/// <summary>
/// Compress
/// </summary>
/// <param name="dataXf">can be null</param>
/// <param name="input">input array to compress</param>
/// <param name="compressedData"></param>
internal void Compress(DataXform dataXf, int[] input, List<byte> compressedData)
{
//
// use the writer to write to the list<byte>
//
BitStreamWriter writer = new BitStreamWriter(compressedData);
if (null != dataXf)
{
dataXf.ResetState();
int xfData = 0;
int xfExtra = 0;
for (uint i = 0; i < input.Length; i++)
{
dataXf.Transform(input[i], ref xfData, ref xfExtra);
Encode(xfData, xfExtra, writer);
}
}
else
{
for (uint i = 0; i < input.Length; i++)
{
Encode(input[i], 0, writer);
}
}
}
/// <summary>
/// Compress
/// </summary>
/// <param name="dataXf">can be null</param>
/// <param name="input">input array to compress</param>
/// <param name="compressedData"></param>
internal void Compress(DataXform dataXf, int[] input, List <byte> compressedData)
{
//
// use the writer to write to the list<byte>
//
BitStreamWriter writer = new BitStreamWriter(compressedData);
if (null != dataXf)
{
dataXf.ResetState();
int xfData = 0;
int xfExtra = 0;
for (uint i = 0; i < input.Length; i++)
{
dataXf.Transform(input[i], ref xfData, ref xfExtra);
Encode(xfData, xfExtra, writer);
}
}
else
{
for (uint i = 0; i < input.Length; i++)
{
Encode(input[i], 0, writer);
}
}
}
/// <summary>
/// Uncompress
/// </summary>
/// <param name="dtxf"></param>
/// <param name="input"></param>
/// <param name="startIndex"></param>
/// <param name="outputBuffer"></param>
internal uint Uncompress(DataXform dtxf, byte[] input, int startIndex, int[] outputBuffer)
{
Debug.Assert(input != null);
Debug.Assert(input.Length >= 2);
Debug.Assert(startIndex == 1);
Debug.Assert(outputBuffer != null);
Debug.Assert(outputBuffer.Length != 0);
BitStreamReader reader = new BitStreamReader(input, startIndex);
int xfExtra = 0, xfData = 0;
int outputBufferIndex = 0;
if (null != dtxf)
{
dtxf.ResetState();
while (!reader.EndOfStream)
{
Decode(ref xfData, ref xfExtra, reader);
int uncompressed = dtxf.InverseTransform(xfData, xfExtra);
Debug.Assert(outputBufferIndex < outputBuffer.Length);
outputBuffer[outputBufferIndex++] = uncompressed;
if (outputBufferIndex == outputBuffer.Length)
{
//only write as much as the outputbuffer can hold
//this is assumed by calling code
break;
}
}
}
else
{
while (!reader.EndOfStream)
{
Decode(ref xfData, ref xfExtra, reader);
Debug.Assert(outputBufferIndex < outputBuffer.Length);
outputBuffer[outputBufferIndex++] = xfData;
if (outputBufferIndex == outputBuffer.Length)
{
//only write as much as the outputbuffer can hold
//this is assumed by calling code
break;
}
}
}
return((uint)((reader.CurrentIndex + 1) - startIndex)); //we include startIndex in the read count
}
/// <summary>
/// Uncompress
/// </summary>
/// <param name="dtxf"></param>
/// <param name="input"></param>
/// <param name="startIndex"></param>
/// <param name="outputBuffer"></param>
internal uint Uncompress(DataXform dtxf, byte[] input, int startIndex, int[] outputBuffer)
{
Debug.Assert(input != null);
Debug.Assert(input.Length >= 2);
Debug.Assert(startIndex == 1);
Debug.Assert(outputBuffer != null);
Debug.Assert(outputBuffer.Length != 0);
BitStreamReader reader = new BitStreamReader(input, startIndex);
int xfExtra = 0, xfData = 0;
int outputBufferIndex = 0;
if (null != dtxf)
{
dtxf.ResetState();
while (!reader.EndOfStream)
{
Decode(ref xfData, ref xfExtra, reader);
int uncompressed = dtxf.InverseTransform(xfData, xfExtra);
Debug.Assert(outputBufferIndex < outputBuffer.Length);
outputBuffer[outputBufferIndex++] = uncompressed;
if (outputBufferIndex == outputBuffer.Length)
{
//only write as much as the outputbuffer can hold
//this is assumed by calling code
break;
}
}
}
else
{
while (!reader.EndOfStream)
{
Decode(ref xfData, ref xfExtra, reader);
Debug.Assert(outputBufferIndex < outputBuffer.Length);
outputBuffer[outputBufferIndex++] = xfData;
if (outputBufferIndex == outputBuffer.Length)
{
//only write as much as the outputbuffer can hold
//this is assumed by calling code
break;
}
}
}
return (uint)((reader.CurrentIndex + 1) - startIndex); //we include startIndex in the read count
}
