starfighter/code/unpack.cpp

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/*
Copyright (C) 2003 Parallel Realities
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.
*/
#include "unpack.h"
/*
Searches the pak file for the required data. When
it 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
}