/eet-1.4.1/src/examples/eet-data-file_descriptor.c
C | 506 lines | 410 code | 73 blank | 23 comment | 43 complexity | cd43135f53d3a6d056e5c98701cca436 MD5 | raw file
Possible License(s): BSD-3-Clause
- #include <Eina.h>
- #include <Eet.h>
- #include <stdio.h>
- #include <limits.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <unistd.h>
- // complex real-world structures based on elmdentica database
- typedef struct
- {
- const char * screen_name;
- const char * name;
- const char * message;
- unsigned int id;
- unsigned int status_id;
- unsigned int date;
- unsigned int timeline;
- } My_Message;
- typedef struct
- {
- const char * dm_to;
- const char * message;
- } My_Post;
- typedef struct
- {
- unsigned int id;
- const char * name;
- Eina_List * messages;
- Eina_List * posts;
- } My_Account;
- typedef struct
- {
- unsigned int version; // it is recommended to use versioned configuration!
- Eina_List * accounts;
- } My_Cache;
- // string that represents the entry in eet file, you might like to have
- // different profiles or so in the same file, this is possible with
- // different strings
- static const char MY_CACHE_FILE_ENTRY[] = "cache";
- // keep the descriptor static global, so it can be
- // shared by different functions (load/save) of this and only this
- // file.
- static Eet_Data_Descriptor * _my_cache_descriptor;
- static Eet_Data_Descriptor * _my_account_descriptor;
- static Eet_Data_Descriptor * _my_message_descriptor;
- static Eet_Data_Descriptor * _my_post_descriptor;
- // keep file handle alive, so mmap()ed strings are all alive as well
- static Eet_File * _my_cache_file = NULL;
- static Eet_Dictionary * _my_cache_dict = NULL;
- static void
- _my_cache_descriptor_init(void)
- {
- Eet_Data_Descriptor_Class eddc;
- // The FILE variant is good for caches and things that are just
- // appended, but needs to take care when changing strings and files must
- // be kept open so mmap()ed strings will be kept alive.
- EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET(&eddc, My_Cache);
- _my_cache_descriptor = eet_data_descriptor_file_new(&eddc);
- EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET(&eddc, My_Account);
- _my_account_descriptor = eet_data_descriptor_file_new(&eddc);
- EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET(&eddc, My_Message);
- _my_message_descriptor = eet_data_descriptor_file_new(&eddc);
- EET_EINA_FILE_DATA_DESCRIPTOR_CLASS_SET(&eddc, My_Post);
- _my_post_descriptor = eet_data_descriptor_file_new(&eddc);
- // Describe the members to be saved:
- // Use a temporary macro so we don't type a lot, also avoid errors:
- #define ADD_BASIC(member, eet_type)\
- EET_DATA_DESCRIPTOR_ADD_BASIC\
- (_my_message_descriptor, My_Message, # member, member, eet_type)
- ADD_BASIC(screen_name, EET_T_STRING);
- ADD_BASIC(name, EET_T_STRING);
- ADD_BASIC(message, EET_T_STRING);
- ADD_BASIC(id, EET_T_UINT);
- ADD_BASIC(status_id, EET_T_UINT);
- ADD_BASIC(date, EET_T_UINT);
- ADD_BASIC(timeline, EET_T_UINT);
- #undef ADD_BASIC
- #define ADD_BASIC(member, eet_type)\
- EET_DATA_DESCRIPTOR_ADD_BASIC\
- (_my_post_descriptor, My_Post, # member, member, eet_type)
- ADD_BASIC(dm_to, EET_T_STRING);
- ADD_BASIC(message, EET_T_STRING);
- #undef ADD_BASIC
- #define ADD_BASIC(member, eet_type)\
- EET_DATA_DESCRIPTOR_ADD_BASIC\
- (_my_account_descriptor, My_Account, # member, member, eet_type)
- ADD_BASIC(name, EET_T_STRING);
- ADD_BASIC(id, EET_T_UINT);
- #undef ADD_BASIC
- EET_DATA_DESCRIPTOR_ADD_LIST
- (_my_account_descriptor, My_Account, "messages", messages,
- _my_message_descriptor);
- EET_DATA_DESCRIPTOR_ADD_LIST
- (_my_account_descriptor, My_Account, "posts", posts,
- _my_post_descriptor);
- #define ADD_BASIC(member, eet_type)\
- EET_DATA_DESCRIPTOR_ADD_BASIC\
- (_my_cache_descriptor, My_Cache, # member, member, eet_type)
- ADD_BASIC(version, EET_T_UINT);
- #undef ADD_BASIC
- EET_DATA_DESCRIPTOR_ADD_LIST
- (_my_cache_descriptor, My_Cache, "accounts", accounts,
- _my_account_descriptor);
- } /* _my_cache_descriptor_init */
- static void
- _my_cache_descriptor_shutdown(void)
- {
- eet_data_descriptor_free(_my_cache_descriptor);
- eet_data_descriptor_free(_my_account_descriptor);
