#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>

#include <iiimp-data.h>
#include <iiimp-opcode.h>

#include "iiimp-dataP.h"


IIIMP_message *
iiimp_connect_new(
    IIIMP_data_s *	data_s,
    IIIMP_string *	user_name,
    IIIMP_string *	auth)
{
    IIIMP_message *	m;
    int			i;
    m = (IIIMP_message *)malloc(sizeof (IIIMP_message));
    if (NULL == m) {
	data_s->status = IIIMP_DATA_MALLOC_ERROR;
	return NULL;
    }
    m->opcode = IM_CONNECT;
    m->im_id = -1;
    m->ic_id = -1;
    i = 1;
    m->v.connect.byte_order = ((0x01 == *((char *)(&i))) ?
			       IM_CONNECT_LITTLE_ENDIAN :
			       IM_CONNECT_BIG_ENDIAN);
    m->v.connect.protocol_version = data_s->protocol_version;
    m->v.connect.user_name = user_name;
    m->v.connect.auth = auth;
    return m;
}


void
iiimp_connect_delete(IIIMP_data_s * data_s, IIIMP_message * m)
{
    if (NULL == m) return;
    iiimp_string_delete(data_s, m->v.connect.user_name);
    iiimp_string_list_delete(data_s, m->v.connect.auth);
    free(m);
    return;
}


uchar_t *
iiimp_connect_pack(
    IIIMP_data_s *	data_s,
    IIIMP_string *	user_name,
    IIIMP_string *	auth_protocol,
    size_t *		buf_size)
{
    size_t		nbyte;
    int			length;
    uchar_t *		buf;
    size_t		rest;
    uchar_t *		p;
    IIIMP_card8		byte_order;
    int			i;
    IIIMP_string *	a;
    size_t		auth_nbyte;

    nbyte = 0;
    nbyte += (1 + 1);		/* byte order + protocol version */
    nbyte += user_name->nbyte;	/* user name */
    nbyte += 2;			/* byte length of client auth protocol names */
    for (auth_nbyte = 0, a = auth_protocol; NULL != a; a = a->next) {
	auth_nbyte += a->nbyte;
    }
    nbyte += auth_nbyte;	/* client auth protocol names */

    length = (nbyte >> 2);
    *buf_size = (1 + 3 + nbyte);

    buf = (uchar_t *)malloc(1 + 3 + nbyte);
    if (NULL == buf) {
	data_s->status = IIIMP_DATA_MALLOC_ERROR;
	return NULL;
    }

    PUT_PACKET_HEADER(buf, IM_CONNECT, length);

    rest = nbyte;
    p = (buf + 4);

    i = 1;
    byte_order = ((0x01 == *((char *)(&i))) ?
		  IM_CONNECT_LITTLE_ENDIAN :
		  IM_CONNECT_BIG_ENDIAN);

    PUTU8(byte_order, rest, p, data_s->byte_swap);
    PUTU8(data_s->protocol_version, rest, p, data_s->byte_swap);
    iiimp_string_pack(data_s, user_name, &rest, &p);
    PUTU16(auth_nbyte, rest, p, data_s->byte_swap);
    iiimp_string_list_pack(data_s, auth_protocol, &rest, &p);

    return buf;
}


IIIMP_message *
iiimp_connect_unpack(
    IIIMP_data_s *	data_s,
    IIIMP_card7		opcode,
    size_t *		nbyte,
    const uchar_t **	ptr)
{
    IIIMP_message *	m;
    IIIMP_connect_v *	v;
    size_t		rest;
    const uchar_t *	p;
    int			len;
    int			endian;
    int			protocol_version;

    rest = *nbyte;
    p = *ptr;

    if (rest < (1 + 1 + 4 + 2)) {
	data_s->status = IIIMP_DATA_INVALID;
	return NULL;
    }

    m = (IIIMP_message *)malloc(sizeof (IIIMP_message));
    if (NULL == m) {
	data_s->status = IIIMP_DATA_MALLOC_ERROR;
	return NULL;
    }
    v = &(m->v.connect);

    m->opcode = opcode;
    m->im_id = -1;
    m->ic_id = -1;
    v->user_name = NULL;
    v->auth = NULL;

    GETU8(v->byte_order, rest, p, 0);
    endian = 0x01;
    if (0x01 == (*(uchar_t *)(&endian))) {
	/* little endian */
	if (IM_CONNECT_BIG_ENDIAN == v->byte_order) {
	    data_s->byte_swap = 1;
	} else {
	    data_s->byte_swap = 0;
	}
    } else {
	/* big endian */
	if (IM_CONNECT_BIG_ENDIAN == v->byte_order) {
	    data_s->byte_swap = 0;
	} else {
	    data_s->byte_swap = 1;
	}
    }
    if ((IM_CONNECT_BIG_ENDIAN != v->byte_order) &&
	(IM_CONNECT_LITTLE_ENDIAN != v->byte_order)) {
	free(m);
	data_s->status = IIIMP_DATA_INVALID;
	return NULL;
    }

    GETU8(v->protocol_version, rest, p, data_s->byte_swap);

    if (v->protocol_version == 0x31) {
	/* Unfortunately, some old client sends '1'(0x31)
	   as a version number.   We regard it as version 1.  */
	protocol_version = 1;
    } else {
	protocol_version = v->protocol_version;
    }

    if (protocol_version < data_s->protocol_version) {
	/* If the requested version is lower than the supported version,
	   downgrade it.  */
	data_s->protocol_version = protocol_version;
    }

    v->user_name = iiimp_string_unpack(data_s, &rest, &p, rest);
    if ((NULL == v->user_name) || (rest < 2)) {
	iiimp_connect_delete(data_s, m);
	return NULL;
    }

    GETU16(len, rest, p, data_s->byte_swap);
    if ((len < 0) || (rest < len)) {
	iiimp_connect_delete(data_s, m);
	data_s->status = IIIMP_DATA_INVALID;
	return NULL;
    }
    if (0 < len) {
	v->auth = iiimp_string_list_unpack(data_s, &rest, &p, len);
	if (NULL == v->auth) {
	    iiimp_connect_delete(data_s, m);
	    return NULL;
	}
    }

    return m;
}


void
iiimp_connect_print(
    IIIMP_data_s *	data_s,
    IIIMP_message *	m)
{
    IIIMP_connect_v *	v;

    v = &(m->v.connect);

    iiimp_message_header_print(data_s, m->opcode, -1, -1);

    switch (v->byte_order) {
    case IM_CONNECT_BIG_ENDIAN:
	(void)fprintf(data_s->print_fp, "\t%s\n", "big endian");
	break;
    case IM_CONNECT_LITTLE_ENDIAN:
	(void)fprintf(data_s->print_fp, "\t%s\n", "little endian");
	break;
    default:
	(void)fprintf(data_s->print_fp, "\t%s\n", "unknown endian");
	break;
    }

    (void)fprintf(data_s->print_fp, "\tprotocol_version = 0x%02x\n",
		  v->protocol_version);

    (void)fprintf(data_s->print_fp, "\tuser name = ");
    iiimp_string_print(data_s, v->user_name);
    (void)fputc('\n', data_s->print_fp);

    (void)fprintf(data_s->print_fp, "\tauth protocol name = ");
    iiimp_string_list_print(data_s, v->auth);
    (void)fputc('\n', data_s->print_fp);
}


/* Local Variables: */
/* c-file-style: "iiim-project" */
/* End: */