diff options
Diffstat (limited to 'src/crypto/isa-l/isa-l_crypto/rolling_hash/rolling_hash2.c')
| -rw-r--r-- | src/crypto/isa-l/isa-l_crypto/rolling_hash/rolling_hash2.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/crypto/isa-l/isa-l_crypto/rolling_hash/rolling_hash2.c b/src/crypto/isa-l/isa-l_crypto/rolling_hash/rolling_hash2.c new file mode 100644 index 000000000..4b066e40f --- /dev/null +++ b/src/crypto/isa-l/isa-l_crypto/rolling_hash/rolling_hash2.c @@ -0,0 +1,169 @@ +/********************************************************************** + Copyright(c) 2011-2017 Intel Corporation All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * 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. + * Neither the name of Intel Corporation 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 + OWNER 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 <stdlib.h> +#include <string.h> +#include "rolling_hashx.h" +#include "rolling_hash2_table.h" + +extern +uint64_t rolling_hash2_run_until(uint32_t * idx, int max_idx, uint64_t * t1, + uint64_t * t2, uint8_t * b1, uint8_t * b2, uint64_t h, + uint64_t mask, uint64_t trigger); + +int rolling_hash2_init(struct rh_state2 *state, uint32_t w) +{ + uint32_t i; + uint64_t v; + + if (w > FINGERPRINT_MAX_WINDOW) + return -1; + + for (i = 0; i < 256; i++) { + v = rolling_hash2_table1[i]; + state->table1[i] = v; + state->table2[i] = (v << w) | (v >> (64 - w)); + } + state->w = w; + return 0; +} + +void rolling_hash2_reset(struct rh_state2 *state, uint8_t * init_bytes) +{ + uint64_t hash; + uint32_t i, w; + + hash = 0; + w = state->w; + for (i = 0; i < w; i++) { + hash = (hash << 1) | (hash >> (64 - 1)); + hash ^= state->table1[init_bytes[i]]; + } + state->hash = hash; + memcpy(state->history, init_bytes, w); +} + +static +uint64_t hash_fn(struct rh_state2 *state, uint64_t h, uint8_t new_char, uint8_t old_char) +{ + h = (h << 1) | (h >> (64 - 1)); + h ^= state->table1[new_char] ^ state->table2[old_char]; + return h; +} + +uint64_t rolling_hash2_run_until_base(uint32_t * idx, int max_idx, uint64_t * t1, + uint64_t * t2, uint8_t * b1, uint8_t * b2, uint64_t h, + uint64_t mask, uint64_t trigger) +{ + int i = *idx; + + if (trigger == 0) { + for (; i < max_idx; i++) { + h = (h << 1) | (h >> (64 - 1)); + h ^= t1[b1[i]] ^ t2[b2[i]]; + if ((h & mask) == 0) { + *idx = i; + return h; + } + } + } else { + for (; i < max_idx; i++) { + h = (h << 1) | (h >> (64 - 1)); + h ^= t1[b1[i]] ^ t2[b2[i]]; + if ((h & mask) == trigger) { + *idx = i; + return h; + } + } + } + *idx = i; + return h; +} + +int +rolling_hash2_run(struct rh_state2 *state, uint8_t * buffer, uint32_t buffer_length, + uint32_t mask, uint32_t trigger, uint32_t * offset) +{ + + uint32_t i; + uint32_t w = state->w; + uint64_t hash = state->hash; + + for (i = 0; i < w; i++) { + if (i == buffer_length) { + *offset = i; + // update history + memmove(state->history, state->history + i, w - i); + memcpy(state->history + w - i, buffer, i); + state->hash = hash; + return FINGERPRINT_RET_MAX; + } + hash = hash_fn(state, hash, buffer[i], state->history[i]); + + if ((hash & mask) == trigger) { + // found hit + i++; + *offset = i; + memmove(state->history, state->history + i, w - i); + memcpy(state->history + w - i, buffer, i); + state->hash = hash; + return FINGERPRINT_RET_HIT; + } + } + + hash = rolling_hash2_run_until(&i, buffer_length, state->table1, state->table2, + buffer, buffer - w, hash, mask, trigger); + if ((hash & mask) == trigger) { + // found hit + i++; + *offset = i; + memcpy(state->history, buffer + i - w, w); + state->hash = hash; + return FINGERPRINT_RET_HIT; + } + // no hit + *offset = i; + memcpy(state->history, buffer + i - w, w); + state->hash = hash; + return FINGERPRINT_RET_MAX; +} + +struct slver { + uint16_t snum; + uint8_t ver; + uint8_t core; +}; +struct slver rolling_hash2_init_slver_00000264; +struct slver rolling_hash2_init_slver = { 0x0264, 0x00, 0x00 }; + +struct slver rolling_hash2_reset_slver_00000265; +struct slver rolling_hash2_reset_slver = { 0x0265, 0x00, 0x00 }; + +struct slver rolling_hash2_run_slver_00000266; +struct slver rolling_hash2_run_slver = { 0x0266, 0x00, 0x00 }; |