1 files changed, 150 insertions, 0 deletions
diff --git a/other-licenses/nsis/Contrib/PinToTaskbar/PinToTaskbar.cpp b/other-licenses/nsis/Contrib/PinToTaskbar/PinToTaskbar.cpp
new file mode 100644
index 0000000000..c891680549
--- /dev/null
+++ b/other-licenses/nsis/Contrib/PinToTaskbar/PinToTaskbar.cpp
@@ -0,0 +1,150 @@
+/* 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/. */
+
+// This file is an NSIS plugin which exports a function that pins a provided
+// Shortcut to the Windows Taskbar on Windows 10 (1903+) and Windows 11.
+// This is an adapted version of the Pin to Taskbar code that is used in
+// Firefox: https://searchfox.org/mozilla-central/rev/4bce7d85ba4796dd03c5dcc7cfe8eee0e4c07b3b/browser/components/shell/nsWindowsShellService.cpp#1178
+
+#include <objbase.h>
+#include <shlobj.h>
+
+#pragma comment(lib, "shlwapi.lib")
+
+static bool
+PinShortcutToTaskbar(const wchar_t *shortcutPath)
+{
+  // This enum is likely only used for Windows telemetry, INT_MAX is chosen to
+  // avoid confusion with existing uses.
+  enum PINNEDLISTMODIFYCALLER { PLMC_INT_MAX = INT_MAX };
+
+  // The types below, and the idea of using IPinnedList3::Modify,
+  // are thanks to Gee Law <https://geelaw.blog/entries/msedge-pins/>
+  static constexpr GUID CLSID_TaskbandPin = {
+      0x90aa3a4e,
+      0x1cba,
+      0x4233,
+      {0xb8, 0xbb, 0x53, 0x57, 0x73, 0xd4, 0x84, 0x49}};
+
+  static constexpr GUID IID_IPinnedList3 = {
+      0x0dd79ae2,
+      0xd156,
+      0x45d4,
+      {0x9e, 0xeb, 0x3b, 0x54, 0x97, 0x69, 0xe9, 0x40}};
+
+  struct IPinnedList3Vtbl;
+  struct IPinnedList3 {
+    IPinnedList3Vtbl* vtbl;
+  };
+
+  typedef ULONG STDMETHODCALLTYPE ReleaseFunc(IPinnedList3 * that);
+  typedef HRESULT STDMETHODCALLTYPE ModifyFunc(
+      IPinnedList3 * that, PCIDLIST_ABSOLUTE unpin, PCIDLIST_ABSOLUTE pin,
+      PINNEDLISTMODIFYCALLER caller);
+
+  struct IPinnedList3Vtbl {
+    void* QueryInterface;  // 0
+    void* AddRef;          // 1
+    ReleaseFunc* Release;  // 2
+    void* Other[13];       // 3-15
+    ModifyFunc* Modify;    // 16
+  };
+
+  PIDLIST_ABSOLUTE path = nullptr;
+  HRESULT hr = SHParseDisplayName(shortcutPath, nullptr, &path, 0, nullptr);
+  if (FAILED(hr) || !path) {
+    return false;
+  }
+
+  IPinnedList3* pinnedList = nullptr;
+  hr = CoCreateInstance(CLSID_TaskbandPin, nullptr, CLSCTX_INPROC_SERVER,
+                        IID_IPinnedList3, (void**)&pinnedList);
+  if (FAILED(hr) || !pinnedList) {
+    return false;
+  }
+
+  hr = pinnedList->vtbl->Modify(pinnedList, nullptr, path, PLMC_INT_MAX);
+
+  pinnedList->vtbl->Release(pinnedList);
+  CoTaskMemFree(path);
+  return true;
+}
+
+struct stack_t {
+  stack_t* next;
+  TCHAR text[MAX_PATH];
+};
+
+/**
+ * Removes an element from the top of the NSIS stack
+ *
+ * @param  stacktop A pointer to the top of the stack
+ * @param  str      The string to pop to
+ * @param  len      The max length
+ * @return 0 on success
+ */
+int
+popstring(stack_t **stacktop, TCHAR *str, int len)
+{
+  // Removes the element from the top of the stack and puts it in the buffer
+  stack_t *th;
+  if (!stacktop || !*stacktop) {
+    return 1;
+  }
+
+  th = (*stacktop);
+  lstrcpyn(str, th->text, len);
+  *stacktop = th->next;
+  HeapFree(GetProcessHeap(), 0, th);
+  return 0;
+}
+
+/**
+ * Adds an element to the top of the NSIS stack
+ *
+ * @param  stacktop A pointer to the top of the stack
+ * @param  str      The string to push on the stack
+ * @param  len      The length of the string to push on the stack
+ * @return 0 on success
+ */
+void
+pushstring(stack_t **stacktop, const TCHAR *str, int len)
+{
+  stack_t *th;
+  if (!stacktop) {
+    return;
+  }
+  th = (stack_t*)HeapAlloc(GetProcessHeap(), 0, sizeof(stack_t) + len);
+  lstrcpyn(th->text, str, len);
+  th->next = *stacktop;
+  *stacktop = th;
+}
+
+/**
+* Pins a provided shortcut to the Taskbar on Windows 10 (1903) and up.
+*
+* @param  stacktop  Pointer to the top of the stack, AKA the first parameter to
+                    the plugin call. Should contain the shortcut to pin.
+* @return 1 if the shortcut was pinned successfully, otherwise 0
+*/
+extern "C" void __declspec(dllexport)
+Pin(HWND, int, TCHAR *, stack_t **stacktop, void *)
+{
+  wchar_t shortcutPath[MAX_PATH + 1];
+  bool rv = false;
+  // We're skipping building the C runtime to keep the file size low, so we
+  // can't use a normal string initialization because that would call memset.
+  shortcutPath[0] = L'\0';
+  popstring(stacktop, shortcutPath, MAX_PATH);
+
+  rv = PinShortcutToTaskbar(shortcutPath);
+
+  pushstring(stacktop, rv ? L"1" : L"0", 2);
+}
+
+BOOL APIENTRY
+DllMain(HMODULE, DWORD, LPVOID)
+{
+  return TRUE;
+}