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 InitializeLinkedFileInStream(file, buffersize, StartSeek=0):
result = LinkedFile(buffersize, StartSeek)
result.fromfile = file
result.setHeader()
result.buffers = BufferFile.InitializeBufferFileInStream(
file, buffersize + BUFFEROVERHEAD, StartSeek + result.headersize)
return result
def InitializeInStream(fromfile,
KeyLength,
NodeSize,
CultureId=INVARIANTCULTUREID,
StartSeek=0):
result = BplusTreeLong(fromfile, NodeSize, KeyLength, StartSeek, CultureId)
result.setHeader()
result.buffers = BufferFile.InitializeBufferFileInStream(
fromfile, result.buffersize, StartSeek + result.headersize)
return result