/// <summary>
/// attempts to find a match for the provided data in the library.
/// if it is present, it writes the long pointer to the location record in the library
/// if it is absent, it adds a new record to the library and returns a pointer to that
/// </summary>
void matchOrAdd(BinaryWriter outfile, byte[] data, Span.Type spanType)
{
foreach (LibraryBlob lb in libraryBlobs)
{
if (areBuffersEqual(data, lb.blob))
{
//if(lb.blob.Length > 1000) Console.WriteLine("{0} long match!",lb.blob.Length);
outfile.Write(lb.start);
return;
}
}
MemoryStream mstemp = new MemoryStream();
BinaryWriter bw = new BinaryWriter(mstemp);
//didnt find a match.. add to library
//perhaps encode the blob
if ((spanType & Span.Type.Flac) != 0)
{
byte[] flacdata = FLACDotNet.FLACWriter.Encode(data,
(spanType & Span.Type.Bits16) != 0 ? 16 : 8,
(spanType & Span.Type.Stereo) != 0 ? 2 : 1,
(spanType & Span.Type.StereoPlanar) != 0,
(spanType & Span.Type.Unsigned) != 0,
(spanType & Span.Type.XMDelta) != 0
);
//sometimes flac will do a bad job. write the raw bytes out in that case
if (flacdata.Length >= data.Length)
{
Console.WriteLine("Dumping {0} raw sample bytes with bad flac performance", data.Length);
bw.Write((byte)0); bw.Flush(); //write the encoding type
mstemp.Write(data, 0, data.Length);
}
else
{
bw.Write((byte)spanType); bw.Flush(); //write the encoding type
bw.Write(flacdata.Length); bw.Flush(); //write the encoded length
mstemp.Write(flacdata, 0, flacdata.Length);
Console.WriteLine("Flac [{0}]: {1} ({2})", spanType, (decimal)flacdata.Length / (decimal)data.Length, data.Length);
}
}
else
{
bw.Write((byte)0); bw.Flush(); //write the encoding type
mstemp.Write(data, 0, data.Length);
}
LibraryBlob newBlob = new LibraryBlob();
newBlob.start = libraryCursor;
newBlob.blob = (byte[])data.Clone();
newBlob.blob_encoded = mstemp.ToArray();;
libraryCursor += newBlob.blob_encoded.Length;
libraryBlobs.Add(newBlob);
outfile.Write(newBlob.start);
}
/// <summary>
/// attempts to find a match for the provided data in the library.
/// if it is present, it writes the long pointer to the location record in the library
/// if it is absent, it adds a new record to the library and returns a pointer to that
/// </summary>
void matchOrAdd(BinaryWriter outfile, byte[] data, Span.Type spanType)
{
foreach(LibraryBlob lb in libraryBlobs) {
if(areBuffersEqual(data, lb.blob)) {
//if(lb.blob.Length > 1000) Console.WriteLine("{0} long match!",lb.blob.Length);
outfile.Write(lb.start);
return;
}
}
MemoryStream mstemp = new MemoryStream();
BinaryWriter bw = new BinaryWriter(mstemp);
//didnt find a match.. add to library
//perhaps encode the blob
if((spanType & Span.Type.Flac) != 0) {
byte[] flacdata = FLACDotNet.FLACWriter.Encode(data,
(spanType & Span.Type.Bits16) != 0 ? 16 : 8,
(spanType & Span.Type.Stereo) != 0 ? 2 : 1,
(spanType & Span.Type.StereoPlanar) != 0,
(spanType & Span.Type.Unsigned) != 0,
(spanType & Span.Type.XMDelta) != 0
);
//sometimes flac will do a bad job. write the raw bytes out in that case
if(flacdata.Length >= data.Length) {
Console.WriteLine("Dumping {0} raw sample bytes with bad flac performance", data.Length);
bw.Write((byte)0); bw.Flush(); //write the encoding type
mstemp.Write(data, 0, data.Length);
} else {
bw.Write((byte)spanType); bw.Flush(); //write the encoding type
bw.Write(flacdata.Length); bw.Flush(); //write the encoded length
mstemp.Write(flacdata, 0, flacdata.Length);
Console.WriteLine("Flac [{0}]: {1} ({2})", spanType, (decimal)flacdata.Length / (decimal)data.Length, data.Length);
}
} else {
bw.Write((byte)0); bw.Flush(); //write the encoding type
mstemp.Write(data, 0, data.Length);
}
LibraryBlob newBlob = new LibraryBlob();
newBlob.start = libraryCursor;
newBlob.blob = (byte[])data.Clone();
newBlob.blob_encoded = mstemp.ToArray(); ;
libraryCursor += newBlob.blob_encoded.Length;
libraryBlobs.Add(newBlob);
outfile.Write(newBlob.start);
}
