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add more convenience for manipulating vorbis comments

This commit is contained in:
Josh Coalson 2002-10-26 04:34:16 +00:00
parent 725829176f
commit 45bb9887e1
2 changed files with 149 additions and 2 deletions
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67
include/FLAC/metadata.h
View File

@ -903,7 +903,9 @@ FLAC_API FLAC__bool FLAC__metadata_iterator_insert_block_after(FLAC__Metadata_It
/** Create a new metadata object instance of the given type.
*
* The object will be "empty"; i.e. values and data pointers will be \c 0.
* The object will be "empty"; i.e. values and data pointers will be \c 0,
* with the exception of FLAC__METADATA_TYPE_VORBIS_COMMENT, which will have
* the vendor string set (but zero comments).
*
* \param type Type of object to create
* \retval FLAC__StreamMetadata*
@ -1229,6 +1231,69 @@ FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_insert_comment(FLAC__Str
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__StreamMetadata *object, unsigned comment_num);
/*@@@@ needs unit test still */
/** Check if the given Vorbis comment entry's field name matches the given
* field name.
*
* \param entry A pointer to an existing Vorbis comment entry.
* \param field_name The field name to check.
* \param field_name_length The length of \a field_name, not including the
* terminating \c NULL.
* \assert
* \code entry != NULL \endcode
* \code (entry->entry != NULL && entry->length > 0)
* \retval FLAC__bool
* \c true if the field names match, else \c false
*/
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, unsigned field_name_length);
/*@@@@ needs unit test still */
/** Find a Vorbis comment with the given field name.
*
* The search begins at entry number \a offset; use and offset of 0 to
* search from the beginning of the comment array.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param offset The offset into the comment array from where to start
* the search.
* \param field_name The field name of the comment to find.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \retval int
* The offset in the comment array of the first comment whose field
* name matches \a field_name, or \c -1 if no match was found.
*/
FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(FLAC__StreamMetadata *object, unsigned offset, const char *field_name);
/*@@@@ needs unit test still */
/** Remove first Vorbis comment matching the given field name.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param field_name The field name of comment to delete.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \retval int
* \c -1 for memory allocation error, \c 0 for no matching entries,
* \c 1 for one matching entry deleted.
*/
FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name);
/*@@@@ needs unit test still */
/** Remove all Vorbis comments matching the given field name.
*
* \param object A pointer to an existing VORBIS_COMMENT object.
* \param field_name The field name of comments to delete.
* \assert
* \code object != NULL \endcode
* \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
* \retval int
* \c -1 for memory allocation error, \c 0 for no matching entries,
* else the number of matching entries deleted.
*/
FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name);
/* \} */
#ifdef __cplusplus

84
src/libFLAC/metadata_object.c
View File

@ -213,7 +213,18 @@ FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_new(FLAC__MetadataType type
case FLAC__METADATA_TYPE_SEEKTABLE:
break;
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
object->length = (FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN + FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN) / 8;
{
object->data.vorbis_comment.vendor_string.length = (unsigned)strlen(FLAC__VENDOR_STRING);
if(!copy_bytes_(&object->data.vorbis_comment.vendor_string.entry, (const FLAC__byte*)FLAC__VENDOR_STRING, object->data.vorbis_comment.vendor_string.length)) {
free(object);
return 0;
}
object->length =
(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8) +
object->data.vorbis_comment.vendor_string.length +
(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN/8)
;
}
break;
default:
/* double protection: */
@ -257,6 +268,8 @@ FLAC_API FLAC__StreamMetadata *FLAC__metadata_object_clone(const FLAC__StreamMet
}
break;
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
if(0 != to->data.vorbis_comment.vendor_string.entry)
free(to->data.vorbis_comment.vendor_string.entry);
if(!copy_vcentry_(&to->data.vorbis_comment.vendor_string, &object->data.vorbis_comment.vendor_string)) {
FLAC__metadata_object_delete(to);
return 0;
@ -751,3 +764,72 @@ FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_delete_comment(FLAC__Str
return FLAC__metadata_object_vorbiscomment_resize_comments(object, vc->num_comments-1);
}
FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC__StreamMetadata_VorbisComment_Entry *entry, const char *field_name, unsigned field_name_length)
{
const FLAC__byte *eq = memchr(entry->entry, '=', entry->length);
#if defined _MSC_VER || defined __MINGW32__
#define FLAC__STRNCASECMP strnicmp
#else
#define FLAC__STRNCASECMP strncasecmp
#endif
return (0 != eq && (unsigned)(eq-entry->entry) == field_name_length && 0 == FLAC__STRNCASECMP(field_name, entry->entry, field_name_length));
#undef FLAC__STRNCASECMP
}
FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
{
const unsigned field_name_length = strlen(field_name);
unsigned i;
FLAC__ASSERT(0 != object);
FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
for(i = offset; i < object->data.vorbis_comment.num_comments; i++) {
if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length))
return (int)i;
}
return -1;
}
FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entry_matching(FLAC__StreamMetadata *object, const char *field_name)
{
const unsigned field_name_length = strlen(field_name);
unsigned i;
FLAC__ASSERT(0 != object);
FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
for(i = 0; i < object->data.vorbis_comment.num_comments; i++) {
if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length)) {
if(!FLAC__metadata_object_vorbiscomment_delete_comment(object, i))
return -1;
else
return 1;
}
}
return 0;
}
FLAC_API int FLAC__metadata_object_vorbiscomment_remove_entries_matching(FLAC__StreamMetadata *object, const char *field_name)
{
FLAC__bool ok = true;
unsigned matching = 0;
const unsigned field_name_length = strlen(field_name);
int i;
FLAC__ASSERT(0 != object);
FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
/* must delete from end to start otherwise it will interfere with our iteration */
for(i = (int)object->data.vorbis_comment.num_comments - 1; ok && i >= 0; i--) {
if(FLAC__metadata_object_vorbiscomment_entry_matches(object->data.vorbis_comment.comments + i, field_name, field_name_length)) {
matching++;
ok &= FLAC__metadata_object_vorbiscomment_delete_comment(object, (unsigned)i);
}
}
return ok? (int)matching : -1;
}