Cleanup page when unloading in embedder tests

testing/embedder_test.cpp

 // Copyright 2015 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 "testing/embedder_test.h"
 
 #include <limits.h>
 
 #include <list>
 #include <string>
@@ skipping 237 matching lines @@
     return it->second;
 
   FPDF_PAGE page = FPDF_LoadPage(document_, page_number);
   if (!page) {
     return nullptr;
   }
   FORM_OnAfterLoadPage(page, form_handle_);
   FORM_DoPageAAction(page, form_handle_, FPDFPAGE_AACTION_OPEN);
   // Cache the page.
   page_map_[page_number] = page;
+  page_reverse_map_[page] = page_number;
   return page;
 }
 
 FPDF_BITMAP EmbedderTest::RenderPage(FPDF_PAGE page) {
   int width = static_cast<int>(FPDF_GetPageWidth(page));
   int height = static_cast<int>(FPDF_GetPageHeight(page));
   int alpha = FPDFPage_HasTransparency(page) ? 1 : 0;
   FPDF_BITMAP bitmap = FPDFBitmap_Create(width, height, alpha);
   FPDF_DWORD fill_color = alpha ? 0x00000000 : 0xFFFFFFFF;
   FPDFBitmap_FillRect(bitmap, 0, 0, width, height, fill_color);
   FPDF_RenderPageBitmap(bitmap, page, 0, 0, width, height, 0, 0);
   FPDF_FFLDraw(form_handle_, bitmap, page, 0, 0, width, height, 0, 0);
   return bitmap;
 }
 
 void EmbedderTest::UnloadPage(FPDF_PAGE page) {
   FORM_DoPageAAction(page, form_handle_, FPDFPAGE_AACTION_CLOSE);
   FORM_OnBeforeClosePage(page, form_handle_);
   FPDF_ClosePage(page);
+
+  auto it = page_reverse_map_.find(page);
+  if (it == page_reverse_map_.end())
+    return;
+
+  page_map_.erase(it->second);
+  page_reverse_map_.erase(it);
 }
 
 FPDF_PAGE EmbedderTest::Delegate::GetPage(FPDF_FORMFILLINFO* info,
                                           FPDF_DOCUMENT document,
                                           int page_index) {
   EmbedderTest* test = static_cast<EmbedderTest*>(info);
   auto it = test->page_map_.find(page_index);
   return it != test->page_map_.end() ? it->second : nullptr;
 }
 
@@ skipping 48 matching lines @@
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
   if (g_v8_natives)
     free(const_cast<char*>(g_v8_natives->data));
   if (g_v8_snapshot)
     free(const_cast<char*>(g_v8_snapshot->data));
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
 #endif  // PDF_ENABLE_V8
 
   return ret_val;
 }