Load pdf library on all platforms.

chrome/utility/chrome_content_utility_client.cc

Index: chrome/utility/chrome_content_utility_client.cc
diff --git a/chrome/utility/chrome_content_utility_client.cc b/chrome/utility/chrome_content_utility_client.cc
index 3cc0d30c792ce8bd9297edf6b23b1412c8eecf5d..7815f97a6314a60104d0d2925158ecdee9d77fae 100644
--- a/chrome/utility/chrome_content_utility_client.cc
+++ b/chrome/utility/chrome_content_utility_client.cc
@@ -7,12 +7,15 @@
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
+#include "base/scoped_native_library.h"
 #include "base/time/time.h"
+#include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_utility_messages.h"
 #include "chrome/common/extensions/chrome_extensions_client.h"
 #include "chrome/common/extensions/extension.h"
@@ -37,11 +40,8 @@
 #include "ui/gfx/size.h"
 
 #if defined(OS_WIN)
-#include "base/file_util.h"
-#include "base/path_service.h"
 #include "base/win/iat_patch_function.h"
 #include "base/win/scoped_handle.h"
-#include "chrome/common/chrome_paths.h"
 #include "chrome/utility/media_galleries/itunes_pref_parser_win.h"
 #include "printing/emf_win.h"
 #include "ui/gfx/gdi_util.h"
@@ -80,6 +80,210 @@ void ReleaseProcessIfNeeded() {
   content::UtilityThread::Get()->ReleaseProcessIfNeeded();
 }
 
