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// util/hex.cpp
/**
* 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 <iomanip>
#include <sstream>
#include <string>
namespace mongo {
template <typename T>
std::string integerToHexDef(T inInt) {
if (!inInt)
return "0";
static const char hexchars[] = "0123456789ABCDEF";
static const size_t outbufSize = sizeof(T) * 2 + 1;
char outbuf[outbufSize];
outbuf[outbufSize - 1] = '\0';
char c;
int lastSeenNumber = 0;
for (int j = int(outbufSize) - 2; j >= 0; j--) {
c = hexchars[inInt & 0xF];
if (c != '0')
lastSeenNumber = j;
outbuf[j] = c;
inInt = inInt >> 4;
}
char* bufPtr = outbuf;
bufPtr += lastSeenNumber;
return std::string(bufPtr);
}
template <>
std::string integerToHex<char>(char val) {
return integerToHexDef(val);
}
template <>
std::string integerToHex<int>(int val) {
return integerToHexDef(val);
}
template <>
std::string integerToHex<unsigned int>(unsigned int val) {
return integerToHexDef(val);
}
template <>
std::string integerToHex<long>(long val) {
return integerToHexDef(val);
}
template <>
std::string integerToHex<unsigned long>(unsigned long val) {
return integerToHexDef(val);
}
template <>
std::string integerToHex<long long>(long long val) {
return integerToHexDef(val);
}
template <>
std::string integerToHex<unsigned long long>(unsigned long long val) {
return integerToHexDef(val);
}
std::string unsignedIntToFixedLengthHex(uint32_t val) {
char buf[9];
invariant(snprintf(buf, 9, "%08X", val) == 8);
return std::string(buf, 8);
}
std::string hexdump(const char* data, unsigned len) {
verify(len < 1000000);
const unsigned char* p = (const unsigned char*)data;
std::stringstream ss;
ss << std::hex << std::setfill('0');
for (unsigned i = 0; i < len; i++) {
ss << std::setw(2) << static_cast<unsigned>(p[i]) << ' ';
}
std::string s = ss.str();
return s;
}
}
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