diff --git a/level.py b/level.py
index f4d9b9b..b097020 100644
--- a/level.py
+++ b/level.py
@@ -331,6 +331,10 @@ class MCLevel(object):
 
         return blocktable
 
+    def fillBlocksIter(self, box, blockInfo, blocksToReplace=[]):
+        self.fillBlocks(box, blockInfo, blocksToReplace)
+        yield
+        
     def fillBlocks(self, box, blockInfo, blocksToReplace=[]):
 
         if box is None:
diff --git a/mclevel.py b/mclevel.py
index 213ae72..0e7a073 100644
--- a/mclevel.py
+++ b/mclevel.py
@@ -180,6 +180,7 @@ from infiniteworld import *
 from java import *
 from level import *
 from schematic import *
+from pocket import *
 
 import sys
 
@@ -192,6 +193,7 @@ import sys
 #    )
 #    
 
+class LoadingError(RuntimeError): pass
 
 def fromFile(filename, loadInfinite=True):
     ''' The preferred method for loading Minecraft levels of any type.
@@ -199,9 +201,6 @@ def fromFile(filename, loadInfinite=True):
     '''
     info(u"Identifying " + filename)
 
-    class LoadingError(RuntimeError): pass
-
-
     if not filename:
         raise IOError, "File not found: " + filename
     if not os.path.exists(filename):
@@ -213,6 +212,9 @@ def fromFile(filename, loadInfinite=True):
         info("Detected zipped Infdev level")
         return lev
 
