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File-like objects that read from or write to a bsddb record.

This implements (nearly) all stdio methods.

f = DBRecIO(db, key, txn=None)
f.close()           # explicitly release resources held
flag = f.isatty()   # always false
pos = f.tell()      # get current position
f.seek(pos)         # set current position
f.seek(pos, mode)   # mode 0: absolute; 1: relative; 2: relative to EOF
buf = f.read()      # read until EOF
buf = f.read(n)     # read up to n bytes
f.truncate([size])  # truncate file at to at most size (default: current pos)
f.write(buf)        # write at current position
f.writelines(list)  # for line in list: f.write(line)

Notes:
- fileno() is left unimplemented so that code which uses it triggers
  an exception early.
- There's a simple test set (see end of this file) - not yet updated
  for DBRecIO.
- readline() is not implemented yet.


From:
    Itamar Shtull-Trauring <itamar@maxnm.com>
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        if self.closed:
            raise ValueError, "I/O operation on closed file"
        if self.buflist:
            self.buf = self.buf + string.joinfields(self.buflist, '')
            self.buflist = []
        i = string.find(self.buf, '
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        if i < 0:
            newpos = self.len
        else:
            newpos = i+1
        if length is not None:
            if self.pos + length < newpos:
                newpos = self.pos + length
        r = self.buf[self.pos:newpos]
        self.pos = newpos
        return r

    def readlines(self, sizehint = 0):
        total = 0
        lines = []
        line = self.readline()
        while line:
            lines.append(line)
            total += len(line)
            if 0 < sizehint <= total:
                break
            line = self.readline()
        return lines
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