libisofs-legacy/libisofs/ecma119_tree.c

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2006-08-24 19:24:38 +00:00
/* vim: set noet ts=8 sts=8 sw=8 : */
#include <string.h>
#include <wchar.h>
#include <stdlib.h>
#include <assert.h>
#include "ecma119.h"
#include "ecma119_tree.h"
#include "tree.h"
#include "util.h"
static size_t calc_dirent_len(struct ecma119_tree_node *n)
{
int ret = n->name ? strlen(n->name) + 33 : 34;
if (ret % 2) ret++;
return ret;
}
static struct ecma119_tree_node*
create_dir(struct ecma119_write_target *t,
struct ecma119_tree_node *parent,
struct iso_tree_node *iso)
{
struct ecma119_tree_node *ret;
assert(t && (!parent || parent->type == ECMA119_DIR)
&& iso && S_ISDIR(iso->attrib.st_mode));
ret = calloc(1, sizeof(struct ecma119_tree_node));
ret->name = iso->name ? ((t->iso_level == 1) ? iso_1_dirid(iso->name)
: iso_2_dirid(iso->name))
: NULL;
ret->dirent_len = calc_dirent_len(ret);
ret->iso_self = iso;
ret->target = t;
ret->type = ECMA119_DIR;
ret->parent = ret->dir.real_parent = parent;
ret->dir.depth = parent ? parent->dir.depth + 1 : 1;
ret->dir.nchildren = iso->nchildren;
ret->dir.children = calloc(1, sizeof(void*) * iso->nchildren);
return ret;
}
static struct ecma119_tree_node*
create_file(struct ecma119_write_target *t,
struct ecma119_tree_node *parent,
struct iso_tree_node *iso)
{
struct ecma119_tree_node *ret;
assert(t && iso && parent && parent->type == ECMA119_DIR);
ret = calloc(1, sizeof(struct ecma119_tree_node));
ret->name = iso->name ? ((t->iso_level == 1) ? iso_1_fileid(iso->name)
: iso_2_fileid(iso->name))
: NULL;
ret->dirent_len = calc_dirent_len(ret);
ret->parent = parent;
ret->iso_self = iso;
ret->target = t;
ret->type = ECMA119_FILE;
return ret;
}
static struct ecma119_tree_node*
create_tree(struct ecma119_write_target *t,
struct ecma119_tree_node *parent,
struct iso_tree_node *iso)
{
struct ecma119_tree_node *ret;
size_t i;
assert(t && iso);
ret = (S_ISDIR(iso->attrib.st_mode) ? create_dir : create_file)
(t, parent, iso);
for (i = 0; i < iso->nchildren; i++) {
ret->dir.children[i] = create_tree(t, ret, iso->children[i]);
}
return ret;
}
void
ecma119_tree_free(struct ecma119_tree_node *root)
{
size_t i;
if (root->type == ECMA119_DIR) {
for (i=0; i < root->dir.nchildren; i++) {
ecma119_tree_free(root->dir.children[i]);
}
free(root->dir.children);
}
free(root->name);
free(root);
}
static size_t
max_child_name_len(struct ecma119_tree_node *root)
{
size_t ret = 0, i;
assert(root->type == ECMA119_DIR);
for (i=0; i < root->dir.nchildren; i++) {
size_t len = strlen(root->dir.children[i]->name);
ret = MAX(ret, len);
}
return ret;
}
static void
reparent(struct ecma119_tree_node *child,
struct ecma119_tree_node *parent)
{
int found = 0;
size_t i;
struct ecma119_tree_node *placeholder;
assert(child && parent && parent->type == ECMA119_DIR && child->parent);
/* replace the child in the original parent with a placeholder */
for (i=0; i < child->parent->dir.nchildren; i++) {
if (child->parent->dir.children[i] == child) {
placeholder = create_file(child->target,
child->parent,
child->iso_self);
placeholder->file.real_me = child;
child->parent->dir.children[i] = placeholder;
found = 1;
break;
}
}
assert(found);
/* add the child to its new parent */
child->parent = parent;
parent->dir.nchildren++;
parent->dir.children = realloc( parent->dir.children,
sizeof(void*) * parent->dir.nchildren );
parent->dir.children[parent->dir.nchildren-1] = child;
}
/**
* Reorder the tree, if necessary, to ensure that
* - the depth is at most 8
* - each path length is at most 255 characters
*/
static void
reorder_tree(struct ecma119_tree_node *root,
struct ecma119_tree_node *cur)
{
size_t max_path;
