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