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// util/hex.h
/**
* 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.
*/
#pragma once
#include <algorithm>
#include <cctype>
#include <string>
#include "mongo/base/string_data.h"
#include "mongo/bson/util/builder.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
// can't use hex namespace because it conflicts with hex iostream function
inline StatusWith<char> fromHex(char c) {
if ('0' <= c && c <= '9')
return c - '0';
if ('a' <= c && c <= 'f')
return c - 'a' + 10;
if ('A' <= c && c <= 'F')
return c - 'A' + 10;
return Status(ErrorCodes::FailedToParse,
str::stream() << "The character " << c << " failed to parse from hex.");
}
inline StatusWith<char> fromHex(const char* c) {
if (fromHex(c[0]).isOK() && fromHex(c[1]).isOK()) {
return (char)((fromHex(c[0]).getValue() << 4) | fromHex(c[1]).getValue());
}
return Status(ErrorCodes::FailedToParse,
str::stream() << "The character " << c[0] << c[1]
<< " failed to parse from hex.");
}
inline StatusWith<char> fromHex(StringData c) {
if (fromHex(c[0]).isOK() && fromHex(c[1]).isOK()) {
return (char)((fromHex(c[0]).getValue() << 4) | fromHex(c[1]).getValue());
}
return Status(ErrorCodes::FailedToParse,
str::stream() << "The character " << c[0] << c[1]
<< " failed to parse from hex.");
}
/**
* Decodes 'hexString' into raw bytes, appended to the out parameter 'buf'. Callers must first
* ensure that 'hexString' is a valid hex encoding.
*/
inline void fromHexString(StringData hexString, BufBuilder* buf) {
invariant(hexString.size() % 2 == 0);
// Combine every pair of two characters into one byte.
for (std::size_t i = 0; i < hexString.size(); i += 2) {
buf->appendChar(uassertStatusOK(fromHex(StringData(&hexString.rawData()[i], 2))));
}
}
/**
* Returns true if 'hexString' is a valid hexadecimal encoding.
*/
inline bool isValidHex(StringData hexString) {
// There must be an even number of characters, since each pair encodes a single byte.
return hexString.size() % 2 == 0 &&
std::all_of(hexString.begin(), hexString.end(), [](char c) { return std::isxdigit(c); });
}
inline std::string toHex(const void* inRaw, int len) {
static const char hexchars[] = "0123456789ABCDEF";
StringBuilder out;
const char* in = reinterpret_cast<const char*>(inRaw);
for (int i = 0; i < len; ++i) {
char c = in[i];
char hi = hexchars[(c & 0xF0) >> 4];
char lo = hexchars[(c & 0x0F)];
out << hi << lo;
}
return out.str();
}
template <typename T>
std::string integerToHex(T val);
inline std::string toHexLower(const void* inRaw, int len) {
static const char hexchars[] = "0123456789abcdef";
StringBuilder out;
const char* in = reinterpret_cast<const char*>(inRaw);
for (int i = 0; i < len; ++i) {
char c = in[i];
char hi = hexchars[(c & 0xF0) >> 4];
char lo = hexchars[(c & 0x0F)];
out << hi << lo;
}
return out.str();
}
/**
* Returns the hex value with a fixed width of 8 chatacters.
*/
std::string unsignedIntToFixedLengthHex(uint32_t val);
/* @return a dump of the buffer as hex byte ascii output */
std::string hexdump(const char* data, unsigned len);
}
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