public void Encode(Stream internalStream)
{
#region Validation
if (internalStream == null)
{
throw new ArgumentNullException(nameof(internalStream), "You need to provide a stream.");
}
#endregion
//If it's the first step.
var isFirst = true;
var clearFlag = (1 << ColorDepth);
var endOfFileFlag = clearFlag + 1;
var codeTable = new Dictionary <string, int>();
//Number of indexes of the currently processed bytes.
var releaseCount = 0;
var codeSize = (byte)(ColorDepth + 1);
var availableCode = endOfFileFlag + 1;
var maskCode = (1 << codeSize) - 1;
var bitEncoder = new BitEncoder(codeSize);
//Initial code size.
internalStream.WriteByte((byte)ColorDepth);
//First thing being added.
bitEncoder.Add(clearFlag);
int suffix = 0;
while (releaseCount < IndexedPixels.Length)
{
#region If it's the first byte
if (isFirst)
{
//The first time, the suffix is set to the first index bytes.
suffix = IndexedPixels[releaseCount++];
//If it's the last one.
if (releaseCount == IndexedPixels.Length)
{
bitEncoder.Add(suffix);
bitEncoder.Add(endOfFileFlag);
bitEncoder.End();
internalStream.WriteByte((byte)(bitEncoder.Length));
internalStream.Write(bitEncoder.OutList.ToArray(), 0, bitEncoder.Length);
bitEncoder.OutList.Clear();
break;
}
isFirst = false;
continue;
}
#endregion
#region Before and after the change, and the constituent entities
var prefix = suffix;
suffix = IndexedPixels[releaseCount++];
string entry = $"{prefix},{suffix}";
#endregion
#region If you do not know the current entity, entities encoded, and output the prefix
if (!codeTable.ContainsKey(entry))
{
//If the current entity is not encoded, then output the prefix
bitEncoder.Add(prefix);
//And the current entity is encoded. Inserts and after that adds the availableCode count.
codeTable.Add(entry, availableCode++);
if (availableCode > (MaxStackSize - 3))
{
//Insert the clear tag, reinvent
codeTable.Clear();
ColorDepth = InitDataSize;
codeSize = (byte)(ColorDepth + 1);
availableCode = endOfFileFlag + 1;
maskCode = (1 << codeSize) - 1;
bitEncoder.Add(clearFlag);
bitEncoder.InBit = codeSize;
}
else if (availableCode > (1 << codeSize))
{
//If the current code is greater than the current code available to represent values
ColorDepth++;
codeSize = (byte)(ColorDepth + 1);
bitEncoder.InBit = codeSize;
maskCode = (1 << codeSize) - 1;
}
//Divides into more blocks.
if (bitEncoder.Length >= 255)
{
//Size of the block.
internalStream.WriteByte(255);
//Writes the 255 sized block.
internalStream.Write(bitEncoder.OutList.ToArray(), 0, 255);
if (bitEncoder.Length > 255)
{
var leftBuffer = new byte[bitEncoder.Length - 255];
//Removes the last writen 255 bytes.
bitEncoder.OutList.CopyTo(255, leftBuffer, 0, leftBuffer.Length);
bitEncoder.OutList.Clear();
bitEncoder.OutList.AddRange(leftBuffer);
}
else
{
bitEncoder.OutList.Clear();
}
}
}
#endregion
#region If you know the current entity, set the suffixes to the current index value of an entity
else
{
//Set the suffix to the current entity encoding
suffix = codeTable[entry];
}
#endregion
//if (releaseCount == 40240)
// suffix = suffix;
#region To the end of an image, writes over identity, and outputs the current codes left in the data stream
if (releaseCount == IndexedPixels.Length)
{
bitEncoder.Add(suffix); //Adds the last sufix.
bitEncoder.Add(endOfFileFlag); //End of the LZW
bitEncoder.End();
//If the block size if greater than 255, divides into two.
if (bitEncoder.Length > 255)
{
var leftBuffer = new byte[bitEncoder.Length - 255];
bitEncoder.OutList.CopyTo(255, leftBuffer, 0, leftBuffer.Length);
bitEncoder.OutList.Clear();
bitEncoder.OutList.AddRange(leftBuffer);
internalStream.WriteByte((byte)leftBuffer.Length);
internalStream.Write(leftBuffer, 0, leftBuffer.Length);
}
else
{
internalStream.WriteByte((byte)(bitEncoder.Length));
internalStream.Write(bitEncoder.OutList.ToArray(), 0, bitEncoder.Length);
bitEncoder.OutList.Clear();
}
break;
}
#endregion
}
//For 3 weeks I forgot to add this little piece of sh*t, my gifs were always corrupted...
