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79 lines
2.6 KiB
Python
79 lines
2.6 KiB
Python
from hachoir.field import Bytes
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from hachoir.core.tools import makePrintable, humanFilesize
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from hachoir.stream import InputIOStream
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class SubFile(Bytes):
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"""
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File stored in another file
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"""
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def __init__(self, parent, name, length, description=None,
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parser=None, filename=None, mime_type=None, parser_class=None):
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if filename:
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if not isinstance(filename, str):
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filename = makePrintable(filename, "ISO-8859-1")
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if not description:
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description = 'File "%s" (%s)' % (
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filename, humanFilesize(length))
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Bytes.__init__(self, parent, name, length, description)
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def createInputStream(cis, **args):
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tags = args.setdefault("tags", [])
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if parser_class:
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tags.append(("class", parser_class))
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if parser is not None:
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tags.append(("id", parser.PARSER_TAGS["id"]))
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if mime_type:
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tags.append(("mime", mime_type))
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if filename:
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tags.append(("filename", filename))
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return cis(**args)
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self.setSubIStream(createInputStream)
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class CompressedStream:
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offset = 0
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def __init__(self, stream, decompressor):
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self.stream = stream
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self.decompressor = decompressor(stream)
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self._buffer = b''
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def read(self, size):
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d = self._buffer
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data = [d[:size]]
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size -= len(d)
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if size > 0:
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d = self.decompressor(size)
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data.append(d[:size])
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size -= len(d)
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while size > 0:
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n = 4096
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if self.stream.size:
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n = min(self.stream.size - self.offset, n)
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if not n:
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break
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d = self.stream.read(self.offset, n)[1]
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self.offset += 8 * len(d)
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d = self.decompressor(size, d)
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data.append(d[:size])
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size -= len(d)
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self._buffer = d[size + len(d):]
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return b''.join(data)
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def CompressedField(field, decompressor):
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def createInputStream(cis, source=None, **args):
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if field._parent:
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stream = cis(source=source)
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args.setdefault("tags", []).extend(stream.tags)
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else:
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stream = field.stream
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input = CompressedStream(stream, decompressor)
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if source is None:
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source = "Compressed source: '%s' (offset=%s)" % (
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stream.source, field.absolute_address)
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return InputIOStream(input, source=source, **args)
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field.setSubIStream(createInputStream)
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return field
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