Merge to XFA: Make FPDF_WIDESTRING work regardless of endianness.

Original Review URL: https://codereview.chromium.org/1554363002 .
(cherry picked from commit ed34cdf99d5a4b33e57f81f9244a311f6fb86db3)

TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1559373002 .

3 files changed, 21 insertions, 4 deletions

diff --git a/testing/embedder_test_timer_handling_delegate.h b/testing/embedder_test_timer_handling_delegate.h
index 74e346e830..a704bd49df 100644
--- a/testing/embedder_test_timer_handling_delegate.h
+++ b/testing/embedder_test_timer_handling_delegate.h
@@ -21,8 +21,8 @@ class EmbedderTestTimerHandlingDelegate : public EmbedderTest::Delegate {
                   int type_in,
                   int icon_in)
         : type(type_in), icon(icon_in) {
-      message = GetWideString(message_in);
-      title = GetWideString(title_in);
+      message = GetPlatformWString(message_in);
+      title = GetPlatformWString(title_in);
     }
 
     std::wstring message;
diff --git a/testing/test_support.cpp b/testing/test_support.cpp
index f71f6f8b4f..c7ab10ee3c 100644
--- a/testing/test_support.cpp
+++ b/testing/test_support.cpp
@@ -98,7 +98,7 @@ char* GetFileContents(const char* filename, size_t* retlen) {
   return buffer;
 }
 
-std::wstring GetWideString(FPDF_WIDESTRING wstr) {
+std::wstring GetPlatformWString(FPDF_WIDESTRING wstr) {
   if (!wstr)
     return nullptr;
 
@@ -114,6 +114,19 @@ std::wstring GetWideString(FPDF_WIDESTRING wstr) {
   return platform_string;
 }
 
+FPDF_WIDESTRING GetFPDFWideString(const std::wstring& wstr) {
+  size_t length = sizeof(uint16_t) * (wstr.length() + 1);
+  unsigned char* ptr = static_cast<unsigned char*>(malloc(length));
+  size_t i = 0;
+  for (wchar_t w : wstr) {
+    ptr[i++] = w & 0xff;
+    ptr[i++] = (w >> 8) & 0xff;
+  }
+  ptr[i++] = 0;
+  ptr[i] = 0;
+  return reinterpret_cast<FPDF_WIDESTRING>(ptr);
+}
+
 #ifdef PDF_ENABLE_V8
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 bool InitializeV8ForPDFium(const std::string& exe_path,
diff --git a/testing/test_support.h b/testing/test_support.h
index a2241144a4..d48d5596f4 100644
--- a/testing/test_support.h
+++ b/testing/test_support.h
@@ -19,7 +19,11 @@ char* GetFileContents(const char* filename, size_t* retlen);
 
 // Converts a FPDF_WIDESTRING to a std::wstring.
 // Deals with differences between UTF16LE and wchar_t.
-std::wstring GetWideString(FPDF_WIDESTRING wstr);
+std::wstring GetPlatformWString(const FPDF_WIDESTRING wstr);
+
+// Returns a newly mallocated FPDF_WIDESTRING (caller must free()).
+// Deals with differences between UTF16LE and wchar_t.
+FPDF_WIDESTRING GetFPDFWideString(const std::wstring& wstr);
 
 #ifdef PDF_ENABLE_V8
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA