def testBufferFile():
print "testing buffer file"
buffersize = 17
writesize = 10
mstream = newFile("pyBufferFile.dat")
offset = 55
bf = BufferFile.InitializeBufferFileInStream(mstream, buffersize, offset)
testdata = "sample data off the top of my head " * 1000
position = 0
lt = len(testdata)
for i in range(0, lt, writesize):
chunk = testdata[i:i + writesize]
bf.setBuffer(position, chunk)
position += 1
#print position,
lasti = i
#position = 0
print
bf = BufferFile.SetupFromExistingStream(mstream, offset)
#for i in range(0, lt, writesize):
for i in range(lasti, -1, -writesize):
position -= 1
chunksize = min(writesize, lt - i)
chunk = bf.getBuffer(position, chunksize)
#position += 1
#print position,
if chunk != testdata[i:i + writesize]:
raise ValueError, "chunks don't match %s!=%s" % (
repr(chunk), repr(testdata[i:i + writesize]))
print
def SetupFromExistingStream(file, StartSeek=0):
result = LinkedFile(100, StartSeek)
result.buffers = BufferFile.SetupFromExistingStream(
file, StartSeek + result.headersize)
result.fromfile = file
result.readHeader()
return result
def SetupFromExistingStream(fromfile, StartSeek=0):
result = BplusTreeLong(fromfile, 33, 33, StartSeek)
result.readHeader()
result.buffers = BufferFile.SetupFromExistingStream(
fromfile, StartSeek + result.headersize)
if (result.buffers.buffersize != result.buffersize):
raise BplusTreeException, "inner and outer buffer sizes should match " + repr(
(result.buffers.buffersize, result.buffersize))
if result.rootSeek != NULLBUFFERNUMBER:
result.root = BplusNode(result, None, None, True)
result.root.LoadFromBuffer(result.rootSeek)
return result