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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.
*/
#ifndef MPD_BUFFERED_READER_HXX
#define MPD_BUFFERED_READER_HXX
#include "check.h"
#include "Compiler.h"
#include "util/DynamicFifoBuffer.hxx"
#include <stddef.h>
class Reader;
class BufferedReader {
static constexpr size_t MAX_SIZE = 512 * 1024;
Reader &reader;
DynamicFifoBuffer<char> buffer;
bool eof;
unsigned line_number;
public:
BufferedReader(Reader &_reader)
:reader(_reader), buffer(4096), eof(false),
line_number(0) {}
/**
* Reset the internal state. Should be called after rewinding
* the underlying #Reader.
*/
void Reset() {
buffer.Clear();
eof = false;
line_number = 0;
}
bool Fill(bool need_more);
gcc_pure
WritableBuffer<void> Read() const {
return buffer.Read().ToVoid();
}
/**
* Read a buffer of exactly the given size (without consuming
* it). Throws std::runtime_error if not enough data is
* available.
*/
gcc_pure
void *ReadFull(size_t size);
void Consume(size_t n) {
buffer.Consume(n);
}
/**
* Read (and consume) data from the input buffer into the
* given buffer. Does not attempt to refill the buffer.
*/
size_t ReadFromBuffer(WritableBuffer<void> dest);
/**
* Read data into the given buffer and consume it from our
* buffer. Throw an exception if the request cannot be
* forfilled.
*/
void ReadFull(WritableBuffer<void> dest);
char *ReadLine();
unsigned GetLineNumber() const {
return line_number;
}
};
#endif
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