109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
/***************************************************************************
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copyright : (C) 2015 by Tsuda Kageyu
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email : tsuda.kageyu@gmail.com
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
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* 02110-1301 USA *
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* *
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* Alternatively, this file is available under the Mozilla Public *
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* License Version 1.1. You may obtain a copy of the License at *
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* http://www.mozilla.org/MPL/ *
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***************************************************************************/
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#include <tfile.h>
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#include "id3v1tag.h"
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#include "id3v2header.h"
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#include "apetag.h"
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#include "tagutils.h"
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using namespace Strawberry_TagLib::TagLib;
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long long Utils::findID3v1(File *file) {
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if (!file->isValid())
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return -1;
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file->seek(-128, File::End);
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const long long p = file->tell();
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if (file->readBlock(3) == ID3v1::Tag::fileIdentifier())
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return p;
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return -1;
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}
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long long Utils::findID3v2(File *file) {
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if (!file->isValid())
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return -1;
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file->seek(0);
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if (file->readBlock(3) == ID3v2::Header::fileIdentifier())
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return 0;
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return -1;
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}
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long long Utils::findAPE(File *file, long long id3v1Location) {
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if (!file->isValid())
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return -1;
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if (id3v1Location >= 0)
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file->seek(id3v1Location - 32, File::Beginning);
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else
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file->seek(-32, File::End);
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const long long p = file->tell();
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if (file->readBlock(8) == APE::Tag::fileIdentifier())
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return p;
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return -1;
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}
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ByteVector Strawberry_TagLib::TagLib::Utils::readHeader(IOStream *stream, size_t length, bool skipID3v2, long long *headerOffset) {
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if (!stream || !stream->isOpen())
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return ByteVector();
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const long long originalPosition = stream->tell();
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long long bufferOffset = 0;
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if (skipID3v2) {
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stream->seek(0);
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const ByteVector data = stream->readBlock(ID3v2::Header::size());
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if (data.startsWith(ID3v2::Header::fileIdentifier()))
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bufferOffset = ID3v2::Header(data).completeTagSize();
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}
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stream->seek(bufferOffset);
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const ByteVector header = stream->readBlock(length);
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stream->seek(originalPosition);
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if (headerOffset)
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*headerOffset = bufferOffset;
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return header;
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}
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