/*
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, 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;
	FILE		*file;
	int		len;

	if ((len = COM_FOpenFile(filename, &file, false)) == -1)
		Sys_Error ("W_LoadWadFile: couldn't load %s", filename);

	wad_base = Q_Malloc (len + 1);
	fread (wad_base, 1, len, file);
	wad_base[len] = 0;
	fclose (file);

	header = (wadinfo_t *)wad_base;

	if (memcmp(header->identification, "WAD2", 4))
		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);
}