+    if (PocketWorld._isLevel(filename)):
+        return PocketWorld(filename)
+
     if (MCInfdevOldLevel._isLevel(filename)):
         info(u"Detected Infdev level.dat")
         if (loadInfinite):
diff --git a/pocket.py b/pocket.py
new file mode 100644
index 0000000..6612dbf
--- /dev/null
+++ b/pocket.py
@@ -0,0 +1,409 @@
+from mclevelbase import *
+from pymclevel.level import FakeChunk
+import struct
+
+#values are usually little-endian, unlike Minecraft PC
+
+class PocketChunksFile(object):
+    holdFileOpen = False #if False, reopens and recloses the file on each access
+    SECTOR_BYTES = 4096
+    CHUNK_HEADER_SIZE = SECTOR_BYTES
+    
+    @property
+    def file(self):
+        openfile = lambda:file(self.path, "rb+")
+        if PocketChunksFile.holdFileOpen:
+            if self._file is None:
+                self._file = openfile()
+            return notclosing(self._file)
+        else:
+            return openfile()
+
+    def close(self):
+        if PocketChunksFile.holdFileOpen:
+            self._file.close()
+            self._file = None
+
+    def __init__(self, path):
+        self.path = path
+        self._file = None
+        if not os.path.exists(path):
+            file(path, "w").close()
+
+        with self.file as f:
+
+            filesize = os.path.getsize(path)
+            if filesize & 0xfff:
+                filesize = (filesize | 0xfff) + 1
+                f.truncate(filesize)
+
+            if filesize == 0:
+                filesize = self.SECTOR_BYTES
+                f.truncate(filesize)
+
+
+            f.seek(0)
+            offsetsData = f.read(self.SECTOR_BYTES)
+           
+            self.freeSectors = [True] * (filesize / self.SECTOR_BYTES)
+            self.freeSectors[0] = False
+
+            self.offsets = fromstring(offsetsData, dtype='<u4')
+            
+
+        needsRepair = False
+
+        for index, offset in enumerate(self.offsets):
+            sector = offset >> 8
+            count = offset & 0xff
+
+            for i in xrange(sector, sector + count):
+                if i >= len(self.freeSectors):
+                    #raise RegionMalformed, "Region file offset table points to sector {0} (past the end of the file)".format(i)
+                    print  "Region file offset table points to sector {0} (past the end of the file)".format(i)
+                    needsRepair = True
+                    break
+                if self.freeSectors[i] is False:
+                    debug("Double-allocated sector number %s (offset %s @ %s)", i, offset, index)
+                    needsRepair = True
+                self.freeSectors[i] = False
+
+        if needsRepair:
+            self.repair()
+
+        info("Found region file {file} with {used}/{total} sectors used and {chunks} chunks present".format(
+             file=os.path.basename(path), used=self.usedSectors, total=self.sectorCount, chunks=self.chunkCount))
+    
+    @property
+    def usedSectors(self): return len(self.freeSectors) - sum(self.freeSectors)
+    
+    @property
+    def sectorCount(self): return len(self.freeSectors)
+    
+    @property
+    def chunkCount(self): return sum(self.offsets > 0)
+    
+    def repair(self):
+        pass
+#        lostAndFound = {}
+#        _freeSectors = [True] * len(self.freeSectors)
+#        _freeSectors[0] = _freeSectors[1] = False
+#        deleted = 0
+#        recovered = 0
+#        info("Beginning repairs on {file} ({chunks} chunks)".format(file=os.path.basename(self.path), chunks=sum(self.offsets > 0)))
+#        rx, rz = self.regionCoords
+#        for index, offset in enumerate(self.offsets):
+#            if offset:
+#                cx = index & 0x1f
+#                cz = index >> 5
+#                cx += rx << 5
+#                cz += rz << 5
+#                sectorStart = offset >> 8
+#                sectorCount = offset & 0xff
+#                try:
+#
+#                    if sectorStart + sectorCount > len(self.freeSectors):
+#                        raise RegionMalformed, "Offset {start}:{end} ({offset}) at index {index} pointed outside of the file".format(
+#                            start=sectorStart, end=sectorStart + sectorCount, index=index, offset=offset)
+#
+#                    compressedData = self._readChunk(cx, cz)
