blob: 7f98c6b6e533271c197c12ea977a1df251f9e423 [file] [log] [blame]
// 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 "ui/base/l10n/l10n_util.h"
#include "ui/strings/grit/ui_strings.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