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To Artifact [ad6530f32d]:


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		}
		append retval "[string range $hash [expr {$idx * 2}] end]"

		return $retval
	}

	proc _cachefile {url key {keyIsHash 1}} {
		set filekey $key
		if {$keyIsHash} {
			set key [_hash_sep $key]
			set filekey [_hash_sep $filekey]
		}

		set file [file join $::appfs::cachedir $key]
		set file [file join $::appfs::cachedir $filekey]

		file mkdir [file dirname $file]

		if {![file exists $file]} {
			set tmpfile "${file}.new"

			set fd [open $tmpfile "w"]
			fconfigure $fd -translation binary

			set token [::http::geturl $url -channel $fd -binary true]
			set ncode [::http::ncode $token]
			::http::reset $token
			close $fd

			if {$keyIsHash} {
				catch {
					set hash [string tolower [exec openssl sha1 $tmpfile]]
					regsub {.*= *} $hash {} hash
				}
			} else {
				set hash $key
			}

			if {$ncode == "200"} {
			if {$ncode == "200" && $hash == $key} {
				file rename -force -- $tmpfile $file
			} else {
				file delete -force -- $tmpfile
			}
		}

		return $file