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tools: spiffsgen.py: avoid reallocating byte array for each new block

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On large filesystems (~15 MB), this reduces execution time from
11s to 0.3s.
This commit is contained in:
Ivan Grokhotkov 2021-03-22 21:11:36 +01:00
parent ad1606ae1d
commit 930ee51b8f
1 changed files with 5 additions and 3 deletions
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8
components/spiffs/spiffsgen.py
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@ -448,19 +448,21 @@ class SpiffsFS():
def to_binary(self):
img = b''
all_blocks = []
for block in self.blocks:
img += block.to_binary(self.blocks_lim)
all_blocks.append(block.to_binary(self.blocks_lim))
bix = len(self.blocks)
if self.build_config.use_magic:
# Create empty blocks with magic numbers
while self.remaining_blocks > 0:
block = SpiffsBlock(bix, self.blocks_lim, self.build_config)
img += block.to_binary(self.blocks_lim)
all_blocks.append(block.to_binary(self.blocks_lim))
self.remaining_blocks -= 1
bix += 1
else:
# Just fill remaining spaces FF's
img += '\xFF' * (self.img_size - len(img))
all_blocks.append(b'\xFF' * (self.img_size - len(img)))
img += b''.join([blk for blk in all_blocks])
return img