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"""Functions that read and write gzipped files. The user of the file doesn't have to worry about the compression, but random access is not allowed.""" # based on Andrew Kuchling's minigzip.py distributed with the zlib module import struct, sys, time, os import zlib import builtins import io import _compression __all__ = ["BadGzipFile", "GzipFile", "open", "compress", "decompress"] FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16 READ, WRITE = 1, 2 _COMPRESS_LEVEL_FAST = 1 _COMPRESS_LEVEL_TRADEOFF = 6 _COMPRESS_LEVEL_BEST = 9 def open(filename, mode="rb", compresslevel=_COMPRESS_LEVEL_BEST, encoding=None, errors=None, newline=None): """Open a gzip-compressed file in binary or text mode. The filename argument can be an actual filename (a str or bytes object), or an existing file object to read from or write to. The mode argument can be "r", "rb", "w", "wb", "x", "xb", "a" or "ab" for binary mode, or "rt", "wt", "xt" or "at" for text mode. The default mode is "rb", and the default compresslevel is 9. For binary mode, this function is equivalent to the GzipFile constructor: GzipFile(filename, mode, compresslevel). In this case, the encoding, errors and newline arguments must not be provided. For text mode, a GzipFile object is created, and wrapped in an io.TextIOWrapper instance with the specified encoding, error handling behavior, and line ending(s). """ if "t" in mode: if "b" in mode: raise ValueError("Invalid mode: %r" % (mode,)) else: if encoding is not None: raise ValueError("Argument 'encoding' not supported in binary mode") if errors is not None: raise ValueError("Argument 'errors' not supported in binary mode") if newline is not None: raise ValueError("Argument 'newline' not supported in binary mode") gz_mode = mode.replace("t", "") if isinstance(filename, (str, bytes, os.PathLike)): binary_file = GzipFile(filename, gz_mode, compresslevel) elif hasattr(filename, "read") or hasattr(filename, "write"): binary_file = GzipFile(None, gz_mode, compresslevel, filename) else: raise TypeError("filename must be a str or bytes object, or a file") if "t" in mode: return io.TextIOWrapper(binary_file, encoding, errors, newline) else: return binary_file def write32u(output, value): # The L format writes the bit pattern correctly whether signed # or unsigned. output.write(struct.pack("' def _init_write(self, filename): self.name = filename self.crc = zlib.crc32(b"") self.size = 0 self.writebuf = [] self.bufsize = 0 self.offset = 0 # Current file offset for seek(), tell(), etc def _write_gzip_header(self, compresslevel): self.fileobj.write(b'\037\213') # magic header self.fileobj.write(b'\010') # compression method try: # RFC 1952 requires the FNAME field to be Latin-1. Do not # include filenames that cannot be represented that way. fname = os.path.basename(self.name) if not isinstance(fname, bytes): fname = fname.encode('latin-1') if fname.endswith(b'.gz'): fname = fname[:-3] except UnicodeEncodeError: fname = b'' flags = 0 if fname: flags = FNAME self.fileobj.write(chr(flags).encode('latin-1')) mtime = self._write_mtime if mtime is None: mtime = time.time() write32u(self.fileobj, int(mtime)) if compresslevel == _COMPRESS_LEVEL_BEST: xfl = b'\002' elif compresslevel == _COMPRESS_LEVEL_FAST: xfl = b'\004' else: xfl = b'\000' self.fileobj.write(xfl) self.fileobj.write(b'\377') if fname: self.fileobj.write(fname + b'\000') def write(self,data): self._check_not_closed() if self.mode != WRITE: import errno raise OSError(errno.EBADF, "write() on read-only GzipFile object") if self.fileobj is None: raise ValueError("write() on closed GzipFile object") if isinstance(data, bytes): length = len(data) else: # accept any data that supports the buffer protocol data = memoryview(data) length = data.nbytes if length > 0: self.fileobj.write(self.compress.compress(data)) self.size += length self.crc = zlib.crc32(data, self.crc) self.offset += length return length def read(self, size=-1): self._check_not_closed() if self.mode != READ: import errno raise OSError(errno.EBADF, "read() on write-only GzipFile object") return self._buffer.read(size) def read1(self, size=-1): """Implements BufferedIOBase.read1() Reads up to a buffer's worth of data if size is negative.""" self._check_not_closed() if self.mode != READ: import errno raise OSError(errno.EBADF, "read1() on write-only GzipFile object") if size < 0: size = io.DEFAULT_BUFFER_SIZE return self._buffer.read1(size) def peek(self, n): self._check_not_closed() if self.mode != READ: import errno raise OSError(errno.EBADF, "peek() on write-only GzipFile object") return self._buffer.peek(n) @property def closed(self): return self.fileobj is None def close(self): fileobj = self.fileobj if fileobj is None: return self.fileobj = None try: if self.mode == WRITE: fileobj.write(self.compress.flush()) write32u(fileobj, self.crc) # self.size may exceed 2 GiB, or even 4 GiB write32u(fileobj, self.size & 0xffffffff) elif self.mode == READ: self._buffer.close() finally: myfileobj = self.myfileobj if myfileobj: self.myfileobj = None myfileobj.close() def flush(self,zlib_mode=zlib.Z_SYNC_FLUSH): self._check_not_closed() if self.mode == WRITE: # Ensure the compressor's buffer is flushed self.fileobj.write(self.compress.flush(zlib_mode)) self.fileobj.flush() def fileno(self): """Invoke the underlying file object's fileno() method. This will raise AttributeError if the underlying file object doesn't support fileno(). """ return self.fileobj.fileno() def rewind(self): '''Return the uncompressed stream file position indicator to the beginning of the file''' if self.mode != READ: raise OSError("Can't rewind in write mode") self._buffer.seek(0) def readable(self): return self.mode == READ def writable(self): return self.mode == WRITE def seekable(self): return True def seek(self, offset, whence=io.SEEK_SET): if self.mode == WRITE: if whence != io.SEEK_SET: if whence == io.SEEK_CUR: offset = self.offset + offset else: raise ValueError('Seek from end not supported') if offset < self.offset: raise OSError('Negative seek in write mode') count = offset - self.offset chunk = b'\0' * 1024 for i in range(count // 1024): self.write(chunk) self.write(b'\0' * (count % 1024)) elif self.mode == READ: self._check_not_closed() return self._buffer.seek(offset, whence) return self.offset def readline(self, size=-1): self._check_not_closed() return self._buffer.readline(size) class _GzipReader(_compression.DecompressReader): def __init__(self, fp): super().__init__(_PaddedFile(fp), zlib.decompressobj, wbits=-zlib.MAX_WBITS) # Set flag indicating start of a new member self._new_member = True self._last_mtime = None def _init_read(self): self._crc = zlib.crc32(b"") self._stream_size = 0 # Decompressed size of unconcatenated stream def _read_exact(self, n): '''Read exactly *n* bytes from `self._fp` This method is required because self._fp may be unbuffered, i.e. return short reads. ''' data = self._fp.read(n) while len(data) < n: b = self._fp.read(n - len(data)) if not b: raise EOFError("Compressed file ended before the " "end-of-stream marker was reached") data += b return data def _read_gzip_header(self): magic = self._fp.read(2) if magic == b'': return False if magic != b'\037\213': raise BadGzipFile('Not a gzipped file (%r)' % magic) (method, flag, self._last_mtime) = struct.unpack("