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/*
* Copyright (C) 2003-2014 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 "DecoderBuffer.hxx"
#include "DecoderAPI.hxx"
#include "util/ConstBuffer.hxx"
#include "util/DynamicFifoBuffer.hxx"
#include <assert.h>
struct DecoderBuffer {
Decoder *decoder;
InputStream *is;
DynamicFifoBuffer<uint8_t> buffer;
DecoderBuffer(Decoder *_decoder, InputStream &_is,
size_t _size)
:decoder(_decoder), is(&_is), buffer(_size) {}
};
DecoderBuffer *
decoder_buffer_new(Decoder *decoder, InputStream &is,
size_t size)
{
assert(size > 0);
return new DecoderBuffer(decoder, is, size);
}
void
decoder_buffer_free(DecoderBuffer *buffer)
{
assert(buffer != nullptr);
delete buffer;
}
const InputStream &
decoder_buffer_get_stream(const DecoderBuffer *buffer)
{
return *buffer->is;
}
void
decoder_buffer_clear(DecoderBuffer *buffer)
{
buffer->buffer.Clear();
}
bool
decoder_buffer_fill(DecoderBuffer *buffer)
{
auto w = buffer->buffer.Write();
if (w.IsEmpty())
/* buffer is full */
return false;
size_t nbytes = decoder_read(buffer->decoder, *buffer->is,
w.data, w.size);
if (nbytes == 0)
/* end of file, I/O error or decoder command
received */
return false;
buffer->buffer.Append(nbytes);
return true;
}
size_t
decoder_buffer_available(const DecoderBuffer *buffer)
{
return buffer->buffer.GetAvailable();
}
ConstBuffer<void>
decoder_buffer_read(const DecoderBuffer *buffer)
{
auto r = buffer->buffer.Read();
return { r.data, r.size };
}
ConstBuffer<void>
decoder_buffer_need(DecoderBuffer *buffer, size_t min_size)
{
while (true) {
const auto r = decoder_buffer_read(buffer);
if (r.size >= min_size)
return r;
if (!decoder_buffer_fill(buffer))
return nullptr;
}
}
void
decoder_buffer_consume(DecoderBuffer *buffer, size_t nbytes)
{
buffer->buffer.Consume(nbytes);
}
bool
decoder_buffer_skip(DecoderBuffer *buffer, size_t nbytes)
{
const auto r = buffer->buffer.Read();
if (r.size >= nbytes) {
buffer->buffer.Consume(nbytes);
return true;
}
buffer->buffer.Clear();
nbytes -= r.size;
return decoder_skip(buffer->decoder, *buffer->is, nbytes);
}
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