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/*
* Copyright 2003-2018 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 "IcyInputStream.hxx"
#include "IcyMetaDataParser.hxx"
#include "tag/Tag.hxx"
IcyInputStream::IcyInputStream(InputStreamPtr _input,
std::shared_ptr<IcyMetaDataParser> _parser) noexcept
:ProxyInputStream(std::move(_input)), parser(std::move(_parser))
{
}
IcyInputStream::~IcyInputStream() noexcept = default;
inline bool
IcyInputStream::IsEnabled() const noexcept
{
assert(parser);
return parser->IsDefined();
}
void
IcyInputStream::Update() noexcept
{
ProxyInputStream::Update();
if (IsEnabled())
offset = override_offset;
}
std::unique_ptr<Tag>
IcyInputStream::ReadTag()
{
auto new_input_tag = ProxyInputStream::ReadTag();
if (!IsEnabled())
return new_input_tag;
const bool had_new_input_tag = !!new_input_tag;
if (new_input_tag != nullptr)
input_tag = std::move(new_input_tag);
auto new_icy_tag = parser->ReadTag();
const bool had_new_icy_tag = !!new_icy_tag;
if (new_icy_tag != nullptr)
icy_tag = std::move(new_icy_tag);
if (!had_new_input_tag && !had_new_icy_tag)
/* no change */
return nullptr;
if (input_tag == nullptr && icy_tag == nullptr)
/* no tag */
return nullptr;
if (input_tag == nullptr)
return std::make_unique<Tag>(*icy_tag);
if (icy_tag == nullptr)
return std::make_unique<Tag>(*input_tag);
return Tag::Merge(*input_tag, *icy_tag);
}
size_t
IcyInputStream::Read(void *ptr, size_t read_size)
{
if (!IsEnabled())
return ProxyInputStream::Read(ptr, read_size);
while (true) {
size_t nbytes = ProxyInputStream::Read(ptr, read_size);
if (nbytes == 0)
return 0;
size_t result = parser->ParseInPlace(ptr, nbytes);
if (result > 0) {
override_offset += result;
offset = override_offset;
return result;
}
}
}
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