/// <summary>
/// Will write the data describing this metadata block to the given stream.
/// </summary>
/// <param name="targetStream">Stream to write the data to.</param>
public override void WriteBlockData(Stream targetStream)
{
// This is where the header will come
long headerPosition = targetStream.Position;
// Moving along, we'll write the header last!
targetStream.Seek(4, SeekOrigin.Current);
// 32-bit picture type
targetStream.Write(BinaryDataHelper.GetBytesUInt32((uint)this.pictureType), 0, 4);
byte[] mimeTypeData = Encoding.ASCII.GetBytes(this.mimeType);
// Length of the MIME type string (in bytes ...)
targetStream.Write(BinaryDataHelper.GetBytesUInt32((uint)mimeTypeData.Length), 0, 4);
// Only allows printable ascii characters (0x20 - 0x7e)
for (int i = 0; i < mimeTypeData.Length; i++)
{
if (mimeTypeData[i] < 0x20 || mimeTypeData[i] > 0x7e)
{
// Make sure we write the text correctly as specified by the format.
mimeTypeData[i] = 0x20;
}
}
targetStream.Write(mimeTypeData, 0, mimeTypeData.Length);
byte[] descriptionData = Encoding.UTF8.GetBytes(this.description);
// Length of the description string (in bytes ...)
targetStream.Write(BinaryDataHelper.GetBytesUInt32((uint)descriptionData.Length), 0, 4);
// The description of the picture (in UTF-8)
targetStream.Write(descriptionData, 0, descriptionData.Length);
targetStream.Write(BinaryDataHelper.GetBytesUInt32((uint)this.width), 0, 4);
targetStream.Write(BinaryDataHelper.GetBytesUInt32((uint)this.height), 0, 4);
targetStream.Write(BinaryDataHelper.GetBytesUInt32((uint)this.colorDepth), 0, 4);
targetStream.Write(BinaryDataHelper.GetBytesUInt32((uint)this.colors), 0, 4);
// If --> is the mime type, the data contains the URL ...
if (this.mimeType == "-->")
{
this.data = Encoding.ASCII.GetBytes(this.url);
}
if (this.data == null)
{
this.data = new byte[] { };
}
targetStream.Write(BinaryDataHelper.GetBytesUInt32((uint)this.data.Length), 0, 4);
targetStream.Write(this.data, 0, this.data.Length);
// Writing the header, now we have the required information on the variable length fields
CalculateMetadataBlockLength((uint)mimeTypeData.Length, (uint)descriptionData.Length, (uint)this.data.Length);
long currentPosition = targetStream.Position;
targetStream.Position = headerPosition;
this.Header.WriteHeaderData(targetStream);
targetStream.Position = currentPosition;
}
/// <summary>
/// Will write the data describing this metadata block to the given stream.
/// </summary>
/// <param name="targetStream">Stream to write the data to.</param>
public override void WriteBlockData(Stream targetStream)
{
this.Header.MetaDataBlockLength = 4 + (uint)this.applicationData.Length;
this.Header.WriteHeaderData(targetStream);
targetStream.Write(BinaryDataHelper.GetBytesUInt32(this.applicationID), 0, 4);
targetStream.Write(this.applicationData, 0, this.applicationData.Length);
}
/// <summary>
/// Will write the data describing this metadata block to the given stream.
/// </summary>
/// <param name="targetStream">Stream to write the data to.</param>
public override void WriteBlockData(Stream targetStream)
{
uint totalLength = 0;
long headerPosition = targetStream.Position;
this.Header.WriteHeaderData(targetStream);
// Write the vendor string (first write the length as a 32-bit uint and then the actual bytes
byte[] vendorData = System.Text.Encoding.UTF8.GetBytes(this.vendor);
byte[] number = BinaryDataHelper.GetBytesUInt32((uint)vendorData.Length);
targetStream.Write(BinaryDataHelper.SwitchEndianness(number, 0, 4), 0, 4);
targetStream.Write(vendorData, 0, vendorData.Length);
totalLength += 4 + (uint)vendorData.Length;
// Length of list of user comments (first a 32-bit uint, then the actual comments)
number = BinaryDataHelper.GetBytesUInt32((uint)this.comments.Count);
targetStream.Write(BinaryDataHelper.SwitchEndianness(number, 0, 4), 0, 4);
totalLength += 4;
foreach (var comment in this.comments)
{
foreach (var value in comment.Value)
{
string commentText = string.Format("{0}={1}", comment.Key, value);
byte[] commentData = System.Text.Encoding.UTF8.GetBytes(commentText);
number = BinaryDataHelper.GetBytesUInt32((uint)commentData.Length);
targetStream.Write(BinaryDataHelper.SwitchEndianness(number, 0, 4), 0, 4);
targetStream.Write(commentData, 0, commentData.Length);
totalLength += 4 + (uint)commentData.Length;
}
}
long endPosition = targetStream.Position;
targetStream.Seek(headerPosition, SeekOrigin.Begin);
this.Header.MetaDataBlockLength = totalLength;
this.Header.WriteHeaderData(targetStream);
targetStream.Seek(endPosition, SeekOrigin.Begin);
// Note: FLAC does NOT have the framing bit for vorbis so we don't have to write this.
}
