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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 io import __builtin__ __all__ = ["GzipFile","open"] FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16 READ, WRITE = 1, 2 def write32u(output, value): # The L format writes the bit pattern correctly whether signed # or unsigned. output.write(struct.pack("': filename = '' if mode is None: if hasattr(fileobj, 'mode'): mode = fileobj.mode else: mode = 'rb' if mode[0:1] == 'r': self.mode = READ # Set flag indicating start of a new member self._new_member = True # Buffer data read from gzip file. extrastart is offset in # stream where buffer starts. extrasize is number of # bytes remaining in buffer from current stream position. self.extrabuf = "" self.extrasize = 0 self.extrastart = 0 self.name = filename # Starts small, scales exponentially self.min_readsize = 100 elif mode[0:1] == 'w' or mode[0:1] == 'a': self.mode = WRITE self._init_write(filename) self.compress = zlib.compressobj(compresslevel, zlib.DEFLATED, -zlib.MAX_WBITS, zlib.DEF_MEM_LEVEL, 0) else: raise IOError, "Mode " + mode + " not supported" self.fileobj = fileobj self.offset = 0 self.mtime = mtime if self.mode == WRITE: self._write_gzip_header() @property def filename(self): import warnings warnings.warn("use the name attribute", DeprecationWarning, 2) if self.mode == WRITE and self.name[-3:] != ".gz": return self.name + ".gz" return self.name def __repr__(self): s = repr(self.fileobj) return '' 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("") & 0xffffffffL self.size = 0 self.writebuf = [] self.bufsize = 0 def _write_gzip_header(self): self.fileobj.write('\037\213') # magic header self.fileobj.write('\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, str): fname = fname.encode('latin-1') if fname.endswith('.gz'): fname = fname[:-3] except UnicodeEncodeError: fname = '' flags = 0 if fname: flags = FNAME self.fileobj.write(chr(flags)) mtime = self.mtime if mtime is None: mtime = time.time() write32u(self.fileobj, long(mtime)) self.fileobj.write('\002') self.fileobj.write('\377') if fname: self.fileobj.write(fname + '\000') def _init_read(self): self.crc = zlib.crc32("") & 0xffffffffL self.size = 0 def _read_gzip_header(self): magic = self.fileobj.read(2) if magic != '\037\213': raise IOError, 'Not a gzipped file' method = ord( self.fileobj.read(1) ) if method != 8: raise IOError, 'Unknown compression method' flag = ord( self.fileobj.read(1) ) self.mtime = read32(self.fileobj) # extraflag = self.fileobj.read(1) # os = self.fileobj.read(1) self.fileobj.read(2) if flag & FEXTRA: # Read & discard the extra field, if present xlen = ord(self.fileobj.read(1)) xlen = xlen + 256*ord(self.fileobj.read(1)) self.fileobj.read(xlen) if flag & FNAME: # Read and discard a null-terminated string containing the filename while True: s = self.fileobj.read(1) if not s or s=='\000': break if flag & FCOMMENT: # Read and discard a null-terminated string containing a comment while True: s = self.fileobj.read(1) if not s or s=='\000': break if flag & FHCRC: self.fileobj.read(2) # Read & discard the 16-bit header CRC def write(self,data): self._check_closed() if self.mode != WRITE: import errno raise IOError(errno.EBADF, "write() on read-only GzipFile object") if self.fileobj is None: raise ValueError, "write() on closed GzipFile object" # Convert data type if called by io.BufferedWriter. if isinstance(data, memoryview): data = data.tobytes() if len(data) > 0: self.fileobj.write(self.compress.compress(data)) self.size += len(data) self.crc = zlib.crc32(data, self.crc) & 0xffffffffL self.offset += len(data) return len(data) def read(self, size=-1): self._check_closed() if self.mode != READ: import errno raise IOError(errno.EBADF, "read() on write-only GzipFile object") if self.extrasize <= 0 and self.fileobj is None: return '' readsize = 1024 if size < 0: # get the whole thing try: while True: self._read(readsize) readsize = min(self.max_read_chunk, readsize * 2) except EOFError: size = self.extrasize else: # just get some more of it try: while size > self.extrasize: self._read(readsize) readsize = min(self.max_read_chunk, readsize * 2) except EOFError: if size > self.extrasize: size = self.extrasize offset = self.offset - self.extrastart chunk = self.extrabuf[offset: offset + size] self.extrasize = self.extrasize - size self.offset += size return chunk def _unread(self, buf): self.extrasize = len(buf) + self.extrasize self.offset -= len(buf) def _read(self, size=1024): if self.fileobj is None: raise EOFError, "Reached EOF" if self._new_member: # If the _new_member flag is set, we have to # jump to the next member, if there is one. # # First, check if we're at the end of the file; # if so, it's time to stop; no more members to read. pos = self.fileobj.tell() # Save current position self.fileobj.seek(0, 2) # Seek to end of file if pos == self.fileobj.tell(): raise EOFError, "Reached EOF" else: self.fileobj.seek( pos ) # Return to original position self._init_read() self._read_gzip_header() 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 == "": uncompress = self.decompress.flush() self._read_eof() self._add_read_data( uncompress ) raise EOFError, 'Reached EOF' uncompress = self.decompress.decompress(buf) self._add_read_data( uncompress ) if self.decompress.unused_data != "": # 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. # (The number of bytes to seek back is the length of the unused # data, minus 8 because _read_eof() will rewind a further 8 bytes) self.fileobj.seek( -len(self.decompress.unused_data)+8, 1) # 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 def _add_read_data(self, data): self.crc = zlib.crc32(data, self.crc) & 0xffffffffL 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, so we have to rewind in order # to reread the 8 bytes containing the CRC and the file size. # 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. self.fileobj.seek(-8, 1) crc32 = read32(self.fileobj) isize = read32(self.fileobj) # may exceed 2GB if crc32 != self.crc: raise IOError("CRC check failed %s != %s" % (hex(crc32), hex(self.crc))) elif isize != (self.size & 0xffffffffL): raise IOError, "Incorrect length of data produced" # Gzip files can be padded with zeroes and still have archives. # Consume all zero bytes and set the file position to the first # non-zero byte. See http://www.gzip.org/#faq8 c = "\x00" while c == "\x00": c = self.fileobj.read(1) if c: self.fileobj.seek(-1, 1) @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 2GB, or even 4GB write32u(fileobj, self.size & 0xffffffffL) finally: myfileobj = self.myfileobj if myfileobj: self.myfileobj = None myfileobj.close() def flush(self,zlib_mode=zlib.Z_SYNC_FLUSH): self._check_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 IOError("Can't rewind in write mode") self.fileobj.seek(0) self._new_member = True self.extrabuf = "" self.extrasize = 0 self.extrastart = 0 self.offset = 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=0): if whence: if whence == 1: offset = self.offset + offset else: raise ValueError('Seek from end not supported') if self.mode == WRITE: if offset < self.offset: raise IOError('Negative seek in write mode') count = offset - self.offset for i in xrange(count // 1024): self.write(1024 * '\0') self.write((count % 1024) * '\0') elif self.mode == READ: if offset < self.offset: # for negative seek, rewind and do positive seek self.rewind() count = offset - self.offset for i in xrange(count // 1024): self.read(1024) self.read(count % 1024) return self.offset def readline(self, size=-1): if size < 0: # Shortcut common case - newline found in buffer. offset = self.offset - self.extrastart i = self.extrabuf.find('\n', offset) + 1 if i > 0: self.extrasize -= i - offset self.offset += i - offset return self.extrabuf[offset: i] size = sys.maxint readsize = self.min_readsize else: readsize = size bufs = [] while size != 0: c = self.read(readsize) i = c.find('\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 == '': 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 ''.join(bufs) # Return resulting line 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) g = sys.stdout else: if arg[-3:] != ".gz": print "filename doesn't end in .gz:", repr(arg) continue f = open(arg, "rb") g = __builtin__.open(arg[:-3], "wb") else: if arg == "-": f = sys.stdin g = GzipFile(filename="", mode="wb", fileobj=sys.stdout) else: f = __builtin__.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: g.close() if f is not sys.stdin: f.close() if __name__ == '__main__': _test()