Add arraysize macro from Chromium

debian/copyright

@@ -45,7 +45,8 @@ Files: src/core/fht.*
 Copyright: 2004, Melchior FRANZ <mfranz@kde.org>
 License: GPL-2+
 
-Files: src/core/scoped_nsobject.h
+Files: ext/libclementine-common/core/arraysize.h
+       src/core/scoped_nsobject.h
        src/core/scoped_cftyperef.h
        src/core/scoped_nsautorelease_pool.*
 Copyright: 2011, The Chromium Authors

ext/clementine-spotifyblob/spotifyclient.cpp

@@ -18,21 +18,23 @@
 // it is used by the Spotify blob which links against libspotify and is not GPL
 // compatible.
 
-#include <algorithm>
-
-#include "mediapipeline.h"
 #include "spotifyclient.h"
-#include "spotifykey.h"
-#include "spotifymessages.pb.h"
-#include "spotify_utilities.h"
-#include "core/logging.h"
+
+#include <algorithm>
 
 #include <QCoreApplication>
 #include <QDir>
 #include <QHostAddress>
 #include <QTcpSocket>
 #include <QTimer>
 
+#include "core/arraysize.h"
+#include "core/logging.h"
+#include "mediapipeline.h"
+#include "spotifykey.h"
+#include "spotifymessages.pb.h"
+#include "spotify_utilities.h"
+
 const int SpotifyClient::kSpotifyImageIDSize = 20;
 const int SpotifyClient::kWaveHeaderSize = 44;
 
@@ -615,7 +617,7 @@ void SpotifyClient::ConvertTrack(sp_track* track, pb::spotify::Track* pb) {
   // URI - Blugh
   char uri[256];
   sp_link* link = sp_link_create_from_track(track, 0);
-  sp_link_as_string(link, uri, sizeof(uri));
+  sp_link_as_string(link, uri, arraysize(uri));
   sp_link_release(link);
 
   pb->set_uri(uri);
@@ -645,7 +647,7 @@ void SpotifyClient::ConvertAlbum(sp_album* album, pb::spotify::Track* pb) {
   // URI - Blugh
   char uri[256];
   sp_link* link = sp_link_create_from_album(album);
-  sp_link_as_string(link, uri, sizeof(uri));
+  sp_link_as_string(link, uri, arraysize(uri));
   sp_link_release(link);
 
   pb->set_uri(uri);

ext/libclementine-common/core/arraysize.h

@@ -0,0 +1,34 @@
+// Copyright 2014 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.
+
+// From Chromium src/base/macros.h
+
+#include <stddef.h>  // For size_t.
+
+// The arraysize(arr) macro returns the # of elements in an array arr.
+// The expression is a compile-time constant, and therefore can be
+// used in defining new arrays, for example.  If you use arraysize on
+// a pointer by mistake, you will get a compile-time error.
+//
+// One caveat is that arraysize() doesn't accept any array of an
+// anonymous type or a type defined inside a function.  In these rare
+// cases, you have to use the unsafe ARRAYSIZE_UNSAFE() macro below.  This is
+// due to a limitation in C++'s template system.  The limitation might
+// eventually be removed, but it hasn't happened yet.
+
+// This template function declaration is used in defining arraysize.
+// Note that the function doesn't need an implementation, as we only
+// use its type.
+template <typename T, size_t N>
+char (&ArraySizeHelper(T (&array)[N]))[N];
+
+// That gcc wants both of these prototypes seems mysterious. VC, for
+// its part, can't decide which to use (another mystery). Matching of
+// template overloads: the final frontier.
+#ifndef _MSC_VER
+template <typename T, size_t N>
+char (&ArraySizeHelper(const T (&array)[N]))[N];
+#endif
+
+#define arraysize(array) (sizeof(ArraySizeHelper(array)))

src/analyzers/nyancatanalyzer.cpp

@@ -16,13 +16,15 @@
 */
 
 #include "nyancatanalyzer.h"
-#include "core/logging.h"
 
 #include <cmath>
 
 #include <QTimerEvent>
 #include <QBrush>
 
+#include "core/arraysize.h"
+#include "core/logging.h"
+
 const char* NyanCatAnalyzer::kName = "Nyanalyzer cat";
 const float NyanCatAnalyzer::kPixelScale = 0.02f;
 
@@ -36,7 +38,7 @@ NyanCatAnalyzer::NyanCatAnalyzer(QWidget* parent)
       px_per_frame_(0),
       x_offset_(0),
       background_brush_(QColor(0x0f, 0x43, 0x73)) {
-  memset(history_, 0, sizeof(history_));
+  memset(history_, 0, arraysize(history_));
 
   for (int i = 0; i < kRainbowBands; ++i) {
     colors_[i] = QPen(QColor::fromHsv(i * 255 / kRainbowBands, 255, 255),

src/moodbar/moodbarrenderer.cpp

@@ -20,6 +20,8 @@
 #include <QPainter>
 #include <QPalette>
 
+#include "core/arraysize.h"
+
 const int MoodbarRenderer::kNumHues = 12;
 
 ColorVector MoodbarRenderer::Colors(const QByteArray& data, MoodbarStyle style,
@@ -60,7 +62,7 @@ ColorVector MoodbarRenderer::Colors(const QByteArray& data, MoodbarStyle style,
   int hue_distribution[360];
   int total = 0;
 
-  memset(hue_distribution, 0, sizeof(hue_distribution));
+  memset(hue_distribution, 0, arraysize(hue_distribution));
 
   ColorVector colors;