01ecf332ff
* Initial import of wear-leveling algorithm. * Alignment. * Docs tweaks. * Lock/unlock. * Update quantum/wear_leveling/wear_leveling_internal.h Co-authored-by: Stefan Kerkmann <karlk90@pm.me> * More tests, fix issue with consolidation when unlocked. * More tests. * Review comments. * Add plumbing for FNV1a. * Another test checking that checksum mismatch clears the cache. * Check that the write log still gets played back. Co-authored-by: Stefan Kerkmann <karlk90@pm.me>
468 lines
12 KiB
C
468 lines
12 KiB
C
/*
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* fnv32 - 32 bit Fowler/Noll/Vo hash of a buffer or string
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*
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* @(#) $Revision: 5.5 $
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* @(#) $Id: fnv32.c,v 5.5 2012/03/21 01:38:12 chongo Exp $
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* @(#) $Source: /usr/local/src/cmd/fnv/RCS/fnv32.c,v $
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*
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***
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*
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* Fowler/Noll/Vo hash
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*
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* The basis of this hash algorithm was taken from an idea sent
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* as reviewer comments to the IEEE POSIX P1003.2 committee by:
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*
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* Phong Vo (http://www.research.att.com/info/kpv/)
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* Glenn Fowler (http://www.research.att.com/~gsf/)
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*
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* In a subsequent ballot round:
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*
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* Landon Curt Noll (http://www.isthe.com/chongo/)
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*
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* improved on their algorithm. Some people tried this hash
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* and found that it worked rather well. In an EMail message
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* to Landon, they named it the ``Fowler/Noll/Vo'' or FNV hash.
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*
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* FNV hashes are designed to be fast while maintaining a low
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* collision rate. The FNV speed allows one to quickly hash lots
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* of data while maintaining a reasonable collision rate. See:
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*
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* http://www.isthe.com/chongo/tech/comp/fnv/index.html
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*
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* for more details as well as other forms of the FNV hash.
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*
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***
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*
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* Please do not copyright this code. This code is in the public domain.
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*
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* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* By:
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* chongo <Landon Curt Noll> /\oo/\
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* http://www.isthe.com/chongo/
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*
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* Share and Enjoy! :-)
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include "longlong.h"
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#include "fnv.h"
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#define WIDTH 32 /* bit width of hash */
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#define BUF_SIZE (32*1024) /* number of bytes to hash at a time */
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static char *usage =
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"usage: %s [-b bcnt] [-m] [-s arg] [-t code] [-v] [arg ...]\n"
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"\n"
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"\t-b bcnt\tmask off all but the lower bcnt bits (default 32)\n"
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"\t-m\tmultiple hashes, one per line for each arg\n"
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"\t-s\thash arg as a string (ignoring terminating NUL bytes)\n"
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"\t-t code\t test hash code: (0 ==> generate test vectors\n"
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"\t\t\t\t 1 ==> validate against FNV test vectors)\n"
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"\t-v\tverbose mode, print arg after hash (implies -m)\n"
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"\targ\tstring (if -s was given) or filename (default stdin)\n"
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"\n"
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"\tNOTE: Programs that begin with fnv0 implement the FNV-0 hash.\n"
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"\t The FNV-0 hash is historic FNV algorithm that is now deprecated.\n"
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"\n"
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"\tSee http://www.isthe.com/chongo/tech/comp/fnv/index.html for more info.\n"
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"\n"
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"\t@(#) FNV Version: %s\n";
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static char *program; /* our name */
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/*
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* test_fnv32 - test the FNV32 hash
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*
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* given:
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* hash_type type of FNV hash to test
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* init_hval initial hash value
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* mask lower bit mask
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* v_flag 1 => print test failure info on stderr
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* code 0 ==> generate FNV test vectors
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* 1 ==> validate against FNV test vectors
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*
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* returns: 0 ==> OK, else test vector failure number
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*/
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static int
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test_fnv32(enum fnv_type hash_type, Fnv32_t init_hval,
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Fnv32_t mask, int v_flag, int code)
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{
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struct test_vector *t; /* FNV test vestor */
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Fnv32_t hval; /* current hash value */
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int tstnum; /* test vector that failed, starting at 1 */
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/*
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* print preamble if generating test vectors
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*/
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if (code == 0) {
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switch (hash_type) {
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case FNV0_32:
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printf("struct fnv0_32_test_vector fnv0_32_vector[] = {\n");
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break;
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case FNV1_32:
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printf("struct fnv1_32_test_vector fnv1_32_vector[] = {\n");
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break;
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case FNV1a_32:
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printf("struct fnv1a_32_test_vector fnv1a_32_vector[] = {\n");
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break;
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default:
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unknown_hash_type(program, hash_type, 12); /* exit(12) */
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/*NOTREACHED*/
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}
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}
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/*
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* loop thru all test vectors
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*/
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for (t = fnv_test_str, tstnum = 1; t->buf != NULL; ++t, ++tstnum) {
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/*
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* compute the FNV hash
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*/
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hval = init_hval;
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switch (hash_type) {
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case FNV0_32:
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case FNV1_32:
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hval = fnv_32_buf(t->buf, t->len, hval);
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break;
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case FNV1a_32:
