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// Copyright (C) 2010 Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
// $Id$
#include <cassert>
#include <iterator>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <exceptions/exceptions.h>
#include <boost/foreach.hpp>
#include <ctype.h>
#include <stdint.h>
#include <dns/hex.h>
using namespace std;
namespace isc {
namespace dns {
namespace {
const char hexdigits[] = "0123456789ABCDEF";
}
std::string
encodeHex(const std::vector<uint8_t>& binary) {
// calculate the resulting length. it should be twice the
// original data length
const size_t len = (binary.size() * 2);
std::ostringstream hex;
BOOST_FOREACH(uint8_t octet, binary) {
hex << hexdigits[octet >> 4] << hexdigits[octet & 0xf];
}
assert(len >= hex.str().length());
return (hex.str());
}
void
decodeHex(const std::string& hex, std::vector<uint8_t>& result) {
ostringstream comp;
// compress input by removing whitespace
const size_t len = hex.length();
for (int i = 0; i < len; ++i) {
char c = hex.at(i);
if (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
continue;
}
comp << c;
}
istringstream iss(comp.str());
result.clear();
char c1, c2;
iss.width(1);
if ((comp.str().length() % 2) == 1) {
c2 = '0';
iss >> c2;
const char* pos = strchr(hexdigits, toupper(c2));
if (pos == NULL) {
isc_throw(BadHexString, "Invalid hex digit");
}
if (!iss.eof() && !iss.bad() && !iss.fail()) {
result.push_back(pos - hexdigits);
}
}
while (!iss.eof()) {
c1 = c2 = '0';
iss >> c1 >> c2;;
if (iss.eof() || iss.fail() || iss.bad()) {
break;
}
const char* pos1 = strchr(hexdigits, toupper(c1));
const char* pos2 = strchr(hexdigits, toupper(c2));
if (!pos1 || !pos2) {
isc_throw(BadHexString, "Invalid hex digit");
}
const uint8_t n = ((pos1 - hexdigits) << 4) | (pos2 - hexdigits);
result.push_back(n);
}
}
}
}
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