public RemapStream(Stream baseStream, RemapSegment segment)
{
BaseStream = baseStream;
Segment = segment;
CurrentEntry = segment.Entries[0];
Length = segment.Length;
}
private static RemapSegment[] InitSegments(RemapHeader header, MapEntry[] mapEntries)
{
var segments = new RemapSegment[header.MapSegmentCount];
int entryIdx = 0;
for (int i = 0; i < header.MapSegmentCount; i++)
{
var seg = new RemapSegment();
seg.Entries.Add(mapEntries[entryIdx]);
seg.Offset = mapEntries[entryIdx].VirtualOffset;
mapEntries[entryIdx].Segment = seg;
entryIdx++;
while (entryIdx < mapEntries.Length &&
mapEntries[entryIdx - 1].VirtualOffsetEnd == mapEntries[entryIdx].VirtualOffset)
{
mapEntries[entryIdx].Segment = seg;
mapEntries[entryIdx - 1].Next = mapEntries[entryIdx];
seg.Entries.Add(mapEntries[entryIdx]);
entryIdx++;
}
seg.Length = seg.Entries[seg.Entries.Count - 1].VirtualOffsetEnd - seg.Entries[0].VirtualOffset;
segments[i] = seg;
}
return(segments);
}
public RemapStream(Stream baseStream, MapEntry[] entries, int segmentCount)
{
BaseStream = baseStream;
MapEntries = entries;
Segments = new RemapSegment[segmentCount];
int entryIdx = 0;
for (int i = 0; i < segmentCount; i++)
{
var seg = new RemapSegment();
seg.Entries.Add(MapEntries[entryIdx]);
seg.Offset = MapEntries[entryIdx].VirtualOffset;
MapEntries[entryIdx].Segment = seg;
entryIdx++;
while (entryIdx < MapEntries.Length &&
MapEntries[entryIdx - 1].VirtualOffsetEnd == MapEntries[entryIdx].VirtualOffset)
{
MapEntries[entryIdx].Segment = seg;
MapEntries[entryIdx - 1].Next = MapEntries[entryIdx];
seg.Entries.Add(MapEntries[entryIdx]);
entryIdx++;
}
seg.Length = seg.Entries[seg.Entries.Count - 1].VirtualOffsetEnd - seg.Entries[0].VirtualOffset;
Segments[i] = seg;
}
CurrentEntry = GetMapEntry(0);
UpdateBaseStreamPosition();
}
public Stream OpenStream(long offset, long size)
{
int segmentIdx = GetSegmentFromVirtualOffset(offset);
long segmentOffset = GetOffsetFromVirtualOffset(offset);
if (segmentIdx > Segments.Length)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
RemapSegment segment = Segments[GetSegmentFromVirtualOffset(offset)];
if (segmentOffset > segment.Length)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
Stream stream = new RemapStream(StreamSource.CreateStream(), segment);
return(new SubStream(stream, offset, size));
}
