mirror of
https://github.com/SickGear/SickGear.git
synced 2024-11-28 15:43:37 +00:00
251 lines
8.9 KiB
Python
251 lines
8.9 KiB
Python
from hachoir.stream import InputSubStream
|
|
from hachoir.core.tools import humanFilesize, humanDuration
|
|
from hachoir.core.memory import limitedMemory
|
|
from hachoir.subfile.data_rate import DataRate
|
|
from hachoir.subfile.output import Output
|
|
from hachoir.subfile.pattern import HachoirPatternMatching as PatternMatching
|
|
from sys import stderr
|
|
from time import time
|
|
|
|
|
|
def skipSubfile(parser):
|
|
subfile = parser.getParserTags().get("subfile", "")
|
|
return (subfile == "skip")
|
|
|
|
|
|
FILE_MAX_SIZE = 100 * 1024 * 1024 # Max. file size in bytes (100 MB)
|
|
SLICE_SIZE = 64 * 1024 # Slice size in bytes (64 KB)
|
|
MEMORY_LIMIT = 50 * 1024 * 1024
|
|
PROGRESS_UPDATE = 1.5 # Minimum number of second between two progress messages
|
|
|
|
|
|
class SearchSubfile:
|
|
"""
|
|
Tool to find file start and file size in any binary stream.
|
|
|
|
To use it:
|
|
- instanciate the class: subfile = SearchSubfile()
|
|
- (optional) choose magics with: subfile.loadMagics(categories, parser_ids)
|
|
- run the search: subfile.main()
|
|
"""
|
|
|
|
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
|
|
|
|
def setOutput(self, directory):
|
|
self.output = Output(directory)
|
|
|
|
def loadParsers(self, categories=None, parser_ids=None):
|
|
before = time()
|
|
self.patterns = PatternMatching(categories, parser_ids)
|
|
if self.debug:
|
|
print("Regex compilation: %.1f ms" % ((time() - before) * 1000))
|
|
print("Use regex: %s" % self.patterns)
|
|
|
|
def main(self):
|
|
"""
|
|
Run the search.
|
|
Return True if ok, False otherwise.
|
|
"""
|
|
|
|
# Initialize
|
|
self.mainHeader()
|
|
|
|
# Prepare search
|
|
main_error = False
|
|
try:
|
|
# Run search
|
|
limitedMemory(MEMORY_LIMIT, self.searchSubfiles)
|
|
except KeyboardInterrupt:
|
|
print("[!] Program interrupted (CTRL+C)", file=stderr)
|
|
main_error = True
|
|
except MemoryError:
|
|
main_error = True
|
|
print("[!] Memory error!", file=stderr)
|
|
self.mainFooter()
|
|
self.stream.close()
|
|
return (not main_error)
|
|
|
|
def mainHeader(self):
|
|
# Fix slice size if needed
|
|
self.slice_size = max(self.slice_size, self.patterns.max_length * 8)
|
|
|
|
# Load parsers if none has been choosen
|
|
if not self.patterns:
|
|
self.loadParsers()
|
|
|
|
bytes = (self.size - self.start_offset) // 8
|
|
print("[+] Start search on %s bytes (%s)" % (
|
|
bytes, humanFilesize(bytes)), file=stderr)
|
|
print(file=stderr)
|
|
self.stats = {}
|
|
self.current_offset = self.start_offset
|
|
self.main_start = time()
|
|
|
|
def mainFooter(self):
|
|
print(file=stderr)
|
|
print("[+] End of search -- offset=%s (%s)" % (
|
|
self.current_offset // 8, humanFilesize(self.current_offset // 8)), file=stderr)
|
|
size = (self.current_offset - self.start_offset) // 8
|
|
duration = time() - self.main_start
|
|
if 0.1 <= duration:
|
|
print("Total time: %s -- global rate: %s/sec" % (
|
|
humanDuration(duration * 1000), humanFilesize(size // duration)), file=stderr)
|
|
|
|
def searchSubfiles(self):
|
|
"""
|
|
Search all subfiles in the stream, call processParser() for each parser.
|
|
"""
|
|
self.next_offset = None
|
|
self.next_progress = time() + PROGRESS_UPDATE
|
|
while self.current_offset < self.size:
|
|
self.datarate.update(self.current_offset)
|
|
if self.verbose and self.next_progress <= time():
|
|
self.displayProgress()
|
|
for offset, parser in self.findMagic(self.current_offset):
|
|
self.processParser(offset, parser)
|
|
self.current_offset += self.slice_size
|
|
if self.next_offset:
|
|
self.current_offset = max(
|
|
self.current_offset, self.next_offset)
|
|
self.current_offset = min(self.current_offset, self.size)
|
|
|
|
def processParser(self, offset, parser):
|
|
"""
|
|
Process a valid parser.
