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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_size.h"
#include <ostream>
#include <string>
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
namespace base {
namespace {
constexpr uint64_t kOneKiB = KiBU(1).InBytes();
constexpr uint64_t kOneMiB = MiBU(1).InBytes();
constexpr uint64_t kOneGiB = GiBU(1).InBytes();
constexpr uint64_t kOneTiB = TiBU(1).InBytes();
constexpr uint64_t kOnePiB = PiBU(1).InBytes();
constexpr uint64_t kOneEiB = EiBU(1).InBytes();
void AppendMagnitude(std::string* dest,
ByteSize magnitude,
const std::string& sign_prefix = "") {
uint64_t bytes = magnitude.InBytes();
StrAppend(dest, {sign_prefix});
// 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 % kOneEiB == 0) {
StrAppend(dest, {NumberToString(magnitude.InEiB()), "EiB"});
} else if (bytes % kOnePiB == 0 && bytes / kOneEiB == 0) {
StrAppend(dest, {NumberToString(magnitude.InPiB()), "PiB"});
} else if (bytes % kOneTiB == 0 && bytes / kOnePiB == 0) {
StrAppend(dest, {NumberToString(magnitude.InTiB()), "TiB"});
} else if (bytes % kOneGiB == 0 && bytes / kOneTiB == 0) {
StrAppend(dest, {NumberToString(magnitude.InGiB()), "GiB"});
} else if (bytes % kOneMiB == 0 && bytes / kOneGiB == 0) {
StrAppend(dest, {NumberToString(magnitude.InMiB()), "MiB"});
} else if (bytes % kOneKiB == 0 && bytes / kOneMiB == 0) {
StrAppend(dest, {NumberToString(magnitude.InKiB()), "KiB"});
} else {
// If not, then stream the exact byte count plus (if larger than 1KiB) an
// estimate for scale.
StrAppend(dest, {NumberToString(bytes), "B"});
if (bytes > kOneKiB) {
StrAppend(dest, {" (", sign_prefix});
if (bytes > kOneEiB) {
StrAppend(
dest,
{NumberToStringWithFixedPrecision(magnitude.InEiBF(), 3), "EiB"});
} else if (bytes > kOnePiB) {
StrAppend(
dest,
{NumberToStringWithFixedPrecision(magnitude.InPiBF(), 3), "PiB"});
} else if (bytes > kOneTiB) {
StrAppend(
dest,
{NumberToStringWithFixedPrecision(magnitude.InTiBF(), 3), "TiB"});
} else if (bytes > kOneGiB) {
StrAppend(
dest,
{NumberToStringWithFixedPrecision(magnitude.InGiBF(), 3), "GiB"});
} else if (bytes > kOneMiB) {
StrAppend(
dest,
{NumberToStringWithFixedPrecision(magnitude.InMiBF(), 3), "MiB"});
} else {
StrAppend(
dest,
{NumberToStringWithFixedPrecision(magnitude.InKiBF(), 3), "KiB"});
}
StrAppend(dest, {")"});
}
}
}
} // namespace
std::ostream& operator<<(std::ostream& os, ByteSize size) {
// If it's exactly 0 then stream and return.
if (size.is_zero()) {
return os << "0B";
}
// Reserve enough space (e.g. "1152920504606846976B (1023.999PiB)" which is
// a full 64-bit value with four digits before the decimal).
std::string result;
result.reserve(34);
AppendMagnitude(&result, size);
return os << result;
}
std::ostream& operator<<(std::ostream& os, ByteSizeDelta delta) {
// If it's exactly 0 then stream and return.
if (delta.is_zero()) {
return os << "0B";
}
// 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 (delta.is_min()) {
return os << "-8EiB";
}
// 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);
// Format that magnitude, with negative signs prepended if necessary.
AppendMagnitude(&result, delta.Magnitude(), delta.is_negative() ? "-" : "");
return os << result;
}
} // namespace base
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