1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
// Copyright 2011 The Chromium Authors
// 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 <array>
#include "base/byte_size.h"
#include "base/check.h"
#include "base/compiler_specific.h"
#include "base/containers/span.h"
#include "base/i18n/number_formatting.h"
#include "base/notreached.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.
constexpr int kByteStrings[] = {IDS_APP_BYTES, IDS_APP_KIBIBYTES,
IDS_APP_MEBIBYTES, IDS_APP_GIBIBYTES,
IDS_APP_TEBIBYTES, IDS_APP_PEBIBYTES};
constexpr 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};
std::u16string FormatBytesInternal(base::ByteSize bytes,
DataUnits units,
bool show_units,
const base::span<const int> suffix) {
DCHECK(units >= DataUnits::kByte && units <= DataUnits::kPebibyte);
// Put the quantity in the right units.
double unit_amount = bytes.InBytesF();
for (int i = 0; i < static_cast<int>(units); ++i) {
unit_amount /= 1024.0;
}
int fractional_digits = 0;
if (!bytes.is_zero() && units != DataUnits::kByte && unit_amount < 100) {
fractional_digits = 1;
}
std::u16string result = base::FormatDouble(unit_amount, fractional_digits);
if (show_units) {
result = l10n_util::GetStringFUTF16(
suffix[static_cast<unsigned int>(units)], result);
}
return result;
}
} // namespace
DataUnits GetByteDisplayUnits(base::ByteSize 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 constexpr auto kUnitThresholds = std::to_array<base::ByteSize>({
base::ByteSize(0), // DataUnits::kByte,
base::KiBU(3), // DataUnits::kKibibyte,
base::MiBU(2), // DataUnits::kMebibyte,
base::GiBU(1), // DataUnits::kGibibyte,
base::TiBU(1), // DataUnits::kTebibyte,
base::PiBU(1) // DataUnits::kPebibyte,
});
static constexpr auto kUnitThresholdsSpan = base::span(kUnitThresholds);
size_t unit_index = kUnitThresholdsSpan.size();
while (--unit_index > 0) {
if (bytes >= kUnitThresholdsSpan[unit_index]) {
break;
}
}
DataUnits units = static_cast<DataUnits>(unit_index);
DCHECK(units >= DataUnits::kByte && units <= DataUnits::kPebibyte);
return units;
}
std::u16string FormatBytesWithUnits(base::ByteSize bytes,
DataUnits units,
bool show_units) {
return FormatBytesInternal(bytes, units, show_units, kByteStrings);
}
std::u16string FormatSpeedWithUnits(base::ByteSize bytes,
DataUnits units,
bool show_units) {
return FormatBytesInternal(bytes, units, show_units, kSpeedStrings);
}
std::u16string FormatBytes(base::ByteSize bytes) {
return FormatBytesWithUnits(bytes, GetByteDisplayUnits(bytes),
/*show_units=*/true);
}
std::u16string FormatSpeed(base::ByteSize bytes) {
return FormatSpeedWithUnits(bytes, GetByteDisplayUnits(bytes),
/*show_units=*/true);
}
} // namespace ui
|
