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c32f7c7f86
hasiXMLData() / hasBEXTData() were implemented as !data.isEmpty()
checks, which conflated in-memory payload with on-disk block presence.
That caused two wrong answers:
* setiXMLData("foo") on a file with no iXML block made hasiXMLData()
return true immediately, before save().
* A FLAC file carrying an iXML APPLICATION block with empty payload
round-tripped fine, but hasiXMLData() reported false.
Switch to the same model RIFF::WAV::File already uses: explicit
hasiXML / hasBEXT bool flags on FilePrivate, set during scan() when
the APPLICATION block is recognised, updated during save() after the
block is (re)written or omitted, and returned verbatim by the
accessors. New regression test pins down the before/after-save and
empty-block cases.
Refs: https://github.com/taglib/taglib/issues/1362
TagLib
TagLib Audio Metadata Library
TagLib is a library for reading and editing the metadata of several popular audio formats. Currently, it supports various metadata containers such as ID3v1, ID3v2 and Vorbis comments for MP3, MP4, AAC, Ogg, Opus, FLAC, Speex, APE, MPC, WavPack, WAV, AIFF, TrueAudio, Matroska, WebM, ASF, WMA, DSF, DFF and tracker (MOD, XM, S3M, IT) files.
TagLib is distributed under the GNU Lesser General Public License (LGPL) and Mozilla Public License (MPL). Essentially that means that it may be used in proprietary applications, but if changes are made to TagLib they must be contributed back to the project. Please review the licenses if you are considering using TagLib in your project.