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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 __all__ = ["GzipFile", "open", "compress", "decompress"] FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16 READ, WRITE = 1, 2 def open(filename, mode="rb", compresslevel=9, 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)): 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 _check_closed(self): """Raises a ValueError if the underlying file object has been closed. """ if self.closed: raise ValueError('I/O operation on closed file.') def _init_write(self, filename): self.name = filename self.crc = zlib.crc32(b"") & 0xffffffff self.size = 0 self.writebuf = [] self.bufsize = 0 def _write_gzip_header(self): 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.mtime if mtime is None: mtime = time.time() write32u(self.fileobj, int(mtime)) self.fileobj.write(b'\002') self.fileobj.write(b'\377') if fname: self.fileobj.write(fname + b'\000') def _init_read(self): self.crc = zlib.crc32(b"") & 0xffffffff self.size = 0 def _read_exact(self, n): data = self.fileobj.read(n) while len(data) < n: b = self.fileobj.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.fileobj.read(2) if magic == b'': return False if magic != b'\037\213': raise OSError('Not a gzipped file') method, flag, self.mtime = struct.unpack(" 0: self.fileobj.write(self.compress.compress(data)) self.size += len(data) self.crc = zlib.crc32(data, self.crc) & 0xffffffff self.offset += len(data) return len(data) def read(self, size=-1): self._check_closed() if self.mode != READ: import errno raise OSError(errno.EBADF, "read() on write-only GzipFile object") if self.extrasize <= 0 and self.fileobj is None: return b'' readsize = 1024 if size < 0: # get the whole thing while self._read(readsize): readsize = min(self.max_read_chunk, readsize * 2) size = self.extrasize else: # just get some more of it while size > self.extrasize: if not self._read(readsize): if size > self.extrasize: size = self.extrasize break readsize = min(self.max_read_chunk, readsize * 2) offset = self.offset - self.extrastart chunk = self.extrabuf[offset: offset + size] self.extrasize = self.extrasize - size self.offset += size return chunk def read1(self, size=-1): self._check_closed() if self.mode != READ: import errno raise OSError(errno.EBADF, "read1() on write-only GzipFile object") if self.extrasize <= 0 and self.fileobj is None: return b'' # For certain input data, a single call to _read() may not return # any data. In this case, retry until we get some data or reach EOF. while self.extrasize <= 0 and self._read(): pass if size < 0 or size > self.extrasize: size = self.extrasize offset = self.offset - self.extrastart chunk = self.extrabuf[offset: offset + size] self.extrasize -= size self.offset += size return chunk def peek(self, n): if self.mode != READ: import errno raise OSError(errno.EBADF, "peek() on write-only GzipFile object") # Do not return ridiculously small buffers, for one common idiom # is to call peek(1) and expect more bytes in return. if n < 100: n = 100 if self.extrasize == 0: if self.fileobj is None: return b'' # Ensure that we don't return b"" if we haven't reached EOF. # 1024 is the same buffering heuristic used in read() while self.extrasize == 0 and self._read(max(n, 1024)): pass offset = self.offset - self.extrastart remaining = self.extrasize assert remaining == len(self.extrabuf) - offset return self.extrabuf[offset:offset + n] def _unread(self, buf): self.extrasize = len(buf) + self.extrasize self.offset -= len(buf) def _read(self, size=1024): if self.fileobj is None: return False if self._new_member: # If the _new_member flag is set, we have to # jump to the next member, if there is one. self._init_read() if not self._read_gzip_header(): return False self.decompress = zlib.decompressobj(-zlib.MAX_WBITS) self._new_member = False # Read a chunk of data from the file buf = self.fileobj.read(size) # If the EOF has been reached, flush the decompression object # and mark this object as finished. if buf == b"": uncompress = self.decompress.flush() # Prepend the already read bytes to the fileobj to they can be # seen by _read_eof() self.fileobj.prepend(self.decompress.unused_data, True) self._read_eof() self._add_read_data( uncompress ) return False uncompress = self.decompress.decompress(buf) self._add_read_data( uncompress ) if self.decompress.unused_data != b"": # Ending case: we've come to the end of a member in the file, # so seek back to the start of the unused data, finish up # this member, and read a new gzip header. # Prepend the already read bytes to the fileobj to they can be # seen by _read_eof() and _read_gzip_header() self.fileobj.prepend(self.decompress.unused_data, True) # Check the CRC and file size, and set the flag so we read # a new member on the next call self._read_eof() self._new_member = True return True def _add_read_data(self, data): self.crc = zlib.crc32(data, self.crc) & 0xffffffff offset = self.offset - self.extrastart self.extrabuf = self.extrabuf[offset:] + data self.extrasize = self.extrasize + len(data) self.extrastart = self.offset self.size = self.size + len(data) def _read_eof(self): # We've read to the end of the file # We check the that the computed CRC and size of the # uncompressed data matches the stored values. Note that the size # stored is the true file size mod 2**32. crc32, isize = struct.unpack(" 0: self.extrasize -= i - offset self.offset += i - offset return self.extrabuf[offset: i] size = sys.maxsize readsize = self.min_readsize else: readsize = size bufs = [] while size != 0: c = self.read(readsize) i = c.find(b'\n') # We set i=size to break out of the loop under two # conditions: 1) there's no newline, and the chunk is # larger than size, or 2) there is a newline, but the # resulting line would be longer than 'size'. if (size <= i) or (i == -1 and len(c) > size): i = size - 1 if i >= 0 or c == b'': bufs.append(c[:i + 1]) # Add portion of last chunk self._unread(c[i + 1:]) # Push back rest of chunk break # Append chunk to list, decrease 'size', bufs.append(c) size = size - len(c) readsize = min(size, readsize * 2) if readsize > self.min_readsize: self.min_readsize = min(readsize, self.min_readsize * 2, 512) return b''.join(bufs) # Return resulting line def compress(data, compresslevel=9): """Compress data in one shot and return the compressed string. Optional argument is the compression level, in range of 0-9. """ buf = io.BytesIO() with GzipFile(fileobj=buf, mode='wb', compresslevel=compresslevel) as f: f.write(data) return buf.getvalue() def decompress(data): """Decompress a gzip compressed string in one shot. Return the decompressed string. """ with GzipFile(fileobj=io.BytesIO(data)) as f: return f.read() def _test(): # Act like gzip; with -d, act like gunzip. # The input file is not deleted, however, nor are any other gzip # options or features supported. args = sys.argv[1:] decompress = args and args[0] == "-d" if decompress: args = args[1:] if not args: args = ["-"] for arg in args: if decompress: if arg == "-": f = GzipFile(filename="", mode="rb", fileobj=sys.stdin.buffer) g = sys.stdout.buffer else: if arg[-3:] != ".gz": print("filename doesn't end in .gz:", repr(arg)) continue f = open(arg, "rb") g = builtins.open(arg[:-3], "wb") else: if arg == "-": f = sys.stdin.buffer g = GzipFile(filename="", mode="wb", fileobj=sys.stdout.buffer) else: f = builtins.open(arg, "rb") g = open(arg + ".gz", "wb") while True: chunk = f.read(1024) if not chunk: break g.write(chunk) if g is not sys.stdout.buffer: g.close() if f is not sys.stdin.buffer: f.close() if __name__ == '__main__': _test()