assert(root && cur && cur->type == ECMA119_DIR);
cur->dir.depth = cur->parent ? cur->parent->dir.depth + 1 : 1;
cur->dir.path_len = cur->parent ? cur->parent->dir.path_len
+ strlen(cur->name) : 0;
max_path = cur->dir.path_len + cur->dir.depth + max_child_name_len(cur);
if (cur->dir.depth > 8 || max_path > 255) {
reparent(cur, root);
/* we are appended to the root's children now, so there is no
* need to recurse (the root will hit us again) */
} else {
size_t i;
for (i=0; i < cur->dir.nchildren; i++) {
if (cur->dir.children[i]->type == ECMA119_DIR)
reorder_tree(root, cur->dir.children[i]);
}
}
}
static int
cmp_node(const void *f1, const void *f2)
{
struct ecma119_tree_node *f = *((struct ecma119_tree_node**)f1);
struct ecma119_tree_node *g = *((struct ecma119_tree_node**)f2);
return strcmp(f->name, g->name);
}
static void
sort_tree(struct ecma119_tree_node *root)
{
size_t i;
assert(root && root->type == ECMA119_DIR);
qsort(root->dir.children, root->dir.nchildren, sizeof(void*), cmp_node);
for (i=0; i < root->dir.nchildren; i++) {
if (root->dir.children[i]->type == ECMA119_DIR)
sort_tree(root->dir.children[i]);
}
}
/**
* Change num_change characters of the given filename in order to ensure the
* name is unique. If the name is short enough (depending on the ISO level),
* we can append the characters instead of changing them.
*
* \p seq_num is the index of this file in the sequence of identical filenames.
*
* For example, seq_num=3, num_change=2, name="HELLOTHERE.TXT" changes name to
* "HELLOTHE03.TXT"
*/
static void
mangle_name(char **name, int num_change, int level, int seq_num)
{
char *dot = strrchr(*name, '.');
char *semi = strrchr(*name, ';');
size_t len = strlen(*name);
char base[len+1], ext[len+1];
char fmt[12];
size_t baselen, extlen;
if (num_change >= len) {
return;
}
strncpy(base, *name, len+1);
if (dot) {
base[dot - *name] = '\0';
strncpy(ext, dot+1, len+1);
if (semi) {
ext[semi - dot - 1] = '\0';
}
} else {
base[len-2] = '\0';
ext[0] = '\0';
}
baselen = strlen(base);
extlen = strlen(ext);
if (level == 1 && baselen + num_change > 8) {
base[8 - num_change] = '\0';
} else if (level != 1 && baselen + extlen + num_change > 30) {
base[30 - extlen - num_change] = '\0';
}
sprintf(fmt, "%%s%%0%1dd.%%s;1", num_change);
*name = realloc(*name, baselen + extlen + num_change + 4);
sprintf(*name, fmt, base, seq_num, ext);
}
static void
mangle_all(struct ecma119_tree_node *dir)
{
size_t i, j, k;
struct ecma119_dir_info d = dir->dir;
size_t n_change;
int changed;
assert(dir->type == ECMA119_DIR);
do {
changed = 0;
for (i=0; i < d.nchildren; i++) {
/* find the number of consecutive equal names */
j = 1;
while ( i+j < d.nchildren &&
!strcmp(d.children[i]->name,
d.children[i+j]->name) )
j++;
if (j == 1) continue;
/* mangle the names */
changed = 1;
n_change = j / 10 + 1;
for (k=0; k < j; k++) {
mangle_name(&(d.children[i+k]->name),
n_change,
dir->target->iso_level,
k);
d.children[i+k]->dirent_len =
calc_dirent_len(d.children[i+k]);
}
/* skip ahead by the number of mangled names */
i += j - 1;
}
} while (changed);
for (i=0; i < d.nchildren; i++) {
if (d.children[i]->type == ECMA119_DIR)
mangle_all(d.children[i]);
}
}
struct ecma119_tree_node*
ecma119_tree_create(struct ecma119_write_target *t,
struct iso_tree_node *iso_root)
{
t->root = create_tree(t, NULL, iso_root);
reorder_tree(t->root, t->root);
sort_tree(t->root);
mangle_all(t->root);
return t->root;
}
void
ecma119_tree_print(struct ecma119_tree_node *root, int spaces)
{
size_t i;
char sp[spaces+1];
memset(sp, ' ', spaces);
sp[spaces] = '\0';
printf("%s%s\n", sp, root->name);
if (root->type == ECMA119_DIR)
for (i=0; i < root->dir.nchildren; i++)
ecma119_tree_print(root->dir.children[i], spaces+2);
}