utils.py 文件源码

def read_uncompressed_patch(pcpatch_wkb, schema):
    '''
    Patch binary structure uncompressed:
    byte:         endianness (1 = NDR, 0 = XDR)
    uint32:       pcid (key to POINTCLOUD_SCHEMAS)
    uint32:       0 = no compression
    uint32:       npoints
    pointdata[]:  interpret relative to pcid
    '''
    patchbin = unhexlify(pcpatch_wkb)
    npoints = unpack("I", patchbin[9:13])[0]
    dt = schema_dtype(schema)
    patch = np.fromstring(patchbin[13:], dtype=dt)
    # debug
    # print(patch[:10])
    return patch, npoints