/*
* call-seq:
* read(filename_base) -> Trie
*
* Returns a new trie with data as read from disk.
*/
static VALUE rb_trie_read(VALUE self, VALUE filename_base) {
VALUE da_filename = rb_str_dup(filename_base);
VALUE tail_filename = rb_str_dup(filename_base);
rb_str_concat(da_filename, rb_str_new2(".da"));
rb_str_concat(tail_filename, rb_str_new2(".tail"));
StringValue(tail_filename);
StringValue(da_filename);
Trie *trie = trie_new();
VALUE obj;
obj = Data_Wrap_Struct(self, 0, trie_free, trie);
DArray *old_da = trie->da;
Tail *old_tail = trie->tail;
FILE *da_file = fopen(RSTRING_PTR(da_filename), "r");
if (da_file == NULL)
raise_ioerror("Error reading .da file.");
trie->da = da_read(da_file);
fclose(da_file);
FILE *tail_file = fopen(RSTRING_PTR(tail_filename), "r");
if (tail_file == NULL)
raise_ioerror("Error reading .tail file.");
trie->tail = tail_read(tail_file);
fclose(tail_file);
da_free(old_da);
tail_free(old_tail);
return obj;
}
/**
* @brief Create a new trie by loading from a file
*
* @param path : the path to the file
*
* @return a pointer to the created trie, NULL on failure
*
* Create a new trie and initialize its contents by loading from the file at
* given @a path.
*
* The created object must be freed with trie_free().
*/
Trie *
trie_new_from_file (const char *path)
{
Trie *trie;
FILE *trie_file;
trie_file = fopen (path, "r");
if (!trie_file)
return NULL;
trie = (Trie *) malloc (sizeof (Trie));
if (!trie)
goto exit_file_openned;
if (NULL == (trie->alpha_map = alpha_map_read_bin (trie_file)))
goto exit_trie_created;
if (NULL == (trie->da = da_read (trie_file)))
goto exit_alpha_map_created;
if (NULL == (trie->tail = tail_read (trie_file)))
goto exit_da_created;
fclose (trie_file);
trie->is_dirty = FALSE;
return trie;
exit_da_created:
da_free (trie->da);
exit_alpha_map_created:
alpha_map_free (trie->alpha_map);
exit_trie_created:
free (trie);
exit_file_openned:
fclose (trie_file);
return NULL;
}
// pass data from PNG file in memory to libpng
static void io_read(png_struct* png_ptr, u8* data, png_size_t length)
{
DynArray* da = (DynArray*)png_get_io_ptr(png_ptr);
if(da_read(da, data, length) != 0)
png_error(png_ptr, "io_read failed");
}
