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# Tests where the block device returns invalid values
try:
import vfs
vfs.VfsFat
vfs.VfsLfs2
except (ImportError, AttributeError):
print("SKIP")
raise SystemExit
class RAMBlockDevice:
ERASE_BLOCK_SIZE = 512
def __init__(self, blocks):
self.data = bytearray(blocks * self.ERASE_BLOCK_SIZE)
self.read_res = 0
self.write_res = 0
def readblocks(self, block, buf, off=0):
# print("readblocks", block, len(buf), off)
addr = block * self.ERASE_BLOCK_SIZE + off
for i in range(len(buf)):
buf[i] = self.data[addr + i]
return self.read_res
def writeblocks(self, block, buf, off=None):
if off is None:
# erase, then write
off = 0
addr = block * self.ERASE_BLOCK_SIZE + off
for i in range(len(buf)):
self.data[addr + i] = buf[i]
return self.write_res
def ioctl(self, op, arg):
if op == 4: # block count
return len(self.data) // self.ERASE_BLOCK_SIZE
if op == 5: # block size
return self.ERASE_BLOCK_SIZE
if op == 6: # erase block
return 0
try:
bdev = RAMBlockDevice(50)
except MemoryError:
print("SKIP")
raise SystemExit
def test(vfs_class):
print(vfs_class)
bdev.read_res = 0 # reset function results
bdev.write_res = 0
vfs_class.mkfs(bdev)
fs = vfs_class(bdev)
with fs.open("test", "w") as f:
f.write("a" * 64)
for res in (0, -5, 5, 33, "invalid"):
# -5 is a legitimate negative failure (EIO), positive integer
# is not
# This variant will fail on open
bdev.read_res = res
try:
with fs.open("test", "r") as f:
print("opened")
except OSError as e:
print("OSError", e)
# This variant should succeed on open, may fail on read
# unless the filesystem cached the contents already
bdev.read_res = 0
try:
with fs.open("test", "r") as f:
bdev.read_res = res
print("read 1", f.read(1))
print("read rest", f.read())
except OSError as e:
print("OSError", e)
test(vfs.VfsLfs2)
test(vfs.VfsFat)
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