/*      $NetBSD: libdwarf_str.c,v 1.5 2024/03/03 17:37:33 christos Exp $        */

/*-
* Copyright (c) 2009,2010,2023 Kai Wang
* 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.
*/

#include "_libdwarf.h"

__RCSID("$NetBSD: libdwarf_str.c,v 1.5 2024/03/03 17:37:33 christos Exp $");
ELFTC_VCSID("Id: libdwarf_str.c 4016 2023-10-15 05:39:46Z kaiwang27");

#define _INIT_DWARF_STRTAB_SIZE 1024

int
_dwarf_strtab_add(Dwarf_Debug dbg, char *string, uint64_t *off,
   Dwarf_Error *error)
{
       size_t len;

       assert(dbg != NULL && string != NULL);

       len = strlen(string) + 1;
       while (dbg->dbg_strtab_size + len > dbg->dbg_strtab_cap) {
               dbg->dbg_strtab_cap *= 2;
               dbg->dbg_strtab = realloc(dbg->dbg_strtab,
                   (size_t) dbg->dbg_strtab_cap);
               if (dbg->dbg_strtab == NULL) {
                       DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
                       return (DW_DLE_MEMORY);
               }
       }

       if (off != NULL)
               *off = dbg->dbg_strtab_size;

       memcpy(&dbg->dbg_strtab[dbg->dbg_strtab_size], string, len - 1);
       dbg->dbg_strtab_size += len;
       dbg->dbg_strtab[dbg->dbg_strtab_size - 1] = '\0';

       return (DW_DLE_NONE);
}

char *
_dwarf_strtab_get_table(Dwarf_Debug dbg)
{

       assert(dbg != NULL);

       return (dbg->dbg_strtab);
}

char *
_dwarf_strtab_get_line_table(Dwarf_Debug dbg)
{

       assert(dbg != NULL);

       return (dbg->dbg_line_strtab);
}

int
_dwarf_strtab_init(Dwarf_Debug dbg, Dwarf_Error *error)
{
       Dwarf_Section *ds;

       assert(dbg != NULL);

       if (dbg->dbg_mode == DW_DLC_READ || dbg->dbg_mode == DW_DLC_RDWR) {
               ds = _dwarf_find_section(dbg, ".debug_str");
               if (ds == NULL) {
                       dbg->dbg_strtab = NULL;
                       dbg->dbg_strtab_cap = dbg->dbg_strtab_size = 0;
                       return (DW_DLE_NONE);
               }

               dbg->dbg_strtab_cap = dbg->dbg_strtab_size = ds->ds_size;

               if (dbg->dbg_mode == DW_DLC_RDWR) {
                       if ((dbg->dbg_strtab = malloc((size_t) ds->ds_size)) ==
                           NULL) {
                               DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
                               return (DW_DLE_MEMORY);
                       }
                       memcpy(dbg->dbg_strtab, ds->ds_data, ds->ds_size);
               } else
                       dbg->dbg_strtab = (char *) ds->ds_data;

               ds = _dwarf_find_section(dbg, ".debug_line_str");
               if (ds != NULL) {
                       dbg->dbg_line_strtab = (char *) ds->ds_data;
               }
       } else {
               /* DW_DLC_WRITE */

               dbg->dbg_strtab_cap = _INIT_DWARF_STRTAB_SIZE;
               dbg->dbg_strtab_size = 0;

               if ((dbg->dbg_strtab = malloc((size_t) dbg->dbg_strtab_cap)) ==
                   NULL) {
                       DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
                       return (DW_DLE_MEMORY);
               }

               dbg->dbg_strtab[0] = '\0';
       }

       return (DW_DLE_NONE);
}

void
_dwarf_strtab_cleanup(Dwarf_Debug dbg)
{

       assert(dbg != NULL);

       if (dbg->dbg_mode == DW_DLC_RDWR || dbg->dbg_mode == DW_DLC_WRITE)
               free(dbg->dbg_strtab);
}

int
_dwarf_strtab_gen(Dwarf_P_Debug dbg, Dwarf_Error *error)
{
       Dwarf_P_Section ds;
       int ret;

       assert(dbg != NULL);

       if ((ret = _dwarf_section_init(dbg, &ds, ".debug_str", 0, error)) !=
           DW_DLE_NONE)
               return (ret);

       if (dbg->dbg_strtab_size > ds->ds_cap) {
               ds->ds_data = realloc(ds->ds_data,
                   (size_t) dbg->dbg_strtab_size);
               if (ds->ds_data == NULL) {
                       _dwarf_section_free(dbg, &ds);
                       DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
                       return (DW_DLE_MEMORY);
               }
               ds->ds_cap = dbg->dbg_strtab_size;
       }

       memcpy(ds->ds_data, dbg->dbg_strtab, dbg->dbg_strtab_size);
       ds->ds_size = dbg->dbg_strtab_size;

       /*
        * Inform application the creation of .debug_str ELF section.
        * Note that .debug_str use a different format than usual ELF
        * string table, so it should not have SHT_STRTAB as its type.
        */
       ret = _dwarf_section_callback(dbg, ds, SHT_PROGBITS, 0, 0, 0, error);

       return (ret);
}