def __init__(self, stream, offset=0, size=None):
"""
Setup search tool, parameter:
- filename: Input filename in locale charset
- directory: Directory filename in locale charset where
output files will be written
- offset: Offset (in bytes) of the beginning of the search
- size: Limit size (in bytes) of input file (None: no limit)
- debug: Debug mode flag (display debug information)
"""
# Size
self.stream = stream
if size is not None:
self.size = min(self.stream.size, (offset + size) * 8)
else:
self.size = self.stream.size
# Offset
self.start_offset = offset * 8
self.current_offset = self.start_offset
self.slice_size = SLICE_SIZE * 8 # 64 KB (in bits)
# Statistics
self.datarate = DataRate(self.start_offset)
self.main_start = time()
# Other flags and attributes
self.patterns = None
self.verbose = True
self.debug = False
self.output = None
self.filter = None
