/// <summary>
/// Dekomprimiert eine Zeichenkette.
/// </summary>
/// <param name="bytes">Feld mit den dekomprimierten Werten.</param>
/// <param name="index">Laufende Nummer des ersten zu dekomprimierenden Wertes.</param>
/// <param name="count">Die Anzahl der zur Dekomprimierung zu verwenden Werte.</param>
/// <returns>Die dekomprimierte Zeichenketten - bei Fehlern wird ein <i>...</i> angehängt.</returns>
/// <exception cref="ArgumentException">Mindestens ein Parameter ist unzulässig.</exception>
public override string GetString(byte[] bytes, int index, int count)
{
// Validate
if (count < 1)
{
return(string.Empty);
}
// Get the table
ushort[] table = null;
if (1 == bytes[index])
{
table = BinaryTables[0];
}
else if (2 == bytes[index])
{
table = BinaryTables[1];
}
// Not table
if (null == table)
{
return(Section.DefaultEncoding.GetString(bytes, index, count));
}
// Advance index
++index;
--count;
// Nothing in it
if (count < 1)
{
return(string.Empty);
}
// Remember
int initialIndex = index, initialCount = count;
// Constructor
List <byte> builder = new List <byte>();
// Set current processing index
ushort tableIndex = table[0];
// Current index shift
int indexShift = 0;
// Previous pattern and width
uint?previous = null;
// Last checkpoint
int lastCharPosition = 0;
// Process
for (; ;)
{
// Check for regular stop
if (0 == tableIndex)
{
// Load the initial check pattern
byte check = (byte)(0xff >> indexShift);
// All bytes must be zero
for (; count-- > 0; check = 0xff)
{
if (0 != (bytes[index++] & check))
{
break;
}
}
// Found something bad
if (count >= 0)
{
break;
}
// Load result
string decompressed = Encoding.UTF8.GetString(builder.ToArray());
// Load client
EventHandler <DecodingReportArgs> successHandler = OnSuccess;
// Report
if (null != successHandler)
{
// Create full data
byte[] compressed = new byte[initialCount];
// Fill it
Array.Copy(bytes, initialIndex, compressed, 0, compressed.Length);
// Create argument list
DecodingReportArgs args = new DecodingReportArgs();
// Fill it
args.CodePage = (table == BinaryTables[0]) ? 1 : 2;
args.Uncompressed = decompressed;
args.CompressedData = compressed;
// Report
successHandler(this, args);
}
// Report
return(decompressed);
}
// Unexpected end of input
if (count < 1)
{
break;
}
// Check for leaf
if (tableIndex <= 127)
{
// At this position
lastCharPosition = 8 * (index - initialIndex) + indexShift;
// Append
builder.Add((byte)('\x0001' + tableIndex - 1));
// Restart
tableIndex = table[tableIndex];
}
// In error
if (tableIndex == TableCreator.ErrorIndicator)
{
break;
}
// Check for escape mode
bool inEscape = (tableIndex == TableCreator.EscapeIndicator);
// Get the number of bits to process
ushort bitWidth = inEscape ? (ushort)8 : table[tableIndex++];
// Check limitation
if (bitWidth > 24)
{
break;
}
// Not possible
if (bitWidth > 8 * count)
{
break;
}
// The pattern
uint pattern;
// Quick load pattern
if (previous.HasValue)
{
// Use
pattern = previous.Value;
}
else
{
// The pattern
pattern = bytes[index + 0];
// Append
pattern <<= 8;
if (count > 1)
{
pattern |= bytes[index + 1];
}
// Append
pattern <<= 8;
if (count > 2)
{
pattern |= bytes[index + 2];
}
// Append
pattern <<= 8;
if (count > 3)
{
pattern |= bytes[index + 3];
}
// Remember
previous = pattern;
}
// Correct it
pattern <<= indexShift;
// Adjust shift
indexShift += bitWidth;
// Adjust index
if (indexShift >= 8)
{
// Shift bytes
int bytesEaten = indexShift / 8;
// Adjust all