- eet_data_descriptor_free(_my_message_descriptor);
- eet_data_descriptor_free(_my_post_descriptor);
- } /* _my_cache_descriptor_shutdown */
- // need to check if the pointer came from mmaped area in eet_dictionary
- // or it was allocated with eina_stringshare_add()
- static void
- _eet_string_free(const char * str)
- {
- if (!str)
- return;
- if ((_my_cache_dict) && (eet_dictionary_string_check(_my_cache_dict, str)))
- return;
- eina_stringshare_del(str);
- } /* _eet_string_free */
- static My_Message *
- _my_message_new(const char * message)
- {
- My_Message * msg = calloc(1, sizeof(My_Message));
- if (!msg)
- {
- fprintf(stderr, "ERROR: could not calloc My_Message\n");
- return NULL;
- }
- msg->message = eina_stringshare_add(message);
- return msg;
- } /* _my_message_new */
- static void
- _my_message_free(My_Message * msg)
- {
- _eet_string_free(msg->screen_name);
- _eet_string_free(msg->name);
- _eet_string_free(msg->message);
- free(msg);
- } /* _my_message_free */
- static My_Post *
- _my_post_new(const char * message)
- {
- My_Post * post = calloc(1, sizeof(My_Post));
- if (!post)
- {
- fprintf(stderr, "ERROR: could not calloc My_Post\n");
- return NULL;
- }
- post->message = eina_stringshare_add(message);
- return post;
- } /* _my_post_new */
- static void
- _my_post_free(My_Post * post)
- {
- _eet_string_free(post->dm_to);
- _eet_string_free(post->message);
- free(post);
- } /* _my_post_free */
- static My_Account *
- _my_account_new(const char * name)
- {
- My_Account * acc = calloc(1, sizeof(My_Account));
- if (!acc)
- {
- fprintf(stderr, "ERROR: could not calloc My_Account\n");
- return NULL;
- }
- acc->name = eina_stringshare_add(name);
- return acc;
- } /* _my_account_new */
- static void
- _my_account_free(My_Account * acc)
- {
- My_Message * m;
- My_Post * p;
- _eet_string_free(acc->name);
- EINA_LIST_FREE(acc->messages, m)
- _my_message_free(m);
- EINA_LIST_FREE(acc->posts, p)
- _my_post_free(p);
- free(acc);
- } /* _my_account_free */
- static My_Cache *
- _my_cache_new(void)
- {
- My_Cache * my_cache = calloc(1, sizeof(My_Cache));
- if (!my_cache)
- {
- fprintf(stderr, "ERROR: could not calloc My_Cache\n");
- return NULL;
- }
- my_cache->version = 1;
- return my_cache;
- } /* _my_cache_new */
- static void
- _my_cache_free(My_Cache * my_cache)
- {
- My_Account * acc;
- EINA_LIST_FREE(my_cache->accounts, acc)
- _my_account_free(acc);
- free(my_cache);
- } /* _my_cache_free */
- static My_Account *
- _my_cache_account_find(My_Cache * my_cache, const char * name)
- {
- My_Account * acc;
- Eina_List * l;
- EINA_LIST_FOREACH(my_cache->accounts, l, acc)
- if (strcmp(acc->name, name) == 0)
- return acc;
- return NULL;
- } /* _my_cache_account_find */
- static My_Cache *
- _my_cache_load(const char * filename)
- {
- My_Cache * my_cache;
- Eet_File * ef = eet_open(filename, EET_FILE_MODE_READ);
- if (!ef)
- {
- fprintf(stderr, "ERROR: could not open '%s' for read\n", filename);
- return NULL;
- }
- my_cache = eet_data_read(ef, _my_cache_descriptor, MY_CACHE_FILE_ENTRY);
- if (!my_cache)
- {
- eet_close(ef);
- return NULL;
- }
- if (my_cache->version < 1)
- {
- fprintf(stderr,
- "WARNING: version %#x was too old, upgrading it to %#x\n",
- my_cache->version, 1);
- my_cache->version = 1;
- }
- if (_my_cache_file)
- eet_close(_my_cache_file);
- _my_cache_file = ef;
- _my_cache_dict = eet_dictionary_get(ef);
- return my_cache;
- } /* _my_cache_load */
- static Eina_Bool
- _my_cache_save(const My_Cache * my_cache, const char * filename)
- {
- char tmp[PATH_MAX];
- Eet_File * ef;
- Eina_Bool ret;
- unsigned int i, len;
- struct stat st;
- len = eina_strlcpy(tmp, filename, sizeof(tmp));
- if (len + 12 >= (int)sizeof(tmp))
- {
- fprintf(stderr, "ERROR: file name is too big: %s\n", filename);
- return EINA_FALSE;
- }
- i = 0;
- do
- {
- snprintf(tmp + len, 12, ".%u", i);
- i++;
- }
- while (stat(tmp, &st) == 0);
- ef = eet_open(tmp, EET_FILE_MODE_WRITE);
- if (!ef)
- {
- fprintf(stderr, "ERROR: could not open '%s' for write\n", tmp);
- return EINA_FALSE;
- }
- ret = eet_data_write
- (ef, _my_cache_descriptor, MY_CACHE_FILE_ENTRY, my_cache, EINA_TRUE);
- // VERY IMPORTANT NOTE:
- // after eet_close(), all strings mmaped from file will be GONE, invalid!
