private void writeCommentChunk(BinaryWriter w, MetaFieldInfo info, string comment = "")
{
byte[] commentData = null;
if (null == info) // Plain string
{
w.Write(StreamUtils.EncodeBEUInt32(encodeTimestamp(DateTime.Now)));
w.Write((short)0);
commentData = Utils.Latin1Encoding.GetBytes(comment);
}
else
{
w.Write(StreamUtils.EncodeBEUInt32(((CommentData)info.SpecificData).Timestamp));
w.Write(StreamUtils.EncodeBEInt16(((CommentData)info.SpecificData).MarkerId));
commentData = Utils.Latin1Encoding.GetBytes(info.Value);
}
w.Write(StreamUtils.EncodeBEUInt16((ushort)commentData.Length));
w.Write(commentData);
}
protected override int write(TagData tag, BinaryWriter w, string zone)
{
int result = 0;
if (zone.Equals(CHUNKTYPE_NAME))
{
if (tag.Title.Length > 0)
{
w.Write(Utils.Latin1Encoding.GetBytes(zone));
long sizePos = w.BaseStream.Position;
w.Write(0); // Placeholder for field size that will be rewritten at the end of the method
byte[] strBytes = Utils.Latin1Encoding.GetBytes(tag.Title);
w.Write(strBytes);
w.BaseStream.Seek(sizePos, SeekOrigin.Begin);
w.Write(StreamUtils.EncodeBEInt32(strBytes.Length));
result++;
}
}
else if (zone.Equals(CHUNKTYPE_AUTHOR))
{
if (tag.Artist.Length > 0)
{
w.Write(Utils.Latin1Encoding.GetBytes(zone));
long sizePos = w.BaseStream.Position;
w.Write(0); // Placeholder for field size that will be rewritten at the end of the method
byte[] strBytes = Utils.Latin1Encoding.GetBytes(tag.Artist);
w.Write(strBytes);
w.BaseStream.Seek(sizePos, SeekOrigin.Begin);
w.Write(StreamUtils.EncodeBEInt32(strBytes.Length));
result++;
}
}
else if (zone.Equals(CHUNKTYPE_COPYRIGHT))
{
if (tag.Copyright.Length > 0)
{
w.Write(Utils.Latin1Encoding.GetBytes(zone));
long sizePos = w.BaseStream.Position;
w.Write(0); // Placeholder for field size that will be rewritten at the end of the method
byte[] strBytes = Utils.Latin1Encoding.GetBytes(tag.Copyright);
w.Write(strBytes);
w.BaseStream.Seek(sizePos, SeekOrigin.Begin);
w.Write(StreamUtils.EncodeBEInt32(strBytes.Length));
result++;
}
}
else if (zone.StartsWith(CHUNKTYPE_ANNOTATION))
{
// Do not write anything, this field is deprecated (Cf. specs "Use of this chunk is discouraged within FORM AIFC. The more refined Comments Chunk should be used instead")
}
else if (zone.StartsWith(CHUNKTYPE_COMMENTS))
{
bool applicable = tag.Comment.Length > 0;
if (!applicable && tag.AdditionalFields.Count > 0)
{
foreach (MetaFieldInfo fieldInfo in tag.AdditionalFields)
{
applicable = (fieldInfo.NativeFieldCode.StartsWith(CHUNKTYPE_COMMENTS));
if (applicable)
{
break;
}
}
}
if (applicable)
{
ushort numComments = 0;
w.Write(Utils.Latin1Encoding.GetBytes(CHUNKTYPE_COMMENTS));
long sizePos = w.BaseStream.Position;
w.Write(0); // Placeholder for 'chunk size' field that will be rewritten at the end of the method
w.Write((ushort)0); // Placeholder for 'number of comments' field that will be rewritten at the end of the method
// First write generic comments (those linked to the Comment field)
string[] comments = tag.Comment.Split(Settings.InternalValueSeparator);
foreach (string s in comments)
{
writeCommentChunk(w, null, s);
numComments++;
}
// Then write comments linked to a Marker ID
if (tag.AdditionalFields != null && tag.AdditionalFields.Count > 0)
{
foreach (MetaFieldInfo fieldInfo in tag.AdditionalFields)
{
if (fieldInfo.NativeFieldCode.StartsWith(CHUNKTYPE_COMMENTS))
{
if (((CommentData)fieldInfo.SpecificData).MarkerId != 0)
{
writeCommentChunk(w, fieldInfo);
numComments++;
}
}
}
}
long dataEndPos = w.BaseStream.Position;
w.BaseStream.Seek(sizePos, SeekOrigin.Begin);
w.Write(StreamUtils.EncodeBEInt32((int)(dataEndPos - sizePos - 4)));
w.Write(StreamUtils.EncodeBEUInt16(numComments));
result++;
}
}
return(result);
}
