499 lines
9.8 KiB
C
499 lines
9.8 KiB
C
/*
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THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
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SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
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END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
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ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
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IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
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SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
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FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
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CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
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AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
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COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
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*/
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#ifdef HAVE_CONFIG_H
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#include <conf.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include "pstypes.h"
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#include "u_mem.h"
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#include "strutil.h"
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#include "d_io.h"
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#include "error.h"
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#include "cfile.h"
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#include "byteswap.h"
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typedef struct hogfile {
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char name[13];
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int offset;
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int length;
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} hogfile;
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#define MAX_HOGFILES 300
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hogfile HogFiles[MAX_HOGFILES];
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char Hogfile_initialized = 0;
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int Num_hogfiles = 0;
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hogfile AltHogFiles[MAX_HOGFILES];
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char AltHogfile_initialized = 0;
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int AltNum_hogfiles = 0;
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char HogFilename[64];
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char AltHogFilename[64];
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char AltHogDir[64];
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char AltHogdir_initialized = 0;
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// routine to take a DOS path and turn it into a macintosh
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// pathname. This routine is based on the fact that we should
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// see a \ character in the dos path. The sequence .\ a tthe
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// beginning of a path is turned into a :
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#ifdef MACINTOSH
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void macify_dospath(char *dos_path, char *mac_path)
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{
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char *p;
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if (!strncmp(dos_path, ".\\", 2)) {
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strcpy(mac_path, ":");
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strcat(mac_path, &(dos_path[2]) );
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} else
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strcpy(mac_path, dos_path);
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while ( (p = strchr(mac_path, '\\')) != NULL)
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*p = ':';
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}
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#endif
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void cfile_use_alternate_hogdir( char * path )
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{
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if ( path ) {
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strcpy( AltHogDir, path );
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AltHogdir_initialized = 1;
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} else {
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AltHogdir_initialized = 0;
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}
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}
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//in case no one installs one
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int default_error_counter=0;
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//ptr to counter of how many critical errors
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int *critical_error_counter_ptr=&default_error_counter;
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//tell cfile about your critical error counter
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void cfile_set_critical_error_counter_ptr(int *ptr)
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{
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critical_error_counter_ptr = ptr;
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}
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FILE * cfile_get_filehandle( char * filename, char * mode )
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{
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FILE * fp;
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char temp[128];
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*critical_error_counter_ptr = 0;
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fp = fopen( filename, mode );
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if ( fp && *critical_error_counter_ptr ) {
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fclose(fp);
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fp = NULL;
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}
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if ( (fp==NULL) && (AltHogdir_initialized) ) {
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strcpy( temp, AltHogDir );
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strcat( temp, filename );
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*critical_error_counter_ptr = 0;
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fp = fopen( temp, mode );
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if ( fp && *critical_error_counter_ptr ) {
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fclose(fp);
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fp = NULL;
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}
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}
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return fp;
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}
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//returns 1 if file loaded with no errors
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int cfile_init_hogfile(char *fname, hogfile * hog_files, int * nfiles )
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{
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char id[4];
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FILE * fp;
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int i, len;
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*nfiles = 0;
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fp = cfile_get_filehandle( fname, "rb" );
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if ( fp == NULL ) return 0;
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fread( id, 3, 1, fp );
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if ( strncmp( id, "DHF", 3 ) ) {
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fclose(fp);
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return 0;
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}
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while( 1 )
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{
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if ( *nfiles >= MAX_HOGFILES ) {
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fclose(fp);
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Error( "HOGFILE is limited to %d files.\n", MAX_HOGFILES );
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}
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i = fread( hog_files[*nfiles].name, 13, 1, fp );
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if ( i != 1 ) { //eof here is ok
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fclose(fp);
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return 1;
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}
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i = fread( &len, 4, 1, fp );
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if ( i != 1 ) {
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fclose(fp);
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return 0;
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}
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hog_files[*nfiles].length = INTEL_INT(len);
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hog_files[*nfiles].offset = ftell( fp );
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*nfiles = (*nfiles) + 1;
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// Skip over
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i = fseek( fp, INTEL_INT(len), SEEK_CUR );
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}
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}
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//Specify the name of the hogfile. Returns 1 if hogfile found & had files
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int cfile_init(char *hogname)
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{
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#ifdef MACINTOSH
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char mac_path[255];
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macify_dospath(hogname, mac_path);
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#endif
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Assert(Hogfile_initialized == 0);
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#ifndef MACINTOSH
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if (cfile_init_hogfile(hogname, HogFiles, &Num_hogfiles )) {
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strcpy( HogFilename, hogname );
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#else
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if (cfile_init_hogfile(mac_path, HogFiles, &Num_hogfiles )) {
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strcpy( HogFilename, mac_path );
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#endif
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Hogfile_initialized = 1;
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return 1;
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}
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else
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return 0; //not loaded!
