/*
  The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-)
  Copyright (C) 2001-2020 Aymeric MOIZARD amoizard@antisip.com

  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
*/

#include <osipparser2/internal.h>

#include <osipparser2/osip_port.h>
#include <osipparser2/osip_message.h>
#include <osipparser2/osip_parser.h>

/* Add a header to a SIP message.                           */
/* INPUT :  char *hname | pointer to a header name.         */
/* INPUT :  char *hvalue | pointer to a header value.       */
/* OUTPUT: osip_message_t *sip | structure to save results.          */
/* returns -1 on error. */
int osip_message_set_header(osip_message_t *sip, const char *hname, const char *hvalue) {
  osip_header_t *h;
  int i;

  if (sip == NULL || hname == NULL)
    return OSIP_BADPARAMETER;

  i = osip_header_init(&h);

  if (i != 0)
    return i;

  h->hname = (char *) osip_malloc(strlen(hname) + 1);

  if (h->hname == NULL) {
    osip_header_free(h);
    return OSIP_NOMEM;
  }

  osip_clrncpy(h->hname, hname, strlen(hname));

  if (hvalue != NULL) { /* some headers can be null ("subject:") */
    h->hvalue = (char *) osip_malloc(strlen(hvalue) + 1);

    if (h->hvalue == NULL) {
      osip_header_free(h);
      return OSIP_NOMEM;
    }

    osip_clrncpy(h->hvalue, hvalue, strlen(hvalue));

  } else
    h->hvalue = NULL;

  sip->message_property = 2;
  osip_list_add(&sip->headers, h, -1);
  return OSIP_SUCCESS; /* ok */
}

/* Add a or replace exising header  to a SIP message.       */
/* INPUT :  char *hname | pointer to a header name.         */
/* INPUT :  char *hvalue | pointer to a header value.       */
/* OUTPUT: osip_message_t *sip | structure to save results. */
/* returns -1 on error. */
int osip_message_replace_header(osip_message_t *sip, const char *hname, const char *hvalue) {
  osip_header_t *h, *oldh;
  int i, oldpos = -1;

  if (sip == NULL || hname == NULL)
    return OSIP_BADPARAMETER;

  oldpos = osip_message_header_get_byname(sip, hname, 0, &oldh);

  i = osip_header_init(&h);

  if (i != 0)
    return i;

  h->hname = (char *) osip_malloc(strlen(hname) + 1);

  if (h->hname == NULL) {
    osip_header_free(h);
    return OSIP_NOMEM;
  }

  osip_clrncpy(h->hname, hname, strlen(hname));

  if (hvalue != NULL) { /* some headers can be null ("subject:") */
    h->hvalue = (char *) osip_malloc(strlen(hvalue) + 1);

    if (h->hvalue == NULL) {
      osip_header_free(h);
      return OSIP_NOMEM;
    }

    osip_clrncpy(h->hvalue, hvalue, strlen(hvalue));

  } else
    h->hvalue = NULL;

  if (oldpos != -1) {
    osip_list_remove(&sip->headers, oldpos);
    osip_header_free(oldh);
  }

  sip->message_property = 2;
  osip_list_add(&sip->headers, h, -1);
  return OSIP_SUCCESS; /* ok */
}

#ifndef MINISIZE
/* Add a header to a SIP message at the top of the list.    */
/* INPUT :  char *hname | pointer to a header name.         */
/* INPUT :  char *hvalue | pointer to a header value.       */
/* OUTPUT: osip_message_t *sip | structure to save results.          */
/* returns -1 on error. */
int osip_message_set_topheader(osip_message_t *sip, const char *hname, const char *hvalue) {
  osip_header_t *h;
  int i;

  if (sip == NULL || hname == NULL)
    return OSIP_BADPARAMETER;

  i = osip_header_init(&h);

  if (i != 0)
    return i;

  h->hname = (char *) osip_malloc(strlen(hname) + 1);

  if (h->hname == NULL) {
    osip_header_free(h);
    return OSIP_NOMEM;
  }

  osip_clrncpy(h->hname, hname, strlen(hname));

  if (hvalue != NULL) { /* some headers can be null ("subject:") */
    h->hvalue = (char *) osip_malloc(strlen(hvalue) + 1);

    if (h->hvalue == NULL) {
      osip_header_free(h);
      return OSIP_NOMEM;
    }

    osip_clrncpy(h->hvalue, hvalue, strlen(hvalue));

