure attempts to guess a package name based on a list of
  #       its files.  It relies upon the fact that all packages must include
  #       a package index file.  The language argument must be one of the
  #       literal strings "eagle", "tcl", or "client".  The fileNames argument
  #       must be the list of file names to be downloaded.  The package name,
  #       if one can be detected, is returned; otherwise, an empty string will
  #       be returned.
  #
  proc guessPackageNameFromFileNames { language fileNames } {
    set packageIndexFileName [getPackageIndexFileName $language]

    if {[string length $packageIndexFileName] > 0} then {
      foreach fileName $fileNames {
        set fileNameOnly [file tail $fileName]

        if {$fileNameOnly eq $packageIndexFileName} then {
          set directory [file dirname $fileName]

          if {[string length $directory] > 0} then {
            return [file tail $directory]
          }
        }
      }
    }

    return ""
  }

  #
  # NOTE: This procedure downloads a manitest from the package file server,
  #       writing its contents to the specified local file name.  It can also
  #       verify the OpenPGP signature.  The language argument must be one of
  #       the literal strings "eagle", "tcl", or "client".  The version
  #       argument must be one of the literal strings "8.4", "8.5", or "8.6"
  #       when the language is "tcl" -OR- the literal string "1.0" when the

    #
    set uri [subst $platformsUri]

    #
    # NOTE: Then, in one step, download the file from the package file
    #       server and write it to the specified local file.
    #
    downloadOneUriToFile $localFileName $uri $usePgp


















    #
    # 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]

    } else {
      file delete -force -- $temporaryDirectory
    }

    return [lsort -unique $platforms]
  }

  #
  # NOTE: This procedure downloads a single URI from the package file server
  #       and writes the result to a local file.  The localFileName argument
  #       is the file name where the downloaded file should be written.  The
  #       The uri argument is the URI to download.  The usePgp argument should
  #       be non-zero when the OpenPGP signature file needs to be verified for
  #       the downloaded file.  The return value is undefined.
  #
  proc downloadOneUriToFile { localFileName uri usePgp } {
    #
    # NOTE: Then, in one step, download the URI from the package file
    #       server and write it to the specified local file.
    #
    writeFile $localFileName [getPackageFile $uri]

    #
    # NOTE: Is use of OpenPGP for signature verification enabled?  Also,
    #       did we just download an OpenPGP signature file?
    #
    if {$usePgp && [isOpenPgpSignatureFileName $localFileName true]} then {
      #
      # NOTE: Attempt to verify the OpenPGP signature.  If this fails,
      #       an error is raised.
      #
      ::PackageRepository::openPgpMustBeInstalled

      if {![::PackageRepository::verifyOpenPgpSignature $localFileName]} then {
        error [appendArgs \
            "bad OpenPGP signature \"" $localFileName \"]
      }
    }
  }

  #
  # NOTE: This procedure downloads a single file from the package file server,
  #       writing its contents to the specified local file name.  It can also
  #       verify the OpenPGP signatures.  When an OpenPGP signature file is
  #       downloaded, this procedure assumes the corresponding data file was
  #       already downloaded (i.e. since OpenPGP needs both to perform the
  #       signature checks).  The language argument must be one of the

    # NOTE: First, build the full relative file name to download from
    #       the remote package repository.
    #
    set fileName [file join $language $version $platform $fileName]
    set uri [subst $downloadUri]

    #
    # NOTE: Download the file from the package file server, based on the











    #       final URI.
    #




    downloadOneUriToFile $localFileName $uri $usePgp


  }

  #
  # NOTE: This procedure attempts to download a list of files, optionally
  #       persistening them for subsequent uses by the target language.
  #       The language argument must be one of the literal strings "eagle",
  #       "tcl", or "client".  The version argument must be one of the

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