100 lines
2.9 KiB
Python
100 lines
2.9 KiB
Python
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#!/usr/bin/env python3
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#
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# Cross Platform and Multi Architecture Advanced Binary Emulation Framework
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#
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from .mapper import QlFsMappedObject
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# Open a file as a Disk
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# host_path: The file path on the host machine.
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# drive_path: The drive path on the emulated system. e.g. /dev/sda \\.\PHYSICALDRIVE0 0x80
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#
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# Note: CHS and LBA support is very limited since a raw file doesn't contain enough information.
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# We simply assume that it is a disk with 1 head, 1 cylinder and (filesize/512) sectors.
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# See: https://en.wikipedia.org/wiki/Cylinder-head-sector
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# https://en.wikipedia.org/wiki/Logical_block_addressing
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# http://www.uruk.org/orig-grub/PC_partitioning.txt
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class QlDisk(QlFsMappedObject):
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def __init__(self, host_path, drive_path, n_heads=1, n_cylinders=1, sector_size=512):
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self._host_path = host_path
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self._drive_path = drive_path
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self._fp = open(host_path, "rb+")
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self._n_heads = n_heads
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self._n_cylinders = n_cylinders
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self._sector_size = sector_size
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self.lseek(0, 2)
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self._filesize = self.tell()
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self._n_sectors = (self._filesize - 1)// self.sector_size + 1
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def __del__(self):
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if not self.fp.closed:
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self.fp.close()
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@property
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def filesize(self):
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return self._filesize
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@property
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def n_heads(self):
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return self._n_heads
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@property
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def n_sectors(self):
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return self._n_sectors
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@property
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def n_cylinders(self):
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return self._n_cylinders
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@property
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def sector_size(self):
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return self._sector_size
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@property
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def host_path(self):
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return self._host_path
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@property
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def drive_path(self):
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return self._drive_path
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@property
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def fp(self):
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return self._fp
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# Methods from FsMappedObject
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def read(self, l):
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return self.fp.read(l)
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def write(self, bs):
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return self.fp.write(bs)
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def lseek(self, offset, origin):
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return self.fp.seek(offset, origin)
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def tell(self):
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return self.fp.tell()
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def close(self):
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return self.fp.close()
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# Methods for QlDisk
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def lba(self, cylinder, head, sector):
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return (cylinder * self.n_heads + head) * self._n_sectors + sector - 1
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def read_sectors(self, lba, cnt):
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self.lseek(self.sector_size * lba, 0)
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return self.read(self.sector_size*cnt)
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def read_chs(self, cylinder, head, sector, cnt):
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return self.read_sectors(self.lba(cylinder, head, sector), cnt)
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def write_sectors(self, lba, cnt, buffer):
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if len(buffer) > self.sector_size * cnt:
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buffer = buffer[:self.sector_size*cnt]
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self.lseek(self.sector_size * lba, 0)
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return self.write(buffer)
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def write_chs(self, cylinder, head, sector, cnt, buffer):
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return self.write_sectors(self.lba(cylinder, head, sector), cnt, buffer)
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