morgan/python-bzz
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Morgan Kelley
2025-09-15 23:52:32 -06:00
parent aff1cc77f7
commit 3ac0cefe19
1 changed files with 12 additions and 5 deletions
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17
main.py
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@@ -59,15 +59,15 @@ class BZZCompressor:
print(f"Len Table: {len_table}")
print(f"Num Flags: {num_flags.tobytes()}")
# Adding 0x100 here means the bitarray is a length of 9, and the first item is always 1
# This means that later, when we need to gather more flag bits, we aren't losing any data, or
# hitting an index out of bounds error
flag_bits = bitarray(bin(int(data[0:8].to01(), 2) + 0x100)[2:])
del data[0:8]
print(f"Starting flag_bits: {flag_bits.tobytes()}")
hold_val = b""
print(f"Starting flag_bits: {flag_bits}")
while int(num_flags.to01(), 2) > 0:
# Any time we reset the flag_bits, it's length is 9 digits. So we shift right and trim.
# Otherwise, we just shift right
carry = flag_bits[-1]
flag_bits = flag_bits >> 1
@@ -77,11 +77,14 @@ class BZZCompressor:
print(f"Carry: {carry}")
print(f"Flag Bits: {flag_bits}")
if int(flag_bits.to01(), 2) == 0:
# if we are down to only 0 bits, we are out of file-driven data
# Here we collect more flag bits and re-iterate the loop
if len(flag_bits.to01()) == 0:
flag_bits = bitarray(bin(int(data[0:8].to01(), 2) + 0x100)[2:])
del data[0:8]
continue
# Carry means the next byte is raw data, no weird placement or indexing
if carry:
if len(data) == 0:
print("Error processing file. Reached of data stream early.")
@@ -89,11 +92,15 @@ class BZZCompressor:
output_buffer.append(data[0:8])
del data[0:8]
# If Carry is 0, then we are doing actual decompression. This is the tricky part
else:
# This shouldn't happen
if len(data) <= 8:
print("Error processing file. Reached of data stream early.")
return
# This is "temp" in our documentation
distance_data = data[0:16]
del data[0:16]