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python-javaobj/javaobj/v2/stream.py at 0.4.4 · tcalmant/python-javaobj · GitHub
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stream.py
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javaobj
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v2
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stream.py
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#!/usr/bin/env python3
"""
Utility module to handle streams like in Java
:authors: Thomas Calmant
:license: Apache License 2.0
:version: 0.4.4
:status: Alpha
..
Copyright 2024 Thomas Calmant
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
from
__future__
import
absolute_import
import
struct
from
typing
import
IO
,
Any
,
Tuple
# pylint:disable=W0611
from
..
modifiedutf8
import
decode_modified_utf8
from
..
utils
import
UNICODE_TYPE
,
unicode_char
# pylint:disable=W0611
# ------------------------------------------------------------------------------
# Module version
__version_info__
=
(
0
,
4
,
4
)
__version__
=
"."
.
join
(
str
(
x
)
for
x
in
__version_info__
)
# Documentation strings format
__docformat__
=
"restructuredtext en"
# ------------------------------------------------------------------------------
class
DataStreamReader
:
"""
Reads the given file object with object input stream-like methods
"""
def
__init__
(
self
,
fd
):
# type: (IO[bytes]) -> None
"""
:param fd: The input stream
"""
self
.
__fd
=
fd
@
property
def
file_descriptor
(
self
):
# type: () -> IO[bytes]
"""
The underlying file descriptor
"""
return
self
.
__fd
def
read
(
self
,
struct_format
):
# type: (str) -> Tuple[Any, ...]
"""
Reads from the input stream, using struct
:param struct_format: An unpack format string
:return: The result of struct.unpack (tuple)
:raise EOFError: End of stream reached during unpacking
"""
length
=
struct
.
calcsize
(
struct_format
)
bytes_array
=
self
.
__fd
.
read
(
length
)
if
len
(
bytes_array
)
!=
length
:
raise
EOFError
(
"Stream has ended unexpectedly while parsing."
)
return
struct
.
unpack
(
struct_format
,
bytes_array
)
def
read_bool
(
self
):
# type: () -> bool
"""
Shortcut to read a single `boolean` (1 byte)
"""
return
bool
(
self
.
read
(
">B"
)[
0
])
def
read_byte
(
self
):
# type: () -> int
"""
Shortcut to read a single `byte` (1 byte)
"""
return
self
.
read
(
">b"
)[
0
]
def
read_ubyte
(
self
):
# type: () -> int
"""
Shortcut to read an unsigned `byte` (1 byte)
"""
return
self
.
read
(
">B"
)[
0
]
def
read_char
(
self
):
# type: () -> UNICODE_TYPE
"""
Shortcut to read a single `char` (2 bytes)
"""
return
unicode_char
(
self
.
read
(
">H"
)[
0
])
def
read_short
(
self
):
# type: () -> int
"""
Shortcut to read a single `short` (2 bytes)
"""
return
self
.
read
(
">h"
)[
0
]
def
read_ushort
(
self
):
# type: () -> int
"""
Shortcut to read an unsigned `short` (2 bytes)
"""
return
self
.
read
(
">H"
)[
0
]
def
read_int
(
self
):
# type: () -> int
"""
Shortcut to read a single `int` (4 bytes)
"""
return
self
.
read
(
">i"
)[
0
]
def
read_float
(
self
):
# type: () -> float
"""
Shortcut to read a single `float` (4 bytes)
"""
return
self
.
read
(
">f"
)[
0
]
def
read_long
(
self
):
# type: () -> int
"""
Shortcut to read a single `long` (8 bytes)
"""
return
self
.
read
(
">q"
)[
0
]
def
read_double
(
self
):
# type: () -> float
"""
Shortcut to read a single `double` (8 bytes)
"""
return
self
.
read
(
">d"
)[
0
]
def
read_UTF
(
self
):
# pylint:disable=C0103
# type: () -> str
"""
Reads a Java string
"""
length
=
self
.
read_ushort
()
ba
=
self
.
__fd
.
read
(
length
)
return
decode_modified_utf8
(
ba
)[
0
]
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