/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
Copyright (C) 2010-2014 QuakeSpasm developers

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 "q_defs.h"

int32_t                         wad_numlumps;
lumpinfo_t              *wad_lumps;
byte                    *wad_base = NULL;

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(const char *in, char *out)
{
	int32_t         i;
	int32_t         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(void)  //johnfitz -- filename is now hard-coded for honesty
{
	lumpinfo_t              *lump_p;
	wadinfo_t               *header;
	int32_t                 i;
	int32_t                 infotableofs;
	const char              *filename = WADFILENAME;

	//johnfitz -- modified to use malloc
	//TODO: use cache_alloc
	if(wad_base)
		free(wad_base);
	wad_base = COM_LoadMallocFile(filename, NULL);
	if(!wad_base)
		Sys_Error("W_LoadWadFile: couldn't load %s\n\n"
		          "Basedir is: %s\n\n"
		          "Check that this has an " GAMENAME " subdirectory containing pak0.pak and pak1.pak, "
		          "or use the -basedir command-line option to specify another directory.",
		          filename, com_basedir);

	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);      // CAUTION: in-place editing!!!
		if(lump_p->type == TYP_QPIC)
			SwapPic((qpic_t *)(wad_base + lump_p->filepos));
	}
}


/*
=============
W_GetLumpinfo
=============
*/
lumpinfo_t      *W_GetLumpinfo(const char *name)
{
	int32_t         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;
	}

	Con_SafePrintf("W_GetLumpinfo: %s not found\n", name);  //johnfitz -- was Sys_Error
	return NULL;
}

void *W_GetLumpName(const char *name)
{
	lumpinfo_t      *lump;

	lump = W_GetLumpinfo(name);

	if(!lump) return NULL;  //johnfitz

	return wad_base + lump->filepos;
}

void *W_GetLumpNum(int32_t num)
{
	lumpinfo_t      *lump;

	if(num < 0 || num > wad_numlumps)
		Sys_Error("W_GetLumpNum: bad number: %" PRIi32, num);

	lump = wad_lumps + num;

	return wad_base + lump->filepos;
}

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

automatic byte swapping

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

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