| 1 | """Functions that read and write gzipped files.
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| 2 |
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| 3 | The user of the file doesn't have to worry about the compression,
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| 4 | but random access is not allowed."""
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| 5 |
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| 6 | # based on Andrew Kuchling's minigzip.py distributed with the zlib module
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| 7 |
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| 8 | import struct, sys, time
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| 9 | import zlib
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| 10 | import __builtin__
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| 11 |
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| 12 | __all__ = ["GzipFile","open"]
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| 13 |
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| 14 | FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16
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| 15 |
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| 16 | READ, WRITE = 1, 2
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| 17 |
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| 18 | def U32(i):
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| 19 | """Return i as an unsigned integer, assuming it fits in 32 bits.
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| 20 |
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| 21 | If it's >= 2GB when viewed as a 32-bit unsigned int, return a long.
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| 22 | """
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| 23 | if i < 0:
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| 24 | i += 1L << 32
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| 25 | return i
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| 26 |
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| 27 | def LOWU32(i):
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| 28 | """Return the low-order 32 bits of an int, as a non-negative int."""
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| 29 | return i & 0xFFFFFFFFL
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| 30 |
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| 31 | def write32(output, value):
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| 32 | output.write(struct.pack("<l", value))
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| 33 |
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| 34 | def write32u(output, value):
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| 35 | # The L format writes the bit pattern correctly whether signed
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| 36 | # or unsigned.
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| 37 | output.write(struct.pack("<L", value))
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| 38 |
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| 39 | def read32(input):
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| 40 | return struct.unpack("<l", input.read(4))[0]
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| 41 |
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| 42 | def open(filename, mode="rb", compresslevel=9):
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| 43 | """Shorthand for GzipFile(filename, mode, compresslevel).
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| 44 |
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| 45 | The filename argument is required; mode defaults to 'rb'
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| 46 | and compresslevel defaults to 9.
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| 47 |
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| 48 | """
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| 49 | return GzipFile(filename, mode, compresslevel)
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| 50 |
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| 51 | class GzipFile:
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| 52 | """The GzipFile class simulates most of the methods of a file object with
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| 53 | the exception of the readinto() and truncate() methods.
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| 54 |
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| 55 | """
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| 56 |
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| 57 | myfileobj = None
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| 58 | max_read_chunk = 10 * 1024 * 1024 # 10Mb
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| 59 |
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| 60 | def __init__(self, filename=None, mode=None,
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| 61 | compresslevel=9, fileobj=None):
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| 62 | """Constructor for the GzipFile class.
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| 63 |
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| 64 | At least one of fileobj and filename must be given a
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| 65 | non-trivial value.
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| 66 |
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| 67 | The new class instance is based on fileobj, which can be a regular
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| 68 | file, a StringIO object, or any other object which simulates a file.
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| 69 | It defaults to None, in which case filename is opened to provide
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| 70 | a file object.
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| 71 |
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| 72 | When fileobj is not None, the filename argument is only used to be
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| 73 | included in the gzip file header, which may includes the original
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| 74 | filename of the uncompressed file. It defaults to the filename of
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| 75 | fileobj, if discernible; otherwise, it defaults to the empty string,
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| 76 | and in this case the original filename is not included in the header.
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| 77 |
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| 78 | The mode argument can be any of 'r', 'rb', 'a', 'ab', 'w', or 'wb',
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| 79 | depending on whether the file will be read or written. The default
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| 80 | is the mode of fileobj if discernible; otherwise, the default is 'rb'.
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| 81 | Be aware that only the 'rb', 'ab', and 'wb' values should be used
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| 82 | for cross-platform portability.
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| 83 |
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| 84 | The compresslevel argument is an integer from 1 to 9 controlling the
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| 85 | level of compression; 1 is fastest and produces the least compression,
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| 86 | and 9 is slowest and produces the most compression. The default is 9.
