diff options
Diffstat (limited to 'example/reader_util.c')
-rw-r--r-- | example/reader_util.c | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/example/reader_util.c b/example/reader_util.c index 62fa3046a..b1f72c650 100644 --- a/example/reader_util.c +++ b/example/reader_util.c @@ -2253,55 +2253,6 @@ struct ndpi_proto ndpi_workflow_process_packet(struct ndpi_workflow * workflow, flow_risk)); } -/* ********************************************************** */ -/* http://home.thep.lu.se/~bjorn/crc/crc32_fast.c */ -/* ********************************************************** */ - -static uint32_t crc32_for_byte(uint32_t r) { - int j; - for(j = 0; j < 8; ++j) - r = ((r & 1) ? 0 : (uint32_t)0xEDB88320L) ^ r >> 1; - return r ^ (uint32_t)0xFF000000L; -} - -/* Any unsigned integer type with at least 32 bits may be used as - * accumulator type for fast crc32-calulation, but unsigned long is - * probably the optimal choice for most systems. */ -typedef unsigned long accum_t; - -static void init_tables(uint32_t* table, uint32_t* wtable) { - size_t i, j, k, w; - for(i = 0; i < 0x100; ++i) - table[i] = crc32_for_byte(i); - for(k = 0; k < sizeof(accum_t); ++k) - for(i = 0; i < 0x100; ++i) { - for(j = w = 0; j < sizeof(accum_t); ++j) - w = table[(uint8_t)(j == k? w ^ i: w)] ^ w >> 8; - wtable[(k << 8) + i] = w ^ (k? wtable[0]: 0); - } -} - -static void __crc32(const void* data, size_t n_bytes, uint32_t* crc) { - static uint32_t table[0x100], wtable[0x100*sizeof(accum_t)]; - size_t n_accum = n_bytes/sizeof(accum_t); - size_t i, j; - if(!*table) - init_tables(table, wtable); - for(i = 0; i < n_accum; ++i) { - accum_t a = *crc ^ ((accum_t*)data)[i]; - for(j = *crc = 0; j < sizeof(accum_t); ++j) - *crc ^= wtable[(j << 8) + (uint8_t)(a >> 8*j)]; - } - for(i = n_accum*sizeof(accum_t); i < n_bytes; ++i) - *crc = table[(uint8_t)*crc ^ ((uint8_t*)data)[i]] ^ *crc >> 8; -} - -u_int32_t ethernet_crc32(const void* data, size_t n_bytes) { - u_int32_t crc = 0; - __crc32(data, n_bytes, &crc); - return crc; -} - /* *********************************************** */ #ifdef USE_DPDK |