Protect against unexpected library create/destroy

Probably won't fix bug 669797 on its own, but nice to have.
Remove unimplemented static method.

Review-Url: https://codereview.chromium.org/2543833002

4 files changed, 31 insertions, 3 deletions

diff --git a/BUILD.gn b/BUILD.gn
index 46768fc1a1..87368e2b56 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1734,6 +1734,7 @@ test("pdfium_unittests") {
     "core/fxge/dib/fx_dib_engine_unittest.cpp",
     "fpdfsdk/fpdfdoc_unittest.cpp",
     "fpdfsdk/fpdfeditimg_unittest.cpp",
+    "fpdfsdk/fpdfview_unittest.cpp",
   ]
   deps = [
     ":pdfium",
diff --git a/core/fpdfapi/cpdf_modulemgr.h b/core/fpdfapi/cpdf_modulemgr.h
index 57c266619e..d31ffd5256 100644
--- a/core/fpdfapi/cpdf_modulemgr.h
+++ b/core/fpdfapi/cpdf_modulemgr.h
@@ -35,7 +35,6 @@ class CFSDK_UnsupportInfo_Adapter {
 class CPDF_ModuleMgr {
  public:
   static CPDF_ModuleMgr* Get();
-  static void Create();
   static void Destroy();
   static const int kFileBufSize = 512;
 
diff --git a/fpdfsdk/fpdfview.cpp b/fpdfsdk/fpdfview.cpp
index 1c27b6c69b..633cbe879e 100644
--- a/fpdfsdk/fpdfview.cpp
+++ b/fpdfsdk/fpdfview.cpp
@@ -50,6 +50,9 @@
 
 namespace {
 
+// Also indicates whether library is currently initialized.
+CCodec_ModuleMgr* g_pCodecModule = nullptr;
+
 void RenderPageImpl(CPDF_PageRenderContext* pContext,
                     CPDF_Page* pPage,
                     const CFX_Matrix& matrix,
@@ -295,18 +298,20 @@ FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy) {
   }
 }
 
-CCodec_ModuleMgr* g_pCodecModule = nullptr;
-
 DLLEXPORT void STDCALL FPDF_InitLibrary() {
   FPDF_InitLibraryWithConfig(nullptr);
 }
 
 DLLEXPORT void STDCALL
 FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* cfg) {
+  if (g_pCodecModule)
+    return;
+
   g_pCodecModule = new CCodec_ModuleMgr();
 
   CFX_GEModule* pModule = CFX_GEModule::Get();
   pModule->Init(cfg ? cfg->m_pUserFontPaths : nullptr, g_pCodecModule);
+
   CPDF_ModuleMgr* pModuleMgr = CPDF_ModuleMgr::Get();
   pModuleMgr->SetCodecModule(g_pCodecModule);
   pModuleMgr->InitPageModule();
@@ -324,6 +329,9 @@ FPDF_InitLibraryWithConfig(const FPDF_LIBRARY_CONFIG* cfg) {
 }
 
 DLLEXPORT void STDCALL FPDF_DestroyLibrary() {
+  if (!g_pCodecModule)
+    return;
+
 #ifdef PDF_ENABLE_XFA
   BC_Library_Destory();
   FXJSE_Finalize();
diff --git a/fpdfsdk/fpdfview_unittest.cpp b/fpdfsdk/fpdfview_unittest.cpp
new file mode 100644
index 0000000000..27680b3d4e
--- /dev/null
+++ b/fpdfsdk/fpdfview_unittest.cpp
@@ -0,0 +1,20 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "public/fpdfview.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/test_support.h"
+
+TEST(FPDFView, DoubleInit) {
+  FPDF_InitLibrary();
+  FPDF_InitLibrary();
+  FPDF_DestroyLibrary();
+}
+
+TEST(FPDFView, DoubleDestroy) {
+  FPDF_InitLibrary();
+  FPDF_DestroyLibrary();
+  FPDF_DestroyLibrary();
+}