  } else
    h->hvalue = NULL;

  sip->message_property = 2;
  osip_list_add(&sip->headers, h, 0);
  return OSIP_SUCCESS; /* ok */
}

/* Get a header in a SIP message.                       */
/* INPUT : int pos | position of number in message.     */
/* OUTPUT: osip_message_t *sip | structure to scan for a header .*/
/* return null on error. */
int osip_message_get_header(const osip_message_t *sip, int pos, osip_header_t **dest) {
  *dest = NULL;

  if (osip_list_size(&sip->headers) <= pos)
    return OSIP_UNDEFINED_ERROR; /* NULL */

  *dest = (osip_header_t *) osip_list_get(&sip->headers, pos);
  return pos;
}
#endif

/* Get a header in a SIP message.                       */
/* INPUT : int pos | position where we start the search */
/* OUTPUT: osip_message_t *sip | structure to look for header.   */
/* return the current position of the header found      */
/* and -1 on error. */
int osip_message_header_get_byname(const osip_message_t *sip, const char *hname, int pos, osip_header_t **dest) {
  int i;
  osip_header_t *tmp;

  *dest = NULL;
  i = pos;

  if (osip_list_size(&sip->headers) <= pos)
    return OSIP_UNDEFINED_ERROR; /* NULL */

  while (osip_list_size(&sip->headers) > i) {
    tmp = (osip_header_t *) osip_list_get(&sip->headers, i);

    if (osip_strcasecmp(tmp->hname, hname) == 0) {
      *dest = tmp;
      return i;
    }

    i++;
  }

  return OSIP_UNDEFINED_ERROR; /* not found */
}

int osip_header_init(osip_header_t **header) {
  *header = (osip_header_t *) osip_malloc(sizeof(osip_header_t));

  if (*header == NULL)
    return OSIP_NOMEM;

  (*header)->hname = NULL;
  (*header)->hvalue = NULL;
  return OSIP_SUCCESS;
}

void osip_header_free(osip_header_t *header) {
  if (header == NULL)
    return;

  osip_free(header->hname);
  osip_free(header->hvalue);
  header->hname = NULL;
  header->hvalue = NULL;

  osip_free(header);
}

/* returns the header as a string.    */
/* INPUT : osip_header_t *header | header. */
/* returns null on error. */
int osip_header_to_str(const osip_header_t *header, char **dest) {
  size_t len, hlen;

  *dest = NULL;

  if ((header == NULL) || (header->hname == NULL))
    return OSIP_BADPARAMETER;

  len = 0;
  hlen = strlen(header->hname);

  if (header->hvalue != NULL)
    len = strlen(header->hvalue);

  *dest = (char *) osip_malloc(hlen + len + 3);

  if (*dest == NULL)
    return OSIP_NOMEM;

  if (header->hvalue != NULL)
    snprintf(*dest, hlen + len + 3, "%s: %s", header->hname, header->hvalue);

  else
    snprintf(*dest, hlen + len + 3, "%s: ", header->hname);

  if (*dest[0] >= 'a' && *dest[0] <= 'z')
    *dest[0] = (*dest[0] - 32);

  return OSIP_SUCCESS;
}

char *osip_header_get_name(const osip_header_t *header) {
  if (header == NULL)
    return NULL;

  return header->hname;
}

void osip_header_set_name(osip_header_t *header, char *name) {
  header->hname = name;
}

char *osip_header_get_value(const osip_header_t *header) {
  if (header == NULL)
    return NULL;

  return header->hvalue;
}

void osip_header_set_value(osip_header_t *header, char *value) {
  header->hvalue = value;
}

int osip_header_clone(const osip_header_t *header, osip_header_t **dest) {
  int i;
  osip_header_t *he;

  *dest = NULL;

  if (header == NULL)
    return OSIP_BADPARAMETER;

  if (header->hname == NULL)
    return OSIP_BADPARAMETER;

  i = osip_header_init(&he);

  if (i != 0)
    return i;

  he->hname = osip_strdup(header->hname);

  if (he->hname == NULL) {
    osip_header_free(he);
    return OSIP_NOMEM;
  }

  if (header->hvalue != NULL) {
    he->hvalue = osip_strdup(header->hvalue);

    if (he->hvalue == NULL) {
      osip_header_free(he);
      return OSIP_NOMEM;
    }
  }

  *dest = he;
  return OSIP_SUCCESS;
}