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| author | slightlyoff@chromium.org <slightlyoff@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2009-09-24 05:11:58 +0000 |
|---|---|---|
| committer | slightlyoff@chromium.org <slightlyoff@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2009-09-24 05:11:58 +0000 |
| commit | f781782dd67077478e117c61dca4ea5eefce3544 (patch) | |
| tree | 4801f724123cfdcbb69c4e7fe40a565b331723ae /chrome_frame/chrome_launcher_main.cc | |
| parent | 63cf4759efa2373e33436fb5df6849f930081226 (diff) | |
| download | chromium_src-f781782dd67077478e117c61dca4ea5eefce3544.zip chromium_src-f781782dd67077478e117c61dca4ea5eefce3544.tar.gz chromium_src-f781782dd67077478e117c61dca4ea5eefce3544.tar.bz2 | |
Initial import of the Chrome Frame codebase. Integration in chrome.gyp coming in a separate CL.
BUG=None
TEST=None
Review URL: http://codereview.chromium.org/218019
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27042 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'chrome_frame/chrome_launcher_main.cc')
| -rw-r--r-- | chrome_frame/chrome_launcher_main.cc | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/chrome_frame/chrome_launcher_main.cc b/chrome_frame/chrome_launcher_main.cc new file mode 100644 index 0000000..5347f5a --- /dev/null +++ b/chrome_frame/chrome_launcher_main.cc @@ -0,0 +1,79 @@ +// Copyright (c) 2009 The Chromium 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 <windows.h>
+
+#include "chrome_frame/chrome_launcher.h"
+
+// We want to keep this EXE tiny, so we avoid all dependencies and link to no
+// libraries, and we do not use the C runtime.
+//
+// To catch errors in debug builds, we define an extremely simple assert macro.
+#ifndef NDEBUG
+#define CLM_ASSERT(x) do { if (!(x)) { ::DebugBreak(); } } while (false)
+#else
+#define CLM_ASSERT(x)
+#endif // NDEBUG
+
+// In release builds, we skip the standard library completely to minimize
+// size. This is more work in debug builds, and unnecessary, hence the
+// different signatures.
+#ifndef NDEBUG
+int APIENTRY wWinMain(HINSTANCE, HINSTANCE, wchar_t*, int) {
+#else
+extern "C" void __cdecl WinMainCRTStartup() {
+#endif // NDEBUG
+ // This relies on the chrome_launcher.exe residing in the same directory
+ // as our DLL. We build a full path to avoid loading it from any other
+ // directory in the DLL search path.
+ //
+ // The code is a bit verbose because we can't use the standard library.
+ const wchar_t kBaseName[] = L"npchrome_tab.dll";
+ wchar_t file_path[MAX_PATH + (sizeof(kBaseName) / sizeof(kBaseName[0])) + 1];
+ file_path[0] = L'\0';
+ ::GetModuleFileName(::GetModuleHandle(NULL), file_path, MAX_PATH);
+
+ // Find index of last slash, and null-terminate the string after it.
+ //
+ // Proof for security purposes, since we can't use the safe string
+ // manipulation functions from the runtime:
+ // - File_path is always null-terminated, by us initially and by
+ // ::GetModuleFileName if it puts anything into the buffer.
+ // - If there is no slash in the path then it's a relative path, not an
+ // absolute one, and the code ends up creating a relative path to
+ // npchrome_tab.dll.
+ // - It's safe to use lstrcatW since we know the maximum length of both
+ // parts we are concatenating, and we know the buffer will fit them in
+ // the worst case.
+ int slash_index = lstrlenW(file_path);
+ // Invariant: 0 <= slash_index < MAX_PATH
+ CLM_ASSERT(slash_index > 0);
+ while (slash_index > 0 && file_path[slash_index] != L'\\')
+ --slash_index;
+ // Invariant: 0 <= slash_index < MAX_PATH and it is either the index of
+ // the last \ in the path, or 0.
+ if (slash_index != 0)
+ ++slash_index; // don't remove the last '\'
+ file_path[slash_index] = L'\0';
+
+ lstrcatW(file_path, kBaseName);
+
+ UINT exit_code = ERROR_FILE_NOT_FOUND;
+ HMODULE chrome_tab = ::LoadLibrary(file_path);
+ CLM_ASSERT(chrome_tab);
+ if (chrome_tab) {
+ chrome_launcher::CfLaunchChromeProc proc =
+ reinterpret_cast<chrome_launcher::CfLaunchChromeProc>(
+ ::GetProcAddress(chrome_tab, "CfLaunchChrome"));
+ CLM_ASSERT(proc);
+ if (proc) {
+ exit_code = proc();
+ } else {
+ exit_code = ERROR_INVALID_FUNCTION;
+ }
+
+ ::FreeLibrary(chrome_tab);
+ }
+ ::ExitProcess(exit_code);
+}
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