zipstream.py 文件源码

def readfile(self, name):
        """Return file-like object for name."""
        if self.mode not in ("r", "a"):
            raise RuntimeError, 'read() requires mode "r" or "a"'
        if not self.fp:
            raise RuntimeError, \
                  "Attempt to read ZIP archive that was already closed"
        zinfo = self.getinfo(name)

        self.fp.seek(zinfo.header_offset, 0)

        # Skip the file header:
        fheader = self.fp.read(30)
        if fheader[0:4] != zipfile.stringFileHeader:
            raise zipfile.BadZipfile, "Bad magic number for file header"

        fheader = struct.unpack(zipfile.structFileHeader, fheader)
        fname = self.fp.read(fheader[zipfile._FH_FILENAME_LENGTH])
        if fheader[zipfile._FH_EXTRA_FIELD_LENGTH]:
            self.fp.read(fheader[zipfile._FH_EXTRA_FIELD_LENGTH])

        if fname != zinfo.orig_filename:
            raise zipfile.BadZipfile, \
                      'File name in directory "%s" and header "%s" differ.' % (
                          zinfo.orig_filename, fname)

        if zinfo.compress_type == zipfile.ZIP_STORED:
            return ZipFileEntry(self.fp, zinfo.compress_size)
        elif zinfo.compress_type == zipfile.ZIP_DEFLATED:
            if not zlib:
                raise RuntimeError, \
                      "De-compression requires the (missing) zlib module"
            return DeflatedZipFileEntry(self.fp, zinfo.compress_size)
        else:
            raise zipfile.BadZipfile, \
                  "Unsupported compression method %d for file %s" % \
            (zinfo.compress_type, name)