/// <summary>
/// Write the given field with the given writer, using the WMA-like format
/// </summary>
/// <param name="w">Write to write the fields to</param>
/// <param name="fieldName">Field name</param>
/// <param name="fieldValue">Field value</param>
/// <param name="isNumeric">True if the field is numeric; false if not (will be formatted as string)</param>
public static void WriteField(BinaryWriter w, string fieldName, string fieldValue, bool isNumeric)
{
long frameSizePos, midSizePos, finalFramePos;
frameSizePos = w.BaseStream.Position;
w.Write(0); // To be rewritten at the end of the method
w.Write(StreamUtils.EncodeBEInt32(fieldName.Length));
w.Write(Utils.Latin1Encoding.GetBytes(fieldName));
w.Write((ushort)0); // Frame class ?
w.Write(StreamUtils.EncodeBEInt16(1)); // ? (always 1)
midSizePos = w.BaseStream.Position;
w.Write(0); // To be rewritten at the end of the method
if (isNumeric)
{
w.Write(StreamUtils.EncodeBEInt16(19)); // ?? (works for rating)
w.Write(long.Parse(fieldValue)); // 64-bit little-endian integer ?
}
else
{
w.Write(StreamUtils.EncodeBEInt16(8)); // ?? (always 8)
w.Write(Encoding.Unicode.GetBytes(fieldValue + '\0')); // String is null-terminated
}
finalFramePos = w.BaseStream.Position;
// Go back to frame size locations to write their actual size
w.BaseStream.Seek(midSizePos, SeekOrigin.Begin);
w.Write(StreamUtils.EncodeBEInt32((int)(finalFramePos - midSizePos)));
w.BaseStream.Seek(frameSizePos, SeekOrigin.Begin);
w.Write(StreamUtils.EncodeBEInt32((int)(finalFramePos - frameSizePos)));
w.BaseStream.Seek(finalFramePos, SeekOrigin.Begin);
}
public void StreamUtils_BEInt16Converters()
{
short intValue = 0x3529;
Assert.AreEqual((short)0x00FF, StreamUtils.DecodeBEInt16(new byte[2] {
0x00, 0xFF
}));
byte[] byteValue = StreamUtils.EncodeBEInt16(intValue);
Assert.AreEqual(intValue, StreamUtils.DecodeBEInt16(byteValue));
}
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);
}