+class PdfFunctionsBase {
+ public:
+  PdfFunctionsBase() : render_pdf_to_bitmap_func_(NULL) {}
+
+  bool Init() {
+    base::FilePath pdf_module_path;
+    if (!PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf_module_path) ||
+        !base::PathExists(pdf_module_path)) {
+      return false;
+    }
+
+    pdf_lib_.Reset(base::LoadNativeLibrary(pdf_module_path, NULL));
+    if (!pdf_lib_.is_valid()) {
+      LOG(WARNING) << "Couldn't load PDF plugin";
+      return false;
+    }
+
+    render_pdf_to_bitmap_func_ =
+        reinterpret_cast<RenderPDFPageToBitmapProc>(
+            pdf_lib_.GetFunctionPointer("RenderPDFPageToBitmap"));
+    LOG_IF(WARNING, !render_pdf_to_bitmap_func_) <<
+        "Missing RenderPDFPageToBitmap";
+
+    if (!render_pdf_to_bitmap_func_ || !PlatformInit(pdf_module_path, pdf_lib_))
+      Reset();
+
+    return IsValid();
+  }
+
+  bool IsValid() const {
+    return pdf_lib_.is_valid();
+  }
+
+  void Reset() {
+    pdf_lib_.Reset(NULL);
+  }
+
+  bool RenderPDFPageToBitmap(const unsigned char* pdf_buffer,
+                             int buffer_size,
+                             int page_number,
+                             unsigned char* bitmap_buffer,
+                             int bitmap_height,
+                             int bitmap_width,
+                             int dpi_x,
+                             int dpi_y,
+                             bool autorotate) {
+    if (!render_pdf_to_bitmap_func_)
+      return false;
+    return render_pdf_to_bitmap_func_(pdf_buffer, buffer_size, page_number,
+                                      bitmap_buffer, bitmap_height,
+                                      bitmap_width, dpi_x, dpi_y, autorotate);
+  }
+
+ protected:
+  virtual bool PlatformInit(
+      const base::FilePath& pdf_module_path,
+      const base::ScopedNativeLibrary& pdf_lib) {
+    return true;
+  };
+
+ private:
+  // Exported by PDF plugin.
+  typedef bool (*RenderPDFPageToBitmapProc)(const unsigned char* pdf_buffer,
+                                            int buffer_size,
+                                            int page_number,
+                                            unsigned char* bitmap_buffer,
+                                            int bitmap_height,
+                                            int bitmap_width,
+                                            int dpi_x,
+                                            int dpi_y,
+                                            bool autorotate);
+  RenderPDFPageToBitmapProc render_pdf_to_bitmap_func_;
+
+  base::ScopedNativeLibrary pdf_lib_;
+  DISALLOW_COPY_AND_ASSIGN(PdfFunctionsBase);
+};
+
+#if defined(OS_WIN)
+// The 2 below IAT patch functions are almost identical to the code in
+// render_process_impl.cc. This is needed to work around specific Windows APIs
+// used by the Chrome PDF plugin that will fail in the sandbox.
+static base::win::IATPatchFunction g_iat_patch_createdca;
+HDC WINAPI UtilityProcess_CreateDCAPatch(LPCSTR driver_name,
+                                         LPCSTR device_name,
+                                         LPCSTR output,
+                                         const DEVMODEA* init_data) {
+  if (driver_name && (std::string("DISPLAY") == driver_name)) {
+    // CreateDC fails behind the sandbox, but not CreateCompatibleDC.
+    return CreateCompatibleDC(NULL);
+  }
+
+  NOTREACHED();
+  return CreateDCA(driver_name, device_name, output, init_data);
+}
+
+static base::win::IATPatchFunction g_iat_patch_get_font_data;
+DWORD WINAPI UtilityProcess_GetFontDataPatch(
+    HDC hdc, DWORD table, DWORD offset, LPVOID buffer, DWORD length) {
+  int rv = GetFontData(hdc, table, offset, buffer, length);
+  if (rv == GDI_ERROR && hdc) {
+    HFONT font = static_cast<HFONT>(GetCurrentObject(hdc, OBJ_FONT));
+
+    LOGFONT logfont;
+    if (GetObject(font, sizeof(LOGFONT), &logfont)) {
+      content::UtilityThread::Get()->PreCacheFont(logfont);
+      rv = GetFontData(hdc, table, offset, buffer, length);
+      content::UtilityThread::Get()->ReleaseCachedFonts();
+    }
+  }
+  return rv;
+}
+
+class PdfFunctionsWin : public PdfFunctionsBase {
+ public:
+  PdfFunctionsWin() : render_pdf_to_dc_func_(NULL),
+                      get_pdf_doc_info_func_(NULL) {
+  }
+
+  bool PlatformInit(
+      const base::FilePath& pdf_module_path,
+      const base::ScopedNativeLibrary& pdf_lib) OVERRIDE {
+    // Patch the IAT for handling specific APIs known to fail in the sandbox.
+    if (!g_iat_patch_createdca.is_patched()) {
+      g_iat_patch_createdca.Patch(pdf_module_path.value().c_str(),
+                                  "gdi32.dll", "CreateDCA",
+                                  UtilityProcess_CreateDCAPatch);
+    }
+
+    if (!g_iat_patch_get_font_data.is_patched()) {
+      g_iat_patch_get_font_data.Patch(pdf_module_path.value().c_str(),
+                                      "gdi32.dll", "GetFontData",
+                                      UtilityProcess_GetFontDataPatch);
+    }
+    render_pdf_to_dc_func_ =
+      reinterpret_cast<RenderPDFPageToDCProc>(
+          pdf_lib.GetFunctionPointer("RenderPDFPageToDC"));
+    LOG_IF(WARNING, !render_pdf_to_dc_func_) << "Missing RenderPDFPageToDC";
+
+    get_pdf_doc_info_func_ =
+        reinterpret_cast<GetPDFDocInfoProc>(
+            pdf_lib.GetFunctionPointer("GetPDFDocInfo"));
+    LOG_IF(WARNING, !get_pdf_doc_info_func_) << "Missing GetPDFDocInfo";
+    return render_pdf_to_dc_func_ && get_pdf_doc_info_func_;
+  }
+
+  bool RenderPDFPageToDC(const unsigned char* pdf_buffer,
+                         int buffer_size,
+                         int page_number,
+                         HDC dc,
+                         int dpi_x,
+                         int dpi_y,
+                         int bounds_origin_x,
+                         int bounds_origin_y,
+                         int bounds_width,
+                         int bounds_height,
+                         bool fit_to_bounds,
+                         bool stretch_to_bounds,
+                         bool keep_aspect_ratio,
+                         bool center_in_bounds,
+                         bool autorotate) {
+    if (!render_pdf_to_dc_func_)
+      return false;
+    return render_pdf_to_dc_func_(pdf_buffer, buffer_size, page_number,
+                                  dc, dpi_x, dpi_y, bounds_origin_x,
+                                  bounds_origin_y, bounds_width, bounds_height,
+                                  fit_to_bounds, stretch_to_bounds,
+                                  keep_aspect_ratio, center_in_bounds,
+                                  autorotate);
+  }
+
+  bool GetPDFDocInfo(const unsigned char* pdf_buffer,
+                     int buffer_size,
+                     int* page_count,
+                     double* max_page_width) {
+    if (!get_pdf_doc_info_func_)
+      return false;
+    return get_pdf_doc_info_func_(pdf_buffer, buffer_size, page_count,
+                                  max_page_width);
+  }
+
+ private:
+  // Exported by PDF plugin.
+  typedef bool (*RenderPDFPageToDCProc)(
+      const unsigned char* pdf_buffer, int buffer_size, int page_number, HDC dc,
+      int dpi_x, int dpi_y, int bounds_origin_x, int bounds_origin_y,
+      int bounds_width, int bounds_height, bool fit_to_bounds,
+      bool stretch_to_bounds, bool keep_aspect_ratio, bool center_in_bounds,
+      bool autorotate);
+  typedef bool (*GetPDFDocInfoProc)(const unsigned char* pdf_buffer,
+                                    int buffer_size, int* page_count,
+                                    double* max_page_width);
+  RenderPDFPageToDCProc render_pdf_to_dc_func_;
+  GetPDFDocInfoProc get_pdf_doc_info_func_;
+
+  DISALLOW_COPY_AND_ASSIGN(PdfFunctionsWin);
+};
+
+typedef PdfFunctionsWin PdfFunctions;
+#else  // OS_WIN
+typedef PdfFunctionsBase PdfFunctions;
+#endif  // OS_WIN
+
+static base::LazyInstance<PdfFunctions> g_pdf_lib = LAZY_INSTANCE_INITIALIZER;
+
 }  // namespace
 
