sqliteio.c

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include "util.h"
#include "dir.h"
#include "namei.h"

struct mfs_volume* open_sqlite_volume(char* device_name)
{
	if (device_name == NULL) 
	{
		printf("ERROR: Set the correct device name\n");
		exit(1);
	}

	struct mfs_volume* volume = NULL;

	volume = open_volume(device_name, "r+b");

	if (volume == NULL) 
	{
		printf("ERROR: %s doesn't exist\n", device_name);
		exit(1);
	}

	return volume;
}

void open_sqlite_file(struct mfs_volume* volume, char* route, char* file_name)
{
	printf("mfs sqlite: open\n");

	int dentry_type = lookup_sqlite_file(volume, route, file_name);

	switch(dentry_type)
	{
		case FILE_DENTRY:
			printf("found file: %s\n", file_name);
			break;
		case DIR_DENTRY:
			printf("found dir: %s\n", file_name);
			break;
		default:
			printf("not found: %s\n", file_name);
			create_sqlite_file(volume, route, file_name);
			break;
	}
}

int lookup_sqlite_file(struct mfs_volume* volume, char* route, char* file_name)
{
	printf("mfs sqlite: lookup\n");
	return __mfs_lookup(volume, route, file_name);
}

void create_sqlite_file(struct mfs_volume* volume, char* route, char* file_name)
{
	printf("mfs sqlite: create\n");
	__mfs_create(volume, route, file_name);
}

int write_sqlite_file(struct mfs_volume* volume, char* route, char* file_name, char* buff, int len, u64_t offset)
{
	if(buff == NULL)
	{
		return -1;
	}
	printf("mfs sqlite: write %dB in %s%s:%d\n", len, route, file_name, offset);

	int n_write = 0;

	u128 cluster_number = get_cluster_number(volume, route);
	struct mfs_dirent dentry;

	get_dentry(volume, cluster_number, file_name, &dentry);

	n_write = write_file(volume, &dentry, buff, len, offset);

	alloc_new_entry(volume, cluster_number, file_name, &dentry);

	return n_write;
}

int read_sqlite_file(struct mfs_volume* volume, char* route, char* file_name, char* buff, int len, u64_t offset)
{
	if(buff == NULL)
	{
		return -1;
	}
	printf("mfs sqlite: read %dB in %s%s:%d\n", len, route, file_name, offset);

	int n_read = 0;

	u128 cluster_number = get_cluster_number(volume, route);
	struct mfs_dirent dentry;

	get_dentry(volume, cluster_number, file_name, &dentry);

	n_read = read_file(volume, &dentry, buff, len, offset);

	return n_read;
}