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84fff73c8f
Add stem-aware key encoding wrappers delegating to bintrie for identical SHA256 key derivation. Add packBasicData/packStorageValue matching bintrie's exact encoding layout. Stub trie.go with stemUpdate type pending Phase E implementation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
package nomttrie
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import (
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"encoding/binary"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/trie/bintrie"
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)
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// packBasicData encodes account metadata into a 32-byte value matching the
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// EIP-7864 basic data layout used by bintrie.UpdateAccount:
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//
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// [4:8] code size (uint32 big-endian)
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// [8:16] nonce (uint64 big-endian)
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// [16:32] balance (up to 16 bytes, right-aligned big-endian)
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func packBasicData(acc *types.StateAccount, codeLen int) [bintrie.HashSize]byte {
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var data [bintrie.HashSize]byte
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binary.BigEndian.PutUint32(data[bintrie.BasicDataCodeSizeOffset-1:], uint32(codeLen))
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binary.BigEndian.PutUint64(data[bintrie.BasicDataNonceOffset:], acc.Nonce)
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// Truncate balance to 16 bytes (matching bintrie behavior for devmode
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// accounts that exceed 128-bit balance).
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balanceBytes := acc.Balance.Bytes()
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if len(balanceBytes) > 16 {
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balanceBytes = balanceBytes[16:]
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}
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copy(data[bintrie.HashSize-len(balanceBytes):], balanceBytes)
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return data
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}
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// packStorageValue encodes a storage value into a 32-byte slot matching
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// bintrie.UpdateStorage: right-pad short values, truncate long values.
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func packStorageValue(value []byte) [bintrie.HashSize]byte {
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var v [bintrie.HashSize]byte
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if len(value) >= bintrie.HashSize {
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copy(v[:], value[:bintrie.HashSize])
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} else {
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copy(v[bintrie.HashSize-len(value):], value)
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}
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return v
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}
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