420 lines
12 KiB
C
420 lines
12 KiB
C
/*
|
|
* Copyright (c) 2007 Vreixo Formoso
|
|
*
|
|
* This file is part of the libisofs project; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation. See COPYING file for details.
|
|
*/
|
|
|
|
/*
|
|
* This file contains functions related to the reading of SUSP and
|
|
* Rock Ridge extensions on an ECMA-119 image.
|
|
*/
|
|
|
|
#include "libisofs.h"
|
|
#include "ecma119.h"
|
|
#include "util.h"
|
|
#include "rockridge.h"
|
|
#include "messages.h"
|
|
|
|
#include <sys/stat.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
struct susp_iterator
|
|
{
|
|
uint8_t* base;
|
|
int pos;
|
|
int size;
|
|
IsoDataSource *src;
|
|
int msgid;
|
|
|
|
/* block and offset for next continuation area */
|
|
uint32_t ce_block;
|
|
uint32_t ce_off;
|
|
|
|
/** Length of the next continuation area, 0 if no more CA are specified */
|
|
uint32_t ce_len;
|
|
|
|
uint8_t *buffer; /*< If there are continuation areas */
|
|
};
|
|
|
|
SuspIterator*
|
|
susp_iter_new(IsoDataSource *src, struct ecma119_dir_record *record,
|
|
uint8_t len_skp, int msgid)
|
|
{
|
|
int pad = (record->len_fi[0] + 1) % 2;
|
|
struct susp_iterator *iter = malloc(sizeof(struct susp_iterator));
|
|
if (iter == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
iter->base = record->file_id + record->len_fi[0] + pad;
|
|
iter->pos = len_skp; /* 0 in most cases */
|
|
iter->size = record->len_dr[0] - record->len_fi[0] - 33 - pad;
|
|
iter->src = src;
|
|
iter->msgid = msgid;
|
|
|
|
iter->ce_len = 0;
|
|
iter->buffer = NULL;
|
|
|
|
return iter;
|
|
}
|
|
|
|
int susp_iter_next(SuspIterator *iter, struct susp_sys_user_entry **sue)
|
|
{
|
|
struct susp_sys_user_entry *entry;
|
|
|
|
entry = (struct susp_sys_user_entry*)(iter->base + iter->pos);
|
|
|
|
if ( (iter->pos + 4 > iter->size) || (SUSP_SIG(entry, 'S', 'T'))) {
|
|
|
|
/*
|
|
* End of the System Use Area or Continuation Area.
|
|
* Note that ST is not needed when the space left is less than 4.
|
|
* (IEEE 1281, SUSP. section 4)
|
|
*/
|
|
if (iter->ce_len) {
|
|
uint32_t block;
|
|
int nblocks;
|
|
|
|
/* A CE has found, there is another continuation area */
|
|
nblocks = DIV_UP(iter->ce_off + iter->ce_len, BLOCK_SIZE);
|
|
iter->buffer = realloc(iter->buffer, nblocks * BLOCK_SIZE);
|
|
|
|
/* read all blocks needed to cache the full CE */
|
|
for (block = 0; block < nblocks; ++block) {
|
|
int ret;
|
|
ret = iter->src->read_block(iter->src, iter->ce_block + block,
|
|
iter->buffer + block * BLOCK_SIZE);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
iter->base = iter->buffer + iter->ce_off;
|
|
iter->pos = 0;
|
|
iter->size = iter->ce_len;
|
|
iter->ce_len = 0;
|
|
entry = (struct susp_sys_user_entry*)iter->base;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (entry->len_sue[0] == 0) {
|
|
/* a wrong image with this lead us to a infinity loop */
|
|
iso_msg_submit(iter->msgid, ISO_WRONG_RR, 0,
|
|
"Damaged RR/SUSP information.");
|
|
return ISO_WRONG_RR;
|
|
}
|
|
|
|
iter->pos += entry->len_sue[0];
|
|
|
|
if (SUSP_SIG(entry, 'C', 'E')) {
|
|
/* Continuation entry */
|
|
if (iter->ce_len) {
|
|
int ret;
|
|
ret = iso_msg_submit(iter->msgid, ISO_UNSUPPORTED_SUSP, 0,
|
|
"More than one CE System user entry has found in a single "
|
|
"System Use field or continuation area. This breaks SUSP "
|
|
"standard and it's not supported. Ignoring last CE. Maybe "
|
|
"the image is damaged.");
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
} else {
|
|
iter->ce_block = iso_read_bb(entry->data.CE.block, 4, NULL);
|
|
iter->ce_off = iso_read_bb(entry->data.CE.offset, 4, NULL);
|
|
iter->ce_len = iso_read_bb(entry->data.CE.len, 4, NULL);
|
|
}
|
|
|
|
/* we don't want to return CE entry to the user */
|
|
return susp_iter_next(iter, sue);
|
|
} else if (SUSP_SIG(entry, 'P', 'D')) {
|
|
/* skip padding */
|
|
return susp_iter_next(iter, sue);
|
|
}
|
|
|
|
*sue = entry;
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
void susp_iter_free(SuspIterator *iter)
|
|
{
|
|
free(iter->buffer);
|
|
free(iter);
|
|
}
|
|
|
|
/**
|
|
* Fills a struct stat with the values of a Rock Ridge PX entry (RRIP, 4.1.1).
|
|
*
|
|
* @return
|
|
* 1 on success, < 0 on error
|
|
*/
|
|
int read_rr_PX(struct susp_sys_user_entry *px, struct stat *st)
|
|
{
|
|
if (px == NULL || st == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
if (px->sig[0] != 'P' || px->sig[1] != 'X') {
|
|
return ISO_WRONG_ARG_VALUE;
|
|
}
|
|
|
|
if (px->len_sue[0] != 44 && px->len_sue[0] != 36) {
|
|
return ISO_WRONG_RR;
|
|
}
|
|
|
|
st->st_mode = iso_read_bb(px->data.PX.mode, 4, NULL);
|
|
st->st_nlink = iso_read_bb(px->data.PX.links, 4, NULL);
|
|
st->st_uid = iso_read_bb(px->data.PX.uid, 4, NULL);
|
|
st->st_gid = iso_read_bb(px->data.PX.gid, 4, NULL);
|
|
if (px->len_sue[0] == 44) {
|
|
/* this corresponds to RRIP 1.12, so we have inode serial number */
|
|
st->st_ino = iso_read_bb(px->data.PX.serial, 4, NULL);
|
|
}
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Fills a struct stat with the values of a Rock Ridge TF entry (RRIP, 4.1.6)
|
|
*
|
|
* @return
|
|
* 1 on success, < 0 on error
|
|
*/
|
|
int read_rr_TF(struct susp_sys_user_entry *tf, struct stat *st)
|
|
{
|
|
time_t time;
|
|
int s;
|
|
int nts = 0;
|
|
|
|
if (tf == NULL || st == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
if (tf->sig[0] != 'T' || tf->sig[1] != 'F') {
|
|
return ISO_WRONG_ARG_VALUE;
|
|
}
|
|
|
|
if (tf->data.TF.flags[0] & (1 << 7)) {
|
|
/* long form */
|
|
s = 17;
|
|
} else {
|
|
s = 7;
|
|
}
|
|
|
|
/* 1. Creation time */
|
|
if (tf->data.TF.flags[0] & (1 << 0)) {
|
|
|
|
/* the creation is the recording time. we ignore this */
|
|
/* TODO maybe it would be good to manage it in ms discs, where
|
|
* the recording time could be different than now!! */
|
|
++nts;
|
|
}
|
|
|
|
/* 2. modify time */
|
|
if (tf->data.TF.flags[0] & (1 << 1)) {
|
|
if (tf->len_sue[0] < 5 + (nts+1) * s) {
|
|
/* RR TF entry too short. */
|
|
return ISO_WRONG_RR;
|
|
}
|
|
if (s == 7) {
|
|
time = iso_datetime_read_7(&tf->data.TF.t_stamps[nts*7]);
|
|
} else {
|
|
time = iso_datetime_read_17(&tf->data.TF.t_stamps[nts*17]);
|
|
}
|
|
st->st_mtime = time;
|
|
++nts;
|
|
}
|
|
|
|
/* 3. access time */
|
|
if (tf->data.TF.flags[0] & (1 << 2)) {
|
|
if (tf->len_sue[0] < 5 + (nts+1) * s) {
|
|
/* RR TF entry too short. */
|
|
return ISO_WRONG_RR;
|
|
}
|
|
if (s == 7) {
|
|
time = iso_datetime_read_7(&tf->data.TF.t_stamps[nts*7]);
|
|
} else {
|
|
time = iso_datetime_read_17(&tf->data.TF.t_stamps[nts*17]);
|
|
}
|
|
st->st_atime = time;
|
|
++nts;
|
|
}
|
|
|
|
/* 4. attributes time */
|
|
if (tf->data.TF.flags[0] & (1 << 3)) {
|
|
if (tf->len_sue[0] < 5 + (nts+1) * s) {
|
|
/* RR TF entry too short. */
|
|
return ISO_WRONG_RR;
|
|
}
|
|
if (s == 7) {
|
|
time = iso_datetime_read_7(&tf->data.TF.t_stamps[nts*7]);
|
|
} else {
|
|
time = iso_datetime_read_17(&tf->data.TF.t_stamps[nts*17]);
|
|
}
|
|
st->st_ctime = time;
|
|
++nts;
|
|
}
|
|
|
|
/* we ignore backup, expire and effect times */
|
|
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Read a RR NM entry (RRIP, 4.1.4), and appends the name stored there to
|
|
* the given name. You can pass a pointer to NULL as name.
|
|
*
|
|
* @return
|
|
* 1 on success, < 0 on error
|
|
*/
|
|
int read_rr_NM(struct susp_sys_user_entry *nm, char **name, int *cont)
|
|
{
|
|
if (nm == NULL || name == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
if (nm->sig[0] != 'N' || nm->sig[1] != 'M') {
|
|
return ISO_WRONG_ARG_VALUE;
|
|
}
|
|
|
|
if (nm->len_sue[0] == 5) {
|
|
if (nm->data.NM.flags[0] & 0x2) {
|
|
/* it is a "." entry */
|
|
if (*name == NULL) {
|
|
return ISO_SUCCESS;
|
|
} else {
|
|
/* we can't have a previous not-NULL name */
|
|
return ISO_WRONG_RR;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (nm->len_sue[0] <= 5) {
|
|
/* ".." entry is an error, as we will never call it */
|
|
return ISO_WRONG_RR;
|
|
}
|
|
|
|
/* concatenate the results */
|
|
if (*cont) {
|
|
*name = realloc(*name, strlen(*name) + nm->len_sue[0] - 5 + 1);
|
|
strncat(*name, (char*)nm->data.NM.name, nm->len_sue[0] - 5);
|
|
} else {
|
|
*name = strcopy((char*)nm->data.NM.name, nm->len_sue[0] - 5);
|
|
}
|
|
if (*name == NULL) {
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
|
|
/* and set cond according to the value of CONTINUE flag */
|
|
*cont = nm->data.NM.flags[0] & 0x01;
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Read a SL RR entry (RRIP, 4.1.3), checking if the destination continues.
|
|
*
|
|
* @param cont
|
|
* 0 not continue, 1 continue, 2 continue component
|
|
* @return
|
|
* 1 on success, < 0 on error
|
|
*/
|
|
int read_rr_SL(struct susp_sys_user_entry *sl, char **dest, int *cont)
|
|
{
|
|
int pos;
|
|
|
|
if (sl == NULL || dest == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
if (sl->sig[0] != 'S' || sl->sig[1] != 'L') {
|
|
return ISO_WRONG_ARG_VALUE;
|
|
}
|
|
|
|
for (pos = 0; pos + 5 < sl->len_sue[0];
|
|
pos += 2 + sl->data.SL.comps[pos + 1]) {
|
|
char *comp;
|
|
uint8_t len;
|
|
uint8_t flags = sl->data.SL.comps[pos];
|
|
|
|
if (flags & 0x2) {
|
|
/* current directory */
|
|
len = 1;
|
|
comp = ".";
|
|
} else if (flags & 0x4) {
|
|
/* parent directory */
|
|
len = 2;
|
|
comp = "..";
|
|
} else if (flags & 0x8) {
|
|
/* root directory */
|
|
len = 1;
|
|
comp = "/";
|
|
} else if (flags & ~0x01) {
|
|
/* unsupported flag component */
|
|
return ISO_UNSUPPORTED_RR;
|
|
} else {
|
|
len = sl->data.SL.comps[pos + 1];
|
|
comp = (char*)&sl->data.SL.comps[pos + 2];
|
|
}
|
|
|
|
if (*cont == 1) {
|
|
/* new component */
|
|
size_t size = strlen(*dest);
|
|
*dest = realloc(*dest, strlen(*dest) + len + 2);
|
|
if (*dest == NULL) {
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
/* it is a new compoenent, add the '/' */
|
|
if ((*dest)[size-1] != '/') {
|
|
(*dest)[size] = '/';
|
|
(*dest)[size+1] = '\0';
|
|
}
|
|
strncat(*dest, comp, len);
|
|
} else if (*cont == 2) {
|
|
/* the component continues */
|
|
*dest = realloc(*dest, strlen(*dest) + len + 1);
|
|
if (*dest == NULL) {
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
/* we don't have to add the '/' */
|
|
strncat(*dest, comp, len);
|
|
} else {
|
|
*dest = strcopy(comp, len);
|
|
}
|
|
if (*dest == NULL) {
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
/* do the component continue or not? */
|
|
*cont = (flags & 0x01) ? 2 : 1;
|
|
}
|
|
|
|
if (*cont == 2) {
|
|
/* TODO check that SL flag is set to continute too ?*/
|
|
} else {
|
|
*cont = sl->data.SL.flags[0] & 0x1 ? 1 : 0;
|
|
}
|
|
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Fills a struct stat with the values of a Rock Ridge PN entry (RRIP, 4.1.2).
|
|
*
|
|
* @return
|
|
* 1 on success, < 0 on error
|
|
*/
|
|
int read_rr_PN(struct susp_sys_user_entry *pn, struct stat *st)
|
|
{
|
|
if (pn == NULL || pn == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
if (pn->sig[0] != 'P' || pn->sig[1] != 'N') {
|
|
return ISO_WRONG_ARG_VALUE;
|
|
}
|
|
|
|
if (pn->len_sue[0] != 20) {
|
|
return ISO_WRONG_RR;
|
|
}
|
|
|
|
st->st_rdev = (dev_t)((dev_t)iso_read_bb(pn->data.PN.high, 4, NULL) << 32)
|
|
|| (dev_t)iso_read_bb(pn->data.PN.low, 4, NULL);
|
|
return ISO_SUCCESS;
|
|
}
|