#include "doomdefs.h"
#include	"directory.h"

/* Find the first byte of the "directory" and move 'fd' to it. */
int set_directory(int fd) {
	four_byte dir_start;
	char magic[4];

	/* Check for IWAD or PWAD magic */
	if ( lseek(fd, 1, SEEK_SET) < 0 )
		return(-1);
	if ( read(fd, magic, 3) != 3 )
		return(-1);
	magic[3]='\0';
	if ( strcmp(magic, "WAD") != 0 )
		return(-1);
	
	/* Get the start of the directory from the WAD header */
	if ( lseek(fd, 8, SEEK_SET) < 0 ) 
		return(-1);
	read(fd, (char *)&dir_start, 4);

	/* Go to it! */
	if ( lseek(fd, dir_start, SEEK_SET) < 0 )
		return(-1);
	return(0);
}

int get_entry(int fd, char *name, dir_entry *entry) {
	while ( read(fd, (char *)entry, ENTRY_SIZE) == ENTRY_SIZE ) {
		/* Null terminate the name */
		entry->name[8]='\0';
		/* Is it the entry we want? */
		if ( strcasecmp(entry->name, name) == 0 )
			return(0);
		/* Have we reached the end of the entries? */
		if ( strcasecmp(WADDIR_END, entry->name) == 0 )
			break;
	}
	/* We didn't find the proper entry */
	return(-1);
}