base/sys_info_android.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/sys_info.h"
   6
   7 #include <sys/system_properties.h>
   8
   9 #include "base/logging.h"
  10 #include "base/string_number_conversions.h"
  11 #include "base/string_piece.h"
  12
  13 namespace {
  14
  15 // Default version of Android to fall back to when actual version numbers
  16 // cannot be acquired.
  17 // TODO(dfalcantara): Keep this reasonably up to date with the latest publicly
  18 //                    available version of Android.
  19 static const int kDefaultAndroidMajorVersion = 4;
  20 static const int kDefaultAndroidMinorVersion = 0;
  21 static const int kDefaultAndroidBugfixVersion = 3;
  22
  23 // Parse out the OS version numbers from the system properties.
  24 void ParseOSVersionNumbers(const char* os_version_str,
  25                            int32 *major_version,
  26                            int32 *minor_version,
  27                            int32 *bugfix_version) {
  28   if (os_version_str[0]) {
  29     // Try to parse out the version numbers from the string.
  30     int num_read = sscanf(os_version_str, "%d.%d.%d", major_version,
  31                           minor_version, bugfix_version);
  32
  33     if (num_read > 0) {
  34       // If we don't have a full set of version numbers, make the extras 0.
  35       if (num_read < 2) *minor_version = 0;
  36       if (num_read < 3) *bugfix_version = 0;
  37       return;
  38     }
  39   }
  40
  41   // For some reason, we couldn't parse the version number string.
  42   *major_version = kDefaultAndroidMajorVersion;
  43   *minor_version = kDefaultAndroidMinorVersion;
  44   *bugfix_version = kDefaultAndroidBugfixVersion;
  45 }
  46
  47 int ParseHeapSize(const base::StringPiece& str) {
  48   const int64 KB = 1024;
  49   const int64 MB = 1024 * KB;
  50   const int64 GB = 1024 * MB;
  51   CHECK_GT(str.size(), 0u);
  52   int64 factor = 1;
  53   size_t length = str.size();
  54   if (str[length - 1] == 'k') {
  55     factor = KB;
  56     length--;
  57   } else if (str[length - 1] == 'm') {
  58     factor = MB;
  59     length--;
  60   } else if (str[length - 1] == 'g') {
  61     factor = GB;
  62     length--;
  63   } else {
  64     CHECK('0' <= str[length - 1] && str[length - 1] <= '9');
  65   }
  66   int64 result = 0;
  67   bool parsed = base::StringToInt64(str.substr(0, length), &result);
  68   CHECK(parsed);
  69   result = result * factor / MB;
  70   // dalvik.vm.heapsize property is writable by user,
  71   // truncate it to reasonable value to avoid overflows later.
  72   result = std::min<int64>(std::max<int64>(32, result), 1024);
  73   return static_cast<int>(result);
  74 }
  75
  76 int GetDalvikHeapSizeMB() {
  77   char heap_size_str[PROP_VALUE_MAX];
  78   __system_property_get("dalvik.vm.heapsize", heap_size_str);
  79   return ParseHeapSize(heap_size_str);
  80 }
  81
  82 }  // anonymous namespace
  83
  84 namespace base {
  85
  86 std::string SysInfo::OperatingSystemName() {
  87   return "Android";
  88 }
  89
  90 std::string SysInfo::GetAndroidBuildCodename() {
  91   char os_version_codename_str[PROP_VALUE_MAX];
  92   __system_property_get("ro.build.version.codename", os_version_codename_str);
  93   return std::string(os_version_codename_str);
  94 }
  95
  96 std::string SysInfo::GetAndroidBuildID() {
  97   char os_build_id_str[PROP_VALUE_MAX];
  98   __system_property_get("ro.build.id", os_build_id_str);
  99   return std::string(os_build_id_str);
 100 }
 101
 102 std::string SysInfo::GetDeviceName() {
 103   char device_model_str[PROP_VALUE_MAX];
 104   __system_property_get("ro.product.model", device_model_str);
 105   return std::string(device_model_str);
 106 }
 107
 108 void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
 109                                             int32* minor_version,
 110                                             int32* bugfix_version) {
 111   // Read the version number string out from the properties.
 112   char os_version_str[PROP_VALUE_MAX];
 113   __system_property_get("ro.build.version.release", os_version_str);
 114
 115   // Parse out the numbers.
 116   ParseOSVersionNumbers(os_version_str, major_version, minor_version,
 117                         bugfix_version);
 118 }
 119
 120 int SysInfo::DalvikHeapSizeMB() {
 121   static int heap_size = GetDalvikHeapSizeMB();
 122   return heap_size;
 123 }
 124
 125 }  // namespace base