Bug 1185236 - Add adjustPrintJobName in order to avoid IPP job name limit. r=karlt

MozReview-Commit-ID: n2k9lwfoyW

--HG--
extra : rebase_source : 0a9b2ee4235a4a1000abec15434fe1d37ecdab0d

gfx/thebes/PrintTarget.cpp

@@ -15,6 +15,13 @@
 #include "mozilla/gfx/2D.h"
 #include "mozilla/gfx/HelpersCairo.h"
 #include "mozilla/gfx/Logging.h"
+#include "nsReadableUtils.h"
+#include "nsString.h"
+#include "nsUTF8Utils.h"
+
+// IPP spec disallow the job-name which is over 255 characters.
+// RFC: https://tools.ietf.org/html/rfc2911#section-4.1.2
+#define IPP_JOB_NAME_LIMIT_LENGTH 255
 
 namespace mozilla {
 namespace gfx {
@@ -160,6 +167,22 @@ PrintTarget::GetReferenceDrawTarget(DrawEventRecorder* aRecorder)
   return do_AddRef(mRefDT);
 }
 
+/* static */
+void
+PrintTarget::AdjustPrintJobNameForIPP(const nsAString& aJobName,
+                                      nsCString& aAdjustedJobName)
+{
+  CopyUTF16toUTF8(aJobName, aAdjustedJobName);
+
+  if (aAdjustedJobName.Length() > IPP_JOB_NAME_LIMIT_LENGTH) {
+    uint32_t length =
+      RewindToPriorUTF8Codepoint(aAdjustedJobName.get(),
+                                 (IPP_JOB_NAME_LIMIT_LENGTH - 3U));
+    aAdjustedJobName.SetLength(length);
+    aAdjustedJobName.AppendLiteral("...");
+  }
+}
+
 /* static */ already_AddRefed<DrawTarget>
 PrintTarget::CreateWrapAndRecordDrawTarget(DrawEventRecorder* aRecorder,
                                        DrawTarget* aDrawTarget)

gfx/thebes/PrintTarget.h

@@ -136,6 +136,9 @@ public:
    */
   virtual already_AddRefed<DrawTarget> GetReferenceDrawTarget(DrawEventRecorder* aRecorder);
 
+  static void AdjustPrintJobNameForIPP(const nsAString& aJobName,
+                                       nsCString& aAdjustedJobName);
+
 protected:
 
   // Only created via subclass's constructors