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/*
* Copyright 2003-2020 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 "Id3Picture.hxx"
#include "Handler.hxx"
#include "util/ByteOrder.hxx"
#include "util/ConstBuffer.hxx"
#include "util/StringView.hxx"
#include <cstdint>
#include <string>
static StringView
ReadString(ConstBuffer<uint8_t> &src) noexcept
{
if (src.size < 4)
return nullptr;
const size_t length = FromBE32(*(const uint32_t *)src.data);
src.skip_front(4);
if (src.size < length)
return nullptr;
StringView result((const char *)src.data, length);
src.skip_front(length);
return result;
}
void
ScanId3Apic(ConstBuffer<void> _buffer, TagHandler &handler) noexcept
{
auto buffer = ConstBuffer<uint8_t>::FromVoid(_buffer);
if (buffer.size < 4)
return;
buffer.skip_front(4); /* picture type */
const auto mime_type = ReadString(buffer);
if (mime_type.IsNull())
return;
/* description */
if (ReadString(buffer).IsNull())
return;
if (buffer.size < 20)
return;
buffer.skip_front(16);
const size_t image_size = FromBE32(*(const uint32_t *)buffer.data);
buffer.skip_front(4);
if (buffer.size < image_size)
return;
ConstBuffer<void> image(buffer.data, image_size);
// TODO: don't copy MIME type, pass StringView to TagHandler::OnPicture()
handler.OnPicture(std::string(mime_type.data, mime_type.size).c_str(),
image);
}
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