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012bec0eb1
The compact LSB-aligned encoding via ActiveBytes packed paths into ceil(len/8) bytes without recording the bit-length. Two distinct paths whose bit-lengths fell in the same byte-bucket and whose integer values matched produced identical bytes — e.g. the 1-bit path "1" and the 8-bit path "00000001" both encoded to [0x01], so two stems sitting at depths 1 and 8 on different branches could clobber each other in nodeset.AddNode. Replace ActiveBytes/PutActiveBytes with KeyBytes/PutKeyBytes, which append a uint8 bit-length byte after the active bytes. Postpend (rather than prepend) so nodes along a single root-to-leaf descent share leading path bytes, improving LSM block locality during traversal. The empty path is encoded as no bytes (not [0x00]): byteCount=0 is unique to len=0 so no disambiguation byte is needed. This keeps the root's DB key empty, matching the resolver's existing nil-path convention.
43 lines
1.5 KiB
Go
43 lines
1.5 KiB
Go
// Copyright 2025 go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package bintrie
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import (
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"errors"
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"github.com/ethereum/go-ethereum/common"
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)
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func keyToPath(depth int, key []byte) ([]byte, error) {
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if depth >= 31*8 {
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return nil, errors.New("node too deep")
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}
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keyLen := min(len(key), 31)
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ba := new(BitArray).SetBytes(uint8(keyLen*8), key[:keyLen])
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path := new(BitArray).MSBs(ba, uint8(depth+1))
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return path.KeyBytes(), nil
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}
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// Invariant: dirty=false implies mustRecompute=false. Every mutation that
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// invalidates the cached hash MUST also mark the blob for re-flush.
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type InternalNode struct {
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left, right nodeRef
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depth uint8
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mustRecompute bool // hash is stale (cleared by Hash)
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dirty bool // on-disk blob is stale (cleared by CollectNodes)
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hash common.Hash
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}
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