/*Copyright (C) 2003 Parallel RealitiesThis program is free software; you can redistribute it and/ormodify it under the terms of the GNU General Public Licenseas published by the Free Software Foundation; either version 2of 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 ofMERCHANTABILITY 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 Licensealong with this program; if not, write to the Free SoftwareFoundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.*/#include "unpack.h"/*Searches the pak file for the required data. Whenit is found, the data is read into a character buffer.*/void unpack(char *file, signed char fileType){	unsigned char *packBuffer;	char packFilename[60];	int packFSize;	FILE *pak;	FILE *fp = NULL; // music has to be read-written-read!	char musicFilename[PATH_MAX];	strcpy(packFilename, "");	pak = fopen(PACKLOCATION, "rb");	if (pak == NULL)	{		printf("Couldn't access the Project: Starfighter data file!\n");		exit(1);	}	fseek(pak, 4, SEEK_SET);	while (true)	{		if (!fread(packFilename, 1, 56, pak))		{			fclose(pak);			if (fileType != PAK_FONT)			{				showErrorAndExit(0, file);			}			exit(1);			break;		}		fread(&packFSize, 4, 1, pak);		packFSize = SDL_SwapLE32(packFSize);		if (strcmp(packFilename, file) == 0)		{			if ((fileType == PAK_MOD) || (fileType == PAK_S3M))			{				if (fileType == PAK_MOD)				{					sprintf(musicFilename, "%smusic.mod", engine.userHomeDirectory);					fp = fopen(musicFilename, "wb");				}				else				{					sprintf(musicFilename, "%smusic.s3m", engine.userHomeDirectory);					fp = fopen(musicFilename, "wb");				}				if (fp == NULL)					showErrorAndExit(1, "");			}			packBuffer = (unsigned char*) malloc(packFSize);			fread(packBuffer, 1, packFSize, pak);			if ((fileType == PAK_MOD) || (fileType == PAK_S3M))			{				fwrite(packBuffer, 1, packFSize, fp);				fclose(fp);			}			break;		}		else		{			fseek(pak, packFSize, SEEK_CUR);		}	}	if ((fileType != PAK_MOD) && (fileType != PAK_S3M))		engine.sdlrw = SDL_RWFromMem(packBuffer, packFSize);	//printf("Extracted: %s\n", file);	fclose(pak);}/*Search the data package for the required file.When it is found, return the location.*/int locateDataInPak(char *file, signed char required){	//printf("Looking for %s...", file);	char packFilename[60];	int packFSize;	int location = 0;	FILE *pak;	strcpy(packFilename, "");	pak = fopen(PACKLOCATION, "rb");	if (pak == NULL)	{		printf("Couldn't access the Project: Starfighter data file!\n");		exit(1);	}	fseek(pak, 4, SEEK_SET);	while (true)	{		if (!fread(packFilename, 1, 56, pak))		{			fclose(pak);			if (required)			{				showErrorAndExit(0, file);				exit(1);			}			break;		}		fread(&packFSize, 4, 1, pak);		packFSize = SDL_SwapLE32(packFSize);		if (strcmp(packFilename, file) == 0)		{			location = ftell(pak);			fclose(pak);			//printf("found it!\n");			return location;		}		else		{			fseek(pak, packFSize, SEEK_CUR);		}	}	//printf("not found (skipping)\n");	return -1; // we only get this if it isn't required}