 ChromeContentUtilityClient::ChromeContentUtilityClient() {
@@ -99,17 +303,6 @@ ChromeContentUtilityClient::~ChromeContentUtilityClient() {
 }
 
 void ChromeContentUtilityClient::UtilityThreadStarted() {
-#if defined(OS_WIN)
-  // Load the pdf plugin before the sandbox is turned on. This is for Windows
-  // only because we need this DLL only on Windows.
-  base::FilePath pdf;
-  if (PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf) &&
-      base::PathExists(pdf)) {
-    bool rv = !!LoadLibrary(pdf.value().c_str());
-    DCHECK(rv) << "Couldn't load PDF plugin";
-  }
-#endif
-
   CommandLine* command_line = CommandLine::ForCurrentProcess();
   std::string lang = command_line->GetSwitchValueASCII(switches::kLang);
   if (!lang.empty())
@@ -182,6 +375,8 @@ void ChromeContentUtilityClient::PreSandboxStartup() {
   local_discovery::ServiceDiscoveryMessageHandler::PreSandboxStartup();
 #endif  // ENABLE_MDNS
 
+  g_pdf_lib.Get().Init();
+
   // Load media libraries for media file validation.
   base::FilePath media_path;
   PathService::Get(content::DIR_MEDIA_LIBS, &media_path);
@@ -332,51 +527,6 @@ void ChromeContentUtilityClient::OnRenderPDFPagesToMetafile(
 }
 
 #if defined(OS_WIN)
-// Exported by pdf.dll
-typedef bool (*RenderPDFPageToDCProc)(
-    const unsigned char* pdf_buffer, int buffer_size, int page_number, HDC dc,
-    int dpi_x, int dpi_y, int bounds_origin_x, int bounds_origin_y,
-    int bounds_width, int bounds_height, bool fit_to_bounds,
-    bool stretch_to_bounds, bool keep_aspect_ratio, bool center_in_bounds,
-    bool autorotate);
-
-typedef bool (*GetPDFDocInfoProc)(const unsigned char* pdf_buffer,
-                                  int buffer_size, int* page_count,
-                                  double* max_page_width);
-
-// The 2 below IAT patch functions are almost identical to the code in
-// render_process_impl.cc. This is needed to work around specific Windows APIs
-// used by the Chrome PDF plugin that will fail in the sandbox.
-static base::win::IATPatchFunction g_iat_patch_createdca;
-HDC WINAPI UtilityProcess_CreateDCAPatch(LPCSTR driver_name,
-                                         LPCSTR device_name,
-                                         LPCSTR output,
-                                         const DEVMODEA* init_data) {
-  if (driver_name &&
-      (std::string("DISPLAY") == std::string(driver_name)))
-  // CreateDC fails behind the sandbox, but not CreateCompatibleDC.
-    return CreateCompatibleDC(NULL);
-
-  NOTREACHED();
-  return CreateDCA(driver_name, device_name, output, init_data);
-}
-
-static base::win::IATPatchFunction g_iat_patch_get_font_data;
-DWORD WINAPI UtilityProcess_GetFontDataPatch(
-    HDC hdc, DWORD table, DWORD offset, LPVOID buffer, DWORD length) {
-  int rv = GetFontData(hdc, table, offset, buffer, length);
-  if (rv == GDI_ERROR && hdc) {
-    HFONT font = static_cast<HFONT>(GetCurrentObject(hdc, OBJ_FONT));
-
-    LOGFONT logfont;
-    if (GetObject(font, sizeof(LOGFONT), &logfont)) {
-      content::UtilityThread::Get()->PreCacheFont(logfont);
-      rv = GetFontData(hdc, table, offset, buffer, length);
-      content::UtilityThread::Get()->ReleaseCachedFonts();
-    }
-  }
-  return rv;
-}
 
