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| This class is like `StringIO` for `bytes` objects. There are a few notes at the bottom. This is a toy implementation. Known holes are marked with `XXX` comments. {{{#!python class BytesIO(object): """ A file-like API for reading and writing bytes objects. Mostly like StringIO, but write() calls modify the underlying bytes object. >>> b = bytes() >>> f = BytesIO(b, 'w') >>> f.write(bytes.fromhex('ca fe ba be')) >>> f.write(bytes.fromhex('57 41 56 45')) >>> b bytes([202, 254, 186, 190, 87, 65, 86, 69]) """ def __init__(self, buf, mode='r'): """ Create a new BytesIO for reading or writing the given buffer. buf - Back-end buffer for this BytesIO. A bytes object. Actually, anything that supports len(), slice-assignment, and += will work. mode - One of 'r', 'w', 'a'. An optional 'b' is also allowed, but it doesn't do anything. """ # XXX many 'mode' possibilities aren't allowed yet: 'rw+Ut' if len(mode) == 2 and mode[-1] == 'b': mode = mode[:-1] # binary mode goes without saying if mode not in ('r', 'w', 'a'): raise ValueError("mode must be 'r', 'w', or 'a'") self._buf = buf self.mode = mode self.closed = False if self.mode == 'w': del buf[:] self._point = 0 elif self.mode == 'r': self._point = 0 else: # 'a' self._point = len(buf) def close(self): self.closed = True def _check_closed(self): if self.closed: raise ValueError("file is closed") def flush(self): self._check_closed() def next(self): line = self.readline() if len(line) == 0: raise StopIteration return line def read(self, size=None): self._check_closed() if size is None: e = len(self._buf) else: e = min(self._point + size, len(self._buf)) r = self._buf[self._point:e] self._point = e return r def readline(self, size=None): self._check_closed() die # XXX TODO - assume ascii and read a line def readlines(self, sizehint=None): # XXX TODO handle sizehint return list(self) def seek(self, offset, whence=0): self._check_closed() if whence == 0: self._point = offset elif whence == 1: self._point += offset elif whence == 2: self._point = len(self._buf) + offset else: raise ValueError("whence must be 0, 1, or 2") if self._point < 0: self._point = 0 # XXX is this right? def tell(self): self._check_closed() return self._point def truncate(self, size=None): self._check_closed() if size is None: size = self.tell() del self._buf[size:] def write(self, data): self._check_closed() amt = len(data) size = len(self._buf) if self.mode == 'a': self._point = size if self._point > size: if isinstance(b, bytes): blank = bytes([0]) else: # Don't know what default value to insert, unfortunately raise ValueError("can't write past the end of this object") self._buf += blank * (self._point - size) + data self._point = len(self._buf) else: p = self._point self._buf[p:p + amt] = data self._point = min(p + amt, len(self._buf)) def writelines(self, seq): for line in seq: self.write(line) def __iter__(self): return self @property def name(self): return repr(self) }}} === Notes === You'll need the toy `bytes` implementation if you want to try this out. If you're in an extreme hurry you can just use this (not quite perfect): {{{#!python import array def bytes(seq=()): return array.array('B', seq) }}} There is no `BytesIO.getvalue()` method because it's not needed. Instead, just keep a reference to the underlying buffer. This works with lists and arrays, as well as bytes objects, but it's sort of a coincidence, rather than an actual design goal... |
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