コード例 #1
0
ファイル: ID3v2Tag.cs プロジェクト: felixwatts/PodPuppy
        /// <summary>
        /// Reads an ID3v2 tag from a stream. Returns null if no ID3v2 tag can be found
        /// in the stream.
        /// </summary>
        /// <param name="stream">The stream to read.</param>
        /// <returns>The tag read from the stream, or null if no ID3v2 tag can be found.</returns>
        public static ID3v2Tag ReadTag(Stream stream)
        {
            ID3Versions version = LookForTag(stream);
            ID3v2Tag    tag     = null;

            if ((version & ID3Versions.V2) == ID3Versions.V2)
            {
                tag = new ID3v2Tag();

                tag.headerFlags = ReadFlags(stream, version);

                int tagSize = ReadTagSize(stream);

                // Go to the first byte after the header
                stream.Seek(TAG_HEADER_LENGTH, SeekOrigin.Begin);

                while (stream.Position < tagSize)
                {
                    ID3v2Frame newFrame = ID3v2Frame.ReadFrame(stream, version);
                    if (newFrame != null)
                    {
                        tag.AddFrame(newFrame);
                    }
                    else
                    {
                        break;
                    }
                }
            }

            return(tag);
        }
コード例 #2
0
ファイル: ID3v2Tag.cs プロジェクト: felixwatts/PodPuppy
        /// <summary>
        /// Copy constructor.
        /// </summary>
        /// <param name="tag">The tag to copy.</param>
        public ID3v2Tag(ID3Tag tag)
            : base(tag)
        {
            ID3v2Tag v2Tag = tag as ID3v2Tag;

            if (v2Tag != null)
            {
                this.paddingSize = v2Tag.paddingSize;
                this.headerFlags = v2Tag.headerFlags;

                this.frames = new Dictionary <FrameType, ID3v2Frame>(v2Tag.FrameCount);
                foreach (ID3v2Frame frame in v2Tag.Frames)
                {
                    this.AddFrame(frame.Copy());
                }
            }
        }
コード例 #3
0
ファイル: ID3v2Tag.cs プロジェクト: felixwatts/PodPuppy
        /// <summary>
        /// Examines the stream to see if there is sufficient space for the tag to be written.
        /// If there is not enough space, sufficient space is made.
        /// </summary>
        /// <param name="stream">The stream to check for space.</param>
        /// <param name="writeVersion">The version to use in calculating space required.</param>
        private void EnsureSpace(Stream stream, ID3Versions writeVersion)
        {
            ID3Versions existingTagVersion = ID3v2Tag.LookForTag(stream);

            if ((existingTagVersion & ID3Versions.V2) == ID3Versions.V2)
            {
                int existingSize = ReadTagSize(stream);
                if (existingSize < this.GetTotalSize(writeVersion))
                {
                    SmartPadding(stream, existingSize, writeVersion);
                }
                else
                {
                    this.PaddingSize += existingSize - this.GetTotalSize(writeVersion);
                }
            }
            else
            {
                SmartPadding(stream, 0, writeVersion);
            }
        }
コード例 #4
0
ファイル: ID3v2Tag.cs プロジェクト: felixwatts/PodPuppy
        /// <summary>
        /// Removes any ID3v2 tag from a stream.
        /// </summary>
        /// <param name="stream">The stream whose ID3v2 tag will be removed.</param>
        public static void RemoveTag(Stream stream)
        {
            ID3Versions version = ID3v2Tag.LookForTag(stream);

            if ((version & ID3Versions.V2) == ID3Versions.V2)
            {
                int  tagSize = ReadTagSize(stream);
                long newSize = stream.Length - tagSize;

                int    bufLength;
                long   startPosition;
                byte[] buffer;

                stream.Seek(tagSize, SeekOrigin.Begin);
                while (stream.Position < stream.Length)
                {
                    bufLength = 10000;
                    if (stream.Position + bufLength > stream.Length)
                    {
                        bufLength = (int)(stream.Length - stream.Position);
                    }

                    buffer = new byte[bufLength];

                    stream.Read(buffer, 0, bufLength);
                    startPosition   = stream.Position;
                    stream.Position = startPosition - (tagSize + bufLength);
                    stream.Write(buffer, 0, bufLength);
                    stream.Position = startPosition;
                }
                stream.Flush();
                stream.SetLength(newSize);
            }
            else
            {
                throw new TagNotFoundException("No tag found");
            }
        }