+#                    if compressedData is None:
+#                        raise RegionMalformed, "Failed to read chunk data for {0}".format((cx, cz))
+#
+#                    format, data = self.decompressSectors(compressedData)
+#                    chunkTag = nbt.load(buf=data)
+#                    lev = chunkTag["Level"]
+#                    xPos = lev["xPos"].value
+#                    zPos = lev["zPos"].value
+#                    overlaps = False
+#
+#                    for i in xrange(sectorStart, sectorStart + sectorCount):
+#                        if _freeSectors[i] is False:
+#                            overlaps = True
+#                        _freeSectors[i] = False
+#
+#
+#                    if xPos != cx or zPos != cz or overlaps:
+#                        lostAndFound[xPos, zPos] = (format, compressedData)
+#
+#                        if (xPos, zPos) != (cx, cz):
+#                            raise RegionMalformed, "Chunk {found} was found in the slot reserved for {expected}".format(found=(xPos, zPos), expected=(cx, cz))
+#                        else:
+#                            raise RegionMalformed, "Chunk {found} (in slot {expected}) has overlapping sectors with another chunk!".format(found=(xPos, zPos), expected=(cx, cz))
+#
+#
+#
+#                except Exception, e:
+#                    info("Unexpected chunk data at sector {sector} ({exc})".format(sector=sectorStart, exc=e))
+#                    self.setOffset(cx, cz, 0)
+#                    deleted += 1
+#
+#        for cPos, (format, foundData) in lostAndFound.iteritems():
+#            cx, cz = cPos
+#            if self.getOffset(cx, cz) == 0:
+#                info("Found chunk {found} and its slot is empty, recovering it".format(found=cPos))
+#                self._saveChunk(cx, cz, foundData[5:], format)
+#                recovered += 1
+#
+#        info("Repair complete. Removed {0} chunks, recovered {1} chunks, net {2}".format(deleted, recovered, recovered - deleted))
+#
+#    def extractAllChunks(self, folder):
+#        if not os.path.exists(folder):
+#            os.mkdir(folder)
+#        for cx, cz in itertools.product(range(32), range(32)):
+#            sectors = self._readChunk(cx, cz)
+#            if sectors is not None:
+#                format, compressedData = self.unpackSectors(sectors)
+#                data = self._decompressSectors(format, compressedData)
+#                chunkTag = nbt.load(buf=data)
+#                lev = chunkTag["Level"]
+#                xPos = lev["xPos"].value
+#                zPos = lev["zPos"].value
+#                gzdata = InfdevChunk.compressTagGzip(chunkTag)
+#                #print chunkTag.pretty_string()
+#
+#                with file(os.path.join(folder, "c.{0}.{1}.dat".format(base36(xPos), base36(zPos))), "wb") as f:
+#                    f.write(gzdata)
+
+    def _readChunk(self, cx, cz):
+        cx &= 0x1f
+        cz &= 0x1f
+        offset = self.getOffset(cx, cz)
+        if offset == 0: return None
+
+        sectorStart = offset >> 8
+        numSectors = offset & 0xff
+        if numSectors == 0: return None
+
+        if sectorStart + numSectors > len(self.freeSectors):
+            return None
+
+        with self.file as f:
+            f.seek(sectorStart * self.SECTOR_BYTES)
+            data = f.read(numSectors * self.SECTOR_BYTES)
+        assert(len(data) > 0)
+        debug("REGION LOAD %s,%s sector %s", cx, cz, sectorStart)
+        return data
+
+    def loadChunk(self, cx, cz, world):
+        data = self._readChunk(cx, cz)
+        if data is None: raise ChunkNotPresent, (cx, cz, self)
+        
+        chunk = PocketChunk(cx, cz, data[4:], world)
+        return chunk
+
+
+    def saveChunk(self, chunk):
+        cx, cz = chunk.chunkPosition
+        
+        cx &= 0x1f
+        cz &= 0x1f
+        offset = self.getOffset(cx, cz)
+        sectorNumber = offset >> 8
+        sectorsAllocated = offset & 0xff
+
+        data = chunk._savedData()
+        
+        sectorsNeeded = (len(data) + self.CHUNK_HEADER_SIZE) / self.SECTOR_BYTES + 1;
+        if sectorsNeeded >= 256: return
+
+        if (sectorNumber != 0 and sectorsAllocated >= sectorsNeeded):
+            debug("REGION SAVE {0},{1} rewriting {2}b".format(cx, cz, len(data)))
+            self.writeSector(sectorNumber, data, format)
