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45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
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from hachoir.core.i18n import guessBytesCharset
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from hachoir.stream import InputIOStream, InputSubStream, InputStreamError
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def FileInputStream(filename, real_filename=None, **args):
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"""
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Create an input stream of a file. filename must be unicode or a file
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object.
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real_filename is an optional argument used to specify the real filename,
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its type can be 'str' or 'unicode'. Use real_filename when you are
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not able to convert filename to real unicode string (ie. you have to
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use unicode(name, 'replace') or unicode(name, 'ignore')).
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"""
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if not real_filename:
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real_filename = (filename if isinstance(filename, str)
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else getattr(filename, 'name', ''))
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try:
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if isinstance(filename, str):
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inputio = open(real_filename, 'rb')
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else:
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inputio = filename
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filename = getattr(filename, 'name', '')
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except IOError as err:
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errmsg = str(err)
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raise InputStreamError(
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"Unable to open file %s: %s" % (filename, errmsg))
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source = "file:" + filename
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offset = args.pop("offset", 0)
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size = args.pop("size", None)
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if offset or size:
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if size:
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size = 8 * size
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stream = InputIOStream(inputio, source=source, **args)
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return InputSubStream(stream, 8 * offset, size, **args)
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else:
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args.setdefault("tags", []).append(("filename", filename))
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return InputIOStream(inputio, source=source, **args)
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def guessStreamCharset(stream, address, size, default=None):
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size = min(size, 1024 * 8)
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bytes = stream.readBytes(address, size // 8)
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return guessBytesCharset(bytes, default)
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