# Buggy code
def __init__(self, src, **kwds):
    self.kwds = kwds
    kwds = kwds.copy()

    ParserBase.__init__(self, kwds)

    if kwds.get("compression") is None and "utf-16" in (kwds.get("encoding") or ""):
        # if source is utf-16 plain text, convert source to utf-8
        if isinstance(src, str):
            src = open(src, "rb")
            self.handles.append(src)
        src = UTF8Recoder(src, kwds["encoding"])
        kwds["encoding"] = "utf-8"

    # #2442
    kwds["allow_leading_cols"] = self.index_col is not False

    # GH20529, validate usecol arg before TextReader
    self.usecols, self.usecols_dtype = _validate_usecols_arg(kwds["usecols"])
    kwds["usecols"] = self.usecols

    self._reader = parsers.TextReader(src, **kwds)
    self.unnamed_cols = self._reader.unnamed_cols

    passed_names = self.names is None

    if self._reader.header is None:
        self.names = None
    else:
        if len(self._reader.header) > 1:
            # we have a multi index in the columns
            (
                self.names,
                self.index_names,
                self.col_names,
                passed_names,
            ) = self._extract_multi_indexer_columns(
                self._reader.header, self.index_names, self.col_names, passed_names
            )
        else:
            self.names = list(self._reader.header[0])

    if self.names is None:
        if self.prefix:
            self.names = [f"{self.prefix}{i}" for i in range(self._reader.table_width)]
        else:
            self.names = list(range(self._reader.table_width))

    # gh-9755
    #
    # need to set orig_names here first
    # so that proper indexing can be done
    # with _set_noconvert_columns
    #
    # once names has been filtered, we will
    # then set orig_names again to names
    self.orig_names = self.names[:]

    if self.usecols:
        usecols = _evaluate_usecols(self.usecols, self.orig_names)

        # GH 14671
        if self.usecols_dtype == "string" and not set(usecols).issubset(
            self.orig_names
        ):
            _validate_usecols_names(usecols, self.orig_names)

        if len(self.names) > len(usecols):
            self.names = [
                n for i, n in enumerate(self.names) if (i in usecols or n in usecols)
            ]

        if len(self.names) < len(usecols):
            _validate_usecols_names(usecols, self.names)

    self._set_noconvert_columns()

    self.orig_names = self.names

    if not self._has_complex_date_col:
        if self._reader.leading_cols == 0 and _is_index_col(self.index_col):
            self._name_processed = True
            (index_names, self.names, self.index_col) = _clean_index_names(
                self.names, self.index_col, self.unnamed_cols
            )

            if self.index_names is None:
                self.index_names = index_names

        if self._reader.header is None and not passed_names:
            self.index_names = [None] * len(self.index_names)

    self._implicit_index = self._reader.leading_cols > 0


# Traceback (UnicodeDecodeError)
In [4]: with tempfile.TemporaryFile(mode='w+', encoding='utf16') as outfile:
...:     outfile.write('foo')
...:     outfile.seek(0)
...:     pd.read_csv(outfile, encoding='utf16')
UnicodeDecodeError: 'utf-16-le' codec can't decode byte 0x6f in position 2: truncated data

In [4]: with tempfile.TemporaryFile(mode='w+', encoding='utf32') as outfile:
...:     outfile.write('foo')
...:     outfile.seek(0)
...:     pd.read_csv(outfile, encoding='utf32')
UnicodeDecodeError: 'utf-32-le' codec can't decode bytes in position 0-2: truncated data

# Fixed code
def __init__(self, src, **kwds):
    self.kwds = kwds
    kwds = kwds.copy()

    ParserBase.__init__(self, kwds)

    encoding = kwds.get("encoding")

    if kwds.get("compression") is None and encoding:
        if isinstance(src, str):
            src = open(src, "rb")
            self.handles.append(src)

        # Handle the file object with universal line mode enabled.
        # We will handle the newline character ourselves later on.
        if isinstance(src, BufferedIOBase):
            src = TextIOWrapper(src, encoding=encoding, newline="")

        kwds["encoding"] = "utf-8"

    # #2442
    kwds["allow_leading_cols"] = self.index_col is not False

    # GH20529, validate usecol arg before TextReader
    self.usecols, self.usecols_dtype = _validate_usecols_arg(kwds["usecols"])
    kwds["usecols"] = self.usecols

    self._reader = parsers.TextReader(src, **kwds)
    self.unnamed_cols = self._reader.unnamed_cols

    passed_names = self.names is None

    if self._reader.header is None:
        self.names = None
    else:
        if len(self._reader.header) > 1:
            # we have a multi index in the columns
            (
                self.names,
                self.index_names,
                self.col_names,
                passed_names,
            ) = self._extract_multi_indexer_columns(
                self._reader.header, self.index_names, self.col_names, passed_names
            )
        else:
            self.names = list(self._reader.header[0])

    if self.names is None:
        if self.prefix:
            self.names = [f"{self.prefix}{i}" for i in range(self._reader.table_width)]
        else:
            self.names = list(range(self._reader.table_width))

    # gh-9755
    #
    # need to set orig_names here first
    # so that proper indexing can be done
    # with _set_noconvert_columns
    #
    # once names has been filtered, we will
    # then set orig_names again to names
    self.orig_names = self.names[:]

    if self.usecols:
        usecols = _evaluate_usecols(self.usecols, self.orig_names)

        # GH 14671
        if self.usecols_dtype == "string" and not set(usecols).issubset(
            self.orig_names
        ):
            _validate_usecols_names(usecols, self.orig_names)

        if len(self.names) > len(usecols):
            self.names = [
                n for i, n in enumerate(self.names) if (i in usecols or n in usecols)
            ]

        if len(self.names) < len(usecols):
            _validate_usecols_names(usecols, self.names)

    self._set_noconvert_columns()

    self.orig_names = self.names

    if not self._has_complex_date_col:
        if self._reader.leading_cols == 0 and _is_index_col(self.index_col):
            self._name_processed = True
            (index_names, self.names, self.index_col) = _clean_index_names(
                self.names, self.index_col, self.unnamed_cols
            )

            if self.index_names is None:
                self.index_names = index_names

        if self._reader.header is None and not passed_names:
            self.index_names = [None] * len(self.index_names)

    self._implicit_index = self._reader.leading_cols > 0