mbtk/libmbtk_coap/mbtk_coap_pdu.h

#ifndef __MBTK_COAP_H__
#define __MBTK_COAP_H__
#include <stdint.h>
//#include "ps_in.h"
#include "ds_ASBuffer.h"
#include "mbtk_type.h"

#define COAP_HDR_SIZE 4
#define COAP_OPTION_HDR_BYTE 1

typedef unsigned char               uint8_t;
typedef unsigned short              uint16_t;
//typedef unsigned long               uint32_t;
typedef unsigned long long          uint64_t;

/*
enum ds_appsrv_mem_e_type { APPSRV_MEM };

void* operator new(unsigned int size, void* alloc, ds_appsrv_mem_e_type mem_type) throw();
void  operator delete(void* obj, void* alloc, ds_appsrv_mem_e_type mem_type) throw();
*/

#define ps_ntohs(x)                                                      \
          (((((uint16)(x) & 0x00FF) << 8) | (((uint16)(x) & 0xFF00) >> 8)))


#define endian_be16(x) ps_ntohs(x)

#define endian_load16(cast, from) ((cast)( \
        (((uint16_t)((uint8_t*)(from))[0]) << 8) | \
        (((uint16_t)((uint8_t*)(from))[1])     ) ))

#define endian_load32(cast, from) ((cast)( \
        (((uint32_t)((uint8_t*)(from))[0]) << 24) | \
        (((uint32_t)((uint8_t*)(from))[1]) << 16) | \
        (((uint32_t)((uint8_t*)(from))[2]) <<  8) | \
        (((uint32_t)((uint8_t*)(from))[3])      ) ))

#define endian_load64(cast, from) ((cast)( \
        (((uint64_t)((uint8_t*)(from))[0]) << 56) | \
        (((uint64_t)((uint8_t*)(from))[1]) << 48) | \
        (((uint64_t)((uint8_t*)(from))[2]) << 40) | \
        (((uint64_t)((uint8_t*)(from))[3]) << 32) | \
        (((uint64_t)((uint8_t*)(from))[4]) << 24) | \
        (((uint64_t)((uint8_t*)(from))[5]) << 16) | \
        (((uint64_t)((uint8_t*)(from))[6]) << 8)  | \
        (((uint64_t)((uint8_t*)(from))[7])     )  ))

#define endian_store16(to, num) \
    do { uint16_t val = endian_be16(num); memcpy(to, &val, 2); } while(0)

// CoAP PDU format

//   0                   1                   2                   3
//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// |Ver| T |  TKL  |      Code     |          Message ID           |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// |   Token (if any, TKL bytes) ...
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// |   Options (if any) ...
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// |1 1 1 1 1 1 1 1|    Payload (if any) ...
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

class CoapPDU
{


public:
    /// CoAP message types. Note, values only work as enum.
    enum Type
    {
        COAP_CONFIRMABLE=0x00,
        COAP_NON_CONFIRMABLE=0x10,
        COAP_ACKNOWLEDGEMENT=0x20,
        COAP_RESET=0x30
    };

    // CoAP response codes.
    enum Code
    {
        COAP_EMPTY=0x00,
        COAP_GET,
        COAP_POST,
        COAP_PUT,
        COAP_DELETE,
        COAP_LASTMETHOD=0x1F,
        COAP_CREATED=0x41,
        COAP_DELETED,
        COAP_VALID,
        COAP_CHANGED,
        COAP_CONTENT,
        COAP_CONTINUE=0x5F,
        COAP_BAD_REQUEST=0x80,
        COAP_UNAUTHORIZED,
        COAP_BAD_OPTION,
        COAP_FORBIDDEN,
        COAP_NOT_FOUND,
        COAP_METHOD_NOT_ALLOWED,
        COAP_NOT_ACCEPTABLE,
        COAP_PRECONDITION_FAILED=0x8C,
        COAP_REQUEST_ENTITY_TOO_LARGE=0x8D,
        COAP_UNSUPPORTED_CONTENT_FORMAT=0x8F,
        COAP_INTERNAL_SERVER_ERROR=0xA0,
        COAP_NOT_IMPLEMENTED,
        COAP_BAD_GATEWAY,
        COAP_SERVICE_UNAVAILABLE,
        COAP_GATEWAY_TIMEOUT,
        COAP_PROXYING_NOT_SUPPORTED,
        COAP_UNDEFINED_CODE=0xFF
    };

    /// CoAP option numbers.
    enum Option
    {
        COAP_OPTION_IF_MATCH=1,
        COAP_OPTION_URI_HOST=3,
        COAP_OPTION_ETAG,
        COAP_OPTION_IF_NONE_MATCH,
        COAP_OPTION_OBSERVE,
        COAP_OPTION_URI_PORT,
        COAP_OPTION_LOCATION_PATH,
        COAP_OPTION_URI_PATH=11,
        COAP_OPTION_CONTENT_FORMAT,
        COAP_OPTION_MAX_AGE=14,
        COAP_OPTION_URI_QUERY,
        COAP_OPTION_ACCEPT=17,
        COAP_OPTION_LOCATION_QUERY=20,
        COAP_OPTION_BLOCK2=23,
        COAP_OPTION_BLOCK1=27,
        COAP_OPTION_SIZE2,
        COAP_OPTION_PROXY_URI=35,
        COAP_OPTION_PROXY_SCHEME=39,
        COAP_OPTION_SIZE1=60
    };