 bool ChromeContentUtilityClient::RenderPDFToWinMetafile(
     base::PlatformFile pdf_file,
@@ -390,34 +540,10 @@ bool ChromeContentUtilityClient::RenderPDFToWinMetafile(
   *highest_rendered_page_number = -1;
   *scale_factor = 1.0;
   base::win::ScopedHandle file(pdf_file);
-  base::FilePath pdf_module_path;
-  PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf_module_path);
-  HMODULE pdf_module = GetModuleHandle(pdf_module_path.value().c_str());
-  if (!pdf_module)
-    return false;
 
-  RenderPDFPageToDCProc render_proc =
-      reinterpret_cast<RenderPDFPageToDCProc>(
-          GetProcAddress(pdf_module, "RenderPDFPageToDC"));
-  if (!render_proc)
+  if (!g_pdf_lib.Get().IsValid())
     return false;
 
-  GetPDFDocInfoProc get_info_proc = reinterpret_cast<GetPDFDocInfoProc>(
-          GetProcAddress(pdf_module, "GetPDFDocInfo"));
-  if (!get_info_proc)
-    return false;
-
-  // Patch the IAT for handling specific APIs known to fail in the sandbox.
-  if (!g_iat_patch_createdca.is_patched())
-    g_iat_patch_createdca.Patch(pdf_module_path.value().c_str(),
-                                "gdi32.dll", "CreateDCA",
-                                UtilityProcess_CreateDCAPatch);
-
-  if (!g_iat_patch_get_font_data.is_patched())
-    g_iat_patch_get_font_data.Patch(pdf_module_path.value().c_str(),
-                                    "gdi32.dll", "GetFontData",
-                                    UtilityProcess_GetFontDataPatch);
-
   // TODO(sanjeevr): Add a method to the PDF DLL that takes in a file handle
   // and a page range array. That way we don't need to read the entire PDF into
   // memory.
@@ -429,12 +555,15 @@ bool ChromeContentUtilityClient::RenderPDFToWinMetafile(
   buffer.resize(length);
   DWORD bytes_read = 0;
   if (!ReadFile(pdf_file, &buffer.front(), length, &bytes_read, NULL) ||
-      (bytes_read != length))
+      (bytes_read != length)) {
     return false;
+  }
 
   int total_page_count = 0;
-  if (!get_info_proc(&buffer.front(), buffer.size(), &total_page_count, NULL))
+  if (!g_pdf_lib.Get().GetPDFDocInfo(&buffer.front(), buffer.size(),
+                                     &total_page_count, NULL)) {
     return false;
+  }
 
   printing::Emf metafile;
   metafile.InitToFile(metafile_path);
@@ -459,14 +588,15 @@ bool ChromeContentUtilityClient::RenderPDFToWinMetafile(
       // The underlying metafile is of type Emf and ignores the arguments passed
       // to StartPage.
       metafile.StartPage(gfx::Size(), gfx::Rect(), 1);
-      if (render_proc(&buffer.front(), buffer.size(), page_number,
-                      metafile.context(), render_dpi, render_dpi,
-                      render_area.x(), render_area.y(), render_area.width(),
-                      render_area.height(), true, false, true, true,
-                      autorotate))
+      if (g_pdf_lib.Get().RenderPDFPageToDC(
+              &buffer.front(), buffer.size(), page_number, metafile.context(),
+              render_dpi, render_dpi, render_area.x(), render_area.y(),
+              render_area.width(), render_area.height(), true, false, true,
+              true, autorotate)) {
         if (*highest_rendered_page_number < page_number)
           *highest_rendered_page_number = page_number;
         ret = true;
+      }
       metafile.FinishPage();
     }
   }