/*
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;

	if (!(wad_base = COM_LoadHunkFile(filename)))
		Sys_Error ("W_LoadWadFile: couldn't load %s", filename);

	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);
}

/*
=============================================================================
WAD3 Texture Loading for BSP 3.0 Support
=============================================================================
*/

#ifdef GLQUAKE

#define TEXWAD_MAXIMAGES 16384

typedef struct 
{
	char name[MAX_QPATH];
	FILE *file;
	int position;
	int size;
} texwadlump_t;

static texwadlump_t texwadlump[TEXWAD_MAXIMAGES];

void WAD3_LoadTextureWadFile (char *filename) 
{
	lumpinfo_t *lumps, *lump_p;
	wadinfo_t header;
	int i, j, infotableofs, numlumps, lowmark;
	FILE *file;

	if (COM_FOpenFile (va("textures/halflife/%s", filename), &file) != -1)
		goto loaded;

	if (COM_FOpenFile (va("textures/%s", filename), &file) != -1)
		goto loaded;

	if (COM_FOpenFile (filename, &file) != -1)
		goto loaded;

	Host_Error ("Couldn't load halflife wad \"%s\"\n", filename);

loaded:
	if (fread(&header, 1, sizeof(wadinfo_t), file) != sizeof(wadinfo_t)) {
		Con_Printf ("WAD3_LoadTextureWadFile: unable to read wad header");
		return;
	}

	if (memcmp(header.identification, "WAD3", 4)) {
		Con_Printf ("WAD3_LoadTextureWadFile: Wad file %s doesn't have WAD3 id\n",filename);
		return;
	}

	numlumps = LittleLong(header.numlumps);
	if (numlumps < 1 || numlumps > TEXWAD_MAXIMAGES) {
		Con_Printf ("WAD3_LoadTextureWadFile: invalid number of lumps (%i)\n", numlumps);
		return;
	}

	infotableofs = LittleLong(header.infotableofs);
	if (fseek(file, infotableofs, SEEK_SET)) {
		Con_Printf ("WAD3_LoadTextureWadFile: unable to seek to lump table");
		return;
	}

	lowmark = Hunk_LowMark();
	if (!(lumps = Hunk_AllocName((sizeof(lumpinfo_t) * numlumps),"lumps"))) 
	{
		Con_Printf ("WAD3_LoadTextureWadFile: unable to allocate temporary memory for lump table");
		return;
	}

	if (fread(lumps, 1, sizeof(lumpinfo_t) * numlumps, file) != sizeof(lumpinfo_t) * numlumps) {
		Con_Printf ("WAD3_LoadTextureWadFile: unable to read lump table");
		Hunk_FreeToLowMark(lowmark);
		return;
	}

	for (i = 0, lump_p = lumps; i < numlumps; i++,lump_p++) {
		W_CleanupName (lump_p->name, lump_p->name);
		for (j = 0; j < TEXWAD_MAXIMAGES; j++) {
			if (!texwadlump[j].name[0] || !strcmp(lump_p->name, texwadlump[j].name))
				break;
		}
		if (j == TEXWAD_MAXIMAGES)
			break; // we are full, don't load any more
		if (!texwadlump[j].name[0])
			Q_strncpyz (texwadlump[j].name, lump_p->name, sizeof(texwadlump[j].name));
		texwadlump[j].file = file;
		texwadlump[j].position = LittleLong(lump_p->filepos);
		texwadlump[j].size = LittleLong(lump_p->disksize);
	}

	Hunk_FreeToLowMark(lowmark);
	//leaves the file open
}


//converts paletted to rgba
static byte *ConvertWad3ToRGBA(miptex_t *tex)
{
	byte *in, *data, *pal;
	int i, p, image_size;

	if (!tex->offsets[0])
		Sys_Error("ConvertWad3ToRGBA: tex->offsets[0] == 0");

	image_size = tex->width * tex->height;
	in = (byte *) ((byte *) tex + tex->offsets[0]);
	data = Q_malloc(image_size * 4);

	pal = in + ((image_size * 85) >> 6) + 2;
	
	for (i = 0; i < image_size; i++) 
	{
		p = *in++;
		if (tex->name[0] == '{' && p == 255) 
		{
			((int *) data)[i] = 0;
		} 
		else 
		{
			p *= 3;
			data[i * 4 + 0] = pal[p];
			data[i * 4 + 1] = pal[p + 1];
			data[i * 4 + 2] = pal[p + 2];
			data[i * 4 + 3] = 255;
		}
	}
	return data;
}

byte *WAD3_LoadTexture(miptex_t *mt) 
{
	char texname[MAX_QPATH];
	int i, j, lowmark = 0;
	FILE *file;
	miptex_t *tex;
	byte *data;

	if (mt->offsets[0])
		return ConvertWad3ToRGBA(mt);

	texname[sizeof(texname) - 1] = 0;
	W_CleanupName (mt->name, texname);
	for (i = 0; i < TEXWAD_MAXIMAGES; i++) 
	{
		if (!texwadlump[i].name[0])
			break;
		if (strcmp(texname, texwadlump[i].name))
			continue;

		file = texwadlump[i].file;
		if (fseek(file, texwadlump[i].position, SEEK_SET)) 
		{
			Con_Printf("WAD3_LoadTexture: corrupt WAD3 file");
			return NULL;
		}
		lowmark = Hunk_LowMark();
		tex = Hunk_AllocName(texwadlump[i].size,"WAD3tex");
		if (fread(tex, 1, texwadlump[i].size, file) < texwadlump[i].size) 
		{
			Con_Printf("WAD3_LoadTexture: corrupt WAD3 file");
			Hunk_FreeToLowMark(lowmark);
			return NULL;
		}
		tex->width = LittleLong(tex->width);
		tex->height = LittleLong(tex->height);
		if (tex->width != mt->width || tex->height != mt->height) 
		{
			Hunk_FreeToLowMark(lowmark);
			return NULL;
		}
		for (j = 0;j < MIPLEVELS;j++)
			tex->offsets[j] = LittleLong(tex->offsets[j]);
		data = ConvertWad3ToRGBA(tex);
		Hunk_FreeToLowMark(lowmark);
		return data;
	}
	return NULL;
}

#endif
