/*************************************************************************** * Copyright 2005 Raphaƫl Slinckx ****************************************************************************/ /* THIS FILE IS LICENSED UNDER THE MIT LICENSE AS OUTLINED IMMEDIATELY BELOW: * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ using System; using System.IO; using Entagged.Audioformats.Exceptions; namespace Entagged.Audioformats.Util { public abstract class AudioFileReader { protected abstract EncodingInfo GetEncodingInfo(Stream raf, string mime); protected abstract Tag GetTag(Stream raf, string mime); public AudioFileContainer Read(string f, string mime) { FileStream stream; try { stream = File.Open(f, FileMode.Open, FileAccess.Read, FileShare.Read); } catch (Exception e) { throw new CannotReadException("\"" + f + "\": " + e.Message); } return Read(stream, mime); } public AudioFileContainer Read(Stream stream, string mime) { if(! stream.CanSeek) { throw new CannotReadException("Stream not seekable"); } if(stream.Length <= 150) { throw new CannotReadException("Less than 150 byte stream"); } try { stream.Seek(0, SeekOrigin.Begin); EncodingInfo info = GetEncodingInfo(stream, mime); Tag tag = null; try { stream.Seek(0, SeekOrigin.Begin); tag = GetTag(stream, mime); } catch(CannotReadException e) { // Do nothing } return new AudioFileContainer(info, tag); } catch(Exception e) { throw new CannotReadException(e.ToString()); } finally { try { if(stream != null) { stream.Close(); } } catch(Exception ex) { /* We tried everything... */ } } } } }