UID.h

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/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * UID.h
 * Representation of an RDM UID
 * Copyright (C) 2005-2010 Simon Newton
 */

#ifndef INCLUDE_OLA_RDM_UID_H_
#define INCLUDE_OLA_RDM_UID_H_

#include <stdint.h>
#include <iomanip>
#include <sstream>
#include <string>

namespace ola {
namespace rdm {

using std::ostream;
using std::string;

class UID {
 public:
 UID(uint16_t esta_id, uint32_t device_id) {
 m_uid.esta_id = esta_id;
 m_uid.device_id = device_id;
 }

 UID(const UID &uid) {
 m_uid.esta_id = uid.m_uid.esta_id;
 m_uid.device_id = uid.m_uid.device_id;
 }

 explicit UID(const uint8_t *data) {
 m_uid.esta_id = static_cast<uint16_t>((data[0] << 8) + data[1]);
 m_uid.device_id = static_cast<uint32_t>(data[2] << 24) +
 static_cast<uint32_t>(data[3] << 16) +
 static_cast<uint32_t>(data[4] << 8) +
 data[5];
 }

 UID& operator=(const UID& other) {
 if (this != &other) {
 m_uid.esta_id = other.m_uid.esta_id;
 m_uid.device_id = other.m_uid.device_id;
 }
 return *this;
 }

 bool operator==(const UID &other) const {
 return 0 == cmp(*this, other);
 }

 bool operator!=(const UID &other) const {
 return 0 != cmp(*this, other);
 }

 bool operator>(const UID &other) const {
 return cmp(*this, other) > 0;
 }

 bool operator<(const UID &other) const {
 return cmp(*this, other) < 0;
 }

 uint16_t ManufacturerId() const { return m_uid.esta_id; }

 uint32_t DeviceId() const { return m_uid.device_id; }

 bool IsBroadcast() const { return m_uid.device_id == ALL_DEVICES; }

 bool DirectedToUID(const UID &uid) const {
 return *this == uid ||
 (IsBroadcast() &&
 (ManufacturerId() == ALL_MANUFACTURERS ||
 ManufacturerId() == uid.ManufacturerId()));
 }

 std::string ToString() const {
 std::stringstream str;
 str << std::setfill('0') << std::setw(4) << std::hex << m_uid.esta_id
 << ":" << std::setw(8) << m_uid.device_id;
 return str.str();
 }

 friend ostream& operator<< (ostream &out, const UID &uid) {
 return out << uid.ToString();
 }

 bool Pack(uint8_t *buffer, unsigned int length) const {
 if (length < UID_SIZE)
 return false;
 buffer[0] = static_cast<uint8_t>(m_uid.esta_id >> 8);
 buffer[1] = static_cast<uint8_t>(m_uid.esta_id & 0xff);
 buffer[2] = static_cast<uint8_t>(m_uid.device_id >> 24);
 buffer[3] = static_cast<uint8_t>(m_uid.device_id >> 16);
 buffer[4] = static_cast<uint8_t>(m_uid.device_id >> 8);
 buffer[5] = static_cast<uint8_t>(m_uid.device_id & 0xff);
 return true;
 }

 static UID AllDevices() {
 return UID(ALL_MANUFACTURERS, ALL_DEVICES);
 }

 static UID VendorcastAddress(uint16_t esta_id) {
 return UID(esta_id, ALL_DEVICES);
 }

 static UID VendorcastAddress(UID uid) {
 return UID(uid.ManufacturerId(), ALL_DEVICES);
 }

 static UID* FromString(const string &uid);

 enum {
 UID_SIZE = 6 
 };

 static const uint16_t ALL_MANUFACTURERS = 0xffff;

 static const uint32_t ALL_DEVICES = 0xffffffff;

 private:
 struct rdm_uid {
 uint16_t esta_id;
 uint32_t device_id;
 };

 struct rdm_uid m_uid;

 int cmp(const UID &a, const UID &b) const {
 if (a.m_uid.esta_id == b.m_uid.esta_id)
 return cmp(a.m_uid.device_id, b.m_uid.device_id);
 return cmp(a.m_uid.esta_id, b.m_uid.esta_id);
 }

 int cmp(uint32_t a, uint32_t b) const {
 if (a == b)
 return 0;
 return a < b ? -1 : 1;
 }
};
} // namespace rdm
} // namespace ola
#endif // INCLUDE_OLA_RDM_UID_H_