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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/byte_count.h"
#include <ostream>
#include "base/strings/string_number_conversions.h"
namespace base {
std::ostream& operator<<(std::ostream& os, ByteCount byte_count) {
int64_t bytes = byte_count.InBytes();
// If it's exactly 0 then stream and return.
if (bytes == 0) {
os << "0B";
return os;
}
// If it's exactly INT64_MIN then stream and return. Later in this function,
// negative values are handled by processing their absolute value, but
// INT64_MIN, like all two's complement minimums, has no corresponding
// positive value within range.
if (bytes == std::numeric_limits<int64_t>::min()) {
os << "-8EiB";
return os;
}
// Reserve enough space (e.g. "-1152920504606846976B (-1023.999PiB)" which is
// a full 64-bit negative value with four digits before the decimal).
std::string result;
result.reserve(36);
// Separate out the sign, as it's easier to do magnitude tests on positive
// values.
bool is_negative = bytes < 0;
if (is_negative) {
bytes = -bytes;
byte_count = -byte_count;
result += "-";
}
// If it's an exact number of [EPTGMK]kB then stream that, unless it's a
// quantity measurable by the next magnitude prefix (e.g. if the value is in
// the pebibyte range but it happens to be divisible by 1024 it shouldn't be
// logged in KiB).
if (bytes % EiB(1).InBytes() == 0) {
result += NumberToString(byte_count.InEiB());
result += "EiB";
} else if (bytes % PiB(1).InBytes() == 0 && bytes / EiB(1).InBytes() == 0) {
result += NumberToString(byte_count.InPiB());
result += "PiB";
} else if (bytes % TiB(1).InBytes() == 0 && bytes / PiB(1).InBytes() == 0) {
result += NumberToString(byte_count.InTiB());
result += "TiB";
} else if (bytes % GiB(1).InBytes() == 0 && bytes / TiB(1).InBytes() == 0) {
result += NumberToString(byte_count.InGiB());
result += "GiB";
} else if (bytes % MiB(1).InBytes() == 0 && bytes / GiB(1).InBytes() == 0) {
result += NumberToString(byte_count.InMiB());
result += "MiB";
} else if (bytes % KiB(1).InBytes() == 0 && bytes / MiB(1).InBytes() == 0) {
result += NumberToString(byte_count.InKiB());
result += "KiB";
} else {
// If not, then stream the exact byte count plus (if larger than 1KiB) an
// estimate for scale.
result += NumberToString(bytes);
result += "B";
if (bytes > KiB(1).InBytes()) {
result += " (";
if (is_negative) {
result += "-";
}
if (bytes > EiB(1).InBytes()) {
result += NumberToStringWithFixedPrecision(byte_count.InEiBF(), 3);
result += "EiB";
} else if (bytes > PiB(1).InBytes()) {
result += NumberToStringWithFixedPrecision(byte_count.InPiBF(), 3);
result += "PiB";
} else if (bytes > TiB(1).InBytes()) {
result += NumberToStringWithFixedPrecision(byte_count.InTiBF(), 3);
result += "TiB";
} else if (bytes > GiB(1).InBytes()) {
result += NumberToStringWithFixedPrecision(byte_count.InGiBF(), 3);
result += "GiB";
} else if (bytes > MiB(1).InBytes()) {
result += NumberToStringWithFixedPrecision(byte_count.InMiBF(), 3);
result += "MiB";
} else {
result += NumberToStringWithFixedPrecision(byte_count.InKiBF(), 3);
result += "KiB";
}
result += ")";
}
}
os << result;
return os;
}
} // namespace base
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