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Current File : /opt/imunify360/venv/lib64/python3.11/site-packages/maxminddb/decoder.py
"""
maxminddb.decoder
~~~~~~~~~~~~~~~~~

This package contains code for decoding the MaxMind DB data section.

"""
import struct
from typing import cast, Dict, List, Tuple, Union

try:
    # pylint: disable=unused-import
    import mmap
except ImportError:
    # pylint: disable=invalid-name
    mmap = None  # type: ignore


from maxminddb.errors import InvalidDatabaseError
from maxminddb.file import FileBuffer
from maxminddb.types import Record


class Decoder:  # pylint: disable=too-few-public-methods
    """Decoder for the data section of the MaxMind DB"""

    def __init__(
        self,
        database_buffer: Union[FileBuffer, "mmap.mmap", bytes],
        pointer_base: int = 0,
        pointer_test: bool = False,
    ) -> None:
        """Created a Decoder for a MaxMind DB

        Arguments:
        database_buffer -- an mmap'd MaxMind DB file.
        pointer_base -- the base number to use when decoding a pointer
        pointer_test -- used for internal unit testing of pointer code
        """
        self._pointer_test = pointer_test
        self._buffer = database_buffer
        self._pointer_base = pointer_base

    def _decode_array(self, size: int, offset: int) -> Tuple[List[Record], int]:
        array = []
        for _ in range(size):
            (value, offset) = self.decode(offset)
            array.append(value)
        return array, offset

    def _decode_boolean(self, size: int, offset: int) -> Tuple[bool, int]:
        return size != 0, offset

    def _decode_bytes(self, size: int, offset: int) -> Tuple[bytes, int]:
        new_offset = offset + size
        return self._buffer[offset:new_offset], new_offset

    def _decode_double(self, size: int, offset: int) -> Tuple[float, int]:
        self._verify_size(size, 8)
        new_offset = offset + size
        packed_bytes = self._buffer[offset:new_offset]
        (value,) = struct.unpack(b"!d", packed_bytes)
        return value, new_offset

    def _decode_float(self, size: int, offset: int) -> Tuple[float, int]:
        self._verify_size(size, 4)
        new_offset = offset + size
        packed_bytes = self._buffer[offset:new_offset]
        (value,) = struct.unpack(b"!f", packed_bytes)
        return value, new_offset

    def _decode_int32(self, size: int, offset: int) -> Tuple[int, int]:
        if size == 0:
            return 0, offset
        new_offset = offset + size
        packed_bytes = self._buffer[offset:new_offset]

        if size != 4:
            packed_bytes = packed_bytes.rjust(4, b"\x00")
        (value,) = struct.unpack(b"!i", packed_bytes)
        return value, new_offset

    def _decode_map(self, size: int, offset: int) -> Tuple[Dict[str, Record], int]:
        container: Dict[str, Record] = {}
        for _ in range(size):
            (key, offset) = self.decode(offset)
            (value, offset) = self.decode(offset)
            container[cast(str, key)] = value
        return container, offset

    def _decode_pointer(self, size: int, offset: int) -> Tuple[Record, int]:
        pointer_size = (size >> 3) + 1

        buf = self._buffer[offset : offset + pointer_size]
        new_offset = offset + pointer_size

        if pointer_size == 1:
            buf = bytes([size & 0x7]) + buf
            pointer = struct.unpack(b"!H", buf)[0] + self._pointer_base
        elif pointer_size == 2:
            buf = b"\x00" + bytes([size & 0x7]) + buf
            pointer = struct.unpack(b"!I", buf)[0] + 2048 + self._pointer_base
        elif pointer_size == 3:
            buf = bytes([size & 0x7]) + buf
            pointer = struct.unpack(b"!I", buf)[0] + 526336 + self._pointer_base
        else:
            pointer = struct.unpack(b"!I", buf)[0] + self._pointer_base

        if self._pointer_test:
            return pointer, new_offset
        (value, _) = self.decode(pointer)
        return value, new_offset

    def _decode_uint(self, size: int, offset: int) -> Tuple[int, int]:
        new_offset = offset + size
        uint_bytes = self._buffer[offset:new_offset]
        return int.from_bytes(uint_bytes, "big"), new_offset

    def _decode_utf8_string(self, size: int, offset: int) -> Tuple[str, int]:
        new_offset = offset + size
        return self._buffer[offset:new_offset].decode("utf-8"), new_offset

    _type_decoder = {
        1: _decode_pointer,
        2: _decode_utf8_string,
        3: _decode_double,
        4: _decode_bytes,
        5: _decode_uint,  # uint16
        6: _decode_uint,  # uint32
        7: _decode_map,
        8: _decode_int32,
        9: _decode_uint,  # uint64
        10: _decode_uint,  # uint128
        11: _decode_array,
        14: _decode_boolean,
        15: _decode_float,
    }

    def decode(self, offset: int) -> Tuple[Record, int]:
        """Decode a section of the data section starting at offset

        Arguments:
        offset -- the location of the data structure to decode
        """
        new_offset = offset + 1
        ctrl_byte = self._buffer[offset]
        type_num = ctrl_byte >> 5
        # Extended type
        if not type_num:
            (type_num, new_offset) = self._read_extended(new_offset)

        try:
            decoder = self._type_decoder[type_num]
        except KeyError as ex:
            raise InvalidDatabaseError(
                f"Unexpected type number ({type_num}) encountered"
            ) from ex

        (size, new_offset) = self._size_from_ctrl_byte(ctrl_byte, new_offset, type_num)
        return decoder(self, size, new_offset)

    def _read_extended(self, offset: int) -> Tuple[int, int]:
        next_byte = self._buffer[offset]
        type_num = next_byte + 7
        if type_num < 7:
            raise InvalidDatabaseError(
                "Something went horribly wrong in the decoder. An "
                f"extended type resolved to a type number < 8 ({type_num})"
            )
        return type_num, offset + 1

    @staticmethod
    def _verify_size(expected: int, actual: int) -> None:
        if expected != actual:
            raise InvalidDatabaseError(
                "The MaxMind DB file's data section contains bad data "
                "(unknown data type or corrupt data)"
            )

    def _size_from_ctrl_byte(
        self, ctrl_byte: int, offset: int, type_num: int
    ) -> Tuple[int, int]:
        size = ctrl_byte & 0x1F
        if type_num == 1 or size < 29:
            return size, offset

        if size == 29:
            size = 29 + self._buffer[offset]
            return size, offset + 1

        # Using unpack rather than int_from_bytes as it is faster
        # here and below.
        if size == 30:
            new_offset = offset + 2
            size_bytes = self._buffer[offset:new_offset]
            size = 285 + struct.unpack(b"!H", size_bytes)[0]
            return size, new_offset

        new_offset = offset + 3
        size_bytes = self._buffer[offset:new_offset]
        size = struct.unpack(b"!I", b"\x00" + size_bytes)[0] + 65821
        return size, new_offset

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