mpd/src/SongFilter.cxx

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/*
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* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
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#include "SongFilter.hxx"
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#include "db/LightSong.hxx"
#include "DetachedSong.hxx"
#include "tag/ParseName.hxx"
#include "util/ConstBuffer.hxx"
#include "util/StringAPI.hxx"
#include "util/ASCII.hxx"
#include "util/TimeParser.hxx"
#include "util/UriUtil.hxx"
#include "lib/icu/Collate.hxx"
#include <stdexcept>
#include <assert.h>
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#include <stdlib.h>
#define LOCATE_TAG_FILE_KEY "file"
#define LOCATE_TAG_FILE_KEY_OLD "filename"
#define LOCATE_TAG_ANY_KEY "any"
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unsigned
locate_parse_type(const char *str) noexcept
{
if (StringEqualsCaseASCII(str, LOCATE_TAG_FILE_KEY) ||
StringEqualsCaseASCII(str, LOCATE_TAG_FILE_KEY_OLD))
return LOCATE_TAG_FILE_TYPE;
if (StringEqualsCaseASCII(str, LOCATE_TAG_ANY_KEY))
return LOCATE_TAG_ANY_TYPE;
if (strcmp(str, "base") == 0)
return LOCATE_TAG_BASE_TYPE;
if (strcmp(str, "modified-since") == 0)
return LOCATE_TAG_MODIFIED_SINCE;
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return tag_name_parse_i(str);
}
static AllocatedString<>
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ImportString(const char *p, bool fold_case)
{
return fold_case
? IcuCaseFold(p)
: AllocatedString<>::Duplicate(p);
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}
SongFilter::Item::Item(unsigned _tag, const char *_value, bool _fold_case)
:tag(_tag), fold_case(_fold_case),
value(ImportString(_value, _fold_case))
{
}
SongFilter::Item::Item(unsigned _tag, time_t _time)
:tag(_tag), value(nullptr), time(_time)
{
}
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bool
SongFilter::Item::StringMatch(const char *s) const noexcept
{
#if !CLANG_CHECK_VERSION(3,6)
/* disabled on clang due to -Wtautological-pointer-compare */
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assert(s != nullptr);
#endif
Merge branches/ew r7104 thread-safety work in preparation for rewrite to use pthreads Expect no regressions against trunk (r7078), possibly minor performance improvements in update (due to fewer heap allocations), but increased stack usage. Applied the following patches: * maxpath_str for reentrancy (temporary fix, reverted) * path: start working on thread-safe variants of these methods * Re-entrancy work on path/character-set conversions * directory.c: exploreDirectory() use reentrant functions here * directory/update: more use of reentrant functions + cleanups * string_toupper: a strdup-less version of strDupToUpper * get_song_url: a static-variable-free version of getSongUrl() * Use reentrant/thread-safe get_song_url everywhere * replace rmp2amp with the reentrant version, rmp2amp_r * Get rid of the non-reentrant/non-thread-safe rpp2app, too. * buffer2array: assert strdup() returns a usable value in unit tests * replace utf8ToFsCharset and fsCharsetToUtf8 with thread-safe variants * fix storing playlists w/o absolute paths * parent_path(), a reentrant version of parentPath() * parentPath => parent_path for reentrancy and thread-safety * allow "make test" to automatically run embedded unit tests * remove convStrDup() and maxpath_str() * use MPD_PATH_MAX everywhere instead of MAXPATHLEN * path: get rid of appendSlash, pfx_path and just use pfx_dir * get_song_url: fix the ability to play songs in the top-level music_directory git-svn-id: https://svn.musicpd.org/mpd/trunk@7106 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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assert(tag != LOCATE_TAG_MODIFIED_SINCE);
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if (fold_case) {
const auto folded = IcuCaseFold(s);
assert(!folded.IsNull());
return StringFind(folded.c_str(), value.c_str()) != nullptr;
} else {
return StringIsEqual(s, value.c_str());
}
}
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bool
SongFilter::Item::Match(const TagItem &item) const noexcept
{
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return (tag == LOCATE_TAG_ANY_TYPE || (unsigned)item.type == tag) &&
StringMatch(item.value);
}
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bool
