public static bool DecodeFile(string InputPath, string OutputPath)
{
bool OpenSuccessfully = true;
BinaryWriter OutputFile = null;
try
{
SourceFile = new BinaryReader(File.OpenRead(InputPath));
OutputFile = new BinaryWriter(File.Create(OutputPath));
}
catch
{
OpenSuccessfully = false;
}
if (OpenSuccessfully)
{
AdaptiveHuffmanTree DecodingModel = new AdaptiveHuffmanTree();
DecodingModel.CreateModel();
DecodingModel.NotEnoughCodeEvent += new AdaptiveHuffmanTree.NotEnoughCodeEventDelegate(OnNotEnoughCodeEvent);
bool FinishFlag = false;
Byte? Symbol = 0;
string Code = "";
//убираем расширение
do
{
ProgressEvent();
}while (SourceFile.ReadChar() != '.');
ProgressEvent();
Code = AdaptiveHuffmanTree.ToBinaryString(SourceFile.ReadByte());
while (!FinishFlag)
{
Symbol = DecodingModel.Decode(ref Code);
if (Symbol == null)
{
FinishFlag = true;
}
if (!FinishFlag)
{
OutputFile.Write((Byte)Symbol);
}
}
}
SourceFile.Close();
OutputFile.Close();
return(OpenSuccessfully);
}
public static bool EncodeFile(string InputPath, string OutputPath)
{
bool OpenSuccessfully = true;
BinaryWriter OutputFile = null;
try
{
SourceFile = new BinaryReader(File.OpenRead(InputPath));
OutputFile = new BinaryWriter(File.Create(OutputPath));
}
catch
{
OpenSuccessfully = false;
}
if (OpenSuccessfully)
{
AdaptiveHuffmanTree EncodingModel = new AdaptiveHuffmanTree();
EncodingModel.CreateModel();
bool EndOfFile = false;
Byte Symbol = 0;
string Code;
string Buffer = "";
//запись расширения исходного файла
char[] CharTypeBuffer;
FileInfo Finfo = new FileInfo(InputPath);
CharTypeBuffer = (Finfo.Extension.Substring(1, Finfo.Extension.Length - 1) + ".").ToCharArray();
OutputFile.Write(CharTypeBuffer);
while (!EndOfFile)
{
ProgressEvent();
try
{
Symbol = SourceFile.ReadByte();
}
catch
{
EndOfFile = true;
}
if (!EndOfFile)
{
Code = EncodingModel.Encode(Symbol);
}
else
{
Code = EncodingModel.Encode(null);
}
Code = Buffer + Code;
Buffer = Code.Substring(Code.Length - (Code.Length % 8), (Code.Length) - (Code.Length - (Code.Length % 8)));
Code = Code.Remove(Code.Length - (Code.Length % 8), (Code.Length) - (Code.Length - (Code.Length % 8)));
while (Code != "")
{
OutputFile.Write(AdaptiveHuffmanTree.ToByte(Code.Substring(0, 8)));
Code = Code.Remove(0, 8);
}
if (EndOfFile)
{
while (Buffer.Length != 8)
{
Buffer += "0";
}
OutputFile.Write(AdaptiveHuffmanTree.ToByte(Buffer));
}
}
SourceFile.Close();
OutputFile.Close();
}
return(OpenSuccessfully);
}