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Improve mangling algorithm, by using a hash table for name search.

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This commit is contained in:
Vreixo Formoso 2008-01-12 02:43:07 +01:00
parent 4b3a86185f
commit c00d84f0f2
2 changed files with 35 additions and 18 deletions
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3
demo/ecma119_tree.c
View File

@ -125,6 +125,9 @@ int main(int argc, char **argv)
printf("\n\n");
ecma119_node_free(ecma119->root);
iso_rbtree_destroy(ecma119->files, iso_file_src_free);
free(ecma119->input_charset);
free(ecma119);
iso_image_unref(image);
return 0;
}

50
src/ecma119_tree.c
View File

@ -385,19 +385,6 @@ void sort_tree(Ecma119Node *root)
}
}
static
int contains_name(Ecma119Node *dir, const char *name)
{
int i;
for (i = 0; i < dir->info.dir->nchildren; i++) {
Ecma119Node *child = dir->info.dir->children[i];
if (!strcmp(child->iso_name, name)) {
return 1;
}
}
return 0;
}
/**
* Ensures that the ISO name of each children of the given dir is unique,
* changing some of them if needed.
@ -409,13 +396,29 @@ static
int mangle_single_dir(Ecma119Image *img, Ecma119Node *dir, int max_file_len,
int max_dir_len)
{
int ret;
int i, nchildren;
Ecma119Node **children;
IsoHTable *table;
int need_sort = 0;
nchildren = dir->info.dir->nchildren;
children = dir->info.dir->children;
/* a hash table will temporary hold the names, for fast searching */
ret = iso_htable_create((nchildren * 100) / 80, iso_str_hash,
(compare_function_t)strcmp, &table);
if (ret < 0) {
return ret;
}
for (i = 0; i < nchildren; ++i) {
char *name = children[i]->iso_name;
ret = iso_htable_add(table, name, name);
if (ret < 0) {
goto mangle_cleanup;
}
}
for (i = 0; i < nchildren; ++i) {
char *name, *ext;
char full_name[40];
@ -483,7 +486,8 @@ int mangle_single_dir(Ecma119Image *img, Ecma119Node *dir, int max_file_len,
* error, we don't support extensions < 3
* This can't happen with current limit of digits.
*/
return ISO_ERROR;
ret = ISO_ERROR;
goto mangle_cleanup;
}
}
/* ok, reduce name by digits */
@ -523,7 +527,7 @@ int mangle_single_dir(Ecma119Image *img, Ecma119Node *dir, int max_file_len,
ok = 0;
break;
}
if (!contains_name(dir, tmp)) {
if (!iso_htable_get(table, tmp, NULL)) {
/* the name is unique, so it can be used */
break;
}
@ -531,13 +535,18 @@ int mangle_single_dir(Ecma119Image *img, Ecma119Node *dir, int max_file_len,
if (ok) {
char *new = strdup(tmp);
if (new == NULL) {
return ISO_MEM_ERROR;
ret = ISO_MEM_ERROR;
goto mangle_cleanup;
}
iso_msg_debug(img->image->messenger,
"\"%s\" renamed to \"%s\"",
children[k]->iso_name, new);
iso_htable_remove(table, children[k]->iso_name, NULL);
free(children[k]->iso_name);
children[k]->iso_name = new;
iso_htable_add(table, new, new);
/*
* if we change a name we need to sort again children
* at the end
@ -555,7 +564,8 @@ int mangle_single_dir(Ecma119Image *img, Ecma119Node *dir, int max_file_len,
}
}
if (digits == 8) {
return ISO_MANGLE_TOO_MUCH_FILES;
ret = ISO_MANGLE_TOO_MUCH_FILES;
goto mangle_cleanup;
}
i = j;
}
@ -567,7 +577,11 @@ int mangle_single_dir(Ecma119Image *img, Ecma119Node *dir, int max_file_len,
qsort(children, nchildren, sizeof(void*), cmp_node_name);
}
return ISO_SUCCESS;
ret = ISO_SUCCESS;
mangle_cleanup : ;
iso_htable_destroy(table, NULL);
return ret;
}
static