tor-browser

dict.h (9521B)

---

/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/

/**
* @file
* Public dictionary API.
* @deprecated
*  AVDictionary is provided for compatibility with libav. It is both in
*  implementation as well as API inefficient. It does not scale and is
*  extremely slow with large dictionaries.
*  It is recommended that new code uses our tree container from tree.c/h
*  where applicable, which uses AVL trees to achieve O(log n) performance.
*/

#ifndef AVUTIL_DICT_H
#define AVUTIL_DICT_H

#include <stdint.h>

/**
* @addtogroup lavu_dict AVDictionary
* @ingroup lavu_data
*
* @brief Simple key:value store
*
* @{
* Dictionaries are used for storing key-value pairs.
*
* - To **create an AVDictionary**, simply pass an address of a NULL
*   pointer to av_dict_set(). NULL can be used as an empty dictionary
*   wherever a pointer to an AVDictionary is required.
* - To **insert an entry**, use av_dict_set().
* - Use av_dict_get() to **retrieve an entry**.
* - To **iterate over all entries**, use av_dict_iterate().
* - In order to **free the dictionary and all its contents**, use av_dict_free().
*
@code
  AVDictionary *d = NULL;           // "create" an empty dictionary
  AVDictionaryEntry *t = NULL;

  av_dict_set(&d, "foo", "bar", 0); // add an entry

  char *k = av_strdup("key");       // if your strings are already allocated,
  char *v = av_strdup("value");     // you can avoid copying them like this
  av_dict_set(&d, k, v, AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL);

  while ((t = av_dict_iterate(d, t))) {
      <....>                        // iterate over all entries in d
  }
  av_dict_free(&d);
@endcode
*/

/**
* @name AVDictionary Flags
* Flags that influence behavior of the matching of keys or insertion to the dictionary.
* @{
*/
#define AV_DICT_MATCH_CASE      1   /**< Only get an entry with exact-case key match. Only relevant in av_dict_get(). */
#define AV_DICT_IGNORE_SUFFIX   2   /**< Return first entry in a dictionary whose first part corresponds to the search key,
                                        ignoring the suffix of the found key string. Only relevant in av_dict_get(). */
#define AV_DICT_DONT_STRDUP_KEY 4   /**< Take ownership of a key that's been
                                        allocated with av_malloc() or another memory allocation function. */
#define AV_DICT_DONT_STRDUP_VAL 8   /**< Take ownership of a value that's been
                                        allocated with av_malloc() or another memory allocation function. */
#define AV_DICT_DONT_OVERWRITE 16   /**< Don't overwrite existing entries. */
#define AV_DICT_APPEND         32   /**< If the entry already exists, append to it.  Note that no
                                        delimiter is added, the strings are simply concatenated. */
#define AV_DICT_MULTIKEY       64   /**< Allow to store several equal keys in the dictionary */
#define AV_DICT_DEDUP         128   /**< If inserting a value that already exists for a key, do nothing. Only relevant with AV_DICT_MULTIKEY. */
/**
* @}
*/

typedef struct AVDictionaryEntry {
   char *key;
   char *value;
} AVDictionaryEntry;

typedef struct AVDictionary AVDictionary;

/**
* Get a dictionary entry with matching key.
*
* The returned entry key or value must not be changed, or it will
* cause undefined behavior.
*
* @param prev  Set to the previous matching element to find the next.
*              If set to NULL the first matching element is returned.
* @param key   Matching key
* @param flags A collection of AV_DICT_* flags controlling how the
*              entry is retrieved
*
* @return      Found entry or NULL in case no matching entry was found in the dictionary
*/
AVDictionaryEntry *av_dict_get(const AVDictionary *m, const char *key,
                              const AVDictionaryEntry *prev, int flags);

