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Merge sftp-leaks into catch-them-all

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bzrlib/_groupcompress_pyx.pyx
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cdef extern from "Python.h":
 
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    ctypedef struct PyObject:
 
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        pass
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    ctypedef int Py_ssize_t # Required for older pyrex versions
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    int PyString_CheckExact(object)
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    char * PyString_AS_STRING(object)
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             unsigned long *delta_size, unsigned long max_delta_size) nogil
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    unsigned long get_delta_hdr_size(unsigned char **datap,
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                                     unsigned char *top) nogil
 
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    unsigned long sizeof_delta_index(delta_index *index)
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    Py_ssize_t DELTA_SIZE_MIN
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    cdef readonly object _sources
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    cdef source_info *_source_infos
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    cdef delta_index *_index
 
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    cdef public unsigned long _source_offset
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    cdef readonly unsigned int _max_num_sources
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    cdef public unsigned long _source_offset
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    def __init__(self, source=None):
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        self._sources = []
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        if source is not None:
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            self.add_source(source, 0)
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    def __sizeof__(self):
 
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        # We want to track the _source_infos allocations, but the referenced
 
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        # void* are actually tracked in _sources itself.
 
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        # XXX: Cython is capable of doing sizeof(class) and returning the size
 
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        #      of the underlying struct. Pyrex (<= 0.9.9) refuses, so we need
 
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        #      to do it manually. *sigh* Note that we might get it wrong
 
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        #      because of alignment issues.
 
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        cdef Py_ssize_t size
 
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        # PyObject start, vtable *, 3 object pointers, 2 C ints
 
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        size = ((sizeof(PyObject) + sizeof(void*) + 3*sizeof(PyObject*)
 
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                 + sizeof(unsigned long)
 
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                 + sizeof(unsigned int))
 
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                + (sizeof(source_info) * self._max_num_sources)
 
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                + sizeof_delta_index(self._index))
 
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        return size
 
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    def __repr__(self):
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        return '%s(%d, %d)' % (self.__class__.__name__,
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            len(self._sources), self._source_offset)