| // Copyright (c) 2011 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 "ui/base/text/bytes_formatting.h" |
| |
| #include "base/i18n/number_formatting.h" |
| #include "base/logging.h" |
| #include "base/strings/string_util.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "grit/ui_strings.h" |
| #include "ui/base/l10n/l10n_util.h" |
| |
| namespace ui { |
| |
| namespace { |
| |
| // Byte suffix string constants. These both must match the DataUnits enum. |
| const int kByteStrings[] = { |
| IDS_APP_BYTES, |
| IDS_APP_KIBIBYTES, |
| IDS_APP_MEBIBYTES, |
| IDS_APP_GIBIBYTES, |
| IDS_APP_TEBIBYTES, |
| IDS_APP_PEBIBYTES |
| }; |
| |
| const int kSpeedStrings[] = { |
| IDS_APP_BYTES_PER_SECOND, |
| IDS_APP_KIBIBYTES_PER_SECOND, |
| IDS_APP_MEBIBYTES_PER_SECOND, |
| IDS_APP_GIBIBYTES_PER_SECOND, |
| IDS_APP_TEBIBYTES_PER_SECOND, |
| IDS_APP_PEBIBYTES_PER_SECOND |
| }; |
| |
| base::string16 FormatBytesInternal(int64 bytes, |
| DataUnits units, |
| bool show_units, |
| const int* const suffix) { |
| DCHECK(units >= DATA_UNITS_BYTE && units <= DATA_UNITS_PEBIBYTE); |
| if (bytes < 0) { |
| NOTREACHED() << "Negative bytes value"; |
| return base::string16(); |
| } |
| |
| // Put the quantity in the right units. |
| double unit_amount = static_cast<double>(bytes); |
| for (int i = 0; i < units; ++i) |
| unit_amount /= 1024.0; |
| |
| int fractional_digits = 0; |
| if (bytes != 0 && units != DATA_UNITS_BYTE && unit_amount < 100) |
| fractional_digits = 1; |
| |
| base::string16 result = base::FormatDouble(unit_amount, fractional_digits); |
| |
| if (show_units) |
| result = l10n_util::GetStringFUTF16(suffix[units], result); |
| |
| return result; |
| } |
| |
| } // namespace |
| |
| DataUnits GetByteDisplayUnits(int64 bytes) { |
| // The byte thresholds at which we display amounts. A byte count is displayed |
| // in unit U when kUnitThresholds[U] <= bytes < kUnitThresholds[U+1]. |
| // This must match the DataUnits enum. |
| static const int64 kUnitThresholds[] = { |
| 0, // DATA_UNITS_BYTE, |
| 3 * (1LL << 10), // DATA_UNITS_KIBIBYTE, |
| 2 * (1LL << 20), // DATA_UNITS_MEBIBYTE, |
| 1LL << 30, // DATA_UNITS_GIBIBYTE, |
| 1LL << 40, // DATA_UNITS_TEBIBYTE, |
| 1LL << 50 // DATA_UNITS_PEBIBYTE, |
| }; |
| |
| if (bytes < 0) { |
| NOTREACHED() << "Negative bytes value"; |
| return DATA_UNITS_BYTE; |
| } |
| |
| int unit_index = arraysize(kUnitThresholds); |
| while (--unit_index > 0) { |
| if (bytes >= kUnitThresholds[unit_index]) |
| break; |
| } |
| |
| DCHECK(unit_index >= DATA_UNITS_BYTE && unit_index <= DATA_UNITS_PEBIBYTE); |
| return DataUnits(unit_index); |
| } |
| |
| base::string16 FormatBytesWithUnits(int64 bytes, |
| DataUnits units, |
| bool show_units) { |
| return FormatBytesInternal(bytes, units, show_units, kByteStrings); |
| } |
| |
| base::string16 FormatSpeedWithUnits(int64 bytes, |
| DataUnits units, |
| bool show_units) { |
| return FormatBytesInternal(bytes, units, show_units, kSpeedStrings); |
| } |
| |
| base::string16 FormatBytes(int64 bytes) { |
| return FormatBytesWithUnits(bytes, GetByteDisplayUnits(bytes), true); |
| } |
| |
| base::string16 FormatSpeed(int64 bytes) { |
| return FormatSpeedWithUnits(bytes, GetByteDisplayUnits(bytes), true); |
| } |
| |
| } // namespace ui |