The 515 MegaPR early downport (#7783)

Co-authored-by: Selis <selis@xynolabs.com>
Co-authored-by: Selis <sirlionfur@hotmail.de>
Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>
Co-authored-by: SatinIsle <thesatinisle@gmail.com>
Co-authored-by: Heroman <alesha3000@list.ru>
Co-authored-by: Casey <a.roaming.shadow@gmail.com>
Co-authored-by: Raeschen <rycoop29@gmail.com>

code/modules/asset_cache/asset_cache_item.dm

@@ -1,23 +1,54 @@
 /**
-	* # asset_cache_item
-	* 
-	* An internal datum containing info on items in the asset cache. Mainly used to cache md5 info for speed.
-**/
+ * # asset_cache_item
+ *
+ * An internal datum containing info on items in the asset cache. Mainly used to cache md5 info for speed.
+ */
 /datum/asset_cache_item
+	/// the name of this asset item, becomes the key in SSassets.cache list
 	var/name
-	var/url
-	var/md5
+	/// md5() of the file this asset item represents.
+	var/hash
+	/// the file this asset represents
 	var/resource
+	/// our file extension e.g. .png, .gif, etc
+	var/ext = ""
+	/// Should this file also be sent via the legacy browse_rsc system
+	/// when cdn transports are enabled?
+	var/legacy = FALSE
+	/// Used by the cdn system to keep legacy css assets with their parent
+	/// css file. (css files resolve urls relative to the css file, so the
+	/// legacy system can't be used if the css file itself could go out over
+	/// the cdn)
+	var/namespace = null
+	/// True if this is the parent css or html file for an asset's namespace
+	var/namespace_parent = FALSE
+	/// TRUE for keeping local asset names when browse_rsc backend is used
+	var/keep_local_name = FALSE
 
-/datum/asset_cache_item/New(name, file)
+///pass in a valid file_hash if you have one to save it from needing to do it again.
+///pass in a valid dmi file path string e.g. "icons/path/to/dmi_file.dmi" to make generating the hash less expensive
+/datum/asset_cache_item/New(name, file, file_hash, dmi_file_path)
 	if (!isfile(file))
 		file = fcopy_rsc(file)
-	md5 = md5(file)
-	if (!md5)
-		md5 = md5(fcopy_rsc(file))
-		if (!md5)
-			CRASH("invalid asset sent to asset cache")
-		log_world("asset cache unexpected success of second fcopy_rsc")
+
+	hash = file_hash
+
+	//the given file is directly from a dmi file and is thus in the rsc already, we know that its file_hash will be correct
+	if(!hash)
+		if(dmi_file_path)
+			hash = md5(file)
+		else
+			hash = md5asfile(file) //icons sent to the rsc md5 incorrectly when theyre given incorrect data
+	if (!hash)
+		CRASH("invalid asset sent to asset cache")
 	src.name = name
-	url = name
+	var/extstart = findlasttext(name, ".")
+	if (extstart)
+		ext = ".[copytext(name, extstart+1)]"
 	resource = file
+
+/datum/asset_cache_item/vv_edit_var(var_name, var_value)
+	return FALSE
+
+/datum/asset_cache_item/CanProcCall(procname)
+	return FALSE