|
|
"""
|
|
text = "[+] File at %s" % (offset // 8)
|
|
if parser.content_size is not None:
|
|
text += " size=%s (%s)" % (parser.content_size //
|
|
8, humanFilesize(parser.content_size // 8))
|
|
if not parser.content_size or parser.content_size // 8 < FILE_MAX_SIZE:
|
|
text += ": " + parser.description
|
|
else:
|
|
text += ": " + parser.__class__.__name__
|
|
|
|
if self.output and parser.content_size:
|
|
if (offset == 0 and parser.content_size == self.size):
|
|
text += " (don't copy whole file)"
|
|
elif parser.content_size // 8 >= FILE_MAX_SIZE:
|
|
text += " (don't copy file, too big)"
|
|
elif not self.filter or self.filter(parser):
|
|
filename = self.output.createFilename(parser.filename_suffix)
|
|
filename = self.output.writeFile(
|
|
filename, self.stream, offset, parser.content_size)
|
|
text += " => %s" % filename
|
|
print(text)
|
|
self.next_progress = time() + PROGRESS_UPDATE
|
|
|
|
def findMagic(self, offset):
|
|
"""
|
|
Find all 'magic_str' strings in stream in offset interval:
|
|
offset..(offset+self.slice_size).
|
|
|
|
The function returns a generator with values (offset, parser) where
|
|
offset is beginning of a file (relative to stream begin), and not the
|
|
position of the magic.
|
|
"""
|
|
start = offset
|
|
end = start + self.slice_size
|
|
end = min(end, self.size)
|
|
data = self.stream.readBytes(start, (end - start) // 8)
|
|
for parser_cls, offset in self.patterns.search(data):
|
|
offset += start
|
|
# Skip invalid offset
|
|
if offset < 0:
|
|
continue
|
|
if self.next_offset and offset < self.next_offset:
|
|
continue
|
|
|
|
# Create parser at found offset
|
|
parser = self.guess(offset, parser_cls)
|
|
|
|
# Update statistics
|
|
if parser_cls not in self.stats:
|
|
self.stats[parser_cls] = [0, 0]
|
|
self.stats[parser_cls][0] += 1
|
|
if not parser:
|
|
continue
|
|
|
|
# Parser is valid, yield it with the offset
|
|
self.stats[parser_cls][1] += 1
|
|
|
|
if self.debug:
|
|
print("Found %s at offset %s" % (
|
|
parser.__class__.__name__, offset // 8), file=stderr)
|
|
yield (offset, parser)
|
|
|
|
# Set next offset
|
|
if parser.content_size is not None\
|
|
and skipSubfile(parser):
|
|
self.next_offset = offset + parser.content_size
|
|
if end <= self.next_offset:
|
|
break
|
|
|
|
def guess(self, offset, parser_cls):
|
|
"""
|
|
Try the specified parser at stream offset 'offset'.
|
|
|
|
Return the parser object, or None on failure.
|
|
"""
|
|
substream = InputSubStream(self.stream, offset)
|
|
try:
|
|
return parser_cls(substream, validate=True)
|
|
except Exception:
|
|
return None
|
|
|
|
def displayProgress(self):
|
|
"""
|
|
Display progress (to stdout) of the whole process.
|
|
Compute data rate (in byte per sec) and time estimation.
|
|
"""
|
|
# Program next update
|
|
self.next_progress = time() + PROGRESS_UPDATE
|
|
|
|
# Progress offset
|
|
percent = float(self.current_offset - self.start_offset) * \
|
|
100 / (self.size - self.start_offset)
|
|
offset = self.current_offset // 8
|
|
message = "Search: %.2f%% -- offset=%u (%s)" % (
|
|
percent, offset, humanFilesize(offset))
|
|
|
|
# Compute data rate (byte/sec)
|
|
average = self.datarate.average
|
|
if average:
|
|
message += " -- %s/sec " % humanFilesize(average // 8)
|
|
eta = float(self.size - self.current_offset) / average
|
|
message += " -- ETA: %s" % humanDuration(eta * 1000)
|
|
|
|
# Display message
|
|
print(message, file=stderr)
|