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| 87 |
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| 88 | """
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| 89 |
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| 90 | # guarantee the file is opened in binary mode on platforms
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| 91 | # that care about that sort of thing
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| 92 | if mode and 'b' not in mode:
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| 93 | mode += 'b'
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| 94 | if fileobj is None:
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| 95 | fileobj = self.myfileobj = __builtin__.open(filename, mode or 'rb')
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| 96 | if filename is None:
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| 97 | if hasattr(fileobj, 'name'): filename = fileobj.name
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| 98 | else: filename = ''
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| 99 | if mode is None:
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| 100 | if hasattr(fileobj, 'mode'): mode = fileobj.mode
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| 101 | else: mode = 'rb'
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| 102 |
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| 103 | if mode[0:1] == 'r':
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| 104 | self.mode = READ
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| 105 | # Set flag indicating start of a new member
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| 106 | self._new_member = True
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| 107 | self.extrabuf = ""
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| 108 | self.extrasize = 0
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| 109 | self.filename = filename
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| 110 | # Starts small, scales exponentially
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| 111 | self.min_readsize = 100
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| 112 |
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| 113 | elif mode[0:1] == 'w' or mode[0:1] == 'a':
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| 114 | self.mode = WRITE
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| 115 | self._init_write(filename)
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| 116 | self.compress = zlib.compressobj(compresslevel,
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| 117 | zlib.DEFLATED,
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| 118 | -zlib.MAX_WBITS,
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| 119 | zlib.DEF_MEM_LEVEL,
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| 120 | 0)
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| 121 | else:
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| 122 | raise IOError, "Mode " + mode + " not supported"
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| 123 |
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| 124 | self.fileobj = fileobj
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| 125 | self.offset = 0
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| 126 |
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| 127 | if self.mode == WRITE:
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| 128 | self._write_gzip_header()
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| 129 |
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| 130 | def __repr__(self):
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| 131 | s = repr(self.fileobj)
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| 132 | return '<gzip ' + s[1:-1] + ' ' + hex(id(self)) + '>'
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| 133 |
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| 134 | def _init_write(self, filename):
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| 135 | if filename[-3:] != '.gz':
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| 136 | filename = filename + '.gz'
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| 137 | self.filename = filename
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| 138 | self.crc = zlib.crc32("")
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| 139 | self.size = 0
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| 140 | self.writebuf = []
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| 141 | self.bufsize = 0
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| 142 |
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| 143 | def _write_gzip_header(self):
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| 144 | self.fileobj.write('\037\213') # magic header
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| 145 | self.fileobj.write('\010') # compression method
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| 146 | fname = self.filename[:-3]
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| 147 | flags = 0
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| 148 | if fname:
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| 149 | flags = FNAME
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| 150 | self.fileobj.write(chr(flags))
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| 151 | write32u(self.fileobj, long(time.time()))
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| 152 | self.fileobj.write('\002')
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| 153 | self.fileobj.write('\377')
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| 154 | if fname:
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| 155 | self.fileobj.write(fname + '\000')
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| 156 |
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| 157 | def _init_read(self):
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| 158 | self.crc = zlib.crc32("")
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| 159 | self.size = 0
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| 160 |
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| 161 | def _read_gzip_header(self):
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| 162 | magic = self.fileobj.read(2)
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| 163 | if magic != '\037\213':
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| 164 | raise IOError, 'Not a gzipped file'
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| 165 | method = ord( self.fileobj.read(1) )
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| 166 | if method != 8:
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| 167 | raise IOError, 'Unknown compression method'
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| 168 | flag = ord( self.fileobj.read(1) )
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| 169 | # modtime = self.fileobj.read(4)
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| 170 | # extraflag = self.fileobj.read(1)
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| 171 | # os = self.fileobj.read(1)
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| 172 | self.fileobj.read(6)
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| 173 |
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| 174 | if flag & FEXTRA:
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| 175 | # Read & discard the extra field, if present
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| 176 | xlen = ord(self.fileobj.read(1))
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| 177 | xlen = xlen + 256*ord(self.fileobj.read(1))
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| 178 | self.fileobj.read(xlen)
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| 179 | if flag & FNAME:
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| 180 | # Read and discard a null-terminated string containing the filename
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| 181 | while True:
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| 182 | s = self.fileobj.read(1)
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| 183 | if not s or s=='\000':
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| 184 | break
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| 185 | if flag & FCOMMENT:
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| 186 | # Read and discard a null-terminated string containing a comment
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| 187 | while True:
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| 188 | s = self.fileobj.read(1)
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| 189 | if not s or s=='\000':
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| 190 | break
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| 191 | if flag & FHCRC:
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| 192 | self.fileobj.read(2) # Read & discard the 16-bit header CRC
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| 193 |
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| 194 |
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| 195 | def write(self,data):
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| 196 | if self.mode != WRITE:
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| 197 | import errno
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| 198 | raise IOError(errno.EBADF, "write() on read-only GzipFile object")
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| 199 |
