117 lines
3.0 KiB
C++
117 lines
3.0 KiB
C++
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/*
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* Copyright (C) 2003-2014 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "Set.hxx"
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#include "TagBuilder.hxx"
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#include <assert.h>
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/**
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* Copy all tag items of the specified type.
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*/
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static bool
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CopyTagItem(TagBuilder &dest, TagType dest_type,
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const Tag &src, TagType src_type)
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{
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bool found = false;
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const unsigned n = src.num_items;
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for (unsigned i = 0; i < n; ++i) {
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if (src.items[i]->type == src_type) {
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dest.AddItem(dest_type, src.items[i]->value);
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found = true;
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}
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}
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return found;
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}
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/**
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* Copy all tag items of the specified type. Fall back to "Artist" if
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* there is no "AlbumArtist".
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*/
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static void
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CopyTagItem(TagBuilder &dest, const Tag &src, TagType type)
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{
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if (!CopyTagItem(dest, type, src, type) &&
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type == TAG_ALBUM_ARTIST)
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CopyTagItem(dest, type, src, TAG_ARTIST);
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}
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/**
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* Copy all tag items of the types in the mask.
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*/
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static void
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CopyTagMask(TagBuilder &dest, const Tag &src, uint32_t mask)
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{
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for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
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if ((mask & (1u << i)) != 0)
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CopyTagItem(dest, src, TagType(i));
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}
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void
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TagSet::InsertUnique(const Tag &src, TagType type, const char *value,
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uint32_t group_mask)
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{
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TagBuilder builder;
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if (value == nullptr)
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builder.AddEmptyItem(type);
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else
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builder.AddItem(type, value);
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CopyTagMask(builder, src, group_mask);
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#if defined(__clang__) || GCC_CHECK_VERSION(4,8)
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emplace(builder.Commit());
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#else
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insert(builder.Commit());
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#endif
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}
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bool
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TagSet::CheckUnique(TagType dest_type,
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const Tag &tag, TagType src_type,
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uint32_t group_mask)
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{
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bool found = false;
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for (unsigned i = 0; i < tag.num_items; ++i) {
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if (tag.items[i]->type == src_type) {
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InsertUnique(tag, dest_type,
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tag.items[i]->value,
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group_mask);
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found = true;
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}
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}
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return found;
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}
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void
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TagSet::InsertUnique(const Tag &tag,
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TagType type, uint32_t group_mask)
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{
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static_assert(sizeof(group_mask) * 8 >= TAG_NUM_OF_ITEM_TYPES,
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"Mask is too small");
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assert((group_mask & (1u << unsigned(type))) == 0);
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if (!CheckUnique(type, tag, type, group_mask) &&
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(type != TAG_ALBUM_ARTIST ||
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/* fall back to "Artist" if no "AlbumArtist" was found */
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!CheckUnique(type, tag, TAG_ARTIST, group_mask)))
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InsertUnique(tag, type, nullptr, group_mask);
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}
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