bug 98092 r=db48x sr=bzbarsky [RFE] Show image file size in image property [properties] dialog

suite/browser/metadata.js

@@ -55,6 +55,15 @@ var onTable  = false;
 var onTitle  = false;
 var onLang   = false;
 
+const nsICacheService = Components.interfaces.nsICacheService;
+const cacheService = Components.classes["@mozilla.org/network/cache-service;1"]
+                     .getService(nsICacheService);
+var httpCacheSession = cacheService.createSession("HTTP", 0, true);
+httpCacheSession.doomEntriesIfExpired = false;
+var ftpCacheSession = cacheService.createSession("FTP", 0, true);
+ftpCacheSession.doomEntriesIfExpired = false;
+
+
 function onLoad()
 {
     gMetadataBundle = document.getElementById("bundle_metadata");
@@ -167,6 +176,13 @@ function checkForImage(elem, htmllocalname)
 
     if (img) {
         setInfo("image-url", img.src);
+
+        var size = getSize(img.src);
+        if (size != -1) {
+            var kbSize = size / 1024;
+            kbSize = Math.round(kbSize*100)/100;
+            setInfo("image-filesize", gMetadataBundle.getFormattedString("imageSize", [kbSize, size]));
+        }
         if ("width" in img) {
             setInfo("image-width", img.width);
             setInfo("image-height", img.height);
@@ -531,3 +547,22 @@ function convertLanguageCode(abbr)
 
     return result;
 }
+
+// Returns the size of the URL in bytes; must be cached and therefore an HTTP or FTP URL
+function getSize(url) {
+    try
+    {
+        var cacheEntryDescriptor = httpCacheSession.openCacheEntry(url, Components.interfaces.nsICache.ACCESS_READ, false);
+        if(cacheEntryDescriptor)
+          return cacheEntryDescriptor.dataSize;
+    }
+    catch(ex) {}
+    try
+    {
+        cacheEntryDescriptor = ftpCacheSession.openCacheEntry(url, Components.interfaces.nsICache.ACCESS_READ, false);
+        if (cacheEntryDescriptor)
+            return cacheEntryDescriptor.dataSize;
+    }
+    catch(ex) {}
+    return -1;
+}

suite/browser/metadata.xul

@@ -137,6 +137,10 @@
             <spacer flex="1"/>
           </hbox>
         </row>
+	<row id="image-filesize">
+	  <label value="&image-filesize.label; "/>
+	  <label id="image-filesize-text" value="&filesize-unknown.label;"/>
+	</row>
       </rows>
     </grid>
   </groupbox>

suite/locales/en-US/chrome/browser/metadata.dtd

@@ -7,6 +7,8 @@
 <!ENTITY image-width.label     "Width:">
 <!ENTITY image-height.label    "Height:">
 <!ENTITY image-pixels.label    "pixels">
+<!ENTITY image-filesize.label  "Size of File:">
+<!ENTITY filesize-unknown.label "Unknown (not cached)">
 <!ENTITY insdel-sec.label      "Insert/Delete Properties">
 <!ENTITY insdel-cite.label     "Info:">
 <!ENTITY insdel-date.label     "Date:">

suite/locales/en-US/chrome/browser/metadata.properties

@@ -4,3 +4,5 @@ parentFrameText=Parent frame
 sameFrameText=Same frame
 embeddedText=Embedded
 unableToShowProps=No properties available.
+
+imageSize=%S KB (%S bytes)