////------------------------------------------------------------------------------------------------------------------------------
private static void ValidateHeader(MusicMatchHeader header, MusicMatchHeader footer)
{
#if DEBUG
if (header != null && footer != null)
{
if (header.MusicMatchVersion != footer.MusicMatchVersion)
{
throw new System.IO.InvalidDataException(
String.Format("The MusicMatch header version {0} does not match footer version {1}.", header.MusicMatchVersion, footer.MusicMatchVersion));
}
}
if (header != null)
{
if (header.Padding1.Any(c => c != 0x00))
{
throw new System.IO.InvalidDataException(
String.Format(
"The MusicMatch header has invalid padding1 bytes: {0}.",
String.Join(" ", header.Padding1.Where(c => c != 0x00).Select(c => String.Format("0:x2")))));
}
if (header.Padding2.Any(c => c != 0x00))
{
throw new System.IO.InvalidDataException(
String.Format(
"The MusicMatch header has invalid padding2 bytes: {0}.",
String.Join(" ", header.Padding2.Where(c => c != 0x00).Select(c => String.Format("0:x2")))));
}
if (header.Padding3.Any(c => c != 0x00))
{
throw new System.IO.InvalidDataException(
String.Format(
"The MusicMatch header has invalid padding3 bytes: {0}.",
String.Join(" ", header.Padding3.Where(c => c != 0x00).Select(c => String.Format("0:x2")))));
}
if (header.SpacePadding2.Any(c => c != 0x20))
{
throw new System.IO.InvalidDataException(
String.Format(
"The MusicMatch header has invalid space padding bytes: {0}.",
String.Join(" ", header.Padding1.Where(c => c != 0x20).Select(c => String.Format("0:x2")))));
}
}
if (footer != null)
{
}
#else
return;
#endif
}
private static MusicMatchHeader ReadHeaderFooter(StreamBuffer stream, long startHeaderPosition, long endHeaderPosition, IList<byte> identifierBytes, TagOrigin tagOrigin)
{
if (stream == null)
throw new ArgumentNullException("stream");
stream.Position = startHeaderPosition;
while (startHeaderPosition < endHeaderPosition)
{
int y = 0;
while (stream.ReadByte() == identifierBytes[y++])
{
startHeaderPosition++;
if (y != identifierBytes.Count)
continue;
if (tagOrigin == TagOrigin.Start)
{
MusicMatchHeader header = new MusicMatchHeader
{
Position = stream.Position - identifierBytes.Count,
Padding1 = new byte[2],
Padding2 = new byte[2],
Padding3 = new byte[2],
SpacePadding2 = new byte[226]
};
// 0x00 0x00 Padding
stream.Read(header.Padding1, header.Padding1.Length);
// <8-byte numerical ASCII string>
header.XingEncoderVersion = stream.ReadString(8);
// 0x00 0x00 Padding
stream.Read(header.Padding2, header.Padding2.Length);
// Xing encoder version <8-byte numerical ASCII string>
header.MusicMatchVersion = stream.ReadString(8);
// 0x00 0x00 Padding
stream.Read(header.Padding3, header.Padding3.Length);
// Space padding <226 * 0x20 >
stream.Read(header.SpacePadding2, header.SpacePadding2.Length);
ValidateHeader(header, null);
return header;
}
if (tagOrigin == TagOrigin.End)
{
MusicMatchHeader footer = new MusicMatchHeader
{
Position = stream.Position - identifierBytes.Count,
SpacePadding1 = new byte[13],
SpacePadding2 = new byte[12]
};
// Space padding <13 * 0x20>
stream.Read(footer.SpacePadding1, 13);
// version <4-byte numerical ASCII string> e.g. 3.05
footer.MusicMatchVersion = stream.ReadString(4);
// Space padding <12 * 0x20>
stream.Read(footer.SpacePadding2, 12);
ValidateHeader(null, footer);
return footer;
}
}
startHeaderPosition++;
}
return null;
}
/// <summary>
/// Equals the specified <see cref="MusicMatchHeader"/>.
/// </summary>
/// <param name="hdr">The <see cref="MusicMatchHeader"/>.</param>
/// <returns>true if equal; false otherwise.</returns>
public bool Equals(MusicMatchHeader hdr)
{
if (ReferenceEquals(null, hdr))
return false;
if (ReferenceEquals(this, hdr))
return true;
return (hdr.Identifier == Identifier) && (hdr.XingEncoderVersion == XingEncoderVersion)
&& (hdr.MusicMatchVersion == MusicMatchVersion);
}
