public void Visit(LzCompressed lz, byte data)
{
var start = index;
(int runLength, int runOffset) = LZRun.ReadCompressedToken(buffer, ref start);
Result = $"{runLength}:{runOffset}";
}
public void Visit(LzCompressed lz, byte data)
{
if (!CurrentText.EndsWith(" "))
{
return;
}
var sections = CurrentText.Trim().Split(":");
if (sections.Length != 2)
{
return;
}
if (!int.TryParse(sections[0], out int runLength))
{
return;
}
if (!int.TryParse(sections[1], out int runOffset))
{
return;
}
Result = true;
if (runLength < 3 || runLength > 18)
{
ErrorText = "Run Length must be > 2 and < 19";
return;
}
else if (runOffset < 1 || runOffset > 0x1000)
{
ErrorText = "Run Offset must be > 0 and <= 4096";
return;
}
var result = LZRun.CompressedToken((byte)runLength, (short)runOffset);
var previousValue = Model.ReadMultiByteValue(memoryLocation, 2);
CurrentChange.ChangeData(Model, memoryLocation, result[0]);
CurrentChange.ChangeData(Model, memoryLocation + 1, result[1]);
var run = (LZRun)Model.GetNextRun(memoryLocation);
int runIndex = memoryLocation - run.Start;
if (!TryFixupLzRun(ref run, runIndex + 2))
{
Model.WriteMultiByteValue(memoryLocation, 2, CurrentChange, previousValue);
ErrorText = $"Could not write {runLength}:{runOffset} without making the compressed data invalid.";
}
else
{
NewDataIndex = run.Start + runIndex + 2;
}
}
private void UpdateCache(IDisposable scope, IReadOnlyList <byte> data)
{
previousScope = scope;
cache = new IDataFormat[Length];
int start = Start;
var cacheIndex = 4;
var decompressedLength = ReadHeader(data, ref start);
cache[0] = LzMagicIdentifier.Instance;
cache[1] = new Integer(Start + 1, 0, decompressedLength, 3);
cache[2] = new Integer(Start + 1, 1, decompressedLength, 3);
cache[3] = new Integer(Start + 1, 2, decompressedLength, 3);
while (cacheIndex < cache.Length)
{
cache[cacheIndex] = LzGroupHeader.Instance;
var bitfield = data[start];
cacheIndex++;
start++;
for (int i = 0; i < 8 && cacheIndex < cache.Length; i++)
{
if (IsNextTokenCompressed(ref bitfield))
{
if (cacheIndex + 2 > cache.Length)
{
cache[cacheIndex] = LzUncompressed.Instance;
cacheIndex++;
}
else
{
var(runLength, runOffset) = ReadCompressedToken(data, ref start);
cache[cacheIndex + 0] = new LzCompressed(start - 2, 0, runLength, runOffset);
cache[cacheIndex + 1] = new LzCompressed(start - 2, 1, runLength, runOffset);
cacheIndex += 2;
}
}
else
{
cache[cacheIndex] = LzUncompressed.Instance;
cacheIndex++;
start++;
}
}
}
}
public void Visit(LzCompressed lz, byte data) => buffer.WriteMultiByteValue(index, 2, currentChange, 0xFF);
public void Visit(LzCompressed lz, byte data)
{
}