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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| # -*- coding: utf-8 -*- | ||
| """The operating system attribute implementation.""" | ||
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| import os | ||
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| try: | ||
| import xattr | ||
| except ImportError: | ||
| xattr = None | ||
|
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| from dfvfs.vfs import attribute | ||
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| class OSExtendedAttribute(attribute.Attribute): | ||
| """Extended attribute that uses the operating system.""" | ||
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| def __init__(self, location, name): | ||
| """Initializes an attribute. | ||
| Args: | ||
| location (str): path of the file. | ||
| name (str): name of the extended attribute. | ||
| """ | ||
| super(OSExtendedAttribute, self).__init__() | ||
| self._current_offset = 0 | ||
| self._data = xattr.getxattr(location, name) | ||
| self._location = location | ||
| self._name = name | ||
| self._size = len(self._data) | ||
|
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| @property | ||
| def name(self): | ||
| """str: name.""" | ||
| return self._name | ||
|
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| # Note: that the following functions do not follow the style guide | ||
| # because they are part of the file-like object interface. | ||
| # pylint: disable=invalid-name | ||
|
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| def read(self, size=None): | ||
| """Reads a byte string from the file input/output (IO) object. | ||
| The function will read a byte string of the specified size or | ||
| all of the remaining data if no size was specified. | ||
| Args: | ||
| size (Optional[int]): number of bytes to read, where None is all | ||
| remaining data. | ||
| Returns: | ||
| bytes: data read. | ||
| Raises: | ||
| IOError: if the read failed. | ||
| OSError: if the read failed. | ||
| """ | ||
| if size is None: | ||
| size = self._size | ||
|
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| data = self._data[self._current_offset:self._current_offset + size] | ||
| self._current_offset += len(data) | ||
| return data | ||
|
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| def seek(self, offset, whence=os.SEEK_SET): | ||
| """Seeks to an offset within the file input/output (IO) object. | ||
| Args: | ||
| offset (int): offset to seek. | ||
| whence (Optional[int]): value that indicates whether offset is an | ||
| absolute or relative position within the file. | ||
| Raises: | ||
| IOError: if the seek failed. | ||
| OSError: if the seek failed. | ||
| """ | ||
| if whence == os.SEEK_CUR: | ||
| offset += self._current_offset | ||
| elif whence == os.SEEK_END: | ||
| offset = self._size - offset | ||
| elif whence != os.SEEK_SET: | ||
| raise IOError('Invalid whence') | ||
|
|
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| if offset < 0: | ||
| raise IOError('Invalid offset') | ||
|
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| self._current_offset = offset | ||
|
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| # get_offset() is preferred above tell() by the libbfio layer used in libyal. | ||
| def get_offset(self): | ||
| """Retrieves the current offset into the file input/output (IO) object. | ||
| Returns: | ||
| int: current offset into the file input/output (IO) object. | ||
| """ | ||
| return self._current_offset | ||
|
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| # Pythonesque alias for get_offset(). | ||
| def tell(self): | ||
| """Retrieves the current offset into the file input/output (IO) object.""" | ||
| return self.get_offset() | ||
|
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||
| def get_size(self): | ||
| """Retrieves the size of the file input/output (IO) object. | ||
| Returns: | ||
| int: size of the file input/output (IO) object. | ||
| """ | ||
| return self._size | ||
|
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||
| def seekable(self): | ||
| """Determines if a file input/output (IO) object is seekable. | ||
| Returns: | ||
| bool: True since a file IO object provides a seek method. | ||
| """ | ||
| return True |
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