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| 200 | if self.fileobj is None:
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| 201 | raise ValueError, "write() on closed GzipFile object"
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| 202 | if len(data) > 0:
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| 203 | self.size = self.size + len(data)
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| 204 | self.crc = zlib.crc32(data, self.crc)
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| 205 | self.fileobj.write( self.compress.compress(data) )
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| 206 | self.offset += len(data)
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| 207 |
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| 208 | def read(self, size=-1):
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| 209 | if self.mode != READ:
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| 210 | import errno
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| 211 | raise IOError(errno.EBADF, "read() on write-only GzipFile object")
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| 212 |
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| 213 | if self.extrasize <= 0 and self.fileobj is None:
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| 214 | return ''
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| 215 |
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| 216 | readsize = 1024
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| 217 | if size < 0: # get the whole thing
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| 218 | try:
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| 219 | while True:
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| 220 | self._read(readsize)
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| 221 | readsize = min(self.max_read_chunk, readsize * 2)
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| 222 | except EOFError:
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| 223 | size = self.extrasize
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| 224 | else: # just get some more of it
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| 225 | try:
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| 226 | while size > self.extrasize:
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| 227 | self._read(readsize)
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| 228 | readsize = min(self.max_read_chunk, readsize * 2)
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| 229 | except EOFError:
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| 230 | if size > self.extrasize:
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| 231 | size = self.extrasize
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| 232 |
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| 233 | chunk = self.extrabuf[:size]
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| 234 | self.extrabuf = self.extrabuf[size:]
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| 235 | self.extrasize = self.extrasize - size
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| 236 |
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| 237 | self.offset += size
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| 238 | return chunk
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| 239 |
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| 240 | def _unread(self, buf):
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| 241 | self.extrabuf = buf + self.extrabuf
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| 242 | self.extrasize = len(buf) + self.extrasize
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| 243 | self.offset -= len(buf)
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| 244 |
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| 245 | def _read(self, size=1024):
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| 246 | if self.fileobj is None:
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| 247 | raise EOFError, "Reached EOF"
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| 248 |
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| 249 | if self._new_member:
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| 250 | # If the _new_member flag is set, we have to
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| 251 | # jump to the next member, if there is one.
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| 252 | #
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| 253 | # First, check if we're at the end of the file;
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| 254 | # if so, it's time to stop; no more members to read.
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| 255 | pos = self.fileobj.tell() # Save current position
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| 256 | self.fileobj.seek(0, 2) # Seek to end of file
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| 257 | if pos == self.fileobj.tell():
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| 258 | raise EOFError, "Reached EOF"
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| 259 | else:
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| 260 | self.fileobj.seek( pos ) # Return to original position
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| 261 |
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| 262 | self._init_read()
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| 263 | self._read_gzip_header()
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| 264 | self.decompress = zlib.decompressobj(-zlib.MAX_WBITS)
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| 265 | self._new_member = False
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| 266 |
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| 267 | # Read a chunk of data from the file
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| 268 | buf = self.fileobj.read(size)
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| 269 |
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| 270 | # If the EOF has been reached, flush the decompression object
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| 271 | # and mark this object as finished.
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| 272 |
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| 273 | if buf == "":
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| 274 | uncompress = self.decompress.flush()
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| 275 | self._read_eof()
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| 276 | self._add_read_data( uncompress )
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| 277 | raise EOFError, 'Reached EOF'
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| 278 |
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| 279 | uncompress = self.decompress.decompress(buf)
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| 280 | self._add_read_data( uncompress )
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| 281 |
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| 282 | if self.decompress.unused_data != "":
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| 283 | # Ending case: we've come to the end of a member in the file,
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| 284 | # so seek back to the start of the unused data, finish up
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| 285 | # this member, and read a new gzip header.
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| 286 | # (The number of bytes to seek back is the length of the unused
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| 287 | # data, minus 8 because _read_eof() will rewind a further 8 bytes)
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| 288 | self.fileobj.seek( -len(self.decompress.unused_data)+8, 1)
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| 289 |
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| 290 | # Check the CRC and file size, and set the flag so we read
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| 291 | # a new member on the next call
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| 292 | self._read_eof()
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| 293 | self._new_member = True
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| 294 |
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| 295 | def _add_read_data(self, data):
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| 296 | self.crc = zlib.crc32(data, self.crc)
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| 297 | self.extrabuf = self.extrabuf + data
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| 298 | self.extrasize = self.extrasize + len(data)
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| 299 | self.size = self.size + len(data)
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| 300 |
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| 301 | def _read_eof(self):
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| 302 | # We've read to the end of the file, so we have to rewind in order
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| 303 | # to reread the 8 bytes containing the CRC and the file size.
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| 304 | # We check the that the computed CRC and size of the
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| 305 | # uncompressed data matches the stored values. Note that the size
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| 306 | # stored is the true file size mod 2**32.
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| 307 | self.fileobj.seek(-8, 1)
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| 308 | crc32 = read32(self.fileobj)
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| 309 | isize = U32(read32(self.fileobj)) # may exceed 2GB
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| 310 | if U32(crc32) != U32(self.crc):
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| 311 | raise IOError, "CRC check failed"
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| 312 | elif isize != LOWU32(self.size):
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| 313 | raise IOError, "Incorrect length of data produced"
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| 314 |
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| 315 | def close(self):
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| 316 | if self.mode == WRITE:
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| 317 | self.fileobj.write(self.compress.flush())
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| 318 | # The native zlib crc is an unsigned 32-bit integer, but
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| 319 | # the Python wrapper implicitly casts that to a signed C
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| 320 | # long. So, on a 32-bit box self.crc may "look negative",
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| 321 | # while the same crc on a 64-bit box may "look positive".
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| 322 | # To avoid irksome warnings from the `struct` module, force
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| 323 | # it to look positive on all boxes.
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| 324 | write32u(self.fileobj, LOWU32(self.crc))
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| 325 | # self.size may exceed 2GB, or even 4GB
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| 326 | write32u(self.fileobj, LOWU32(self.size))
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| 327 | self.fileobj = None
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| 328 | elif self.mode == READ:
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| 329 | self.fileobj = None
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| 330 | if self.myfileobj:
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| 331 | self.myfileobj.close()
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| 332 | self.myfileobj = None
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| 333 |
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| 334 | def __del__(self):
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| 335 | try:
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| 336 | if (self.myfileobj is None and
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| 337 | self.fileobj is None):
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| 338 | return
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| 339 | except AttributeError:
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| 340 | return
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| 341 | self.close()
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| 342 |
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| 343 | def flush(self,zlib_mode=zlib.Z_SYNC_FLUSH):
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| 344 | if self.mode == WRITE:
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| 345 | # Ensure the compressor's buffer is flushed
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|---|
| 346 | self.fileobj.write(self.compress.flush(zlib_mode))
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| 347 | self.fileobj.flush()
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| 348 |
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| 349 | def fileno(self):
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| 350 | """Invoke the underlying file object's fileno() method.
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| 351 |
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| 352 | This will raise AttributeError if the underlying file object
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| 353 | doesn't support fileno().
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| 354 | """
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|---|
| 355 | return self.fileobj.fileno()
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| 356 |
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| 357 | def isatty(self):
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| 358 | return False
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| 359 |
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|---|
| 360 | def tell(self):
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|---|
| 361 | return self.offset
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|---|
| 362 |
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|---|
| 363 | def rewind(self):
|
|---|
| 364 | '''Return the uncompressed stream file position indicator to the
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| 365 | beginning of the file'''
|
|---|
| 366 | if self.mode != READ:
|
|---|
| 367 | raise IOError("Can't rewind in write mode")
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|---|
| 368 | self.fileobj.seek(0)
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|---|
| 369 | self._new_member = True
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|---|
| 370 | self.extrabuf = ""
|
|---|
| 371 | self.extrasize = 0
|
|---|
| 372 | self.offset = 0
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|---|
| 373 |
|
|---|
| 374 | def seek(self, offset):
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|---|
| 375 | if self.mode == WRITE:
|
|---|
| 376 | if offset < self.offset:
|
|---|
| 377 | raise IOError('Negative seek in write mode')
|
|---|
| 378 | count = offset - self.offset
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|---|
| 379 | for i in range(count // 1024):
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|---|
| 380 | self.write(1024 * '\0')
|
|---|
| 381 | self.write((count % 1024) * '\0')
|
|---|
| 382 | elif self.mode == READ:
|
|---|
| 383 | if offset < self.offset:
|
|---|
| 384 | # for negative seek, rewind and do positive seek
|
|---|
| 385 | self.rewind()
|
|---|
| 386 | count = offset - self.offset
|
|---|
| 387 | for i in range(count // 1024):
|
|---|
| 388 | self.read(1024)
|
|---|
| 389 | self.read(count % 1024)
|
|---|
| 390 |
|
|---|
| 391 | def readline(self, size=-1):
|
|---|
| 392 | if size < 0:
|
|---|
| 393 | size = sys.maxint
|
|---|
| 394 | readsize = self.min_readsize
|
|---|
| 395 | else:
|
|---|
| 396 | readsize = size
|
|---|
| 397 | bufs = []
|
|---|
| 398 | while size != 0:
|
|---|
| 399 | c = self.read(readsize)
|
|---|
| 400 | i = c.find('\n')
|
|---|
| 401 |
|
|---|
| 402 | # We set i=size to break out of the loop under two
|
|---|
| 403 | # conditions: 1) there's no newline, and the chunk is
|
|---|
| 404 | # larger than size, or 2) there is a newline, but the
|
|---|
| 405 | # resulting line would be longer than 'size'.
