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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.
*/
#include "PeakBuffer.hxx"
#include "DynamicFifoBuffer.hxx"
#include <algorithm>
#include <assert.h>
#include <string.h>
PeakBuffer::~PeakBuffer()
{
delete normal_buffer;
delete peak_buffer;
}
bool
PeakBuffer::IsEmpty() const noexcept
{
return (normal_buffer == nullptr || normal_buffer->IsEmpty()) &&
(peak_buffer == nullptr || peak_buffer->IsEmpty());
}
WritableBuffer<void>
PeakBuffer::Read() const noexcept
{
if (normal_buffer != nullptr) {
const auto p = normal_buffer->Read();
if (!p.IsEmpty())
return p.ToVoid();
}
if (peak_buffer != nullptr) {
const auto p = peak_buffer->Read();
if (!p.IsEmpty())
return p.ToVoid();
}
return nullptr;
}
void
PeakBuffer::Consume(size_t length) noexcept
{
if (normal_buffer != nullptr && !normal_buffer->IsEmpty()) {
normal_buffer->Consume(length);
return;
}
if (peak_buffer != nullptr && !peak_buffer->IsEmpty()) {
peak_buffer->Consume(length);
if (peak_buffer->IsEmpty()) {
delete peak_buffer;
peak_buffer = nullptr;
}
return;
}
}
static size_t
AppendTo(DynamicFifoBuffer<uint8_t> &buffer,
const void *data, size_t length) noexcept
{
assert(data != nullptr);
assert(length > 0);
size_t total = 0;
do {
const auto p = buffer.Write();
if (p.IsEmpty())
break;
const size_t nbytes = std::min(length, p.size);
memcpy(p.data, data, nbytes);
buffer.Append(nbytes);
data = (const uint8_t *)data + nbytes;
length -= nbytes;
total += nbytes;
} while (length > 0);
return total;
}
bool
PeakBuffer::Append(const void *data, size_t length)
{
if (length == 0)
return true;
if (peak_buffer != nullptr && !peak_buffer->IsEmpty()) {
size_t nbytes = AppendTo(*peak_buffer, data, length);
return nbytes == length;
}
if (normal_buffer == nullptr)
normal_buffer = new DynamicFifoBuffer<uint8_t>(normal_size);
size_t nbytes = AppendTo(*normal_buffer, data, length);
if (nbytes > 0) {
data = (const uint8_t *)data + nbytes;
length -= nbytes;
if (length == 0)
return true;
}
if (peak_buffer == nullptr) {
if (peak_size > 0)
peak_buffer = new DynamicFifoBuffer<uint8_t>(peak_size);
if (peak_buffer == nullptr)
return false;
}
nbytes = AppendTo(*peak_buffer, data, length);
return nbytes == length;
}
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