/**
* Iterate over a dictionary
*
* Iterates through all entries in the dictionary.
*
* @warning The returned AVDictionaryEntry key/value must not be changed.
*
* @warning As av_dict_set() invalidates all previous entries returned
* by this function, it must not be called while iterating over the dict.
*
* Typical usage:
* @code
* const AVDictionaryEntry *e = NULL;
* while ((e = av_dict_iterate(m, e))) {
*     // ...
* }
* @endcode
*
* @param m     The dictionary to iterate over
* @param prev  Pointer to the previous AVDictionaryEntry, NULL initially
*
* @retval AVDictionaryEntry* The next element in the dictionary
* @retval NULL               No more elements in the dictionary
*/
const AVDictionaryEntry *av_dict_iterate(const AVDictionary *m,
                                        const AVDictionaryEntry *prev);

/**
* Get number of entries in dictionary.
*
* @param m dictionary
* @return  number of entries in dictionary
*/
int av_dict_count(const AVDictionary *m);

/**
* Set the given entry in *pm, overwriting an existing entry.
*
* Note: If AV_DICT_DONT_STRDUP_KEY or AV_DICT_DONT_STRDUP_VAL is set,
* these arguments will be freed on error.
*
* @warning Adding a new entry to a dictionary invalidates all existing entries
* previously returned with av_dict_get() or av_dict_iterate().
*
* @param pm        Pointer to a pointer to a dictionary struct. If *pm is NULL
*                  a dictionary struct is allocated and put in *pm.
* @param key       Entry key to add to *pm (will either be av_strduped or added as a new key depending on flags)
* @param value     Entry value to add to *pm (will be av_strduped or added as a new key depending on flags).
*                  Passing a NULL value will cause an existing entry to be deleted.
*
* @return          >= 0 on success otherwise an error code <0
*/
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags);

/**
* Convenience wrapper for av_dict_set() that converts the value to a string
* and stores it.
*
* Note: If ::AV_DICT_DONT_STRDUP_KEY is set, key will be freed on error.
*/
int av_dict_set_int(AVDictionary **pm, const char *key, int64_t value, int flags);

/**
* Parse the key/value pairs list and add the parsed entries to a dictionary.
*
* In case of failure, all the successfully set entries are stored in
* *pm. You may need to manually free the created dictionary.
*
* @param key_val_sep  A 0-terminated list of characters used to separate
*                     key from value
* @param pairs_sep    A 0-terminated list of characters used to separate
*                     two pairs from each other
* @param flags        Flags to use when adding to the dictionary.
*                     ::AV_DICT_DONT_STRDUP_KEY and ::AV_DICT_DONT_STRDUP_VAL
*                     are ignored since the key/value tokens will always
*                     be duplicated.
*
* @return             0 on success, negative AVERROR code on failure
*/
int av_dict_parse_string(AVDictionary **pm, const char *str,
                        const char *key_val_sep, const char *pairs_sep,
                        int flags);

/**
* Copy entries from one AVDictionary struct into another.
*
* @note Metadata is read using the ::AV_DICT_IGNORE_SUFFIX flag
*
* @param dst   Pointer to a pointer to a AVDictionary struct to copy into. If *dst is NULL,
*              this function will allocate a struct for you and put it in *dst
* @param src   Pointer to the source AVDictionary struct to copy items from.
* @param flags Flags to use when setting entries in *dst
*
* @return 0 on success, negative AVERROR code on failure. If dst was allocated
*           by this function, callers should free the associated memory.
*/
int av_dict_copy(AVDictionary **dst, const AVDictionary *src, int flags);

/**
* Free all the memory allocated for an AVDictionary struct
* and all keys and values.
*/
void av_dict_free(AVDictionary **m);

/**
* Get dictionary entries as a string.
*
* Create a string containing dictionary's entries.
* Such string may be passed back to av_dict_parse_string().
* @note String is escaped with backslashes ('\').
*
* @warning Separators cannot be neither '\\' nor '\0'. They also cannot be the same.
*
* @param[in]  m             The dictionary
* @param[out] buffer        Pointer to buffer that will be allocated with string containing entries.
*                           Buffer must be freed by the caller when is no longer needed.
* @param[in]  key_val_sep   Character used to separate key from value
* @param[in]  pairs_sep     Character used to separate two pairs from each other
*
* @return                   >= 0 on success, negative on error
*/
int av_dict_get_string(const AVDictionary *m, char **buffer,
                      const char key_val_sep, const char pairs_sep);

/**
* @}
*/

#endif /* AVUTIL_DICT_H */