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#include <string.h>
#include <assert.h>
#include <glib.h>
#include "tag_utility.h"
/* internal taglib structure */
struct tag_entry{
int m_line_type;
char * m_line_tag;
int m_num_of_values;
char ** m_required_tags;
/* char ** m_optional_tags; */
/* int m_optional_count = 0; */
char ** m_ignored_tags;
};
tag_entry tag_entry_copy(int line_type, const char * line_tag,
int num_of_values,
char * required_tags[],
char * ignored_tags[]){
tag_entry entry;
entry.m_line_type = line_type;
entry.m_line_tag = g_strdup( line_tag );
entry.m_num_of_values = num_of_values;
entry.m_required_tags = g_strdupv( required_tags );
entry.m_ignored_tags = g_strdupv( ignored_tags );
return entry;
}
tag_entry tag_entry_clone(tag_entry * entry){
return tag_entry_copy(entry->m_line_type, entry->m_line_tag,
entry->m_num_of_values,
entry->m_required_tags, entry->m_ignored_tags);
}
void tag_entry_reclaim(tag_entry * entry){
g_free( entry->m_line_tag );
g_strfreev( entry->m_required_tags );
g_strfreev(entry->m_ignored_tags);
}
static bool taglib_free_tag_array(GArray * tag_array){
for ( size_t i = 0; i < tag_array->len; ++i) {
tag_entry * entry = &g_array_index(tag_array, tag_entry, i);
tag_entry_reclaim(entry);
}
g_array_free(tag_array, TRUE);
return true;
}
/* Pointer Array of Array of tag_entry */
static GPtrArray * g_tagutils_stack = NULL;
bool taglib_init(){
assert( g_tagutils_stack == NULL);
g_tagutils_stack = g_ptr_array_new();
GArray * tag_array = g_array_new(TRUE, TRUE, sizeof(tag_entry));
g_ptr_array_add(g_tagutils_stack, tag_array);
return true;
}
bool taglib_add_tag(int line_type, const char * line_tag, int num_of_values,
const char * required_tags[], const char * ignored_tags[]){
GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack,
g_tagutils_stack->len - 1);
/* some duplicate tagname or line_type check here. */
for ( size_t i = 0; i < tag_array->len; ++i) {
tag_entry * entry = &g_array_index(tag_array, tag_entry, i);
if ( entry->m_line_type == line_type ||
strcmp( entry->m_line_tag, line_tag ) == 0 )
return false;
}
tag_entry entry = tag_entry_copy(line_type, line_tag, num_of_values,
(char **)required_tags,
(char **)ignored_tags);
g_array_append_val(tag_array, entry);
return true;
}
static void ptr_array_entry_free(gpointer data, gpointer user_data){
g_free(data);
}
static gboolean hash_table_key_value_free(gpointer key, gpointer value,
gpointer user_data){
g_free(key);
g_free(value);
return TRUE;
}
bool taglib_read(const char * input_line, int & line_type, GPtrArray * values,
GHashTable * required){
/* reset values and required. */
g_ptr_array_foreach(values, ptr_array_entry_free, NULL);
g_ptr_array_set_size(values, 0);
g_hash_table_foreach_steal(required, hash_table_key_value_free, NULL);
/* use own version of string split
instead of g_strsplit_set for special token.*/
char ** tokens = g_strsplit_set(input_line, " \t", -1);
int num_of_tokens = g_strv_length(tokens);
char * line_tag = tokens[0];
GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, g_tagutils_stack->len - 1);
tag_entry * cur_entry = NULL;
/* find line type. */
for ( size_t i = 0; i < tag_array->len; ++i) {
tag_entry * entry = &g_array_index(tag_array, tag_entry, i);
if ( strcmp( entry->m_line_tag, line_tag ) == 0 ) {
cur_entry = entry;
break;
}
}
if ( !cur_entry )
return false;
line_type = cur_entry->m_line_type;
for ( int i = 1; i < cur_entry->m_num_of_values + 1; ++i) {
g_return_val_if_fail(i < num_of_tokens, false);
char * value = g_strdup( tokens[i] );
g_ptr_array_add(values, value);
}
for ( int i = cur_entry->m_num_of_values + 1; i < num_of_tokens; ++i){
g_return_val_if_fail(i < num_of_tokens, false);
char * key = g_strdup(tokens[i]);
++i;
g_return_val_if_fail(i < num_of_tokens, false);
char * value = g_strdup(tokens[i]);
g_hash_table_insert(required, key, value);
}
g_strfreev(tokens);
return true;
}
bool taglib_remove_tag(int line_type){
/* Note: duplicate entry check is in taglib_add_tag. */
GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, g_tagutils_stack->len - 1);
for ( size_t i = 0; i < tag_array->len; ++i) {
tag_entry * entry = &g_array_index(tag_array, tag_entry, i);
if (entry->m_line_type != line_type)
continue;
tag_entry_reclaim(entry);
g_array_remove_index(tag_array, i);
return true;
}
return false;
}
bool taglib_push_state(){
assert(g_tagutils_stack->len >= 1);
GArray * next_tag_array = g_array_new(TRUE, TRUE, sizeof(tag_entry));
GArray * prev_tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, g_tagutils_stack->len - 1);
for ( size_t i = 0; i < prev_tag_array->len; ++i) {
tag_entry * entry = &g_array_index(prev_tag_array, tag_entry, i);
tag_entry new_entry = tag_entry_clone(entry);
g_array_append_val(next_tag_array, new_entry);
}
g_ptr_array_add(g_tagutils_stack, next_tag_array);
return true;
}
bool taglib_pop_state(){
assert(g_tagutils_stack->len > 1);
GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, g_tagutils_stack->len - 1);
g_ptr_array_remove_index(g_tagutils_stack, g_tagutils_stack->len - 1);
taglib_free_tag_array(tag_array);
return true;
}
bool taglib_fini(){
for ( size_t i = 0; i < g_tagutils_stack->len; ++i){
GArray * tag_array = (GArray *) g_ptr_array_index(g_tagutils_stack, i);
taglib_free_tag_array(tag_array);
}
g_ptr_array_free(g_tagutils_stack, TRUE);
g_tagutils_stack = NULL;
return true;
}
void test(){
TAGLIB_BEGIN_ADD_TAG(1, "\\data", 0);
TAGLIB_REQUIRED_TAGS = {"model", NULL};
TAGLIB_IGNORED_TAGS = {"data", NULL};
TAGLIB_END_ADD_TAG;
}
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