// Copyright (c) 2018-2023, The Monero Project // // All rights reserved. // // Redistribution and use in source and binary forms, with or without modification, are // permitted provided that the following conditions are met: // // 1. Redistributions of source code must retain the above copyright notice, this list of // conditions and the following disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright notice, this list // of conditions and the following disclaimer in the documentation and/or other // materials provided with the distribution. // // 3. Neither the name of the copyright holder nor the names of its contributors may be // used to endorse or promote products derived from this software without specific // prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include "cryptonote_config.h" #include "misc_log_ex.h" #include "crypto/crypto.h" #include "pruning.h" namespace tools { uint32_t make_pruning_seed(uint32_t stripe, uint32_t log_stripes) { CHECK_AND_ASSERT_THROW_MES(log_stripes <= PRUNING_SEED_LOG_STRIPES_MASK, "log_stripes out of range"); CHECK_AND_ASSERT_THROW_MES(stripe > 0 && stripe <= (1ul << log_stripes), "stripe out of range"); return (log_stripes << PRUNING_SEED_LOG_STRIPES_SHIFT) | ((stripe - 1) << PRUNING_SEED_STRIPE_SHIFT); } bool has_unpruned_block(uint64_t block_height, uint64_t blockchain_height, uint32_t pruning_seed) { const uint32_t stripe = get_pruning_stripe(pruning_seed); if (stripe == 0) return true; const uint32_t log_stripes = get_pruning_log_stripes(pruning_seed); uint32_t block_stripe = get_pruning_stripe(block_height, blockchain_height, log_stripes); return block_stripe == 0 || block_stripe == stripe; } uint32_t get_pruning_stripe(uint64_t block_height, uint64_t blockchain_height, uint32_t log_stripes) { if (block_height + CRYPTONOTE_PRUNING_TIP_BLOCKS >= blockchain_height) return 0; return ((block_height / CRYPTONOTE_PRUNING_STRIPE_SIZE) & (uint64_t)((1ul << log_stripes) - 1)) + 1; } uint32_t get_pruning_seed(uint64_t block_height, uint64_t blockchain_height, uint32_t log_stripes) { const uint32_t stripe = get_pruning_stripe(block_height, blockchain_height, log_stripes); if (stripe == 0) return 0; return make_pruning_seed(stripe, log_stripes); } uint64_t get_next_unpruned_block_height(uint64_t block_height, uint64_t blockchain_height, uint32_t pruning_seed) { CHECK_AND_ASSERT_MES(block_height <= CRYPTONOTE_MAX_BLOCK_NUMBER+1, block_height, "block_height too large"); CHECK_AND_ASSERT_MES(blockchain_height <= CRYPTONOTE_MAX_BLOCK_NUMBER+1, block_height, "blockchain_height too large"); const uint32_t stripe = get_pruning_stripe(pruning_seed); if (stripe == 0) return block_height; if (block_height + CRYPTONOTE_PRUNING_TIP_BLOCKS >= blockchain_height) return block_height; const uint32_t seed_log_stripes = get_pruning_log_stripes(pruning_seed); const uint64_t log_stripes = seed_log_stripes ? seed_log_stripes : CRYPTONOTE_PRUNING_LOG_STRIPES; const uint64_t mask = (1ul << log_stripes) - 1; const uint32_t block_pruning_stripe = ((block_height / CRYPTONOTE_PRUNING_STRIPE_SIZE) & mask) + 1; if (block_pruning_stripe == stripe) return block_height; const uint64_t cycles = ((block_height / CRYPTONOTE_PRUNING_STRIPE_SIZE) >> log_stripes); const uint64_t cycle_start = cycles + ((stripe > block_pruning_stripe) ? 0 : 1); const uint64_t h = cycle_start * (CRYPTONOTE_PRUNING_STRIPE_SIZE << log_stripes) + (stripe - 1) * CRYPTONOTE_PRUNING_STRIPE_SIZE; if (h + CRYPTONOTE_PRUNING_TIP_BLOCKS > blockchain_height) return blockchain_height < CRYPTONOTE_PRUNING_TIP_BLOCKS ? 0 : blockchain_height - CRYPTONOTE_PRUNING_TIP_BLOCKS; CHECK_AND_ASSERT_MES(h >= block_height, block_height, "h < block_height, unexpected"); return h; } uint64_t get_next_pruned_block_height(uint64_t block_height, uint64_t blockchain_height, uint32_t pruning_seed) { const uint32_t stripe = get_pruning_stripe(pruning_seed); if (stripe == 0) return blockchain_height; if (block_height + CRYPTONOTE_PRUNING_TIP_BLOCKS >= blockchain_height) return blockchain_height; const uint32_t seed_log_stripes = get_pruning_log_stripes(pruning_seed); const uint64_t log_stripes = seed_log_stripes ? seed_log_stripes : CRYPTONOTE_PRUNING_LOG_STRIPES; const uint64_t mask = (1ul << log_stripes) - 1; const uint32_t block_pruning_seed = ((block_height / CRYPTONOTE_PRUNING_STRIPE_SIZE) & mask) + 1; if (block_pruning_seed != stripe) return block_height; const uint32_t next_stripe = 1 + (block_pruning_seed & mask); return get_next_unpruned_block_height(block_height, blockchain_height, tools::make_pruning_seed(next_stripe, log_stripes)); } uint32_t get_random_stripe() { return 1 + crypto::rand() % (1ul << CRYPTONOTE_PRUNING_LOG_STRIPES); } }