#include <string.h>
#include <nucleus/vfs.h>
#include "ext2fs.h"

size_t ext2fs_read(File *file, char *buf, size_t size, off_t offset);
int ext2fs_readdir(File *file, DirEntry *de, off_t index);
int ext2fs_open(File *file);

FileOps ext2fsFileOps = {
	.read = ext2fs_read,
//	.readdir = ext2fs_readdir,
	.open = ext2fs_open,
};

/* Read an ext2fs file */
size_t
ext2fs_read(File *file, char *buf, size_t size, off_t offset)
{
	SuperBlock *sb = file->inode->super;
	struct Ext2Inode inode;
	uint16_t min, indent = offset % PAGE_SIZE;
	size_t count = 0, i = offset / PAGE_SIZE;
	uint32_t blk;
	char ebuf[PAGE_SIZE];
	ext2fs_read_inode(sb, file->inode->ino, &inode);
	if (offset > inode.lsize)
		return 0;
	if (size + offset > inode.lsize)
		size = inode.lsize - offset;
	while (size) {
		min = (size > PAGE_SIZE) ? PAGE_SIZE : size;
		blk = ext2fs_get_data_addr(sb, &inode, i);
		ext2fs_read_block(sb, blk, ebuf);
		memcpy(buf + count, ebuf + indent, min);
		size -= min;
		count += min;
		indent = 0;
		i++;
	}
	return count;
}

/* Read an ext2fs directory entry */
int
ext2fs_readdir(File *file, DirEntry *de, off_t index)
{
	return 0;
}

/* Open an ext2fs file */
int
ext2fs_open(File *file)
{
	return 0;
}