- // you'll need to free the old cache and open the new one.
- // For cache this is okay, as you should be saving not so often or just
- // at end.
- //
- // This is a trade off, you save memory by using mmap()ed strings, but
- // you have to care about this.
- eet_close(ef);
- if (ret)
- {
- unlink(filename);
- rename(tmp, filename);
- }
- return ret;
- } /* _my_cache_save */
- int main(int argc, char * argv[])
- {
- My_Cache * my_cache;
- const Eina_List * l_acc;
- My_Account * acc;
- int ret = 0;
- if (argc < 3)
- {
- fprintf(stderr,
- "Usage:\n\t%s <input> <output> [action] [action-params]\n\n"
- "Where actions and their parameters:\n"
- "\tacc <name>\n"
- "\tpost <account-name> <message>\n"
- "\tmessage <account-name> <message>\n"
- "\n",
- argv[0]);
- return -1;
- }
- eina_init();
- eet_init();
- _my_cache_descriptor_init();
- my_cache = _my_cache_load(argv[1]);
- if (!my_cache)
- {
- printf("creating new cache.\n");
- my_cache = _my_cache_new();
- if (!my_cache)
- {
- ret = -2;
- goto end;
- }
- }
- if (argc > 3)
- {
- if (strcmp(argv[3], "acc") == 0)
- {
- if (argc == 5)
- {
- My_Account * acc = _my_cache_account_find(my_cache, argv[4]);
- if (!acc)
- {
- acc = _my_account_new(argv[4]);
- my_cache->accounts = eina_list_append
- (my_cache->accounts, acc);
- }
- else
- fprintf(stderr, "ERROR: account '%s' already exists.\n",
- argv[4]);
- }
- else
- fprintf(stderr,
- "ERROR: wrong number of parameters (%d).\n",
- argc);
- }
- else if (strcmp(argv[3], "post") == 0)
- {
- if (argc == 6)
- {
- My_Account * acc = _my_cache_account_find(my_cache, argv[4]);
- if (acc)
- {
- My_Post * post = _my_post_new(argv[5]);
- acc->posts = eina_list_append(acc->posts, post);
- }
- else
- fprintf(stderr, "ERROR: unknown account: '%s'\n", argv[4]);
- }
- else
- fprintf(stderr,
- "ERROR: wrong number of parameters (%d).\n",
- argc);
- }
- else if (strcmp(argv[3], "message") == 0)
- {
- if (argc == 6)
- {
- My_Account * acc = _my_cache_account_find(my_cache, argv[4]);
- if (acc)
- {
- My_Message * msg = _my_message_new(argv[5]);
- acc->messages = eina_list_append(acc->messages, msg);
- }
- else
- fprintf(stderr, "ERROR: unknown account: '%s'\n", argv[4]);
- }
- else
- fprintf(stderr,
- "ERROR: wrong number of parameters (%d).\n",
- argc);
- }
- else
- fprintf(stderr, "ERROR: unknown action '%s'\n", argv[2]);
- }
- printf("My_Cache:\n"
- "\tversion.: %#x\n"
- "\taccounts: %u\n",
- my_cache->version,
- eina_list_count(my_cache->accounts));
- EINA_LIST_FOREACH(my_cache->accounts, l_acc, acc)
- {
- const My_Post * post;
- printf("\t > %-#8x '%.20s' stats: m=%u, p=%u\n",
- acc->id, acc->name ? acc->name : "",
- eina_list_count(acc->messages),
- eina_list_count(acc->posts));
- if (eina_list_count(acc->messages))
- {
- const Eina_List * l;
- const My_Message * msg;
- printf("\t |messages:\n");
- EINA_LIST_FOREACH(acc->messages, l, msg)
- {
- printf("\t | %-8x '%s' [%s]: '%.20s'\n",
- msg->id,
- msg->name ? msg->name : "",
- msg->screen_name ? msg->screen_name : "",
- msg->message ? msg->message : "");
- }
- }
- if (eina_list_count(acc->posts))
- {
- const Eina_List * l;
- const My_Post * post;
- printf("\t |posts:\n");
- EINA_LIST_FOREACH(acc->posts, l, post)
- {
- if (post->dm_to)
- printf("\t | @%s: '%.20s'\n", post->dm_to, post->message);
- else
- printf("\t | '%.20s'\n", post->message);
- }
- }
- printf("\n");
- }
- if (!_my_cache_save(my_cache, argv[2]))
- ret = -3;
- _my_cache_free(my_cache);
- end:
- _my_cache_descriptor_shutdown();
- eet_shutdown();
- eina_shutdown();
- return ret;
- } /* main */