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/**
* Copyright (C) 2019-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/util/stacktrace_json.h"
#include <cctype>
#include "mongo/bson/bsonobj.h"
#include "mongo/util/assert_util.h"
namespace mongo::stack_trace_detail {
namespace {
template <size_t base>
StringData kDigits;
template <>
constexpr StringData kDigits<16> = "0123456789ABCDEF"_sd;
template <>
constexpr StringData kDigits<10> = "0123456789"_sd;
template <size_t base, typename Buf>
StringData toNumericBase(uint64_t x, Buf& buf, bool showBase) {
auto it = buf.rbegin();
if (!x) {
*it++ = '0';
} else {
for (; x; ++it) {
*it = kDigits<base>[x % base];
x /= base;
}
// base is prepended only when x is nonzero (matching printf)
if (base == 16 && showBase) {
static const auto kPrefix = "0x"_sd;
it = std::reverse_copy(kPrefix.begin(), kPrefix.end(), it);
}
}
size_t n = std::distance(it.base(), buf.end());
const char* p = buf.data() + buf.size() - n;
return StringData(p, n);
}
} // namespace
StringData Dec::toDec(uint64_t x, Buf& buf) {
return toNumericBase<10>(x, buf, false);
}
StringData Hex::toHex(uint64_t x, Buf& buf, bool showBase) {
return toNumericBase<16>(x, buf, showBase);
}
uint64_t Hex::fromHex(StringData s) {
uint64_t x = 0;
for (char c : s) {
char uc = std::toupper(static_cast<unsigned char>(c));
if (size_t pos = kDigits<16>.find(uc); pos == std::string::npos) {
return x;
} else {
x <<= 4;
x += pos;
}
}
return x;
}
} // namespace mongo::stack_trace_detail
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