Use CFX_WideString in CPDF_NameTree functions to strip BOMchromium/3162

PDFium doesn't strip BOMs during parsing, but we should strip BOMs when
retrieving parsed strings in CPDF_NameTree to ensure consistency and
appropriate function behavior. See the bug for more info.

As outlined in Bug=pdfium:593, the solution is to call GetUnicodeText()
instead of GetString(). I added a GetUnicodeTextAt() function in
CPDF_Array, which is symmetrical to GetUnicodeTextFor() in
CPDF_Dictionary.

I then changed the input variable types to CPDF_NameTree functions to
be CFX_WideString instead of CFX_ByteString, and modified all the
calls to them.

I also added a unit test for nametree, which would fail prior to this
change. Nametrees with non-unicode names are already tested by embedder
tests.

Bug=pdfium:820

Change-Id: Id69d7343632f83d1f5180348c0eea290f478183f
Reviewed-on: https://pdfium-review.googlesource.com/8091
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Jane Liu <janeliulwq@google.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/fpdfsdk/cpdfsdk_formfillenvironment.cpp b/fpdfsdk/cpdfsdk_formfillenvironment.cpp
index b0ee903ead..de7947556d 100644
--- a/fpdfsdk/cpdfsdk_formfillenvironment.cpp
+++ b/fpdfsdk/cpdfsdk_formfillenvironment.cpp
@@ -603,10 +603,9 @@ void CPDFSDK_FormFillEnvironment::ProcJavascriptFun() {
   CPDF_DocJSActions docJS(pPDFDoc);
   int iCount = docJS.CountJSActions();
   for (int i = 0; i < iCount; i++) {
-    CFX_ByteString csJSName;
+    CFX_WideString csJSName;
     CPDF_Action jsAction = docJS.GetJSActionAndName(i, &csJSName);
-    GetActionHandler()->DoAction_JavaScript(
-        jsAction, CFX_WideString::FromLocal(csJSName.AsStringC()), this);
+    GetActionHandler()->DoAction_JavaScript(jsAction, csJSName, this);
   }
 }