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fix: wrong part_size calculation (misses 1 sector)

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IRC excerpt:
[12-20 15:20]  <steadfasterX> i have a partition: end=378879 start=377856
[12-20 15:21]  <steadfasterX> so the calcluation would be 378879-377856
[12-20 15:21]  <steadfasterX> which is 1023
[12-20 15:21]  <steadfasterX> which can never be correct
[12-20 15:22]  <steadfasterX> this is bc in the calculation it will need to include the start (or end) sector itself
[12-20 15:23]  <steadfasterX> when i dump without that +1 i miss exact 512 bytes so 1 sector
This commit is contained in:
steadfasterX 2017-12-21 19:11:03 +01:00
parent b9ade65d48
commit 6def07a75f
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GPG key ID: D97F436B1A616F5D
2 changed files with 2 additions and 2 deletions
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2
extract-partitions.py
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@ -26,7 +26,7 @@ def dump_partitions(comm, disk_fd, outdir, max_size):
diskinfo = partitions.get_partitions(comm, disk_fd) diskinfo = partitions.get_partitions(comm, disk_fd)
for part in diskinfo.gpt.partitions: for part in diskinfo.gpt.partitions:
part_offset = part.first_lba * partitions.BLOCK_SIZE part_offset = part.first_lba * partitions.BLOCK_SIZE
part_size = (part.last_lba - part.first_lba) * partitions.BLOCK_SIZE part_size = (part.last_lba - (part.first_lba - 1)) * partitions.BLOCK_SIZE
part_name = part.name part_name = part.name
part_label = "/dev/mmcblk0p%i" % part.index part_label = "/dev/mmcblk0p%i" % part.index
if max_size and part_size > max_size: if max_size and part_size > max_size:

2
partitions.py
View file

@ -259,7 +259,7 @@ def main():
_logger.debug("%s", info) _logger.debug("%s", info)
part_offset = part.first_lba * BLOCK_SIZE part_offset = part.first_lba * BLOCK_SIZE
part_size = (part.last_lba - part.first_lba) * BLOCK_SIZE part_size = (part.last_lba - (part.first_lba - 1)) * BLOCK_SIZE
_logger.debug("Opened fd %d for disk", disk_fd) _logger.debug("Opened fd %d for disk", disk_fd)
if args.dump: if args.dump: