1 files changed, 237 insertions, 0 deletions
diff --git a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/SysInfo.java b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/SysInfo.java
new file mode 100644
index 000000000..5c53ef465
--- /dev/null
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/SysInfo.java
@@ -0,0 +1,237 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
+ * 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/. */
+
+package org.mozilla.gecko;
+
+import android.os.StrictMode;
+import android.util.Log;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import java.util.regex.Pattern;
+
+/**
+ * A collection of system info values, broadly mirroring a subset of
+ * nsSystemInfo. See also the constants in AppConstants, which reflect
+ * much of nsIXULAppInfo.
+ */
+// Normally, we'd annotate with @RobocopTarget.  Since SysInfo is compiled
+// before RobocopTarget, we instead add o.m.g.SysInfo directly to the Proguard
+// configuration.
+public final class SysInfo {
+    private static final String LOG_TAG = "GeckoSysInfo";
+
+    // Number of bytes of /proc/meminfo to read in one go.
+    private static final int MEMINFO_BUFFER_SIZE_BYTES = 256;
+
+    // We don't mind an instant of possible duplicate work, we only wish to
+    // avoid inconsistency, so we don't bother with synchronization for
+    // these.
+    private static volatile int cpuCount = -1;
+
+    private static volatile int totalRAM = -1;
+
+    /**
+     * Get the number of cores on the device.
+     *
+     * We can't use a nice tidy API call, because they're all wrong:
+     *
+     * <http://stackoverflow.com/questions/7962155/how-can-you-detect-a-dual-core-
+     * cpu-on-an-android-device-from-code>
+     *
+     * This method is based on that code.
+     *
+     * @return the number of CPU cores, or 1 if the number could not be
+     *         determined.
+     */
+    public static int getCPUCount() {
+        if (cpuCount > 0) {
+            return cpuCount;
+        }
+
+        // Avoid a strict mode warning.
+        StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();
+        try {
+            return readCPUCount();
+        } finally {
+            StrictMode.setThreadPolicy(savedPolicy);
+        }
+    }
+
+    private static int readCPUCount() {
+        class CpuFilter implements FileFilter {
+            @Override
+            public boolean accept(File pathname) {
+                return Pattern.matches("cpu[0-9]+", pathname.getName());
+            }
+        }
+        try {
+            final File dir = new File("/sys/devices/system/cpu/");
+            return cpuCount = dir.listFiles(new CpuFilter()).length;
+        } catch (Exception e) {
+            Log.w(LOG_TAG, "Assuming 1 CPU; got exception.", e);
+            return cpuCount = 1;
+        }
+    }
+
+    /**
+     * Helper functions used to extract key/value data from /proc/meminfo
+     * Pulled from:
+     * http://androidxref.com/4.2_r1/xref/frameworks/base/core/java/com/android/internal/util/MemInfoReader.java
+     */
+    private static boolean matchMemText(byte[] buffer, int index, int bufferLength, byte[] text) {
+        final int N = text.length;
+        if ((index + N) >= bufferLength) {
+            return false;
+        }
+        for (int i = 0; i < N; i++) {
+            if (buffer[index + i] != text[i]) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Parses a line like:
+     *
+     *  MemTotal: 1605324 kB
+     *
+     * into 1605324.
+     *
+     * @return the first uninterrupted sequence of digits following the
+     *         specified index, parsed as an integer value in KB.
+     */
+    private static int extractMemValue(byte[] buffer, int offset, int length) {
+        if (offset >= length) {
+            return 0;
+        }
+
+        while (offset < length && buffer[offset] != '\n') {
+            if (buffer[offset] >= '0' && buffer[offset] <= '9') {
+                int start = offset++;
+                while (offset < length &&
+                       buffer[offset] >= '0' &&
+                       buffer[offset] <= '9') {
+                    ++offset;
+                }
+                return Integer.parseInt(new String(buffer, start, offset - start), 10);
+            }
+            ++offset;
+        }
+        return 0;
+    }
+
+    /**
+     * Fetch the total memory of the device in MB by parsing /proc/meminfo.
+     *
+     * Of course, Android doesn't have a neat and tidy way to find total
+     * RAM, so we do it by parsing /proc/meminfo.
+     *
+     * @return 0 if a problem occurred, or memory size in MB.
+     */
+    public static int getMemSize() {
+        if (totalRAM >= 0) {
+            return totalRAM;
+        }
+
+        // This is the string "MemTotal" that we're searching for in the buffer.
+        final byte[] MEMTOTAL = {'M', 'e', 'm', 'T', 'o', 't', 'a', 'l'};
+
+        // `/proc/meminfo` is not a real file and thus safe to read on the main thread.
+        final StrictMode.ThreadPolicy savedPolicy = StrictMode.allowThreadDiskReads();
+        try {
+            final byte[] buffer = new byte[MEMINFO_BUFFER_SIZE_BYTES];
+            final FileInputStream is = new FileInputStream("/proc/meminfo");
+            try {
+                final int length = is.read(buffer);
+
+                for (int i = 0; i < length; i++) {
+                    if (matchMemText(buffer, i, length, MEMTOTAL)) {
+                        i += 8;
+                        totalRAM = extractMemValue(buffer, i, length) / 1024;
+                        Log.d(LOG_TAG, "System memory: " + totalRAM + "MB.");
+                        return totalRAM;
+                    }
+                }
+            } finally {
+                is.close();
+            }
+
+            Log.w(LOG_TAG, "Did not find MemTotal line in /proc/meminfo.");
+            return totalRAM = 0;
+        } catch (FileNotFoundException f) {
+            return totalRAM = 0;
+        } catch (IOException e) {
+            return totalRAM = 0;
+        } finally {
+            StrictMode.setThreadPolicy(savedPolicy);
+        }
+    }
+
+    /**
+     * @return the SDK version supported by this device, such as '16'.
+     */
+    public static int getVersion() {
+        return android.os.Build.VERSION.SDK_INT;
+    }
+
+    /**
+     * @return the release version string, such as "4.1.2".
+     */
+    public static String getReleaseVersion() {
+        return android.os.Build.VERSION.RELEASE;
+    }
+
+    /**
+     * @return the kernel version string, such as "3.4.10-geb45596".
+     */
+    public static String getKernelVersion() {
+        return System.getProperty("os.version", "");
+    }
+
+    /**
+     * @return the device manufacturer, such as "HTC".
+     */
+    public static String getManufacturer() {
+        return android.os.Build.MANUFACTURER;
+    }
+
+    /**
+     * @return the device name, such as "HTC One".
+     */
+    public static String getDevice() {
+        // No, not android.os.Build.DEVICE.
+        return android.os.Build.MODEL;
+    }
+
+    /**
+     * @return the Android "hardware" identifier, such as "m7".
+     */
+    public static String getHardware() {
+        return android.os.Build.HARDWARE;
+    }
+
+    /**
+     * @return the system OS name. Hardcoded to "Android".
+     */
+    public static String getName() {
+        // We deliberately differ from PR_SI_SYSNAME, which is "Linux".
+        return "Android";
+    }
+
+    /**
+     * @return the Android architecture string, including ABI.
+     */
+    public static String getArchABI() {
+        // Android likes to include the ABI, too ("armeabiv7"), so we
+        // differ to add value.
+        return android.os.Build.CPU_ABI;
+    }
+}