/// <summary>
/// Prüft, ob im Verzeichnis der Anwendung Dekomprimierungstabellen zu finden sind und
/// verwendet diese dann.
/// </summary>
/// <returns>Liste aller erfolgreich geladenen Tabellen.</returns>
public static int[] DynamicLoadTables()
{
// Reset
List <int> tables = new List <int>();
// Get the directory
DirectoryInfo tableDirectory = RunTimeLoader.RunTimePath;
// Check files
for (int i = 0; i++ < CodePages.Length;)
{
try
{
// Attach to file
FileInfo table = new FileInfo(Path.Combine(tableDirectory.FullName, string.Format("CodePage{0}.xht", i)));
// Load it
if (table.Exists)
{
// Process
LoadTable(i, HuffmanPairTable.Load(table.FullName));
// Remember
tables.Add(i);
}
}
catch
{
// Ignore any error
}
}
// Report
return(tables.ToArray());
}
/// <summary>
/// Liest die <i>Huffman</i> Tabellen aus den Ressourcen.
/// </summary>
static TextDecoder()
{
// Create binary representation helper
BinaryTables = new ushort[CodePages.Length][];
// Attach to self
Type me = typeof(TextDecoder);
// Load all
for (int i = CodePages.Length; i > 0; --i)
{
try
{
// Attach to resource
using (Stream stream = me.Assembly.GetManifestResourceStream(string.Format("{0}.CodePage{1}.xht", me.Namespace, i)))
{
// Just load
LoadTable(i, HuffmanPairTable.Load(stream));
}
}
catch
{
// Ignore any error - just do not decompress
}
}
// Check for overloads
DynamicLoadTables();
}
/// <summary>
/// Assoziiert eine Dekomprimierungstabelle.
/// </summary>
/// <param name="codepage">Die betroffene Komprimierungsart.</param>
/// <param name="table">Die zu verwendende Tabelle</param>
/// <exception cref="ArgumentNullException">Es wurde keine Tabelle angegeben.</exception>
/// <exception cref="ArgumentException">Die Komprimierungsart ist unzulässig.</exception>
public static void LoadTable(int codepage, HuffmanPairTable table)
{
// Validate
if (null == table)
{
throw new ArgumentNullException("table");
}
if ((codepage < 1) || (codepage > 2))
{
throw new ArgumentException(codepage.ToString(), "codepage");
}
// Try to compile the table
ushort[] compiled = table.CreateBinary().GetTable();
// Remember the full table information
CodePages[codepage - 1] = table;
// Remember the binary representation
BinaryTables[codepage - 1] = compiled;
}
/// <summary>
/// Assoziiert eine Dekomprimierungstabelle.
/// </summary>
/// <param name="codepage">Die betroffene Komprimierungsart.</param>
/// <param name="table">Die zu verwendende Tabelle</param>
/// <exception cref="ArgumentNullException">Es wurde keine Tabelle angegeben.</exception>
/// <exception cref="ArgumentException">Die Komprimierungsart ist unzulässig.</exception>
public static void LoadTable( int codepage, HuffmanPairTable table )
{
// Validate
if (null == table) throw new ArgumentNullException( "table" );
if ((codepage < 1) || (codepage > 2)) throw new ArgumentException( codepage.ToString(), "codepage" );
// Try to compile the table
ushort[] compiled = table.CreateBinary().GetTable();
// Remember the full table information
CodePages[codepage - 1] = table;
// Remember the binary representation
BinaryTables[codepage - 1] = compiled;
}
/// <summary>
/// Wandelt eine Texteingabedatei in eine interne Repräsentation um.
/// </summary>
/// <param name="path">Der volle Pfad zur Datei.</param>
private static void ProcessFile( string path )
{
// See if this is a table
bool isTable = (0 == string.Compare( Path.GetExtension( path ), ".xht", true ));
// The huffman pair table
HuffmanPairTable pairTable;
// Check mode
if (isTable)
{
// Load the table
pairTable = HuffmanPairTable.Load( path );
}
else
{
// Create the huffman pair table
pairTable = new HuffmanPairTable();
// Open the file for line wiese reading
using (StreamReader reader = new StreamReader( path, Encoding.GetEncoding( 1252 ) ))
{
// Read the format
string format = reader.ReadLine();
// Create the delegate
ProcessLineHandler processor = (ProcessLineHandler) Delegate.CreateDelegate( typeof( ProcessLineHandler ), typeof( Program ), format );
// Process all lines
for (string line; null != (line = reader.ReadLine()); )
{
// Process the line
processor( pairTable, line );
}
}
}
// Create the binary representation
TableCreator table = pairTable.CreateBinary();
// Core name
string targetName = Path.GetFileNameWithoutExtension( path );
// Report
Console.WriteLine( "{0} ({1} Bytes): Lookup={2} Linked={3} [{6} Patterns total] Dead={4} Unsupported={5}", targetName, table.GetTable().Length, table.DirectTables, table.LinkedTables, table.DeadEnds, table.CharacterNotSupported, table.LinkedItems );
// Load the table
uint[] encoderTable = table.CreateEncoderTable();
// See if we created the table
if (!isTable)
{
// Overall usage
double usage = 0.0;
// Process all
for (int i = 127 + 1; i-- > 0; )
{
// Attach to the table index
int index = i * (1 + 127 + 1) * 2;
// Overall weight
long weight = 0;
// Process all
for (int j = 1 + 127 + 1; j-- > 0; )
{
// Load items
uint width = encoderTable[index++];
uint pattern = encoderTable[index++];
// Check it
if (width > 0)
weight += ((long) 1) << (int) (32 - width);
}
// Get the private usage
double privUsage = weight * 1.0 / (((long) 1) << 32);
// Report
pairTable[(0 == i) ? HuffmanItem.StartOrEnd : (char) (i - 1 + 1)].FillFactor = privUsage;
// Sum up
usage += privUsage;
}
// Correct
usage /= (127 + 1);
// Report usage
pairTable.FillFactor = usage;
// Save XML representation
pairTable.Save( Path.ChangeExtension( path, ".xht" ) );
}
}
/// <summary>
/// Wertet eine Eingangszeile aus.
/// </summary>
/// <param name="table">Die Repräsentation der Tabelle zur Ablage als XML Datei.</param>
/// <param name="line">Die aktuelle Eingabezeile.</param>
private static void FormatCPP1( HuffmanPairTable table, string line )
{
// Remember
string originalLine = line;
// Prepare
line = line.Replace( "','", "COMMA" ).Replace( "'{'", "OPEN_BRACE" ).Replace( "'}'", "CLOSE_BRACE" );
// Split
string[] parts = line.Trim().Split( new char[] { '{', ',', '}' }, StringSplitOptions.RemoveEmptyEntries );
// Test hex number
string hex = parts[1].Trim();
if (!hex.StartsWith( "0x" ))
throw new ArgumentException( hex, "line" );
// Get all
char from = FromQuoted( parts[0].Trim(), "START" );
char to = FromQuoted( parts[3].Trim(), "STOP" );
uint pattern = uint.Parse( hex.Substring( 2 ), NumberStyles.HexNumber ), test = pattern;
int bits = int.Parse( parts[2].Trim() );
// Create helper
char[] sequence = new char[bits];
// Fill helper
for (int n = 0; n < bits; test <<= 1)
{
// Remember
sequence[n++] = (0 == (test & 0x80000000)) ? '0' : '1';
}
// Check for duplicates
if (null != table[from, to])
table[from].FindItem( to ).AddAlternateSequence( new string( sequence ) );
else
table[from, to] = new string( sequence );
}