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/**
* @file
*
* @brief RTEMS Load Tarfs
* @ingroup IMFS
*/
/*
* COPYRIGHT (c) 1989-2010.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "imfs.h"
#include <sys/param.h>
#include <sys/stat.h>
#include <string.h>
#include <tar.h>
#include <unistd.h>
#include <rtems/untar.h>
#define MAX_NAME_FIELD_SIZE 99
int rtems_tarfs_load(
const char *mountpoint,
uint8_t *tar_image,
size_t tar_size
)
{
const char *hdr_ptr;
char filename[100];
char full_filename[256];
int hdr_chksum;
unsigned char linkflag;
unsigned long file_size;
unsigned long file_mode;
int offset;
unsigned long nblocks;
int rv = 0;
int eval_flags = RTEMS_FS_FOLLOW_LINK;
rtems_filesystem_eval_path_context_t ctx;
rtems_filesystem_location_info_t rootloc;
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_start( &ctx, mountpoint, eval_flags );
rtems_filesystem_eval_path_extract_currentloc( &ctx, &rootloc );
rtems_filesystem_eval_path_set_flags(
&ctx,
RTEMS_FS_MAKE | RTEMS_FS_EXCLUSIVE
);
if ( !IMFS_is_imfs_instance( &rootloc ) ) {
rv = -1;
}
/*
* Create an IMFS node structure pointing to tar image memory.
*/
offset = 0;
while ( rv == 0 ) {
if (offset + 512 > tar_size)
break;
/*
* Read a header.
*/
hdr_ptr = (char *) &tar_image[offset];
offset += 512;
if (strncmp(&hdr_ptr[257], "ustar", 5))
break;
strncpy(filename, hdr_ptr, MAX_NAME_FIELD_SIZE);
filename[MAX_NAME_FIELD_SIZE] = '\0';
linkflag = hdr_ptr[156];
file_mode = _rtems_octal2ulong(&hdr_ptr[100], 8);
file_size = _rtems_octal2ulong(&hdr_ptr[124], 12);
hdr_chksum = _rtems_octal2ulong(&hdr_ptr[148], 8);
if (_rtems_tar_header_checksum(hdr_ptr) != hdr_chksum)
break;
/*
* Generate an IMFS node depending on the file type.
* - For directories, just create directories as usual. IMFS
* will take care of the rest.
* - For symbolic links, create as usual
* - For files, create a file node with special tarfs properties.
*/
if (linkflag == DIRTYPE) {
int len;
strncpy(full_filename, mountpoint, 255);
if (full_filename[(len=strlen(full_filename))-1] != '/')
strcat(full_filename, "/");
++len;
strncat(full_filename, filename, 256-len-1);
rv = mkdir(full_filename, S_IRWXU | S_IRWXG | S_IRWXO);
}
/*
* Create a LINEAR_FILE node
*/
else if (linkflag == REGTYPE) {
rtems_filesystem_location_free( currentloc );
rtems_filesystem_location_clone( currentloc, &rootloc );
rtems_filesystem_eval_path_set_path(
&ctx,
filename,
strlen( filename )
);
rtems_filesystem_eval_path_continue( &ctx );
if ( !rtems_filesystem_location_is_null( currentloc ) ) {
IMFS_linearfile_t *linfile = (IMFS_linearfile_t *)
IMFS_create_node(
currentloc,
&IMFS_node_control_linfile,
sizeof( IMFS_file_t ),
rtems_filesystem_eval_path_get_token( &ctx ),
rtems_filesystem_eval_path_get_tokenlen( &ctx ),
(file_mode & (S_IRWXU | S_IRWXG | S_IRWXO)) | S_IFREG,
NULL
);
if ( linfile != NULL ) {
linfile->File.size = file_size;
linfile->direct = &tar_image[offset];
}
}
nblocks = (((file_size) + 511) & ~511) / 512;
offset += 512 * nblocks;
}
/*
* Create a symbolic link
*/
else if (linkflag == SYMTYPE) {
const char *linkto = hdr_ptr + 157;
int len;
strncpy(full_filename, mountpoint, 255);
if (full_filename[(len=strlen(full_filename))-1] != '/')
strcat(full_filename, "/");
++len;
strncat(full_filename, filename, 256-len-1);
rv = symlink(linkto, full_filename);
}
}
rtems_filesystem_location_free( &rootloc );
rtems_filesystem_eval_path_cleanup( &ctx );
return rv;
}
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