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/*
* Copyright (C) 2003-2015 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"
#include "IcyInputStream.hxx"
#include "tag/Tag.hxx"
IcyInputStream::IcyInputStream(InputStream *_input)
:ProxyInputStream(_input),
input_tag(nullptr), icy_tag(nullptr),
override_offset(0)
{
}
IcyInputStream::~IcyInputStream()
{
delete input_tag;
delete icy_tag;
}
void
IcyInputStream::Update()
{
ProxyInputStream::Update();
if (IsEnabled())
offset = override_offset;
}
Tag *
IcyInputStream::ReadTag()
{
Tag *new_input_tag = ProxyInputStream::ReadTag();
if (!IsEnabled())
return new_input_tag;
if (new_input_tag != nullptr) {
delete input_tag;
input_tag = new_input_tag;
}
Tag *new_icy_tag = parser.ReadTag();
if (new_icy_tag != nullptr) {
delete icy_tag;
icy_tag = new_icy_tag;
}
if (new_input_tag == nullptr && new_icy_tag == nullptr)
/* no change */
return nullptr;
if (input_tag == nullptr && icy_tag == nullptr)
/* no tag */
return nullptr;
if (input_tag == nullptr)
return new Tag(*icy_tag);
if (icy_tag == nullptr)
return new Tag(*input_tag);
return Tag::Merge(*input_tag, *icy_tag);
}
size_t
IcyInputStream::Read(void *ptr, size_t read_size, Error &error)
{
if (!IsEnabled())
return ProxyInputStream::Read(ptr, read_size, error);
while (true) {
size_t nbytes = ProxyInputStream::Read(ptr, read_size, error);
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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