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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 "config.h"
#include <stdint.h>
#include <string.h>
#include <string>
#include <vector>
#include "buffer.h"
#include "messagerenderer.h"
#include "rdata.h"
#include "rdataclass.h"
using namespace std;
// BEGIN_ISC_NAMESPACE
// BEGIN_RDATA_NAMESPACE
TXT::TXT(InputBuffer& buffer, size_t rdata_len) {
if (rdata_len > MAX_RDLENGTH) {
isc_throw(InvalidRdataLength, "RDLENGTH too large: " << rdata_len);
}
if (rdata_len == 0) { // note that this couldn't happen in the loop.
isc_throw(DNSMessageFORMERR,
"Error in parsing TXT RDATA: 0-length character string");
}
do {
const uint8_t len = buffer.readUint8();
if (rdata_len < len + 1) {
isc_throw(DNSMessageFORMERR,
"Error in parsing TXT RDATA: character string length "
"is too large: " << static_cast<int>(len));
}
vector<uint8_t> data(len + 1);
data[0] = len;
buffer.readData(&data[0] + 1, len);
string_list_.push_back(data);
rdata_len -= (len + 1);
} while (rdata_len > 0);
}
TXT::TXT(const std::string& txtstr) {
// TBD: this is a simple, incomplete implementation that only supports
// a single character-string.
size_t length = txtstr.size();
size_t pos_begin = 0;
if (length > 1 && txtstr[0] == '"' && txtstr[length - 1] == '"') {
pos_begin = 1;
length -= 2;
}
if (length > MAX_CHARSTRING_LEN) {
isc_throw(CharStringTooLong, "TXT RDATA construction from text: "
"string length is too long: " << length);
}
// TBD: right now, we don't support escaped characters
if (txtstr.find('\\') != string::npos) {
isc_throw(InvalidRdataText, "TXT RDATA from text: "
"escaped character is currently not supported: " << txtstr);
}
vector<uint8_t> data;
data.reserve(length + 1);
data.push_back(length);
data.insert(data.end(), txtstr.begin() + pos_begin,
txtstr.begin() + pos_begin + length);
string_list_.push_back(data);
}
TXT::TXT(const TXT& other) :
Rdata(), string_list_(other.string_list_)
{}
void
TXT::toWire(OutputBuffer& buffer) const {
for (vector<vector<uint8_t> >::const_iterator it = string_list_.begin();
it != string_list_.end();
++it)
{
buffer.writeData(&(*it)[0], (*it).size());
}
}
void
TXT::toWire(MessageRenderer& renderer) const {
for (vector<vector<uint8_t> >::const_iterator it = string_list_.begin();
it != string_list_.end();
++it)
{
renderer.writeData(&(*it)[0], (*it).size());
}
}
string
TXT::toText() const {
string s;
// XXX: this implementation is not entirely correct. for example, it
// should escape double-quotes if they appear in the character string.
for (vector<vector<uint8_t> >::const_iterator it = string_list_.begin();
it != string_list_.end();
++it)
{
if (!s.empty()) {
s.push_back(' ');
}
s.push_back('"');
s.insert(s.end(), (*it).begin() + 1, (*it).end());
s.push_back('"');
}
return (s);
}
int
TXT::compare(const Rdata& other) const {
const TXT& other_txt = dynamic_cast<const TXT&>(other);
// This implementation is not efficient. Revisit this (TBD).
OutputBuffer this_buffer(0);
toWire(this_buffer);
size_t this_len = this_buffer.getLength();
OutputBuffer other_buffer(0);
other_txt.toWire(other_buffer);
const size_t other_len = other_buffer.getLength();
const size_t cmplen = min(this_len, other_len);
const int cmp = memcmp(this_buffer.getData(), other_buffer.getData(),
cmplen);
if (cmp != 0) {
return (cmp);
} else {
return ((this_len == other_len) ? 0 :
(this_len < other_len) ? -1 : 1);
}
}
// END_RDATA_NAMESPACE
// END_ISC_NAMESPACE
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