index += bytesEaten;
count -= bytesEaten;
indexShift %= 8;
// Clear cache
previous = null;
}
// Check for escape mode
if (inEscape)
{
// At this position
lastCharPosition = 8 * (index - initialIndex) + indexShift;
// Get character
pattern >>= 24;
// See if this is it
if (pattern < 128)
{
if (0 == pattern)
{
tableIndex = 0;
}
else
{
tableIndex = (ushort)(1 + (pattern - 1));
}
}
else
{
builder.Add((byte)pattern);
}
// Next
continue;
}
// Get the first link position
ushort linkIndex = table[tableIndex++];
// Translate the pattern
uint patternIndex = pattern >> (32 - bitWidth);
// Check mode
if (linkIndex == TableCreator.EndIndicator)
{
// Attach to the entry
tableIndex = table[tableIndex + patternIndex];
}
else
{
// Try to find
do
{
// Test pattern - upper half
uint test = table[linkIndex - 4];
// Test pattern - lower half
test <<= 16;
test |= table[linkIndex - 3];
// Next table
tableIndex = table[linkIndex - 2];
// Did it
if (test == patternIndex)
{
break;
}
// Advance
linkIndex = table[linkIndex - 1];
}while (linkIndex != TableCreator.EndIndicator);
// In error
if (linkIndex == TableCreator.EndIndicator)
{
break;
}
}
}
// Load client
EventHandler <DecodingFailureArgs> handler = OnFailure;
// Report
if (null != handler)
{
// Create full data
byte[] compressed = new byte[initialCount];
// Fill it
Array.Copy(bytes, initialIndex, compressed, 0, compressed.Length);
// Create argument list
DecodingFailureArgs args = new DecodingFailureArgs();
// Fill it
args.Uncompressed = Encoding.UTF8.GetString(builder.ToArray());
args.CodePage = (table == BinaryTables[0]) ? 1 : 2;
args.BitPosition = lastCharPosition;
args.CompressedData = compressed;
// Report
handler(this, args);
}
// Report
return(Encoding.UTF8.GetString(builder.ToArray()) + "....");
}
/// <summary>
/// Dekomprimiert eine Zeichenkette.
/// </summary>
/// <param name="bytes">Feld mit den dekomprimierten Werten.</param>
/// <param name="index">Laufende Nummer des ersten zu dekomprimierenden Wertes.</param>
/// <param name="count">Die Anzahl der zur Dekomprimierung zu verwenden Werte.</param>
/// <returns>Die dekomprimierte Zeichenketten - bei Fehlern wird ein <i>...</i> angehängt.</returns>
/// <exception cref="ArgumentException">Mindestens ein Parameter ist unzulässig.</exception>
public override string GetString( byte[] bytes, int index, int count )
{
// Validate
if (count < 1)
return string.Empty;
// Get the table
ushort[] table = null;
if (1 == bytes[index])
table = BinaryTables[0];
else if (2 == bytes[index])
table = BinaryTables[1];
// Not table
if (null == table)
return Section.DefaultEncoding.GetString( bytes, index, count );
// Advance index
++index;
--count;
// Nothing in it
if (count < 1)
return string.Empty;
// Remember
int initialIndex = index, initialCount = count;
// Constructor
List<byte> builder = new List<byte>();
// Set current processing index
ushort tableIndex = table[0];
// Current index shift
int indexShift = 0;
// Previous pattern and width
uint? previous = null;
// Last checkpoint
int lastCharPosition = 0;
// Process
for (; ; )
{
// Check for regular stop
if (0 == tableIndex)
{
// Load the initial check pattern
byte check = (byte) (0xff >> indexShift);
// All bytes must be zero
for (; count-- > 0; check = 0xff)
if (0 != (bytes[index++] & check))
break;
// Found something bad
if (count >= 0)
break;
// Load result
string decompressed = Encoding.UTF8.GetString( builder.ToArray() );
// Load client
EventHandler<DecodingReportArgs> successHandler = OnSuccess;
