1 // Copyright (c) 2011 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 "ui/base/text/bytes_formatting.h" 6 7 #include "base/i18n/number_formatting.h" 8 #include "base/logging.h" 9 #include "base/strings/string_util.h" 10 #include "base/strings/utf_string_conversions.h" 11 #include "ui/base/l10n/l10n_util.h" 12 #include "ui/strings/grit/ui_strings.h" 13 14 namespace ui { 15 16 namespace { 17 18 // Byte suffix string constants. These both must match the DataUnits enum. 19 const int kByteStrings[] = { 20 IDS_APP_BYTES, 21 IDS_APP_KIBIBYTES, 22 IDS_APP_MEBIBYTES, 23 IDS_APP_GIBIBYTES, 24 IDS_APP_TEBIBYTES, 25 IDS_APP_PEBIBYTES 26 }; 27 28 const int kSpeedStrings[] = { 29 IDS_APP_BYTES_PER_SECOND, 30 IDS_APP_KIBIBYTES_PER_SECOND, 31 IDS_APP_MEBIBYTES_PER_SECOND, 32 IDS_APP_GIBIBYTES_PER_SECOND, 33 IDS_APP_TEBIBYTES_PER_SECOND, 34 IDS_APP_PEBIBYTES_PER_SECOND 35 }; 36 37 base::string16 FormatBytesInternal(int64 bytes, 38 DataUnits units, 39 bool show_units, 40 const int* const suffix) { 41 DCHECK(units >= DATA_UNITS_BYTE && units <= DATA_UNITS_PEBIBYTE); 42 if (bytes < 0) { 43 NOTREACHED() << "Negative bytes value"; 44 return base::string16(); 45 } 46 47 // Put the quantity in the right units. 48 double unit_amount = static_cast<double>(bytes); 49 for (int i = 0; i < units; ++i) 50 unit_amount /= 1024.0; 51 52 int fractional_digits = 0; 53 if (bytes != 0 && units != DATA_UNITS_BYTE && unit_amount < 100) 54 fractional_digits = 1; 55 56 base::string16 result = base::FormatDouble(unit_amount, fractional_digits); 57 58 if (show_units) 59 result = l10n_util::GetStringFUTF16(suffix[units], result); 60 61 return result; 62 } 63 64 } // namespace 65 66 DataUnits GetByteDisplayUnits(int64 bytes) { 67 // The byte thresholds at which we display amounts. A byte count is displayed 68 // in unit U when kUnitThresholds[U] <= bytes < kUnitThresholds[U+1]. 69 // This must match the DataUnits enum. 70 static const int64 kUnitThresholds[] = { 71 0, // DATA_UNITS_BYTE, 72 3 * (1LL << 10), // DATA_UNITS_KIBIBYTE, 73 2 * (1LL << 20), // DATA_UNITS_MEBIBYTE, 74 1LL << 30, // DATA_UNITS_GIBIBYTE, 75 1LL << 40, // DATA_UNITS_TEBIBYTE, 76 1LL << 50 // DATA_UNITS_PEBIBYTE, 77 }; 78 79 if (bytes < 0) { 80 NOTREACHED() << "Negative bytes value"; 81 return DATA_UNITS_BYTE; 82 } 83 84 int unit_index = arraysize(kUnitThresholds); 85 while (--unit_index > 0) { 86 if (bytes >= kUnitThresholds[unit_index]) 87 break; 88 } 89 90 DCHECK(unit_index >= DATA_UNITS_BYTE && unit_index <= DATA_UNITS_PEBIBYTE); 91 return DataUnits(unit_index); 92 } 93 94 base::string16 FormatBytesWithUnits(int64 bytes, 95 DataUnits units, 96 bool show_units) { 97 return FormatBytesInternal(bytes, units, show_units, kByteStrings); 98 } 99 100 base::string16 FormatSpeedWithUnits(int64 bytes, 101 DataUnits units, 102 bool show_units) { 103 return FormatBytesInternal(bytes, units, show_units, kSpeedStrings); 104 } 105 106 base::string16 FormatBytes(int64 bytes) { 107 return FormatBytesWithUnits(bytes, GetByteDisplayUnits(bytes), true); 108 } 109 110 base::string16 FormatSpeed(int64 bytes) { 111 return FormatSpeedWithUnits(bytes, GetByteDisplayUnits(bytes), true); 112 } 113 114 } // namespace ui 115