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}
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FILE * cfile_find_libfile(char * name, int * length)
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{
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FILE * fp;
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int i;
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if ( AltHogfile_initialized ) {
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for (i=0; i<AltNum_hogfiles; i++ ) {
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if ( !stricmp( AltHogFiles[i].name, name )) {
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fp = cfile_get_filehandle( AltHogFilename, "rb" );
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if ( fp == NULL ) return NULL;
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fseek( fp, AltHogFiles[i].offset, SEEK_SET );
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*length = AltHogFiles[i].length;
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return fp;
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}
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}
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}
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if ( !Hogfile_initialized ) {
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//@@cfile_init_hogfile( "DESCENT2.HOG", HogFiles, &Num_hogfiles );
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//@@Hogfile_initialized = 1;
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//Int3(); //hogfile ought to be initialized
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}
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for (i=0; i<Num_hogfiles; i++ ) {
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if ( !stricmp( HogFiles[i].name, name )) {
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fp = cfile_get_filehandle( HogFilename, "rb" );
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if ( fp == NULL ) return NULL;
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fseek( fp, HogFiles[i].offset, SEEK_SET );
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*length = HogFiles[i].length;
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return fp;
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}
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}
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return NULL;
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}
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int cfile_use_alternate_hogfile( char * name )
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{
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if ( name ) {
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#ifdef MACINTOSH
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char mac_path[255];
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macify_dospath(name, mac_path);
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strcpy( AltHogFilename, mac_path);
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#else
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strcpy( AltHogFilename, name );
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#endif
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cfile_init_hogfile( AltHogFilename, AltHogFiles, &AltNum_hogfiles );
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AltHogfile_initialized = 1;
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return (AltNum_hogfiles > 0);
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} else {
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AltHogfile_initialized = 0;
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return 1;
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}
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}
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int cfexist( char * filename )
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{
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int length;
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FILE *fp;
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if (filename[0] != '\x01')
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fp = cfile_get_filehandle( filename, "rb" ); // Check for non-hog file first...
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else {
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fp = NULL; //don't look in dir, only in hogfile
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filename++;
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}
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if ( fp ) {
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fclose(fp);
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return 1;
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}
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fp = cfile_find_libfile(filename, &length );
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if ( fp ) {
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fclose(fp);
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return 2; // file found in hog
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}
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return 0; // Couldn't find it.
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}
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CFILE * cfopen(char * filename, char * mode )
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{
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int length;
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FILE * fp;
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CFILE *cfile;
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if (stricmp( mode, "rb")) {
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Error( "cfiles can only be opened with mode==rb\n" );
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}
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if (filename[0] != '\x01') {
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#ifdef MACINTOSH
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char mac_path[255];
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macify_dospath(filename, mac_path);
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fp = cfile_get_filehandle( mac_path, mode);
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#else
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fp = cfile_get_filehandle( filename, mode ); // Check for non-hog file first...
