92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
/*
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* Copyright 2003-2017 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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#ifndef MPD_ICY_META_DATA_PARSER_HXX
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#define MPD_ICY_META_DATA_PARSER_HXX
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#include "tag/Tag.hxx"
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#include <memory>
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#include <stddef.h>
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class IcyMetaDataParser {
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size_t data_size = 0, data_rest;
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size_t meta_size, meta_position;
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char *meta_data;
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std::unique_ptr<Tag> tag;
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public:
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~IcyMetaDataParser() noexcept {
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Reset();
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}
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/**
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* Initialize an enabled icy_metadata object with the specified
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* data_size (from the icy-metaint HTTP response header).
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*/
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void Start(size_t _data_size) noexcept {
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data_size = data_rest = _data_size;
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meta_size = 0;
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tag = nullptr;
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}
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/**
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* Resets the icy_metadata. Call this after rewinding the stream.
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*/
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void Reset() noexcept;
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/**
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* Checks whether the icy_metadata object is enabled.
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*/
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bool IsDefined() const noexcept {
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return data_size > 0;
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}
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/**
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* Evaluates data. Returns the number of bytes of normal data which
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* can be read by the caller, but not more than "length". If the
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* return value is smaller than "length", the caller should invoke
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* icy_meta().
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*/
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size_t Data(size_t length) noexcept;
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/**
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* Reads metadata from the stream. Returns the number of bytes
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* consumed. If the return value is smaller than "length", the caller
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* should invoke icy_data().
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*/
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size_t Meta(const void *data, size_t length) noexcept;
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/**
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* Parse data and eliminate metadata.
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*
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* @return the number of data bytes remaining in the buffer
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*/
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size_t ParseInPlace(void *data, size_t length) noexcept;
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std::unique_ptr<Tag> ReadTag() noexcept {
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return std::exchange(tag, nullptr);
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}
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};
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#endif
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