1 files changed, 85 insertions, 0 deletions
diff --git a/widget/nsCUPSShim.h b/widget/nsCUPSShim.h
new file mode 100644
index 0000000000..658c1e7a17
--- /dev/null
+++ b/widget/nsCUPSShim.h
@@ -0,0 +1,85 @@
+/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ex: set tabstop=8 softtabstop=2 shiftwidth=2 expandtab: */
+/* 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/. */
+
+#ifndef nsCUPSShim_h___
+#define nsCUPSShim_h___
+
+#include <cups/cups.h>
+#include "mozilla/Atomics.h"
+#include "mozilla/Mutex.h"
+
+// TODO: This should be a configure option, ideally.
+#ifndef XP_MACOSX
+#  define CUPS_SHIM_RUNTIME_LINK
+#endif
+
+struct PRLibrary;
+
+class nsCUPSShim {
+ public:
+#ifdef CUPS_SHIM_RUNTIME_LINK
+  nsCUPSShim();
+  bool InitOkay() { return mInitOkay; }
+#else
+  nsCUPSShim() = default;
+  bool InitOkay() { return true; }
+#endif
+
+  /**
+   * Function pointers for supported functions. These are only
+   * valid after successful initialization.
+   */
+#define CUPS_SHIM_ALL_FUNCS(X) \
+  X(cupsAddOption)             \
+  X(cupsCheckDestSupported)    \
+  X(cupsConnectDest)           \
+  X(cupsCopyDest)              \
+  X(cupsCopyDestInfo)          \
+  X(cupsDoRequest)             \
+  X(cupsEnumDests)             \
+  X(cupsFindDestDefault)       \
+  X(cupsFreeDestInfo)          \
+  X(cupsFreeDests)             \
+  X(cupsGetDestMediaDefault)   \
+  X(cupsGetDestMediaCount)     \
+  X(cupsGetDestMediaByIndex)   \
+  X(cupsGetDestMediaByName)    \
+  X(cupsGetDest)               \
+  X(cupsGetDests)              \
+  X(cupsGetNamedDest)          \
+  X(cupsGetOption)             \
+  X(cupsLocalizeDestMedia)     \
+  X(cupsPrintFile)             \
+  X(cupsTempFd)                \
+  X(httpClose)                 \
+  X(ippAddString)              \
+  X(ippAddStrings)             \
+  X(ippDelete)                 \
+  X(ippFindAttribute)          \
+  X(ippGetCount)               \
+  X(ippGetString)              \
+  X(ippNewRequest)
+
+#ifdef CUPS_SHIM_RUNTIME_LINK
+  // Define a single field which holds a function pointer.
+#  define CUPS_SHIM_FUNC_DECL(X) decltype(::X)* X = nullptr;
+#else
+  // Define a static constexpr function pointer. GCC can sometimes optimize
+  // away the pointer fetch for this.
+#  define CUPS_SHIM_FUNC_DECL(X) static constexpr decltype(::X)* const X = ::X;
+#endif
+
+  CUPS_SHIM_ALL_FUNCS(CUPS_SHIM_FUNC_DECL)
+#undef CUPS_SHIM_FUNC_DECL
+
+#ifdef CUPS_SHIM_RUNTIME_LINK
+ private:
+  bool mInitOkay = false;
+  PRLibrary* mCupsLib = nullptr;
+#endif
+};
+
+#endif /* nsCUPSShim_h___ */