#include "sysincludes.h"
#include "msdos.h"
#include "stream.h"
#include "mtools.h"
#include "file.h"
#include "fs.h"

/* #define DEBUG */

/*
 * Read a directory entry into caller supplied buffer
 */
struct directory *dir_read(direntry_t *entry, int *error)
{
	int n;
	*error = 0;
	if((n=force_read(entry->Dir, (char *) (&entry->dir), 
			 (mt_off_t) entry->entry * MDIR_SIZE, 
			 MDIR_SIZE)) != MDIR_SIZE) {
		if (n < 0) {
			*error = -1;
		}
		return NULL;
	}
	return &entry->dir;
}

/*
 * Make a subdirectory grow in length.  Only subdirectories (not root)
 * may grow.  Returns a 0 on success, 1 on failure (disk full), or -1
 * on error.
 */

int dir_grow(Stream_t *Dir, int size)
{
	Stream_t *Stream = GetFs(Dir);
	DeclareThis(FsPublic_t);
	int ret;
	int buflen;
	char *buffer;
	
	if (!getfreeMinClusters(Dir, 1))
		return -1;

	buflen = This->cluster_size * This->sector_size;

	if(! (buffer=malloc(buflen)) ){
		perror("dir_grow: malloc");
		return -1;
	}
		
	memset((char *) buffer, '\0', buflen);
	ret = force_write(Dir, buffer, (mt_off_t) size * MDIR_SIZE, buflen);
	free(buffer);
	if(ret < buflen)
		return -1;
	return 0;
}


void low_level_dir_write(direntry_t *entry)
{
	force_write(entry->Dir, 
		    (char *) (&entry->dir), 
		    (mt_off_t) entry->entry * MDIR_SIZE, MDIR_SIZE);
}


/*
 * Make a directory entry.  Builds a directory entry based on the
 * name, attribute, starting cluster number, and size.  Returns a pointer
 * to a static directory structure.
 */

struct directory *mk_entry(const char *filename, char attr,
			   unsigned int fat, size_t size, time_t date,
			   struct directory *ndir)
{
	struct tm *now;
	time_t date2 = date;
	unsigned char hour, min_hi, min_low, sec;
	unsigned char year, month_hi, month_low, day;

	now = localtime(&date2);
	strncpy(ndir->name, filename, 8);
	strncpy(ndir->ext, filename + 8, 3);
	ndir->attr = attr;
	ndir->ctime_ms = 0;
	hour = now->tm_hour << 3;
	min_hi = now->tm_min >> 3;
	min_low = now->tm_min << 5;
	sec = now->tm_sec / 2;
	ndir->ctime[1] = ndir->time[1] = hour + min_hi;
	ndir->ctime[0] = ndir->time[0] = min_low + sec;
	year = (now->tm_year - 80) << 1;
	month_hi = (now->tm_mon + 1) >> 3;
	month_low = (now->tm_mon + 1) << 5;
	day = now->tm_mday;
	ndir -> adate[1] = ndir->cdate[1] = ndir->date[1] = year + month_hi;
	ndir -> adate[0] = ndir->cdate[0] = ndir->date[0] = month_low + day;

	set_word(ndir->start, fat & 0xffff);
	set_word(ndir->startHi, fat >> 16);
	set_dword(ndir->size, size);
	return ndir;
}