set isClient true
    } else {
      error "unsupported language"
    }
  }

  #
  # NOTE: This procedure verifies the platform specified by the caller.  The
  #       platform argument must be an empty string -OR- one of the literal
  #       strings "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.  Upon failure, a script error will
  #       be raised.  The return value is undefined.
  #
  proc verifyPlatform { platform varName } {
    switch -exact -- $platform {
      "" {
        #
        # NOTE: This platform name is supported; however, the name needs
        #       to be normalized to "neutral".
        #
        if {[string length $varName] > 0} then {
          upvar 1 $varName newPlatform; set newPlatform neutral
        }
      }
      win32-arm -
      win32-x86 -
      win64-arm64 -
      win64-ia64 -
      win64-x64 {
        #
        # NOTE: This platform name is supported verbatim, do nothing.
        #
      }
      default {
        error "unsupported platform"
      }
    }
  }

  #
  # NOTE: This procedure issues a request to an HTTP(S) server.  It returns
  #       the raw response data verbatim.  It may raise a script error.  It
  #       will always use the currently configured HTTP(S) login cookie, if
  #       any; therefore, it should really only be used for requests to the
  #       package file server.  The uri argument is the fully qualified URI
  #       to request.


  #
  # NOTE: This procedure checks if there is a higher version available of the
  #       specified package on the package file server.  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 language is either "eagle" or "client".  The platform argument
  #       must be an empty string -OR- one of the literal strings "win32-arm",
  #       "win32-x86", "win64-arm64", "win64-ia64", or "win64-x64".  An empty
  #       string means that the associated package does not require a specific
  #       platform.  The packageName argument is a directory name relative to
  #       the language and version-specific directory on the package file
  #       server and may be an empty string.  The usePgp argument should be
  #       non-zero when an OpenPGP signature file needs to be downloaded and
  #       verified for the downloaded file.
  #
  # <public>
  proc checkForHigherVersion { language version platform packageName usePgp } {
    variable clientDirectory
    variable persistentRootDirectory
    variable temporaryRootDirectory

    verifyLanguageAndVersion $language $version isClient
    verifyPlatform $platform platform

    set temporaryDirectory [file join \
        $temporaryRootDirectory [appendArgs \
        pkgd_ver_ [::PackageRepository::getUniqueSuffix]]]

    if {$isClient} then {
      set persistentDirectory $clientDirectory
    } else {
      verifyPersistentRootDirectory
      set persistentDirectory $persistentRootDirectory
    }

    set fileName [file join $packageName VERSION]
    set downloadFileName [file join $temporaryDirectory $fileName]

    file mkdir [file dirname $downloadFileName]

    downloadOneFile $language $version $platform \
        $fileName $downloadFileName $usePgp

    if {$usePgp} then {
      downloadOneFile $language $version $platform \
          [appendArgs $fileName .asc] \
          [appendArgs $downloadFileName .asc] $usePgp
    }

    set localFileName [file join $persistentDirectory $fileName]

    set compare [package vcompare \
        [string trim [readFile $downloadFileName]] \

  #       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
  #       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 language
  #       is either "eagle" or "client".  The platform argument must be an
  #       empty string -OR- one of the literal strings "win32-arm",
  #       "win32-x86", "win64-arm64", "win64-ia64", or "win64-x64".  An empty
  #       string means that the associated package does not require a specific
  #       platform.  The fileName argument is a file name relative to the
  #       language and version-specific directory on the package file server.
  #       The localFileName argument is the file name where the downloaded
  #       file should be written.  The usePgp argument should be non-zero when
  #       an OpenPGP signature file needs to be downloaded and verified for
  #       the downloaded file.
  #
  proc downloadOneFile {
          language version platform fileName localFileName usePgp } {
    variable baseUri
    variable downloadUri
    variable downloadUrn

    #
    # 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: Then, in one step, download the file from the package file
    #       server and write it to the specified local file.
    #
    writeFile $localFileName [getPackageFile $uri]

  #
  # 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
  #       literal strings "8.4", "8.5", or "8.6" when the language is "tcl"
  #       -OR- the literal string "1.0" when the language is either "eagle"
  #       or "client".  The platform argument must be an empty string -OR-
  #       one of the literal strings "win32-arm", "win32-x86", "win64-arm64",
  #       "win64-ia64", or "win64-x64".  An empty string means that the
  #       associated package does not require a specific platform.  The
  #       fileNames argument must be a well-formed list of file names to
  #       download, each one relative to the language and version-specific
  #       directory on the package file server.  The options argument must
  #       be a dictionary of name/value pairs.  The -persistent option should
  #       be non-zero if the downloaded files should be saved to permanent
  #       storage for subsequent use.  The -usePgp option should be non-zero
  #       when an OpenPGP signature file needs to be downloaded and verified
  #       for each downloaded file.  The -useAutoPath option should be
  #       non-zero to modify the auto-path to include the temporary or
  #       persistent directories containing the downloaded files.  The
  #       -allowUpdate option should be non-zero to allow existing package
  #       files to be overwritten.
  #
  # <public>
  proc downloadFiles { language version platform fileNames options } {
    variable clientDirectory
    variable persistentRootDirectory
    variable temporaryRootDirectory
    variable viaInstall

    verifyLanguageAndVersion $language $version isClient
    verifyPlatform $platform platform

    set temporaryDirectory [file join \
        $temporaryRootDirectory [appendArgs \
        pkgd_lib_ [::PackageRepository::getUniqueSuffix]]]

    if {$isClient} then {
      set persistentDirectory $clientDirectory

      if {[file exists $downloadFileName]} then {
        error [appendArgs \
            "temporary file name \"" $downloadFileName \
            "\" already exists"]
      }

      file mkdir [file dirname $downloadFileName]

      downloadOneFile $language $version $platform \
          $fileName $downloadFileName $usePgp

      lappend downloadedFileNames [list \
          $fileNameOnly $directory(temporary) $directory(persistent)]

      if {$usePgp && \
          ![isOpenPgpSignatureFileName $downloadFileName true]} then {
        downloadOneFile $language $version $platform \
            [appendArgs $fileName .asc] \
            [appendArgs $downloadFileName .asc] $usePgp

        lappend downloadedFileNames [list \
            [appendArgs $fileNameOnly .asc] $directory(temporary) \
            $directory(persistent)]
      }
    }

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    THE ASSOCIATED SOFTWARE MAY NOT WORK PROPERLY IF THIS FILE IS ALTERED.
-->
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  <Vendor>Mistachkin Systems</Vendor>
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