mirror of
https://github.com/taglib/taglib.git
synced 2025-06-04 01:28:21 -04:00
931bb042c3
FileRef doesn't work with ByteVectorStream as reported at #796, since ByteVectorStream is not associated with a file name and FileRef detects file types based on file extensions. This commit makes FileRef to work with ByteVectorStream by enabling it to detect file types based on the actual content of a stream.
102 lines
3.1 KiB
C++
102 lines
3.1 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 TagLib;
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long Utils::findID3v1(File *file)
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{
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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 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 Utils::findID3v2(File *file)
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{
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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 Utils::findAPE(File *file, long id3v1Location)
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{
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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 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 TagLib::Utils::readHeader(IOStream *stream, unsigned int length, bool skipID3v2)
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{
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if(!stream || !stream->isOpen())
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return ByteVector();
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const long originalPosition = stream->tell();
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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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return header;
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}
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