//Signals the end of the list of blocks.
internalStream.WriteByte(0);
}
public void Encode(Stream internalStream)
{
#region Validation
if (internalStream == null)
throw new ArgumentNullException("internalStream", "You need to provide a stream.");
#endregion
//If it's the first step.
var isFirst = true;
var clearFlag = (1 << ColorDepth);
var endOfFileFlag = clearFlag + 1;
var codeTable = new Dictionary<string, int>();
//Number of indexes of the currently processed bytes.
var releaseCount = 0;
var codeSize = (byte)(ColorDepth + 1);
var availableCode = endOfFileFlag + 1;
var maskCode = (1 << codeSize) - 1;
var bitEncoder = new BitEncoder(codeSize);
//Initial code size.
internalStream.WriteByte((byte)ColorDepth);
//First thing add.
bitEncoder.Add(clearFlag);
int suffix = Nullcode;
while (releaseCount < IndexedPixels.Length)
{
#region If it's the first byte
if (isFirst)
{
//The first time, the suffix is set to the first index bytes.
suffix = IndexedPixels[releaseCount++];
//If it's the last one.
if (releaseCount == IndexedPixels.Length)
{
bitEncoder.Add(suffix);
bitEncoder.Add(endOfFileFlag);
bitEncoder.End();
internalStream.WriteByte((byte)(bitEncoder.Length));
internalStream.Write(bitEncoder.OutList.ToArray(), 0, bitEncoder.Length);
bitEncoder.OutList.Clear();
break;
}
isFirst = false;
continue;
}
#endregion
#region Before and after the change, and the constituent entities
var prefix = suffix;
suffix = IndexedPixels[releaseCount++];
string entry = $"{prefix},{suffix}";
#endregion
#region If you do not know the current entity, entities encoded, and output the prefix
if (!codeTable.ContainsKey(entry))
{
//If the current entity is not encoded, then the output prefix
bitEncoder.Add(prefix);
//And the current entity is encoded. Inserts and after that adds the availableCode count.
codeTable.Add(entry, availableCode++);
if (availableCode > (MaxStackSize - 3))
{
//Insert the clear tag, reinvent
codeTable.Clear();
ColorDepth = InitDataSize;
codeSize = (byte)(ColorDepth + 1);
availableCode = endOfFileFlag + 1;
maskCode = (1 << codeSize) - 1;
bitEncoder.Add(clearFlag);
bitEncoder.InBit = codeSize;
}
else if (availableCode > (1 << codeSize))
{
//If the current code is greater than the current code available to represent values
ColorDepth++;
codeSize = (byte)(ColorDepth + 1);
bitEncoder.InBit = codeSize;
maskCode = (1 << codeSize) - 1;
}
//Divides into more blocks.
if (bitEncoder.Length >= 255)
{
//Size of the block.
internalStream.WriteByte(255);
//Writes the 255 sized block.
internalStream.Write(bitEncoder.OutList.ToArray(), 0, 255);
if (bitEncoder.Length > 255)
{
var leftBuffer = new byte[bitEncoder.Length - 255];
//Removes the last writen 255 bytes.
bitEncoder.OutList.CopyTo(255, leftBuffer, 0, leftBuffer.Length);
bitEncoder.OutList.Clear();
bitEncoder.OutList.AddRange(leftBuffer);
}
else
{
bitEncoder.OutList.Clear();
}
}
}
#endregion
#region If you know the current entity, set the suffixes to the current index value of an entity
else
{
//Set the suffix to the current entity encoding
suffix = codeTable[entry];
}
#endregion
#region To the end of an image, writes over identity, and outputs the current codes left in the data stream
if (releaseCount == IndexedPixels.Length)
{
bitEncoder.Add(suffix); //Adds the last sufix.
bitEncoder.Add(endOfFileFlag); //End of the LZW
bitEncoder.End();
//If the block size if greater than 255, divides into two.
if (bitEncoder.Length > 255)
{
var leftBuffer = new byte[bitEncoder.Length - 255];
bitEncoder.OutList.CopyTo(255, leftBuffer, 0, leftBuffer.Length);
bitEncoder.OutList.Clear();
bitEncoder.OutList.AddRange(leftBuffer);
internalStream.WriteByte((byte)leftBuffer.Length);
internalStream.Write(leftBuffer, 0, leftBuffer.Length);
}
else
{
internalStream.WriteByte((byte)(bitEncoder.Length));
internalStream.Write(bitEncoder.OutList.ToArray(), 0, bitEncoder.Length);
bitEncoder.OutList.Clear();
}
break;
}
#endregion
}
//For 3 weeks I forgot to add this little piece of sh*t, my gifs were always corrupted...
//Signals the end of the list of blocks.
internalStream.WriteByte(0);
}
