EMILE/libext2/ext2_open.c

/*
 *
 * (c) 2008 Laurent Vivier <Laurent@lvivier.info>
 *
 */

#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>

#include <stdio.h>

#include "libext2.h"
#include "ext2.h"
#include "ext2_utils.h"

stream_FILE* ext2_open(stream_VOLUME *volume, char* pathname)
{
	ext2_FILE *file;
	struct ext2_inode *inode;
	int ino;
	int ret;

	ino = ext2_seek_name((ext2_VOLUME*)volume, pathname);
	if (ino == 0)
		return NULL;

	inode = (struct ext2_inode*)malloc(sizeof(struct ext2_inode));
	if (inode == NULL)
		return NULL;

	ret = ext2_get_inode((ext2_VOLUME*)volume, ino, inode);
	if (ret == -1) {
		free(inode);
		return NULL;
	}
	if (S_ISLNK(inode->i_mode)) {
		static char buffer[1024];
		int i, last = 0;
		strcpy(buffer, pathname);
		for (i = 0; buffer[i]; i++)
			if (buffer[i] == '/')
				last = i;
		buffer[last] = '/';
		strcpy(buffer + last + 1, (char*)inode->i_block);
		ino = ext2_seek_name((ext2_VOLUME*)volume, buffer);
		if (ino == 0) {
			free(inode);
			return NULL;
		}
		ret = ext2_get_inode((ext2_VOLUME*)volume, ino, inode);
		if (ret == -1) {
			free(inode);
			return NULL;
		}
	}

	file = (ext2_FILE*)malloc(sizeof(ext2_FILE));
	if (file == NULL) {
		free(inode);
		return NULL;
	}
	file->volume = (ext2_VOLUME*)volume;
	file->inode = inode;
	file->offset = 0;

	return (stream_FILE*)file;
}