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/**
* Copyright (C) 2018-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/hex.h"
#include <algorithm>
#include <fmt/format.h>
#include <iterator>
#include <string>
#include "mongo/base/error_codes.h"
#include "mongo/util/ctype.h"
namespace mongo {
namespace {
using namespace fmt::literals;
constexpr StringData kHexUpper = "0123456789ABCDEF"_sd;
constexpr StringData kHexLower = "0123456789abcdef"_sd;
std::string _hexPack(StringData data, StringData hexchars) {
std::string out;
out.reserve(2 * data.size());
for (auto c : data) {
out.append({hexchars[(c & 0xF0) >> 4], hexchars[(c & 0x0F)]});
}
return out;
}
template <typename F>
void _decode(StringData s, const F& f) {
uassert(ErrorCodes::FailedToParse, "Hex blob with odd digit count", s.size() % 2 == 0);
for (std::size_t i = 0; i != s.size(); i += 2)
f(hexblob::decodePair(s.substr(i, 2)));
}
} // namespace
namespace hexblob {
unsigned char decodeDigit(unsigned char c) {
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
uasserted(ErrorCodes::FailedToParse,
"The character \\x{:02x} failed to parse from hex."_format(c));
}
unsigned char decodePair(StringData c) {
uassert(ErrorCodes::FailedToParse, "Need two hex digits", c.size() == 2);
return (decodeDigit(c[0]) << 4) | decodeDigit(c[1]);
}
bool validate(StringData s) {
// There must be an even number of characters, since each pair encodes a single byte.
return s.size() % 2 == 0 &&
std::all_of(s.begin(), s.end(), [](auto c) { return ctype::isXdigit(c); });
}
std::string encode(StringData data) {
return _hexPack(data, kHexUpper);
}
std::string encodeLower(StringData data) {
return _hexPack(data, kHexLower);
}
void decode(StringData s, BufBuilder* buf) {
_decode(s, [&](unsigned char c) { buf->appendChar(c); });
}
std::string decode(StringData s) {
std::string r;
r.reserve(s.size() / 2);
_decode(s, [&](unsigned char c) { r.push_back(c); });
return r;
}
} // namespace hexblob
std::string hexdump(StringData data) {
verify(data.size() < 1000000);
std::string out;
out.reserve(3 * data.size());
char sep = 0;
for (auto c : data) {
if (sep)
out.push_back(sep);
out.append({kHexLower[(c & 0xF0) >> 4], kHexLower[(c & 0x0F)]});
sep = ' ';
}
return out;
}
} // namespace mongo
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