|
|---|
| 406 | if (size <= i) or (i == -1 and len(c) > size):
|
|---|
| 407 | i = size - 1
|
|---|
| 408 |
|
|---|
| 409 | if i >= 0 or c == '':
|
|---|
| 410 | bufs.append(c[:i + 1]) # Add portion of last chunk
|
|---|
| 411 | self._unread(c[i + 1:]) # Push back rest of chunk
|
|---|
| 412 | break
|
|---|
| 413 |
|
|---|
| 414 | # Append chunk to list, decrease 'size',
|
|---|
| 415 | bufs.append(c)
|
|---|
| 416 | size = size - len(c)
|
|---|
| 417 | readsize = min(size, readsize * 2)
|
|---|
| 418 | if readsize > self.min_readsize:
|
|---|
| 419 | self.min_readsize = min(readsize, self.min_readsize * 2, 512)
|
|---|
| 420 | return ''.join(bufs) # Return resulting line
|
|---|
| 421 |
|
|---|
| 422 | def readlines(self, sizehint=0):
|
|---|
| 423 | # Negative numbers result in reading all the lines
|
|---|
| 424 | if sizehint <= 0:
|
|---|
| 425 | sizehint = sys.maxint
|
|---|
| 426 | L = []
|
|---|
| 427 | while sizehint > 0:
|
|---|
| 428 | line = self.readline()
|
|---|
| 429 | if line == "":
|
|---|
| 430 | break
|
|---|
| 431 | L.append(line)
|
|---|
| 432 | sizehint = sizehint - len(line)
|
|---|
| 433 |
|
|---|
| 434 | return L
|
|---|
| 435 |
|
|---|
| 436 | def writelines(self, L):
|
|---|
| 437 | for line in L:
|
|---|
| 438 | self.write(line)
|
|---|
| 439 |
|
|---|
| 440 | def __iter__(self):
|
|---|
| 441 | return self
|
|---|
| 442 |
|
|---|
| 443 | def next(self):
|
|---|
| 444 | line = self.readline()
|
|---|
| 445 | if line:
|
|---|
| 446 | return line
|
|---|
| 447 | else:
|
|---|
| 448 | raise StopIteration
|
|---|
| 449 |
|
|---|
| 450 |
|
|---|
| 451 | def _test():
|
|---|
| 452 | # Act like gzip; with -d, act like gunzip.
|
|---|
| 453 | # The input file is not deleted, however, nor are any other gzip
|
|---|
| 454 | # options or features supported.
|
|---|
| 455 | args = sys.argv[1:]
|
|---|
| 456 | decompress = args and args[0] == "-d"
|
|---|
| 457 | if decompress:
|
|---|
| 458 | args = args[1:]
|
|---|
| 459 | if not args:
|
|---|
| 460 | args = ["-"]
|
|---|
| 461 | for arg in args:
|
|---|
| 462 | if decompress:
|
|---|
| 463 | if arg == "-":
|
|---|
| 464 | f = GzipFile(filename="", mode="rb", fileobj=sys.stdin)
|
|---|
| 465 | g = sys.stdout
|
|---|
| 466 | else:
|
|---|
| 467 | if arg[-3:] != ".gz":
|
|---|
| 468 | print "filename doesn't end in .gz:", repr(arg)
|
|---|
| 469 | continue
|
|---|
| 470 | f = open(arg, "rb")
|
|---|
| 471 | g = __builtin__.open(arg[:-3], "wb")
|
|---|
| 472 | else:
|
|---|
| 473 | if arg == "-":
|
|---|
| 474 | f = sys.stdin
|
|---|
| 475 | g = GzipFile(filename="", mode="wb", fileobj=sys.stdout)
|
|---|
| 476 | else:
|
|---|
| 477 | f = __builtin__.open(arg, "rb")
|
|---|
| 478 | g = open(arg + ".gz", "wb")
|
|---|
| 479 | while True:
|
|---|
| 480 | chunk = f.read(1024)
|
|---|
| 481 | if not chunk:
|
|---|
| 482 | break
|
|---|
| 483 | g.write(chunk)
|
|---|
| 484 | if g is not sys.stdout:
|
|---|
| 485 | g.close()
|
|---|
| 486 | if f is not sys.stdin:
|
|---|
| 487 | f.close()
|
|---|
| 488 |
|
|---|
| 489 | if __name__ == '__main__':
|
|---|
| 490 | _test()
|
|---|
