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Only write block to disk if checksum is okay

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Bobbi Webber-Manners 2020-06-11 16:53:14 -04:00
parent 3e343223af
commit 4514a815ae
1 changed files with 14 additions and 9 deletions
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23
veserver.py
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@ -121,15 +121,20 @@ def write(sock, addr, drive, d):
file = FILE2 file = FILE2
cs = 0 cs = 0
for i in range (0, BLKSZ):
cs ^= d[i+5]
err = False err = False
try: if cs == d[517]:
with open(file, 'r+b') as f: try:
f.seek(b) with open(file, 'r+b') as f:
for i in range (0, BLKSZ): f.seek(b)
f.write(bytes([d[i+5]])) for i in range (0, BLKSZ):
cs ^= d[i+5] f.write(bytes([d[i+5]]))
except: except:
err = True err = True # Write error
else:
err == True # Bad checksum
# Signal write errors by responding with bad data checksum. # Signal write errors by responding with bad data checksum.
# Use sender's checksum + 1, so there is never an inadvertent match. # Use sender's checksum + 1, so there is never an inadvertent match.
@ -148,7 +153,7 @@ def write(sock, addr, drive, d):
#print('Sent {} bytes to {}'.format(b, addr)) #print('Sent {} bytes to {}'.format(b, addr))
print("VEServer v0.6 alpha") print("VEServer v0.7 alpha")
if pd25: if pd25:
print("ProDOS 2.5+ Clock Driver") print("ProDOS 2.5+ Clock Driver")
else: else: