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Adjusting symbolic links in HFS+ which are affected by name mangling

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This commit is contained in:
Thomas Schmitt 2012-07-02 19:57:25 +02:00
parent 7a8995f322
commit e8f6f924bd
3 changed files with 183 additions and 34 deletions
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200
libisofs/hfsplus.c
View File

@ -369,6 +369,7 @@ int create_tree(Ecma119Image *t, IsoNode *iso, uint32_t parent_id)
return ret;
t->hfsp_leafs[t->hfsp_curleaf].cat_id = cat_id;
t->hfsp_leafs[t->hfsp_curleaf].unix_type = UNIX_NONE;
t->hfsp_leafs[t->hfsp_curleaf].symlink_dest = NULL;
switch (iso->type)
{
@ -376,7 +377,9 @@ int create_tree(Ecma119Image *t, IsoNode *iso, uint32_t parent_id)
{
IsoSymlink *sym = (IsoSymlink*) iso;
t->hfsp_leafs[t->hfsp_curleaf].type = HFSPLUS_FILE;
t->hfsp_leafs[t->hfsp_curleaf].symlink_size = strlen (sym->dest);
t->hfsp_leafs[t->hfsp_curleaf].symlink_dest = strdup(sym->dest);
if (t->hfsp_leafs[t->hfsp_curleaf].symlink_dest == NULL)
return ISO_OUT_OF_MEM;
t->hfsp_leafs[t->hfsp_curleaf].unix_type = UNIX_SYMLINK;
t->hfsp_leafs[t->hfsp_curleaf].used_size = t->hfsp_leafs[t->hfsp_curleaf].strlen * 2 + 8 + 2 + sizeof (struct hfsplus_catfile_common) + 2 * sizeof (struct hfsplus_forkdata);
break;
@ -590,10 +593,9 @@ int hfsplus_writer_compute_data_blocks(IsoImageWriter *writer)
for (i = 0; i < t->hfsp_nleafs; i++)
if (t->hfsp_leafs[i].unix_type == UNIX_SYMLINK)
{
t->hfsp_leafs[i].symlink_block = hfsp_curblock;
hfsp_curblock += (t->hfsp_leafs[i].symlink_size + block_size - 1) / block_size;
hfsp_curblock += (strlen(t->hfsp_leafs[i].symlink_dest) +
block_size - 1) / block_size;
}
t->curblock = hfsp_curblock / block_fac;
@ -1000,7 +1002,7 @@ iso_msg_debug(t->image->id,
if (t->hfsp_leafs[curnode].unix_type == UNIX_SYMLINK)
{
blk = t->hfsp_leafs[curnode].symlink_block;
sz = t->hfsp_leafs[curnode].symlink_size;
sz = strlen(t->hfsp_leafs[curnode].symlink_dest);
}
else if (t->hfsp_leafs[curnode].unix_type == UNIX_SPECIAL)
{
@ -1076,12 +1078,13 @@ iso_msg_debug(t->image->id,
for (i = 0; i < t->hfsp_nleafs; i++)
if (t->hfsp_leafs[i].unix_type == UNIX_SYMLINK)
{
IsoSymlink *sym = (IsoSymlink*) t->hfsp_leafs[i].node;
int overhead;
ret = iso_write(t, sym->dest, t->hfsp_leafs[i].symlink_size);
ret = iso_write(t, t->hfsp_leafs[i].symlink_dest,
strlen(t->hfsp_leafs[i].symlink_dest));
if (ret < 0)
return ret;
overhead = t->hfsp_leafs[i].symlink_size % block_size;
overhead = strlen(t->hfsp_leafs[i].symlink_dest) % block_size;
if (overhead)
overhead = block_size - overhead;
ret = iso_write(t, buffer, overhead);
@ -1185,6 +1188,8 @@ int hfsplus_writer_free_data(IsoImageWriter *writer)
{
free (t->hfsp_leafs[i].name);
free (t->hfsp_leafs[i].cmp_name);
if (t->hfsp_leafs[i].symlink_dest != NULL)
free (t->hfsp_leafs[i].symlink_dest);
}
free(t->hfsp_leafs);
for (i = 0; i < t->hfsp_nlevels; i++)
@ -1256,25 +1261,181 @@ void rotate_hfs_list(Ecma119Image *target, uint32_t old_idx, uint32_t new_idx,
memcpy(&target->hfsp_leafs[new_idx], &tr, sz);
}
static
int subst_symlink_dest_comp(Ecma119Image *target, uint32_t idx,
char **dest, unsigned int *dest_len,
char **comp_start, char **comp_end,
char *new_name, int flag)
{
int new_len;
unsigned int new_dest_len;
char *new_dest, *wpt;
new_len = strlen(new_name);
new_dest_len =
*comp_start - *dest + new_len + *dest_len - (*comp_end - *dest);
new_dest = calloc(1, new_dest_len + 1);
if (new_dest == NULL)
return ISO_OUT_OF_MEM;
wpt = new_dest;
if (*comp_start - *dest > 0)
memcpy(wpt, *dest, *comp_start - *dest);
wpt += *comp_start - *dest;
memcpy(wpt, new_name, new_len);
wpt += new_len;
if (*comp_end - *dest < *dest_len)
memcpy(wpt, *comp_end, *dest_len - (*comp_end - *dest));
wpt += *dest_len - (*comp_end - *dest);
*wpt = 0;
*comp_start = new_dest + (*comp_start - *dest);
*comp_end = *comp_start + new_len;
target->hfsp_leafs[idx].symlink_dest = new_dest;
*dest_len = new_dest_len;
free(*dest);
*dest = new_dest;
return ISO_SUCCESS;
}
/* A specialized version of API call iso_tree_resolve_symlink().
It updates symlink destination components which lead to the
HFS+ node [changed_idx] in sync with resolution of the IsoImage
destination path.
It seems too much prone to weird link loopings if one would let
a function underneath iso_tree_resolve_symlink() watch out for
the IsoNode in question. Multiple passes through that node are
possible.
So this function exchanges components when encountered.
*/
static
int update_symlink(Ecma119Image *target, uint32_t changed_idx, char *new_name,
uint32_t link_idx, int *depth, int flag)
{
IsoSymlink *sym;
IsoDir *cur_dir = NULL;
IsoNode *n, *resolved_node;
char *orig_dest, *orig_start, *orig_end;
char *hfsp_dest, *hfsp_start, *hfsp_end;
int ret = 0;
unsigned int comp_len, orig_len, hfsp_len, hfsp_comp_len;
if (target->hfsp_leafs[link_idx].node->type != LIBISO_SYMLINK)
return ISO_SUCCESS;
sym = (IsoSymlink *) target->hfsp_leafs[link_idx].node;
orig_dest = sym->dest;
orig_len = strlen(orig_dest);
hfsp_dest = target->hfsp_leafs[link_idx].symlink_dest;
hfsp_len = strlen(hfsp_dest);
if (orig_dest[0] == '/') {
/* >>> ??? How to salvage absolute links without knowing the
path of the future mount point ?
??? Would it be better to leave them as is ?
I can only assume that it gets mounted at / during some stage
of booting.
*/;
cur_dir = target->image->root;
orig_end = orig_dest;
} else {
cur_dir = sym->node.parent;
if (cur_dir == NULL)
cur_dir = target->image->root;
orig_end = orig_dest - 1;
}
if (hfsp_dest[0] == '/')
hfsp_end = hfsp_dest;
else
hfsp_end = hfsp_dest - 1;
while (orig_end < orig_dest + orig_len) {
orig_start = orig_end + 1;
hfsp_start = hfsp_end + 1;
orig_end = strchr(orig_start, '/');
if (orig_end == NULL)
orig_end = orig_start + strlen(orig_start);
comp_len = orig_end - orig_start;
hfsp_end = strchr(hfsp_start, '/');
if (hfsp_end == NULL)
hfsp_end = hfsp_start + strlen(hfsp_start);
hfsp_comp_len = hfsp_end - hfsp_start;
if (comp_len == 0 || (comp_len == 1 && orig_start[0] == '.'))
continue;
if (comp_len == 2 && orig_start[0] == '.' && orig_start[1] == '.') {
cur_dir = cur_dir->node.parent;
if (cur_dir == NULL) /* link shoots over root */
return ISO_SUCCESS;
continue;
}
/* Search node in cur_dir */
for (n = cur_dir->children; n != NULL; n = n->next)
if (strncmp(orig_start, n->name, comp_len) == 0 &&
strlen(n->name) == comp_len)
break;
if (n == NULL) /* dead link */
return ISO_SUCCESS;
if (n == target->hfsp_leafs[changed_idx].node) {
iso_msg_debug(target->image->id,
" link path '%s' touches RR '%s', HFS+ '%s'",
orig_dest, (n->name != NULL ? n->name : ""),
new_name);
/* Exchange HFS+ component by new_name */
ret = subst_symlink_dest_comp(target, link_idx,
&hfsp_dest, &hfsp_len,
&hfsp_start, &hfsp_end, new_name, 0);
if (ret < 0)
return ret;
}
if (n->type == LIBISO_DIR) {
cur_dir = (IsoDir *) n;
} else if (n->type == LIBISO_SYMLINK) {
/* Resolve link and check whether it is a directory */
if (*depth >= LIBISO_MAX_LINK_DEPTH)
return ISO_SUCCESS;
(*depth)++;
ret = iso_tree_resolve_symlink(target->image, (IsoSymlink *) n,
&resolved_node, depth, 0);
if (ret == (int) ISO_DEAD_SYMLINK || ret == (int) ISO_DEEP_SYMLINK)
return ISO_SUCCESS;
if (ret < 0)
return ret;
if (resolved_node->type != LIBISO_DIR)
return ISO_SUCCESS;
cur_dir = (IsoDir *) resolved_node;
} else {
break;
}
}
return ISO_SUCCESS;
}
/* Find the other nodes with old_name and switch to new .name
One could make assumptions where name-followers are.
But then there are still the symbolic links. They can be located anywhere.
*/
static
int update_name_followers(Ecma119Image *target, uint32_t idx,
int update_name_followers(Ecma119Image *target, uint32_t idx, char *new_name,
uint16_t *old_name, uint16_t *old_cmp_name,
uint32_t old_strlen)
{
uint32_t i;
int ret, link_depth;
for (i = 0; i < target->hfsp_nleafs; i++) {
/* >>> check for symbolic links which point to old_name
But hfsplus_writer_write_data() takes the link destination
directly from the IsoNode.
So Libisofs_hfsplus_new_symlinK must be implemented.
*/;
if (target->hfsp_leafs[i].unix_type == UNIX_SYMLINK) {
link_depth = 0;
ret = update_symlink(target, idx, new_name, i, &link_depth, 0);
if (ret < 0)
return ret;
}
if (target->hfsp_leafs[i].name != old_name)
continue;
target->hfsp_leafs[i].name = target->hfsp_leafs[idx].name;
@ -1300,7 +1461,7 @@ int try_mangle(Ecma119Image *target, uint32_t idx, uint32_t prev_idx,
uint32_t *new_idx, char *prefix, int flag)
{
int i, ret = 0;
char new_name[256], number[9];
char new_name[LIBISO_HFSPLUS_NAME_MAX + 1], number[9];
uint16_t *old_name, *old_cmp_name;
uint32_t old_strlen;
@ -1313,7 +1474,7 @@ int try_mangle(Ecma119Image *target, uint32_t idx, uint32_t prev_idx,
number[0] = 0;
else
sprintf(number, "%X", (unsigned int) i);
if (strlen(prefix) + 1 + strlen(number) >= 256) {
if (strlen(prefix) + 1 + strlen(number) > LIBISO_HFSPLUS_NAME_MAX) {
ret = 0;
goto no_success;
}
@ -1355,6 +1516,7 @@ int try_mangle(Ecma119Image *target, uint32_t idx, uint32_t prev_idx,
#endif /* Libisofs_mangle_with_sort */
/* >>> Get full ISO-RR paths of colliding nodes */;
/* >>> iso_tree_get_node_path(node); */
iso_msg_debug(target->image->id,
"HFS+ name collision with \"%s\" : \"%s\" renamed to \"%s\"",
@ -1367,7 +1529,7 @@ int try_mangle(Ecma119Image *target, uint32_t idx, uint32_t prev_idx,
(target->hfsp_leafs[*new_idx].strlen - old_strlen) * 2;
if (!(flag & 1)) {
ret = update_name_followers(target, *new_idx,
ret = update_name_followers(target, *new_idx, new_name,
old_name, old_cmp_name, old_strlen);
if (ret < 0)
goto no_success;

15
libisofs/hfsplus.h
View File

@ -19,6 +19,7 @@
#define LIBISO_HFSPLUS_NAME_MAX 255
enum hfsplus_node_type {
HFSPLUS_DIR = 1,
HFSPLUS_FILE = 2,
@ -53,21 +54,7 @@ struct hfsplus_node
enum { UNIX_NONE, UNIX_SYMLINK, UNIX_SPECIAL } unix_type;
uint32_t symlink_block;
#ifdef Libisofs_hfsplus_new_symlinK
/* >>> Currently symlinks take their destination string from IsoNode.
This will not work after the destination name suffered a
case-sensitivity collision.
So it is necessary to store the string with the HFS+ node and
to adjust it during mangling.
>>> This is not yet implemented in hfsplus.c
*/
char *symlink_dest;
#else
uint32_t symlink_size;
#endif
enum hfsplus_node_type type;
IsoFileSrc *file;

2
libisofs/tree.c
View File

@ -1273,7 +1273,7 @@ leaf_type:;
return ISO_SUCCESS;
}
}
*res = cur_dir;
*res = (IsoNode *) cur_dir;
return ISO_SUCCESS;
}