+        else:
+            # we need to allocate new sectors
+
+            # mark the sectors previously used for this chunk as free 
+            for i in xrange(sectorNumber, sectorNumber + sectorsAllocated):
+                self.freeSectors[i] = True
+
+            runLength = 0
+            try:
+                runStart = self.freeSectors.index(True)
+
+                for i in range(runStart, len(self.freeSectors)):
+                    if runLength:
+                        if self.freeSectors[i]:
+                            runLength += 1
+                        else:
+                            runLength = 0
+                    elif self.freeSectors[i]:
+                        runStart = i
+                        runLength = 1
+
+                    if runLength >= sectorsNeeded:
+                        break
+            except ValueError:
+                pass
+
+            # we found a free space large enough
+            if runLength >= sectorsNeeded:
+                debug("REGION SAVE {0},{1}, reusing {2}b".format(cx, cz, len(data)))
+                sectorNumber = runStart
+                self.setOffset(cx, cz, sectorNumber << 8 | sectorsNeeded)
+                self.writeSector(sectorNumber, data, format)
+                self.freeSectors[sectorNumber:sectorNumber + sectorsNeeded] = [False] * sectorsNeeded
+
+            else:
+                # no free space large enough found -- we need to grow the
+                # file
+
+                debug("REGION SAVE {0},{1}, growing by {2}b".format(cx, cz, len(data)))
+
+                with self.file as f:
+                    f.seek(0, 2)
+                    filesize = f.tell()
+
+                    sectorNumber = len(self.freeSectors)
+
+                    assert sectorNumber * self.SECTOR_BYTES == filesize
+
+                    filesize += sectorsNeeded * self.SECTOR_BYTES
+                    f.truncate(filesize)
+
+                self.freeSectors += [False] * sectorsNeeded
+
+                self.setOffset(cx, cz, sectorNumber << 8 | sectorsNeeded)
+                self.writeSector(sectorNumber, data, format)
+
+
+    def writeSector(self, sectorNumber, data, format):
+        with self.file as f:
+            debug("REGION: Writing sector {0}".format(sectorNumber))
+
+            f.seek(sectorNumber * self.SECTOR_BYTES)
+            f.write(struct.pack("<I", len(data)));# // chunk length
+            f.write(data);# // chunk data
+            #f.flush()
+
+    def containsChunk(self, cx,cz):
+        return self.getOffset(cx,cz) != 0
+        
+    def getOffset(self, cx, cz):
+        cx &= 0x1f;
+        cz &= 0x1f
+        return self.offsets[cx + cz * 32]
+
+    def setOffset(self, cx, cz, offset):
+        cx &= 0x1f;
+        cz &= 0x1f
+        self.offsets[cx + cz * 32] = offset
+        with self.file as f:
+            f.seek(0)
+            f.write(self.offsets.tostring())
+    
+    def chunkCoords(self):
+        indexes = (i for (i, offset) in enumerate(self.offsets) if offset)
+        coords = ((i % 32, i // 32) for i in indexes)
+        return coords
+        
+from infiniteworld import InfdevChunk, ChunkedLevelMixin
+
+class PocketWorld(ChunkedLevelMixin, MCLevel):
+    Height = 128
+    Length = 512
+    Width = 512
+    
+    isInfinite = True # Wrong. isInfinite actually means 'isChunked' and should be changed
+    loadedChunks = None
+    
+    @property
+    def allChunks(self):
+        return list(self.chunkFile.chunkCoords())
+        
+    def __init__(self, filename):
+        if not os.path.isdir(filename):
+            filename = os.path.dirname(filename)
+        self.filename = filename
+        
+        self.chunkFile = PocketChunksFile(os.path.join(filename, "chunks.dat"))
+        self.loadedChunks = {}
+        
+    def getChunk(self, cx, cz):
+        c = self.loadedChunks.get( (cx,cz) )
+        if c is None:
+            c = self.chunkFile.loadChunk(cx, cz, self)
+            self.loadedChunks[cx,cz] = c
+        return c
+    
+    @classmethod
+    def _isLevel(cls, filename):
+        clp = ("chunks.dat", "level.dat", "player.dat")
+        
+        if not os.path.isdir(filename): 
+            f = os.path.basename(filename)
+            if f not in clp: return False
