2009-09-11 | Paul Boddie | file changeset files shortlog | Added a Pyrex implementation of the vint function. |
paul@37 | 1 | #!/usr/bin/env python |
paul@37 | 2 | |
paul@37 | 3 | cdef extern from "Python.h": |
paul@37 | 4 | object PyString_FromStringAndSize(char *, int) |
paul@37 | 5 | |
paul@37 | 6 | def vint(int number): |
paul@37 | 7 | |
paul@37 | 8 | cdef char bytes[40] # NOTE: Arbitrary limit. |
paul@37 | 9 | cdef int lsd, i |
paul@37 | 10 | |
paul@37 | 11 | i = 0 |
paul@37 | 12 | while number != 0: |
paul@37 | 13 | lsd = number & 127 |
paul@37 | 14 | number = number >> 7 |
paul@37 | 15 | if number != 0: |
paul@37 | 16 | lsd = lsd | 128 |
paul@37 | 17 | bytes[i] = lsd |
paul@37 | 18 | i = i + 1 |
paul@37 | 19 | |
paul@37 | 20 | s = PyString_FromStringAndSize(bytes, i) |
paul@37 | 21 | return s |
paul@37 | 22 | |
paul@37 | 23 | # vim: tabstop=4 expandtab shiftwidth=4 |