// Report
if (null != successHandler)
{
// Create full data
byte[] compressed = new byte[initialCount];
// Fill it
Array.Copy( bytes, initialIndex, compressed, 0, compressed.Length );
// Create argument list
DecodingReportArgs args = new DecodingReportArgs();
// Fill it
args.CodePage = (table == BinaryTables[0]) ? 1 : 2;
args.Uncompressed = decompressed;
args.CompressedData = compressed;
// Report
successHandler( this, args );
}
// Report
return decompressed;
}
// Unexpected end of input
if (count < 1)
break;
// Check for leaf
if (tableIndex <= 127)
{
// At this position
lastCharPosition = 8 * (index - initialIndex) + indexShift;
// Append
builder.Add( (byte) ('\x0001' + tableIndex - 1) );
// Restart
tableIndex = table[tableIndex];
}
// In error
if (tableIndex == TableCreator.ErrorIndicator)
break;
// Check for escape mode
bool inEscape = (tableIndex == TableCreator.EscapeIndicator);
// Get the number of bits to process
ushort bitWidth = inEscape ? (ushort) 8 : table[tableIndex++];
// Check limitation
if (bitWidth > 24)
break;
// Not possible
if (bitWidth > 8 * count)
break;
// The pattern
uint pattern;
// Quick load pattern
if (previous.HasValue)
{
// Use
pattern = previous.Value;
}
else
{
// The pattern
pattern = bytes[index + 0];
// Append
pattern <<= 8;
if (count > 1)
pattern |= bytes[index + 1];
// Append
pattern <<= 8;
if (count > 2)
pattern |= bytes[index + 2];
// Append
pattern <<= 8;
if (count > 3)
pattern |= bytes[index + 3];
// Remember
previous = pattern;
}
// Correct it
pattern <<= indexShift;
// Adjust shift
indexShift += bitWidth;
// Adjust index
if (indexShift >= 8)
{
// Shift bytes
int bytesEaten = indexShift / 8;
// Adjust all
index += bytesEaten;
count -= bytesEaten;
indexShift %= 8;
// Clear cache
previous = null;
}
// Check for escape mode
if (inEscape)
{
// At this position
lastCharPosition = 8 * (index - initialIndex) + indexShift;
// Get character
pattern >>= 24;
// See if this is it
if (pattern < 128)
if (0 == pattern)
tableIndex = 0;
else
tableIndex = (ushort) (1 + (pattern - 1));
else
builder.Add( (byte) pattern );
// Next
continue;
}
// Get the first link position
ushort linkIndex = table[tableIndex++];
// Translate the pattern
uint patternIndex = pattern >> (32 - bitWidth);
// Check mode
if (linkIndex == TableCreator.EndIndicator)
{
// Attach to the entry
tableIndex = table[tableIndex + patternIndex];
}
else
{
// Try to find
do
{
// Test pattern - upper half
uint test = table[linkIndex - 4];
// Test pattern - lower half
test <<= 16;
test |= table[linkIndex - 3];
// Next table
tableIndex = table[linkIndex - 2];
// Did it
if (test == patternIndex)
break;
// Advance
linkIndex = table[linkIndex - 1];
}
while (linkIndex != TableCreator.EndIndicator);
// In error
if (linkIndex == TableCreator.EndIndicator)
break;
}
}
// Load client
EventHandler<DecodingFailureArgs> handler = OnFailure;
// Report
if (null != handler)
{
// Create full data
byte[] compressed = new byte[initialCount];
// Fill it
Array.Copy( bytes, initialIndex, compressed, 0, compressed.Length );
// Create argument list
DecodingFailureArgs args = new DecodingFailureArgs();
// Fill it
args.Uncompressed = Encoding.UTF8.GetString( builder.ToArray() );
args.CodePage = (table == BinaryTables[0]) ? 1 : 2;
args.BitPosition = lastCharPosition;
args.CompressedData = compressed;
// Report
handler( this, args );
}
// Report
return Encoding.UTF8.GetString( builder.ToArray() ) + "....";
}
