/*      $NetBSD: libelf_allocate.c,v 1.5 2024/03/03 17:37:34 christos Exp $     */

/*-
* Copyright (c) 2006,2008,2010 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#if HAVE_NBTOOL_CONFIG_H
# include "nbtool_config.h"
#endif

/*
* Internal APIs
*/

#include <sys/cdefs.h>

#include <assert.h>
#include <errno.h>
#include <libelf.h>
#include <stdlib.h>
#include <string.h>

#include "_libelf.h"

__RCSID("$NetBSD: libelf_allocate.c,v 1.5 2024/03/03 17:37:34 christos Exp $");
ELFTC_VCSID("Id: libelf_allocate.c 3977 2022-05-01 06:45:34Z jkoshy");

Elf *
_libelf_allocate_elf(void)
{
       Elf *e;

       if ((e = calloc((size_t) 1, sizeof(*e))) == NULL) {
               LIBELF_SET_ERROR(RESOURCE, errno);
               return NULL;
       }

       e->e_activations = 1;
       e->e_byteorder   = ELFDATANONE;
       e->e_class       = ELFCLASSNONE;
       e->e_cmd         = ELF_C_NULL;
       e->e_fd          = -1;
       e->e_kind        = ELF_K_NONE;
       e->e_version     = LIBELF_PRIVATE(version);

       return (e);
}

void
_libelf_init_elf(Elf *e, Elf_Kind kind)
{
       assert(e != NULL);
       assert(e->e_kind == ELF_K_NONE);

       e->e_kind = kind;

       switch (kind) {
       case ELF_K_ELF:
               STAILQ_INIT(&e->e_u.e_elf.e_scn);
               break;
       default:
               break;
       }
}

void
_libelf_release_elf(Elf *e)
{
       Elf_Arhdr *arh;

       switch (e->e_kind) {
       case ELF_K_AR:
               free(e->e_u.e_ar.e_symtab);
               break;

       case ELF_K_ELF:
               switch (e->e_class) {
               case ELFCLASS32:
                       free(e->e_u.e_elf.e_ehdr.e_ehdr32);
                       free(e->e_u.e_elf.e_phdr.e_phdr32);
                       break;
               case ELFCLASS64:
                       free(e->e_u.e_elf.e_ehdr.e_ehdr64);
                       free(e->e_u.e_elf.e_phdr.e_phdr64);
                       break;
               }

               assert(STAILQ_EMPTY(&e->e_u.e_elf.e_scn));

               if (e->e_flags & LIBELF_F_AR_HEADER) {
                       arh = e->e_hdr.e_arhdr;
                       free(arh->ar_name);
                       free(arh->ar_rawname);
                       free(arh);
               }

               break;

       default:
               break;
       }

       free(e);
}

struct _Libelf_Data *
_libelf_allocate_data(Elf_Scn *s)
{
       struct _Libelf_Data *d;

       if ((d = calloc((size_t) 1, sizeof(*d))) == NULL) {
               LIBELF_SET_ERROR(RESOURCE, 0);
               return (NULL);
       }

       d->d_scn = s;

       return (d);
}

struct _Libelf_Data *
_libelf_release_data(struct _Libelf_Data *d)
{

       if (d->d_flags & LIBELF_F_DATA_MALLOCED)
               free(d->d_data.d_buf);

       free(d);

       return (NULL);
}

Elf_Scn *
_libelf_allocate_scn(Elf *e, size_t ndx)
{
       Elf_Scn *s;

       if ((s = calloc((size_t) 1, sizeof(Elf_Scn))) == NULL) {
               LIBELF_SET_ERROR(RESOURCE, errno);
               return (NULL);
       }

       s->s_elf = e;
       s->s_ndx = ndx;

       STAILQ_INIT(&s->s_data);
       STAILQ_INIT(&s->s_rawdata);

       STAILQ_INSERT_TAIL(&e->e_u.e_elf.e_scn, s, s_next);

       return (s);
}

Elf_Scn *
_libelf_release_scn(Elf_Scn *s)
{
       Elf *e;
       struct _Libelf_Data *d, *td;

       assert(s != NULL);

       STAILQ_FOREACH_SAFE(d, &s->s_data, d_next, td) {
               STAILQ_REMOVE(&s->s_data, d, _Libelf_Data, d_next);
               d = _libelf_release_data(d);
       }

       STAILQ_FOREACH_SAFE(d, &s->s_rawdata, d_next, td) {
               assert((d->d_flags & LIBELF_F_DATA_MALLOCED) == 0);
               STAILQ_REMOVE(&s->s_rawdata, d, _Libelf_Data, d_next);
               d = _libelf_release_data(d);
       }

       e = s->s_elf;

       assert(e != NULL);

       STAILQ_REMOVE(&e->e_u.e_elf.e_scn, s, _Elf_Scn, s_next);

       free(s);

       return (NULL);
}