Import XULRunner and make it produce the generic stub

application/xulrunner/tools/redit/Makefile.in

@@ -0,0 +1,11 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+ifeq ($(OS_ARCH),WINNT)
+
+SDK_BINARY =  \
+	$(PROGRAM) \
+	$(NULL)
+
+endif

application/xulrunner/tools/redit/moz.build

@@ -0,0 +1,15 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+if CONFIG['OS_ARCH'] == 'WINNT':
+    GeckoProgram('redit')
+    SOURCES += [
+        'redit.cpp',
+    ]
+    for var in ('WIN32_LEAN_AND_MEAN', 'UNICODE', '_UNICODE'):
+        DEFINES[var] = True
+    if CONFIG['GNU_CC']:
+        WIN32_EXE_LDFLAGS += ['-municode']

application/xulrunner/tools/redit/redit.cpp

@@ -0,0 +1,187 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// System headers (alphabetical)
+#include <fcntl.h>
+#include <io.h>
+#include <share.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <windows.h>
+
+// Mozilla headers (alphabetical)
+#include "mozilla/FileUtils.h"  // ScopedClose
+#include "mozilla/UniquePtrExtensions.h"
+
+/*
+Icon files are made up of:
+
+IconHeader
+IconDirEntry1
+IconDirEntry2
+...
+IconDirEntryN
+IconData1
+IconData2
+...
+IconDataN
+
+Each IconData must be added as a new RT_ICON resource to the exe. Then
+an RT_GROUP_ICON resource must be added that contains an equivalent
+header:
+
+IconHeader
+IconResEntry1
+IconResEntry2
+...
+IconResEntryN
+*/
+
+#pragma pack(push, 2)
+typedef struct
+{
+  WORD Reserved;
+  WORD ResourceType;
+  WORD ImageCount;
+} IconHeader;
+
+typedef struct
+{
+  BYTE Width;
+  BYTE Height;
+  BYTE Colors;
+  BYTE Reserved;
+  WORD Planes;
+  WORD BitsPerPixel;
+  DWORD ImageSize;
+  DWORD ImageOffset;
+} IconDirEntry;
+
+typedef struct
+{
+  BYTE Width;
+  BYTE Height;
+  BYTE Colors;
+  BYTE Reserved;
+  WORD Planes;
+  WORD BitsPerPixel;
+  DWORD ImageSize;
+  WORD ResourceID;    // This field is the one difference to above
+} IconResEntry;
+#pragma pack(pop)
+
+namespace {
+  /**
+   * ScopedResourceUpdate is a RAII wrapper for Windows resource updating
+   *
+   * Instances |EndUpdateResourceW()| their handles when they go out of scope.
+   * They pass |TRUE| as the second argument to |EndUpdateResourceW()|, which
+   * causes the resource update to be aborted (changes are discarded).
+   */
+  struct ScopedResourceUpdateTraits
+  {
+    typedef HANDLE type;
+    static type empty() { return nullptr; }
+    static void release(type handle) {
+      if(nullptr != handle) {
+        EndUpdateResourceW(handle, TRUE); // Discard changes
+      }
+    }
+  };
+
+  typedef mozilla::Scoped<ScopedResourceUpdateTraits> ScopedResourceUpdate;
+};
+
+#ifdef __MINGW32__
+extern "C"
+#endif
+int
+wmain(int argc, wchar_t** argv)
+{
+  if (argc != 3) {
+    printf("Usage: redit <exe file> <icon file>\n");
+    return 1;
+  }
+
+  mozilla::ScopedClose file;
+  if (0 != _wsopen_s(&file.rwget(),
+                     argv[2],
+                     _O_BINARY | _O_RDONLY,
+                     _SH_DENYWR,
+                     _S_IREAD)
+  || (-1 == file)) {
+    fprintf(stderr, "Unable to open icon file.\n");
+    return 1;
+  }
+
+  // Load all the data from the icon file
+  long filesize = _filelength(file);
+  auto data = MakeUniqueFallible<BYTE[]>(filesize);
+  if(!data) {
+    fprintf(stderr, "Failed to allocate memory for icon file.\n");
+    return 1;
+  }
+  _read(file, data.get(), filesize);
+
+  IconHeader* header = reinterpret_cast<IconHeader*>(data.get());
+
+  // Open the target library for updating
+  ScopedResourceUpdate updateRes(BeginUpdateResourceW(argv[1], FALSE));
+  if (nullptr == updateRes) {
+    fprintf(stderr, "Unable to open library for modification.\n");
+    return 1;
+  }
+
+  // Allocate the group resource entry
+  long groupSize = sizeof(IconHeader)
+                 + header->ImageCount * sizeof(IconResEntry);
+  auto group = MakeUniqueFallible<BYTE[]>(groupSize);
+  if(!group) {
+    fprintf(stderr, "Failed to allocate memory for new images.\n");
+    return 1;
+  }
+  memcpy(group.get(), data.get(), sizeof(IconHeader));
+
+  IconDirEntry* sourceIcon =
+                    reinterpret_cast<IconDirEntry*>(data.get()
+                                                  + sizeof(IconHeader));
+  IconResEntry* targetIcon =
+                    reinterpret_cast<IconResEntry*>(group.get()
+                                                  + sizeof(IconHeader));
+
+  for (int id = 1; id <= header->ImageCount; id++) {
+    // Add the individual icon
+    if (!UpdateResourceW(updateRes, RT_ICON, MAKEINTRESOURCE(id),
+                         MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
+                         data + sourceIcon->ImageOffset,
+                         sourceIcon->ImageSize)) {
+      fprintf(stderr, "Unable to update resource (RT_ICON).\n");
+      return 1;
+    }
+    // Copy the data for this icon
+    // (note that the structs have different sizes)
+    memcpy(targetIcon, sourceIcon, sizeof(IconResEntry));
+    targetIcon->ResourceID = id;
+    sourceIcon++;
+    targetIcon++;
+  }
+
+  if (!UpdateResourceW(updateRes, RT_GROUP_ICON, L"MAINICON",
+                       MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
+                       group, groupSize)) {
+    fprintf(stderr, "Unable to update resource (RT_GROUP_ICON).\n");
+    return 1;
+  }
+
+  // Save the modifications
+  if(!EndUpdateResourceW(updateRes.forget(), FALSE)) {
+    fprintf(stderr, "Unable to write changes to library.\n");
+    return 1;
+  }
+
+  return 0;
+}