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#endif
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} else {
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fp = NULL; //don't look in dir, only in hogfile
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filename++;
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}
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if ( !fp ) {
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fp = cfile_find_libfile(filename, &length );
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if ( !fp )
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return NULL; // No file found
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cfile = d_malloc ( sizeof(CFILE) );
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if ( cfile == NULL ) {
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fclose(fp);
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return NULL;
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}
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cfile->file = fp;
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cfile->size = length;
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cfile->lib_offset = ftell( fp );
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cfile->raw_position = 0;
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return cfile;
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} else {
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cfile = d_malloc ( sizeof(CFILE) );
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if ( cfile == NULL ) {
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fclose(fp);
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return NULL;
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}
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cfile->file = fp;
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cfile->size = filelength( fileno(fp) );
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cfile->lib_offset = 0;
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cfile->raw_position = 0;
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return cfile;
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}
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}
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int cfilelength( CFILE *fp )
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{
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return fp->size;
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}
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int cfgetc( CFILE * fp )
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{
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int c;
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if (fp->raw_position >= fp->size ) return EOF;
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c = getc( fp->file );
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if (c!=EOF)
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fp->raw_position++;
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// Assert( fp->raw_position==(ftell(fp->file)-fp->lib_offset) );
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return c;
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}
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char * cfgets( char * buf, size_t n, CFILE * fp )
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{
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char * t = buf;
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int i;
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int c;
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for (i=0; i<n-1; i++ ) {
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do {
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if (fp->raw_position >= fp->size ) {
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*buf = 0;
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return NULL;
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}
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c = fgetc( fp->file );
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fp->raw_position++;
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#ifdef MACINTOSH
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if (c == 13) {
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int c1;
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c1 = fgetc( fp->file );
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fseek( fp->file, -1, SEEK_CUR);
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if ( c1 == 10 )
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continue;
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else
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break;
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}
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#endif
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} while ( c == 13 );
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#ifdef MACINTOSH // because cr-lf is a bad thing on the mac
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if ( c == 13 ) // and anyway -- 0xod is CR on mac, not 0x0a
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c = '\n';
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#endif
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*buf++ = c;
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if ( c=='\n' ) break;
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}
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*buf++ = 0;
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return t;
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}
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size_t cfread( void * buf, size_t elsize, size_t nelem, CFILE * fp )
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{
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unsigned int i, size;
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size = elsize * nelem;
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if ( size < 1 ) return 0;
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i = fread ( buf, 1, size, fp->file );
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fp->raw_position += i;
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return i/elsize;
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}
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int cftell( CFILE *fp )
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{
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return fp->raw_position;
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}
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int cfseek( CFILE *fp, long int offset, int where )
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{
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int c, goal_position;
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switch( where ) {
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case SEEK_SET:
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goal_position = offset;
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break;
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case SEEK_CUR:
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goal_position = fp->raw_position+offset;
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break;
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case SEEK_END:
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goal_position = fp->size+offset;
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break;
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default:
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return 1;
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}
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c = fseek( fp->file, fp->lib_offset + goal_position, SEEK_SET );
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fp->raw_position = ftell(fp->file)-fp->lib_offset;
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return c;
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}
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void cfclose( CFILE * fp )
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{
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fclose(fp->file);
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d_free(fp);
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return;
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}
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// routines to read basic data types from CFILE's. Put here to
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// simplify mac/pc reading from cfiles.
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int cfile_read_int(CFILE *file)
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{
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int32_t i;
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if (cfread( &i, sizeof(i), 1, file) != 1)
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Error( "Error reading int in cfile_read_int()" );
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i = INTEL_INT(i);
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return i;
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}
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short cfile_read_short(CFILE *file)
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{
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int16_t s;
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if (cfread( &s, sizeof(s), 1, file) != 1)
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Error( "Error reading short in cfile_read_short()" );
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s = INTEL_SHORT(s);
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return s;
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}
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byte cfile_read_byte(CFILE *file)
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{
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byte b;
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if (cfread( &b, sizeof(b), 1, file) != 1)
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Error( "Error reading byte in cfile_read_byte()" );
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return b;
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}
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fix cfile_read_fix(CFILE *file)
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{
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fix f;
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if (cfread( &f, sizeof(f), 1, file) != 1)
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Error( "Error reading fix in cfile_read_fix()" );
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f = (fix)INTEL_INT((int)f);
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return f;
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}
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fixang cfile_read_fixang(CFILE *file)
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{
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fixang f;
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if (cfread(&f, 2, 1, file) != 1)
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Error("Error reading fixang in cfile_read_fixang()");
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f = (fixang) INTEL_SHORT((int) f);
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return f;
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}
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void cfile_read_vector(vms_vector *v, CFILE *file)
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{
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v->x = cfile_read_fix(file);
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v->y = cfile_read_fix(file);
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v->z = cfile_read_fix(file);
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}
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void cfile_read_angvec(vms_angvec *v, CFILE *file)
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{
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v->p = cfile_read_fixang(file);
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v->b = cfile_read_fixang(file);
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v->h = cfile_read_fixang(file);
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}
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