SongFilter::Item::Match(const Tag &_tag) const noexcept
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{
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bool visited_types[TAG_NUM_OF_ITEM_TYPES];
std::fill_n(visited_types, size_t(TAG_NUM_OF_ITEM_TYPES), false);
for (const auto &i : _tag) {
visited_types[i.type] = true;
if (Match(i))
return true;
}
if (tag < TAG_NUM_OF_ITEM_TYPES && !visited_types[tag]) {
/* If the search critieron was not visited during the
sweep through the song's tag, it means this field
is absent from the tag or empty. Thus, if the
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searched string is also empty
then it's a match as well and we should return
true. */
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if (value.empty())
return true;
if (tag == TAG_ALBUM_ARTIST && visited_types[TAG_ARTIST]) {
/* if we're looking for "album artist", but
only "artist" exists, use that */
for (const auto &item : _tag)
if (item.type == TAG_ARTIST &&
StringMatch(item.value))
return true;
}
}
return false;
}
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bool
SongFilter::Item::Match(const DetachedSong &song) const noexcept
{
if (tag == LOCATE_TAG_BASE_TYPE)
return uri_is_child_or_same(value.c_str(), song.GetURI());
if (tag == LOCATE_TAG_MODIFIED_SINCE)
return song.GetLastModified() >= std::chrono::system_clock::from_time_t(time);
if (tag == LOCATE_TAG_FILE_TYPE)
return StringMatch(song.GetURI());
return Match(song.GetTag());
}
bool
SongFilter::Item::Match(const LightSong &song) const noexcept
{
if (tag == LOCATE_TAG_BASE_TYPE) {
const auto uri = song.GetURI();
return uri_is_child_or_same(value.c_str(), uri.c_str());
}
if (tag == LOCATE_TAG_MODIFIED_SINCE)
return song.mtime >= std::chrono::system_clock::from_time_t(time);
if (tag == LOCATE_TAG_FILE_TYPE) {
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const auto uri = song.GetURI();
return StringMatch(uri.c_str());
}
return Match(*song.tag);
}
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SongFilter::SongFilter(unsigned tag, const char *value, bool fold_case)
{
items.push_back(Item(tag, value, fold_case));
}
SongFilter::~SongFilter()
{
/* this destructor exists here just so it won't get inlined */
}
gcc_pure
static time_t
ParseTimeStamp(const char *s) noexcept
{
assert(s != nullptr);
char *endptr;
unsigned long long value = strtoull(s, &endptr, 10);
if (*endptr == 0 && endptr > s)
/* it's an integral UNIX time stamp */
return (time_t)value;
try {
/* try ISO 8601 */
const auto t = ParseTimePoint(s, "%FT%TZ");
return std::chrono::system_clock::to_time_t(t);
} catch (const std::runtime_error &) {
return 0;
}
}
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bool
SongFilter::Parse(const char *tag_string, const char *value, bool fold_case)
{
unsigned tag = locate_parse_type(tag_string);
if (tag == TAG_NUM_OF_ITEM_TYPES)
return false;
if (tag == LOCATE_TAG_BASE_TYPE) {
if (!uri_safe_local(value))
return false;
/* case folding doesn't work with "base" */
fold_case = false;
}
if (tag == LOCATE_TAG_MODIFIED_SINCE) {
time_t t = ParseTimeStamp(value);
if (t == 0)
return false;
items.push_back(Item(tag, t));
return true;
}
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items.push_back(Item(tag, value, fold_case));
return true;
}
bool
SongFilter::Parse(ConstBuffer<const char *> args, bool fold_case)
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{
if (args.size == 0 || args.size % 2 != 0)
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return false;
for (unsigned i = 0; i < args.size; i += 2)
if (!Parse(args[i], args[i + 1], fold_case))
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return false;
return true;
}
bool
SongFilter::Match(const DetachedSong &song) const noexcept
{
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for (const auto &i : items)
if (!i.Match(song))
return false;
return true;
}
bool
SongFilter::Match(const LightSong &song) const noexcept
{
for (const auto &i : items)
if (!i.Match(song))
return false;
return true;
}
bool
SongFilter::HasOtherThanBase() const noexcept
{
for (const auto &i : items)
if (i.GetTag() != LOCATE_TAG_BASE_TYPE)
return true;
return false;
}
const char *
SongFilter::GetBase() const noexcept
{
for (const auto &i : items)
if (i.GetTag() == LOCATE_TAG_BASE_TYPE)
return i.GetValue();
return nullptr;
}