    /// CoAP content-formats.
    enum ContentFormat
    {
        COAP_CONTENT_FORMAT_TEXT_PLAIN = 0,
        COAP_CONTENT_FORMAT_APP_LINK  = 40,
        COAP_CONTENT_FORMAT_APP_XML,
        COAP_CONTENT_FORMAT_APP_OCTET,
        COAP_CONTENT_FORMAT_APP_EXI   = 47,
        COAP_CONTENT_FORMAT_APP_JSON  = 50
    };

    /// Sequence of these is returned by CoapPDU::getOptions()
    struct CoapOption
    {
        uint16_t optionDelta;
        uint16_t optionNumber;
        uint16_t optionValueLength;
        int totalLength;
        uint8_t *optionPointer;
        uint8_t *optionValuePointer;
    };

    // construction and destruction
    CoapPDU();
    CoapPDU(uint8_t *buffer, int bufferLength, int pduLength);
    ~CoapPDU();
    int reset();
    int validate();

    // version
    int setVersion(uint8_t version);
    uint8_t getVersion();

    // message type
    void setType(int type);
    int getType();

    // tokens
    int setTokenLength(uint8_t tokenLength);
    int getTokenLength();
    uint8_t* getTokenPointer();
    int setToken(uint8_t *token, uint8_t tokenLength);

    // message code
    void setCode(int code);
    int getCode();
    int httpStatusToCode(int httpStatus);

    // message ID
    int setMessageID(uint16_t messageID);
    uint16_t getMessageID();

    // options
    int addOption(uint16_t optionNumber, uint16_t optionLength, uint8_t *optionValue);
    // gets a list of all options
    CoapOption* getOptions();
    int getNumOptions();
    // shorthand helpers
    int setURI(char *uri);
    int setURI(char *uri, int urilen);
    int getURI(char *dst, int dstlen, int *outLen);
    int addURIQuery(char *query);

    // content format helper
    int setContentFormat(int format);

    // payload
    uint8_t* mallocPayload(int bytes);
    int setPayload(uint8_t *value, int len);
    uint8_t* getPayloadPointer();
    int getPayloadLength();
    uint8_t* getPayloadCopy();

    // pdu
    int getPDULength();
    uint8_t* getPDUPointer();
    void setPDULength(int len);
    void getOptionValueById(uint16_t optionNumber, uint16_t *optionValueLength,uint8_t *optionValuePointer);
    const char *printHuman();
    const char * printHex();
    int hasOption(uint16_t optionNumber);
private:
    // variables
    uint8_t *_pdu;
    int _pduLength;

    int _constructedFromBuffer;
    int _bufferLength;

    uint8_t *_payloadPointer;
    int _payloadLength;

    int _numOptions;
    uint16_t _maxAddedOptionNumber;
    ASBuffer content;

    // functions
    void shiftPDUUp(int shiftOffset, int shiftAmount);
    void shiftPDUDown(int startLocation, int shiftOffset, int shiftAmount);
    uint8_t codeToValue(int c);

    // option stuff
    int findInsertionPosition(uint16_t optionNumber, uint16_t *prevOptionNumber);
    int computeExtraBytes(uint16_t n);
    int insertOption(int insertionPosition, uint16_t optionDelta, uint16_t optionValueLength, uint8_t *optionValue);
    uint16_t getOptionDelta(uint8_t *option);
    void setOptionDelta(int optionPosition, uint16_t optionDelta);
    uint16_t getOptionValueLength(uint8_t *option);

};

/*
#define COAP_CODE_EMPTY 0x00

// method codes 0.01-0.31
#define COAP_CODE_GET   0x01
#define COAP_CODE_POST  0x02
#define COAP_CODE_PUT   0x03
#define COAP_CODE_DELETE 0x04

// Response codes 2.00 - 5.31
// 2.00 - 2.05
#define COAP_CODE_CREATED 0x41
#define COAP_CODE_DELETED 0x42
#define COAP_CODE_VALID   0x43
#define COAP_CODE_CHANGED 0x44
#define COAP_CODE_CONTENT 0x45

// 4.00 - 4.15
#define COAP_CODE_BAD_REQUEST                0x80
#define COAP_CODE_UNAUTHORIZED               0x81
#define COAP_CODE_BAD_OPTION                 0x82
#define COAP_CODE_FORBIDDEN                  0x83
#define COAP_CODE_NOT_FOUND                  0x84
#define COAP_CODE_METHOD_NOT_ALLOWED         0x85
#define COAP_CODE_NOT_ACCEPTABLE             0x86
#define COAP_CODE_PRECONDITION_FAILED        0x8C
#define COAP_CODE_REQUEST_ENTITY_TOO_LARGE   0x8D
#define COAP_CODE_UNSUPPORTED_CONTENT_FORMAT 0x8F

// 5.00 - 5.05
#define COAP_CODE_INTERNAL_SERVER_ERROR      0xA0
#define COAP_CODE_NOT_IMPLEMENTED            0xA1
#define COAP_CODE_BAD_GATEWAY                0xA2
#define COAP_CODE_SERVICE_UNAVAILABLE        0xA3
#define COAP_CODE_GATEWAY_TIMEOUT            0xA4
#define COAP_CODE_PROXYING_NOT_SUPPORTED     0xA5
*/

#endif