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tag/ApeTag: use IterableSplitString 

Eliminates yet another string copy.
This commit is contained in:
Max Kellermann 2019-06-06 13:32:39 +02:00
parent 8a136b79e5
commit 5675431eaf
2 changed files with 7 additions and 41 deletions
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46
src/tag/ApeTag.cxx
View File

@ -1,5 +1,5 @@
/*
* Copyright 2003-2018 The Music Player Daemon Project
* Copyright 2003-2019 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
@ -23,10 +23,7 @@
#include "Table.hxx"
#include "Handler.hxx"
#include "util/StringView.hxx"
#include <string>
#include <string.h>
#include "util/IterableSplitString.hxx"
static constexpr struct tag_table ape_tags[] = {
{ "album artist", TAG_ALBUM_ARTIST },
@ -44,32 +41,6 @@ tag_ape_name_parse(const char *name)
return type;
}
/**
* Invoke the given callback for each string inside the given range.
* The strings are separated by null bytes, but the last one may not
* be terminated.
*/
template<typename C>
static void
ForEachValue(const char *value, const char *end, C &&callback)
{
while (true) {
const char *n = (const char *)memchr(value, 0, end - value);
if (n == nullptr)
break;
if (n > value)
callback(value);
value = n + 1;
}
if (value < end) {
const std::string value2(value, end);
callback(value2.c_str());
}
}
/**
* @return true if the item was recognized
*/
@ -82,21 +53,16 @@ tag_ape_import_item(unsigned long flags,
if ((flags & (0x3 << 1)) != 0)
return false;
const auto begin = value.begin();
const auto end = value.end();
if (handler.WantPair())
ForEachValue(begin, end, [&handler, key](const char *_value) {
handler.OnPair(key, _value);
});
for (const auto &i : IterableSplitString(value, '\0'))
handler.OnPair(key, i);
TagType type = tag_ape_name_parse(key);
if (type == TAG_NUM_OF_ITEM_TYPES)
return false;
ForEachValue(begin, end, [&handler, type](const char *_value) {
handler.OnTag(type, _value);
});
for (const auto &i : IterableSplitString(value, '\0'))
handler.OnTag(type, i);
return true;
}

2
src/tag/ApeTag.hxx
View File

@ -1,5 +1,5 @@
/*
* Copyright 2003-2018 The Music Player Daemon Project
* Copyright 2003-2019 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify