gistfile1.py

    def write(self, fob, VixDiskLibSectorType offset, VixDiskLibSectorType length):
        """
        Writes a sector range.
        
        :param offset: Absolute offset.
        :param nblocks: Number of blocks to read.
        :param buff: np.ndarray of bytes
        
        Note: SECTORS_PER_BLOCK = DEFAULT_BLOCK_SIZE (1048576 or 1MB) / VIXDISKLIB_SECTOR_SIZE (512)
              SECTORS_PER_BLOCK = 2048 sectors
              1 block = 1048576 bytes or 1MB
        """
        cdef VixDiskLibSectorType position = offset
        cdef uint64 buffer_length = SECTORS_PER_BLOCK
        while True:
            if (position + buffer_length) > (offset + length):
                buffer_length = (offset + length) - position
            nbytes = buffer_length * VIXDISKLIB_SECTOR_SIZE
            log.debug("Writing %ld sectors to position %ld"  % (buffer_length, position))
            if self.buff == None:
                self.buff = np.empty(nbytes, dtype=DTYPE)
            if self.buff.size != nbytes:
                log.debug("Resizing buffer to %d" % nbytes)
                self.buff.resize(nbytes)
            pydata = fob.read(nbytes)
            self.buff.data = <char *>pydata
            vix_error = VixDiskLib_Write(self.handle, position, buffer_length, <uint8 *>self.buff.data)
            if vix_error != VIX_OK:
                self._handleError("Error writing to the disk: %s" % self.vmdk_path, vix_error)
            position += buffer_length
            if not (position < (offset + length)):
                break