+            filename = os.path.dirname(filename)
+        
+        return all([os.path.exists(os.path.join(filename, f)) for f in clp])    
+        
+    def saveInPlace(self):
+        for chunk in self.loadedChunks.itervalues():
+            self.chunkFile.saveChunk(chunk)
+    
+    def containsChunk(self, cx, cz):
+        if cx>31 or cz>31 or cx < 0 or cz < 0: return False
+        return self.chunkFile.getOffset(cx,cz) != 0
+        
+class PocketChunk(InfdevChunk):
+    Blocks = Data = SkyLight = BlockLight = None
+    
+    HeightMap = FakeChunk.HeightMap
+    Entities = TileEntities = property(lambda self: TAG_List())
+    
+    
+    def __init__(self, cx, cz, data, world):
+        self.chunkPosition = (cx,cz)
+        self.world = world
+        data = fromstring(data, dtype='uint8')
+        
+        self.Blocks, data = data[:32768], data[32768:]
+        self.Data, data = data[:16384], data[16384:]
+        self.SkyLight, data = data[:16384], data[16384:]
+        self.BlockLight = data[:16384]
+        
+        self.unpackChunkData()
+        self.shapeChunkData()
+    
+    def decompress(self): pass
+    def compress(self): pass
+    
+    def unpackChunkData(self):
+        for key in ('SkyLight', 'BlockLight', 'Data'):
+            dataArray = getattr(self, key)
+            dataArray.shape = (16, 16, 64)
+            s = dataArray.shape
+            #assert s[2] == self.world.Height / 2;
+            #unpackedData = insert(dataArray[...,newaxis], 0, 0, 3)  
+
+            unpackedData = zeros((s[0], s[1], s[2] * 2), dtype='uint8')
+
+            unpackedData[:, :, ::2] = dataArray
+            unpackedData[:, :, ::2] &= 0xf
+            unpackedData[:, :, 1::2] = dataArray
+            unpackedData[:, :, 1::2] >>= 4
+            setattr(self, key, unpackedData)
+            
+    def shapeChunkData(self):
+        chunkSize = 16
+        self.Blocks.shape = (chunkSize, chunkSize, self.world.Height)
+        self.SkyLight.shape = (chunkSize, chunkSize, self.world.Height)
+        self.BlockLight.shape = (chunkSize, chunkSize, self.world.Height)
+        self.Data.shape = (chunkSize, chunkSize, self.world.Height)
+        
+    def _savedData(self):
+        def packData(dataArray):
+            assert dataArray.shape[2] == self.world.Height;
+
+            data = dataArray.reshape(16, 16, self.world.Height / 2, 2)
+            data[..., 1] <<= 4
+            data[..., 1] |= data[..., 0]
+            return array(data[:, :, :, 1])
+
+            
+        return "".join([self.Blocks.tostring(), 
+                       packData(self.Data).tostring(),
+                       packData(self.SkyLight).tostring(),
+                       packData(self.BlockLight).tostring(),
+                       ])
+        
\ No newline at end of file
diff --git a/testfiles/PocketWorld/chunks.dat b/testfiles/PocketWorld/chunks.dat
new file mode 100644
index 0000000..3e7c945
Binary files /dev/null and b/testfiles/PocketWorld/chunks.dat differ
diff --git a/testfiles/PocketWorld/level.dat b/testfiles/PocketWorld/level.dat
new file mode 100644
index 0000000..f73c1cc
Binary files /dev/null and b/testfiles/PocketWorld/level.dat differ
diff --git a/testfiles/PocketWorld/player.dat b/testfiles/PocketWorld/player.dat
new file mode 100644
index 0000000..59e6e2d
Binary files /dev/null and b/testfiles/PocketWorld/player.dat differ
diff --git a/tests.py b/tests.py
index 296e5c2..262d730 100644
--- a/tests.py
+++ b/tests.py
@@ -246,6 +246,20 @@ class TestSchematics(unittest.TestCase):
         info("TileEntities: ", invFile.TileEntities)
         #raise SystemExit;
 
+class TestPocket(unittest.TestCase):
+    def setUp(self):
+        #self.alphaLevel = TempLevel("Dojo_64_64_128.dat")
+        self.level = TempLevel("PocketWorld")
+        self.alphalevel = TempLevel("PyTestWorld")
+        
+    def testPocket(self):
+        level = self.level.level
+        alphalevel = self.alphalevel.level
+        print "Chunk count", len(level.allChunks)
+        level.copyBlocksFrom(alphalevel, BoundingBox((0, 0, 0), (64, 64, 64,)), (0, 0, 0))
+        #assert((level.Blocks[0:64, 0:64, 0:64] == alphalevel.Blocks[0:64, 0:64, 0:64]).all())
+        
+        
 class TestServerGen(unittest.TestCase):
     def setUp(self):
         #self.alphaLevel = TempLevel("Dojo_64_64_128.dat")