86 lines
2.3 KiB
Python
86 lines
2.3 KiB
Python
def compress_fri(prf):
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o = []
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def add_obj(x):
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if x in o:
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o.append(o.index(x).to_bytes(2, 'big'))
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else:
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o.append(x)
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for root, yproofs in prf[:-1]:
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# print('Adding proof item, pos %d' % len(o))
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add_obj(b'----')
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add_obj(root)
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for yproof in yproofs:
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for branch in yproof:
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for p in branch:
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add_obj(p)
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add_obj(b'++++')
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add_obj(b'====')
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# print('Adding final proof, pos %d' % len(o))
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add_obj(b'////')
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for x in prf[-1]:
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add_obj(x)
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assert decompress_fri(o) == prf
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return o
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def decompress_fri(proof):
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def get_obj(pos):
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return proof[int.from_bytes(proof[pos], 'big')] if len(proof[pos]) == 2 else proof[pos]
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o = []
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pos = 0
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while proof[pos] != b'////':
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# print("Processing proof item", pos)
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assert get_obj(pos) == b'----'
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root = get_obj(pos + 1)
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pos += 2
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yproofs = []
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while get_obj(pos) not in (b'----', b'////'):
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yproof = []
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while get_obj(pos) != b'====':
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branch = []
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while get_obj(pos) != b'++++':
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branch.append(get_obj(pos))
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pos += 1
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yproof.append(branch)
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pos += 1
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yproofs.append(yproof)
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pos += 1
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o.append([root, yproofs])
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# print('Processing final proof, pos %d' % pos)
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pos += 1
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o.append([get_obj(x) for x in range(pos, len(proof))])
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return o
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def compress_branches(branches):
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o = []
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def add_obj(x):
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if x in o:
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o.append(o.index(x).to_bytes(2, 'big'))
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else:
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o.append(x)
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for branch in branches:
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for p in branch:
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add_obj(p)
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add_obj(b'----')
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assert decompress_branches(o) == branches
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return o
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def decompress_branches(proof):
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def get_obj(pos):
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return proof[int.from_bytes(proof[pos], 'big')] if len(proof[pos]) == 2 else proof[pos]
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o = []
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pos = 0
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while pos < len(proof):
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branch = []
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while pos < len(proof) and get_obj(pos) != b'----':
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branch.append(get_obj(pos))
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pos += 1
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o.append(branch)
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pos += 1
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return o
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def bin_length(c):
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return len(b''.join([(b'\xff' if len(x) == 32 else b'') + x for x in c]))
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