Native to USB keycode conversion for Mac

webkit/plugins/ppapi/usb_key_code_conversion_mac.mm

+// Copyright (c) 2012 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 "webkit/plugins/ppapi/usb_key_code_conversion.h"
+
+#include "base/basictypes.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
+
+using WebKit::WebKeyboardEvent;
+
+namespace webkit {
+namespace ppapi {
+
+namespace {
+
+typedef struct {
+  uint32_t usb_keycode;
+  uint16_t native_keycode;
+} mac_usb_keymap;
+
+// This is extracted from the conversion table that currently lives in
+// remoting/host/usb_keycode_map.h.
+// TODO(garykac): Remove this copy and use a shared conversion table.
+const mac_usb_keymap mac_keycode_to_usb[] = {
+  {0x070004, 0x0000},  // aA
+  {0x070005, 0x000b},  // bB
+  {0x070006, 0x0008},  // cC
+  {0x070007, 0x0002},  // dD
+  {0x070008, 0x000e},  // eE
+  {0x070009, 0x0003},  // fF
+  {0x07000a, 0x0005},  // gG
+  {0x07000b, 0x0004},  // hH
+  {0x07000c, 0x0022},  // iI
+  {0x07000d, 0x0026},  // jJ
+  {0x07000e, 0x0028},  // kK
+  {0x07000f, 0x0025},  // lL
+  {0x070010, 0x002e},  // mM
+  {0x070011, 0x002d},  // nN
+  {0x070012, 0x001f},  // oO
+  {0x070013, 0x0023},  // pP
+  {0x070014, 0x000c},  // qQ
+  {0x070015, 0x000f},  // rR
+  {0x070016, 0x0001},  // sS
+  {0x070017, 0x0011},  // tT
+  {0x070018, 0x0020},  // uU
+  {0x070019, 0x0009},  // vV
+  {0x07001a, 0x000d},  // wW
+  {0x07001b, 0x0007},  // xX
+  {0x07001c, 0x0010},  // yY
+  {0x07001d, 0x0006},  // zZ
+  {0x07001e, 0x0012},  // 1!
+  {0x07001f, 0x0013},  // 2@
+  {0x070020, 0x0014},  // 3#
+  {0x070021, 0x0015},  // 4$
+  {0x070022, 0x0017},  // 5%
+  {0x070023, 0x0016},  // 6^
+  {0x070024, 0x001a},  // 7&
+  {0x070025, 0x001c},  // 8*
+  {0x070026, 0x0019},  // 9(
+  {0x070027, 0x001d},  // 0)
+  {0x070028, 0x0024},  // Return
+  {0x070029, 0x0035},  // Escape
+  {0x07002a, 0x0033},  // Backspace
+  {0x07002b, 0x0030},  // Tab
+  {0x07002c, 0x0031},  // Spacebar
+  {0x07002d, 0x001b},  // -_
+  {0x07002e, 0x0018},  // =+
+  {0x07002f, 0x0021},  // [{
+  {0x070030, 0x001e},  // }]
+  {0x070031, 0x002a},  // \| (US keyboard only)
+  {0x070032, 0x002a},  // #~ (Non-US)
+  {0x070033, 0x0029},  // ;:
+  {0x070034, 0x0027},  // '"
+  {0x070035, 0x0032},  // `~
+  {0x070036, 0x002b},  // ,<
+  {0x070037, 0x002f},  // .>
+  {0x070038, 0x002c},  // /?
+  {0x070039, 0x0039},  // CapsLock
+  {0x07003a, 0x007a},  // F1
+  {0x07003b, 0x0078},  // F2
+  {0x07003c, 0x0063},  // F3
+  {0x07003d, 0x0076},  // F4
+  {0x07003e, 0x0060},  // F5
+  {0x07003f, 0x0061},  // F6
+  {0x070040, 0x0062},  // F7
+  {0x070041, 0x0064},  // F8
+  {0x070042, 0x0065},  // F9
+  {0x070043, 0x006d},  // F10
+  {0x070044, 0x0067},  // F11
+  {0x070045, 0x006f},  // F12
+  {0x070049, 0x0072},  // Insert
+  {0x07004a, 0x0073},  // Home
+  {0x07004b, 0x0074},  // PageUp
+  {0x07004c, 0x0075},  // Delete (Forward Delete)
+  {0x07004d, 0x0077},  // End
+  {0x07004e, 0x0079},  // PageDown
+  {0x07004f, 0x007c},  // RightArrow
+  {0x070050, 0x007b},  // LeftArrow
+  {0x070051, 0x007d},  // DownArrow
+  {0x070052, 0x007e},  // UpArrow
+  {0x070053, 0x0047},  // Keypad_NumLock Clear
+  {0x070054, 0x004b},  // Keypad_/
+  {0x070055, 0x0043},  // Keypad_*
+  {0x070056, 0x004e},  // Keypad_-
+  {0x070057, 0x0045},  // Keypad_+
+  {0x070058, 0x004c},  // Keypad_Enter
+  {0x070059, 0x0053},  // Keypad_1 End
+  {0x07005a, 0x0054},  // Keypad_2 DownArrow
+  {0x07005b, 0x0055},  // Keypad_3 PageDown
+  {0x07005c, 0x0056},  // Keypad_4 LeftArrow
+  {0x07005d, 0x0057},  // Keypad_5
+  {0x07005e, 0x0058},  // Keypad_6 RightArrow
+  {0x07005f, 0x0059},  // Keypad_7 Home
+  {0x070060, 0x005b},  // Keypad_8 UpArrow
+  {0x070061, 0x005c},  // Keypad_9 PageUp
+  {0x070062, 0x0052},  // Keypad_0 Insert
+  {0x070063, 0x0041},  // Keypad_. Delete
+  {0x070067, 0x0051},  // Keypad_=
+  {0x070068, 0x0069},  // F13
+  {0x070069, 0x006b},  // F14
+  {0x07006a, 0x0071},  // F15
+  {0x07006b, 0x006a},  // F16
+  {0x07006c, 0x0040},  // F17
+  {0x07006d, 0x004f},  // F18
+  {0x07006e, 0x0050},  // F19
+  {0x07006f, 0x005a},  // F20
+  {0x07007f, 0x004a},  // Mute
+  {0x070080, 0x0048},  // VolumeUp
+  {0x070081, 0x0049},  // VolumeDown
+  {0x070085, 0x005f},  // Keypad_Comma
+  {0x070087, 0x005e},  // International1
+  {0x070088, 0x0068},  // International2
+  {0x070089, 0x005d},  // International3
+  {0x0700e0, 0x003b},  // LeftControl

