Macintosh-Tools/machfs
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API: add 'sparse' option to Volume.write()

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This will cause it to return a (bytes, num_free_bytes, bytes) tuple.
This commit is contained in:
Elliot Nunn 2018-12-10 16:07:34 +08:00
parent 1362dab2c0
commit eb61c947de
1 changed files with 15 additions and 6 deletions
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21
machfs/main.py
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@ -218,7 +218,7 @@ class Volume(AbstractFolder):
self.pop('Desktop DB', None)
self.pop('Desktop DF', None)
def write(self, size=800*1024, align=512, desktopdb=True, bootable=True, startapp=None):
def write(self, size=800*1024, align=512, desktopdb=True, bootable=True, startapp=None, sparse=False):
if align < 512 or align % 512:
raise ValueError('align must be multiple of 512')
@ -459,8 +459,17 @@ class Volume(AbstractFolder):
vib += bytes(512-len(vib))
assert all(len(x) == drAlBlkSiz for x in blkaccum)
finalchunks = [bootblocks, vib, bitmap, *blkaccum]
finalchunks.append(bytes(size - sum(len(x) for x in finalchunks) - 2*512))
finalchunks.append(vib)
finalchunks.append(bytes(512))
return b''.join(finalchunks)
left_elements = [bootblocks, vib, bitmap, *blkaccum]
unused_offset = sum(len(x) for x in left_elements)
unused_length = size - unused_offset - 2*512
right_elements = [vib, bytes(512)]
if sparse:
return b''.join(left_elements), unused_length, b''.join(right_elements)
else:
all_elements = left_elements
all_elements.append(bytes(unused_length))
all_elements.extend(right_elements)
return b''.join(all_elements)