/// <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);
}
}
/// <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");
}
}