[dmichael (off chromium), 2012/03/14 19:36:02]

There's a discontinuity here. Is that expected & correct?

[garykac, 2012/03/14 20:26:06]

Yes. In that space there's a bunch of special Keypad keys and a chunk of unused
codes before the ctrl/shift/cmd keys.

[dmichael (off chromium), 2012/03/14 20:50:26]

A short comment to that effect might help, just so it is clear to future readers
that it's not a mistake.

+  {0x0700e1, 0x0038},  // LeftShift
+  {0x0700e2, 0x003a},  // LeftAlt/Option
+  {0x0700e3, 0x0037},  // LeftGUI/Super/Win/Cmd
+  {0x0700e4, 0x003e},  // RightControl
+  {0x0700e5, 0x003c},  // RightShift
+  {0x0700e6, 0x003d},  // RightAlt/Option
+  {0x0700e7, 0x0036},  // RightGUI/Super/Win/Cmd
+};
+
+} // anonymous namespace
+
+uint32_t UsbKeyCodeForKeyboardEvent(const WebKeyboardEvent& key_event) {
+  if (key_event.nativeKeyCode < 0 || key_event.nativeKeyCode > 0x7f)
+    return 0;
+
+  for (uint i = 0; i < arraysize(mac_keycode_to_usb); i++) {
+    if (mac_keycode_to_usb[i].native_keycode == key_event.nativeKeyCode)
+      return mac_keycode_to_usb[i].usb_keycode;
+  }
+
+  return 0;
+}
+
+}  // namespace ppapi
+}  // namespace webkit