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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/dns_util.h"
#include <cstring>
namespace net {
// Based on DJB's public domain code.
bool DNSDomainFromDot(const std::string& dotted, std::string* out) {
const char* buf = dotted.data();
unsigned n = dotted.size();
char label[63];
unsigned int labellen = 0; /* <= sizeof label */
char name[255];
unsigned int namelen = 0; /* <= sizeof name */
char ch;
for (;;) {
if (!n)
break;
ch = *buf++;
--n;
if (ch == '.') {
if (labellen) {
if (namelen + labellen + 1 > sizeof name)
return false;
name[namelen++] = labellen;
memcpy(name + namelen, label, labellen);
namelen += labellen;
labellen = 0;
}
continue;
}
if (labellen >= sizeof label)
return false;
label[labellen++] = ch;
}
if (labellen) {
if (namelen + labellen + 1 > sizeof name)
return false;
name[namelen++] = labellen;
memcpy(name + namelen, label, labellen);
namelen += labellen;
labellen = 0;
}
if (namelen + 1 > sizeof name)
return false;
name[namelen++] = 0; // This is the root label (of length 0).
*out = std::string(name, namelen);
return true;
}
bool IsSTD3ASCIIValidCharacter(char c) {
if (c <= 0x2c)
return false;
if (c >= 0x7b)
return false;
if (c >= 0x2e && c <= 0x2f)
return false;
if (c >= 0x3a && c <= 0x40)
return false;
if (c >= 0x5b && c <= 0x60)
return false;
return true;
}
std::string TrimEndingDot(const std::string& host) {
std::string host_trimmed = host;
size_t len = host_trimmed.length();
if (len > 1 && host_trimmed[len - 1] == '.')
host_trimmed.erase(len - 1);
return host_trimmed;
}
} // namespace net
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