text: // 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 "base/sys_info.h"
  
  #include <sys/system_properties.h>
  
  #include "base/logging.h"
  #include "base/string_number_conversions.h"
  #include "base/string_piece.h"
  
  namespace {
  
  // Default version of Android to fall back to when actual version numbers
  // cannot be acquired.
  // TODO(dfalcantara): Keep this reasonably up to date with the latest publicly
  //                    available version of Android.
  static const int kDefaultAndroidMajorVersion = 4;
  static const int kDefaultAndroidMinorVersion = 0;
  static const int kDefaultAndroidBugfixVersion = 3;
  
  // Parse out the OS version numbers from the system properties.
  void ParseOSVersionNumbers(const char* os_version_str,
                             int32 *major_version,
                             int32 *minor_version,
                             int32 *bugfix_version) {
    if (os_version_str[0]) {
      // Try to parse out the version numbers from the string.
      int num_read = sscanf(os_version_str, "%d.%d.%d", major_version,
                            minor_version, bugfix_version);
  
      if (num_read > 0) {
        // If we don't have a full set of version numbers, make the extras 0.
        if (num_read < 2) *minor_version = 0;
        if (num_read < 3) *bugfix_version = 0;
        return;
      }
    }
  
    // For some reason, we couldn't parse the version number string.
    *major_version = kDefaultAndroidMajorVersion;
    *minor_version = kDefaultAndroidMinorVersion;
    *bugfix_version = kDefaultAndroidBugfixVersion;
  }
  
  int ParseHeapSize(const base::StringPiece& str) {
    const int64 KB = 1024;
    const int64 MB = 1024 * KB;
    const int64 GB = 1024 * MB;
    CHECK_GT(str.size(), 0u);
    int64 factor = 1;
    size_t length = str.size();
    if (str[length - 1] == 'k') {
      factor = KB;
      length--;
    } else if (str[length - 1] == 'm') {
      factor = MB;
      length--;
    } else if (str[length - 1] == 'g') {
      factor = GB;
      length--;
    } else {
      CHECK('0' <= str[length - 1] && str[length - 1] <= '9');
    }
    int64 result = 0;
    bool parsed = base::StringToInt64(str.substr(0, length), &result);
    CHECK(parsed);
    result = result * factor / MB;
    // dalvik.vm.heapsize property is writable by user,
    // truncate it to reasonable value to avoid overflows later.
    result = std::min<int64>(std::max<int64>(32, result), 1024);
    return static_cast<int>(result);
  }
  
  int GetDalvikHeapSizeMB() {
    char heap_size_str[PROP_VALUE_MAX];
    __system_property_get("dalvik.vm.heapsize", heap_size_str);
    return ParseHeapSize(heap_size_str);
  }
  
  }  // anonymous namespace
  
  namespace base {
  
  std::string SysInfo::GetAndroidBuildCodename() {
    char os_version_codename_str[PROP_VALUE_MAX];
    __system_property_get("ro.build.version.codename", os_version_codename_str);
    return std::string(os_version_codename_str);
  }
  
  std::string SysInfo::GetAndroidBuildID() {
    char os_build_id_str[PROP_VALUE_MAX];
    __system_property_get("ro.build.id", os_build_id_str);
    return std::string(os_build_id_str);
  }
  
  std::string SysInfo::GetDeviceName() {
    char device_model_str[PROP_VALUE_MAX];
    __system_property_get("ro.product.model", device_model_str);
    return std::string(device_model_str);
  }
  
  void SysInfo::OperatingSystemVersionNumbers(int32* major_version,
                                              int32* minor_version,
                                              int32* bugfix_version) {
    // Read the version number string out from the properties.
    char os_version_str[PROP_VALUE_MAX];
    __system_property_get("ro.build.version.release", os_version_str);
  
    // Parse out the numbers.
    ParseOSVersionNumbers(os_version_str, major_version, minor_version,
                          bugfix_version);
  }
  
  int SysInfo::DalvikHeapSizeMB() {
    static int heap_size = GetDalvikHeapSizeMB();
    return heap_size;
  }
  
  }  // namespace base
  