Add m-esr52 at 52.6.0

1 files changed, 145 insertions, 0 deletions

diff --git a/ipc/chromium/src/base/scoped_bstr_win.h b/ipc/chromium/src/base/scoped_bstr_win.h
new file mode 100644
index 000000000..86cfb0254
--- /dev/null
+++ b/ipc/chromium/src/base/scoped_bstr_win.h
@@ -0,0 +1,145 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// Copyright (c) 2006-2008 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.
+
+#ifndef BASE_SCOPED_BSTR_WIN_H_
+#define BASE_SCOPED_BSTR_WIN_H_
+
+#include "base/basictypes.h"  // needed to pick up OS_WIN
+
+#include "base/logging.h"
+
+#include <windows.h>
+#include <oleauto.h>
+
+// Manages a BSTR string pointer.
+// The class interface is based on scoped_ptr.
+class ScopedBstr {
+ public:
+  ScopedBstr() : bstr_(NULL) {
+  }
+
+  // Constructor to create a new BSTR.
+  // NOTE: Do not pass a BSTR to this constructor expecting ownership to
+  // be transferred - even though it compiles! ;-)
+  explicit ScopedBstr(const wchar_t* non_bstr);
+  ~ScopedBstr();
+
+  // Give ScopedBstr ownership over an already allocated BSTR or NULL.
+  // If you need to allocate a new BSTR instance, use |allocate| instead.
+  void Reset(BSTR bstr = NULL);
+
+  // Releases ownership of the BSTR to the caller.
+  BSTR Release();
+
+  // Creates a new BSTR from a wide string.
+  // If you already have a BSTR and want to transfer ownership to the
+  // ScopedBstr instance, call |reset| instead.
+  // Returns a pointer to the new BSTR, or NULL if allocation failed.
+  BSTR Allocate(const wchar_t* wide_str);
+
+  // Allocates a new BSTR with the specified number of bytes.
+  // Returns a pointer to the new BSTR, or NULL if allocation failed.
+  BSTR AllocateBytes(int bytes);
+
+  // Sets the allocated length field of the already-allocated BSTR to be
+  // |bytes|.  This is useful when the BSTR was preallocated with e.g.
+  // SysAllocStringLen or SysAllocStringByteLen (call |AllocateBytes|) and
+  // then not all the bytes are being used.
+  // Note that if you want to set the length to a specific number of characters,
+  // you need to multiply by sizeof(wchar_t).  Oddly, there's no public API to
+  // set the length, so we do this ourselves by hand.
+  //
+  // NOTE: The actual allocated size of the BSTR MUST be >= bytes.
+  //  That responsibility is with the caller.
+  void SetByteLen(uint32_t bytes);
+
+  // Swap values of two ScopedBstr's.
+  void Swap(ScopedBstr& bstr2);
+
+  // Retrieves the pointer address.
+  // Used to receive BSTRs as out arguments (and take ownership).
+  // The function DCHECKs on the current value being NULL.
+  // Usage: GetBstr(bstr.Receive());
+  BSTR* Receive();
+
+  // Returns number of chars in the BSTR.
+  uint32_t Length() const;
+
+  // Returns the number of bytes allocated for the BSTR.
+  uint32_t ByteLength() const;
+
+  operator BSTR() const {
+    return bstr_;
+  }
+
+ protected:
+  BSTR bstr_;
+
+ private:
+  // Forbid comparison of ScopedBstr types.  You should never have the same
+  // BSTR owned by two different scoped_ptrs.
+  bool operator==(const ScopedBstr& bstr2) const;
+  bool operator!=(const ScopedBstr& bstr2) const;
+  DISALLOW_COPY_AND_ASSIGN(ScopedBstr);
+};
+
+// Template class to generate a BSTR from a static wide string
+// without touching the heap.  Use this class via the StackBstrVar and
+// StackBstr macros.
+template <uint32_t string_bytes>
+class StackBstrT {
+ public:
+  // Try to stay as const as we can in an attempt to avoid someone
+  // using the class incorrectly (e.g. by supplying a variable instead
+  // of a verbatim string.  We also have an assert in the constructor
+  // as an extra runtime check since the const-ness only catches one case.
+  explicit StackBstrT(const wchar_t* const str) {
+    // The BSTR API uses UINT, but we prefer uint32_t.
+    // Make sure we'll know about it if these types don't match.
+    COMPILE_ASSERT(sizeof(uint32_t) == sizeof(UINT), UintToUint32);
+    COMPILE_ASSERT(sizeof(wchar_t) == sizeof(OLECHAR), WcharToOlechar);
+
+    // You shouldn't pass string pointers to this constructor since
+    // there's no way for the compiler to calculate the length of the
+    // string (string_bytes will be equal to pointer size in those cases).
+    DCHECK(lstrlenW(str) == (string_bytes / sizeof(bstr_.str_[0])) - 1) <<
+        "not expecting a string pointer";
+    memcpy(bstr_.str_, str, string_bytes);
+    bstr_.len_ = string_bytes - sizeof(wchar_t);
+  }
+
+  operator BSTR() {
+    return bstr_.str_;
+  }
+
+ protected:
+  struct BstrInternal {
+    uint32_t len_;
+    wchar_t str_[string_bytes / sizeof(wchar_t)];
+  } bstr_;
+};
+
+// Use this macro to generate an inline BSTR from a wide string.
+// This is about 6 times faster than using the SysAllocXxx functions to
+// allocate a BSTR and helps with keeping heap fragmentation down.
+// Example:
+//  DoBstrStuff(StackBstr(L"This is my BSTR"));
+// Where DoBstrStuff is:
+//  HRESULT DoBstrStuff(BSTR bstr) { ... }
+#define StackBstr(str) \
+  static_cast<BSTR>(StackBstrT<sizeof(str)>(str))
+
+// If you need a named BSTR variable that's based on a fixed string
+// (e.g. if the BSTR is used inside a loop or more than one place),
+// use StackBstrVar to declare a variable.
+// Example:
+//   StackBstrVar(L"my_property", myprop);
+//   for (int i = 0; i < objects.length(); ++i)
+//     ProcessValue(objects[i].GetProp(myprop));  // GetProp accepts BSTR
+#define StackBstrVar(str, var) \
+  StackBstrT<sizeof(str)> var(str)
+
+#endif  // BASE_SCOPED_BSTR_WIN_H_