66 lines
1.9 KiB
Python
66 lines
1.9 KiB
Python
import zipfile
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import numpy as np
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from . import errors
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from .segments import SegmentData, EmptySegment, ObjSegment
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from .diskimages import DiskImageBase
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from .utils import to_numpy
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import logging
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log = logging.getLogger(__name__)
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class MameZipImage(DiskImageBase):
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def __init__(self, rawdata, filename=""):
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self.zipdata = rawdata
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fh = self.zipdata.bufferedio
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if zipfile.is_zipfile(fh):
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with zipfile.ZipFile(fh) as zf:
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self.check_zip_size(zf)
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self.create_rawdata(zf)
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else:
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raise errors.InvalidDiskImage("Not a MAME zip file")
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DiskImageBase.__init__(self, self.rawdata, filename)
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def __str__(self):
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return "MAME Zip file, %d ROMs, orig_size=%d, uncompressed=%d" % (len(self.zip_segment_info), len(self.zipdata), len(self.rawdata))
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def setup(self):
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self.check_size()
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def strict_check(self):
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pass
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def relaxed_check(self):
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pass
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def check_zip_size(self, zf):
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for item in zf.infolist():
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_, r = divmod(item.file_size, 16)
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if r > 0:
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raise errors.InvalidDiskImage("zip entry not 16 byte multiple")
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def create_rawdata(self, zf):
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roms = []
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segment_info = []
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offset = 0
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for item in zf.infolist():
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rom = np.frombuffer(zf.open(item).read(), dtype=np.uint8)
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roms.append(rom)
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segment_info.append((offset, item.file_size, item.filename, item.CRC))
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offset += item.file_size
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data = np.concatenate(roms)
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self.zip_segment_info = segment_info
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self.rawdata = SegmentData(data)
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def check_size(self):
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pass
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def parse_segments(self):
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r = self.rawdata
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self.segments = []
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for offset, size, name, crc in self.zip_segment_info:
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end = offset + size
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self.segments.append(ObjSegment(r[offset:end], 0, offset, offset, end, name=name))
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