/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// wad.c

#include "quakedef.h"

int     wad_numlumps;
lumpinfo_t  *wad_lumps;
byte    *wad_base;

void SwapPic (qpic_t *pic);

/*
==================
W_CleanupName

Lowercases name and pads with spaces and a terminating 0 to the length of
lumpinfo_t->name.
Used so lumpname lookups can proceed rapidly by comparing 4 chars at a time
Space padding is so names can be printed nicely in tables.
Can safely be performed in place.
==================
*/
void W_CleanupName (char *in, char *out)
{
  int   i;
  int   c;
  
  for (i=0 ; i<16 ; i++ )
  {
    c = in[i];
    if (!c)
      break;
      
    if (c >= 'A' && c <= 'Z')
      c += ('a' - 'A');
    out[i] = c;
  }
  
  for ( ; i< 16 ; i++ )
    out[i] = 0;
}



/*
====================
W_LoadWadFile
====================
*/
void W_LoadWadFile (char *filename)
{
  lumpinfo_t    *lump_p;
  wadinfo_t   *header;
  unsigned    i;
  int       infotableofs;
  
  wad_base = COM_LoadHunkFile (filename);
  if (!wad_base)
    Sys_Error ("W_LoadWadFile: couldn't load %s", filename);

  header = (wadinfo_t *)wad_base;
  
  if (header->identification[0] != 'W'
  || header->identification[1] != 'A'
  || header->identification[2] != 'D'
  || header->identification[3] != '2')
    Sys_Error ("Wad file %s doesn't have WAD2 id\n",filename);
    
  wad_numlumps = LittleLong(header->numlumps);
  infotableofs = LittleLong(header->infotableofs);
  wad_lumps = (lumpinfo_t *)(wad_base + infotableofs);
  
  for (i=0, lump_p = wad_lumps ; i<wad_numlumps ; i++,lump_p++)
  {
    lump_p->filepos = LittleLong(lump_p->filepos);
    lump_p->size = LittleLong(lump_p->size);
    W_CleanupName (lump_p->name, lump_p->name);
    if (lump_p->type == TYP_QPIC)
      SwapPic ( (qpic_t *)(wad_base + lump_p->filepos));
  }
}


/*
=============
W_GetLumpinfo
=============
*/
lumpinfo_t  *W_GetLumpinfo (char *name)
{
  int   i;
  lumpinfo_t  *lump_p;
  char  clean[16];
  
  W_CleanupName (name, clean);
  
  for (lump_p=wad_lumps, i=0 ; i<wad_numlumps ; i++,lump_p++)
  {
    if (!strcmp(clean, lump_p->name))
      return lump_p;
  }
  
  Sys_Error ("W_GetLumpinfo: %s not found", name);
  return NULL;
}

void *W_GetLumpName (char *name)
{
  lumpinfo_t  *lump;
  
  lump = W_GetLumpinfo (name);
  
  return (void *)(wad_base + lump->filepos);
}

void *W_GetLumpNum (int num)
{
  lumpinfo_t  *lump;
  
  if (num < 0 || num > wad_numlumps)
    Sys_Error ("W_GetLumpNum: bad number: %i", num);
    
  lump = wad_lumps + num;
  
  return (void *)(wad_base + lump->filepos);
}

/*
=============================================================================

automatic byte swapping

=============================================================================
*/

void SwapPic (qpic_t *pic)
{
  pic->width = LittleLong(pic->width);
  pic->height = LittleLong(pic->height);  
}