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Floor disk_count at zero.

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This commit is contained in:
Neil Booth 2016-11-19 20:54:40 +09:00
parent ccf24fdc71
commit 8617c82ec2
2 changed files with 2 additions and 1 deletions
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2
server/block_processor.py
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@ -828,7 +828,7 @@ class BlockProcessor(server.db.DB):
def read_headers(self, start, count): def read_headers(self, start, count):
# Read some from disk # Read some from disk
disk_count = min(count, self.fs_height + 1 - start) disk_count = min(count, max(0, self.fs_height + 1 - start))
result = self.fs_read_headers(start, disk_count) result = self.fs_read_headers(start, disk_count)
count -= disk_count count -= disk_count
start += disk_count start += disk_count

1
server/db.py
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@ -143,6 +143,7 @@ class DB(LoggedClass):
raise raise
def fs_read_headers(self, start, count): def fs_read_headers(self, start, count):
'''Requires count >= 0.'''
# Read some from disk # Read some from disk
disk_count = min(count, self.db_height + 1 - start) disk_count = min(count, self.db_height + 1 - start)
if start < 0 or count < 0 or disk_count != count: if start < 0 or count < 0 or disk_count != count: