How to use the lz4.block function in lz4

To help you get started, we’ve selected a few lz4 examples, based on popular ways it is used in public projects.

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github gnocchixyz / gnocchi / gnocchi / View on Github external
def unserialize(cls, data, key, aggregation):
        """Unserialize an aggregated timeserie.

        :param data: Raw data buffer.
        :param key: A :class:`SplitKey` key.
        :param aggregation: The Aggregation object of this timeseries.
        x, y = [], []

        if data:
            if cls.is_compressed(data):
                # Compressed format
                uncompressed = lz4.block.decompress(
                nb_points = len(uncompressed) // cls.COMPRESSED_SERIAL_LEN

                    y = numpy.frombuffer(uncompressed, dtype='
github facebookexperimental / eden / tests / View on Github external
def has_lz4():
        import lz4

        lz4.compress  # silence unused import warning
        return True
    except ImportError:
        return False
    except AttributeError:
    # modern lz4 has "compress" defined in lz4.block
        from lz4 import block as lz4block

        lz4block.compress  # silence unused import warning
        return True
    except (ImportError, AttributeError):
        return False
github XorTroll / Goldleaf / OldTinfoil / tools / View on Github external
def extract_nso(path_in, path_out):
    with open(path_in, 'rb') as f:
        text_off = read_u32(f, 0x10)
        text_loc = read_u32(f, 0x14)
        text_size = read_u32(f, 0x18)
        text_compressed_size = read_u32(f, 0x60)

        test_data = b'hello'

        print('Text offset: {}'.format(text_off))
        print('Text compressed size: {}'.format(text_compressed_size))
        print('Text uncompressed size: {}'.format(text_size))

        compressed_patched_text = read_at(f, text_off, text_compressed_size)
        text = lz4.block.decompress(compressed_patched_text, uncompressed_size=text_size)
        decompressed_hash = read_at(f, 0xA0, 0x20)
        calculated_hash = sha256(text)

        print('Compressed size: {}'.format(text_compressed_size))
        print('Decompressed hash: {}'.format(hx(decompressed_hash)))
        print('Calculated hash: {}'.format(hx(calculated_hash)))

        if decompressed_hash == calculated_hash:
github hydrusnetwork / hydrus / hydrus / client / View on Github external
def __init__( self, data, size, depth, compressed = True ):
        if not LZ4_OK:
            compressed = False
        self._compressed = compressed
        if self._compressed:
            self._data = lz4.block.compress( data )
            self._data = data
        self._size = size
        self._depth = depth
github ydkhatri / UnifiedLogReader / UnifiedLog / View on Github external
def DecompressChunkData(chunk_data, data_len):
    '''Decompress an individual compressed chunk (tag=0x600D)'''
    uncompressed = b''
    if chunk_data[0:4] in [b'bv41', b'bv4-']:
        last_uncompressed = b''
        comp_start = 0 # bv** offset
        comp_header = chunk_data[comp_start:comp_start + 4]
        while (data_len > comp_start) and (comp_header != b'bv4$'):
            if comp_header == b'bv41':
                uncompressed_size, compressed_size = struct.unpack('
github gusutabopb / corintick / corintick / View on Github external
def _deserialize_array(column: Mapping) -> np.ndarray:
    Takes raw binary compressed/serialized retrieved from MongoDB
    and decompresses/deserializes it, returning the original Numpy array
    :param column: Input column
    :return: Numpy array
    data = lz4.block.decompress(column['blob'])
    if column['dtype'] == 'object':
        return np.array([i.decode('utf-8') for i in msgpack.loads(data)])
        return np.load(io.BytesIO(data))
github reswitched / libtransistor / tools / View on Github external
assert data_segment['p_vaddr'] == dot
github electronicarts / ava-capture / capture-node / View on Github external
def _read_one_frame_16bit_linear(self, frame_index, resize_max_side):

        if frame_index<0 or frame_index>=self._frame_count:
            raise Exception('Invalid frame index %s' % frame_index)

        if self._raise_error_on_missing_frame and not self._frame_indices[frame_index]:
            raise Exception('Missing frame index %s' % frame_index)

        compressed_buffer = self._read_frame(frame_index)

        buffer = lz4block.decompress(compressed_buffer, uncompressed_size=self._img_data_size)
        raw_img = np.fromstring(buffer, np.uint8 if self.bitcount==8 else np.uint16).reshape((self.height,self.width))
        return raw_processing_to_16bit_linear(raw_img, self.bayer, self.blacklevel, self.bitcount, self.kB, self.kG, self.kR, resize_max_side=resize_max_side)
github ydkhatri / spotlight_parser / View on Github external
                if compressed_block.block_type & 0x1000 == 0x1000: # LZ4 compression
                    if block_data[20:24] in [b'bv41', b'bv4-']:
                        # check for bv41, version 97 in High Sierra has this header (bv41) and footer (bv4$)
                        # There are often multiple chunks  bv41.....bv41.....bv41.....bv4$
                        # Sometimes bv4- (uncompressed data) followed by 4 bytes length, then data
                        chunk_start = 20 # bv41 offset
                        uncompressed = b''
                        last_uncompressed = b''
                        header = block_data[chunk_start:chunk_start + 4]
                        while (self.block_size > chunk_start) and (header != b'bv4$'):  # b'bv41':
                            log.debug("0x{:X} - {}".format(chunk_start, header))
                            if header == b'bv41':
                                uncompressed_size, compressed_size = struct.unpack('
github Busindre / dumpzilla / View on Github external
def decompressLZ4(self, file):
        lz4_headers = [ b"mozLz40\0", b"mozLz40p\0", b"mozLz40o\0"]

        for header in lz4_headers:
          value =
          if value == header:
              return lz4.block.decompress(


        return None