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hval = fnv_32a_buf(t->buf, t->len, hval);
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break;
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default:
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unknown_hash_type(program, hash_type, 13); /* exit(13) */
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/*NOTREACHED*/
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}
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/*
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* print the vector
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*/
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switch (code) {
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case 0: /* generate the test vector */
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printf(" { &fnv_test_str[%d], (Fnv32_t) 0x%08lxUL },\n",
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tstnum-1, hval & mask);
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break;
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case 1: /* validate against test vector */
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switch (hash_type) {
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case FNV0_32:
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if ((hval&mask) != (fnv0_32_vector[tstnum-1].fnv0_32 & mask)) {
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if (v_flag) {
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fprintf(stderr, "%s: failed fnv0_32 test # %d\n",
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program, tstnum);
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fprintf(stderr, "%s: test # 1 is 1st test\n", program);
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fprintf(stderr,
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"%s: expected 0x%08lx != generated: 0x%08lx\n",
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program, (hval&mask),
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(fnv0_32_vector[tstnum-1].fnv0_32 & mask));
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}
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return tstnum;
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}
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break;
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case FNV1_32:
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if ((hval&mask) != (fnv1_32_vector[tstnum-1].fnv1_32 & mask)) {
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if (v_flag) {
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fprintf(stderr, "%s: failed fnv1_32 test # %d\n",
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program, tstnum);
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fprintf(stderr, "%s: test # 1 is 1st test\n", program);
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fprintf(stderr,
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"%s: expected 0x%08lx != generated: 0x%08lx\n",
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program, (hval&mask),
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(fnv1_32_vector[tstnum-1].fnv1_32 & mask));
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}
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return tstnum;
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}
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break;
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case FNV1a_32:
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if ((hval&mask) != (fnv1a_32_vector[tstnum-1].fnv1a_32 &mask)) {
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if (v_flag) {
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fprintf(stderr, "%s: failed fnv1a_32 test # %d\n",
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program, tstnum);
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fprintf(stderr, "%s: test # 1 is 1st test\n", program);
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fprintf(stderr,
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"%s: expected 0x%08lx != generated: 0x%08lx\n",
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program, (hval&mask),
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(fnv1a_32_vector[tstnum-1].fnv1a_32 & mask));
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}
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return tstnum;
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}
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break;
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}
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break;
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default:
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fprintf(stderr, "%s: -m %d not implemented yet\n", program, code);
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exit(14);
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}
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}
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/*
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* print completion if generating test vectors
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*/
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if (code == 0) {
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printf(" { NULL, 0 }\n");
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printf("};\n");
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}
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/*
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* no failures, return code 0 ==> all OK
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*/
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return 0;
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}
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/*
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* main - the main function
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*
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* See the above usage for details.
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*/
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int
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main(int argc, char *argv[])
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{
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char buf[BUF_SIZE+1]; /* read buffer */
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int readcnt; /* number of characters written */
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Fnv32_t hval; /* current hash value */
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int s_flag = 0; /* 1 => -s was given, hash args as strings */
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int m_flag = 0; /* 1 => print multiple hashes, one per arg */
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int v_flag = 0; /* 1 => verbose hash print */
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int b_flag = WIDTH; /* -b flag value */
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int t_flag = -1; /* FNV test vector code (0=>print, 1=>test) */
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enum fnv_type hash_type = FNV_NONE; /* type of FNV hash to perform */
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Fnv32_t bmask; /* mask to apply to output */
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extern char *optarg; /* option argument */
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extern int optind; /* argv index of the next arg */
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int fd; /* open file to process */
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char *p;
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int i;
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/*
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* parse args
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*/
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program = argv[0];
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while ((i = getopt(argc, argv, "b:mst:v")) != -1) {
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switch (i) {
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case 'b': /* bcnt bit mask count */
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b_flag = atoi(optarg);
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break;
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case 'm': /* print multiple hashes, one per arg */
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m_flag = 1;
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break;
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case 's': /* hash args as strings */
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s_flag = 1;
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break;
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case 't': /* FNV test vector code */
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t_flag = atoi(optarg);
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if (t_flag < 0 || t_flag > 1) {
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fprintf(stderr, "%s: -t code must be 0 or 1\n", program);
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fprintf(stderr, usage, program, FNV_VERSION);
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exit(1);
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}
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m_flag = 1;
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break;
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case 'v': /* verbose hash print */
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m_flag = 1;
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v_flag = 1;
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break;
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default:
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fprintf(stderr, usage, program, FNV_VERSION);
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exit(1);
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}
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}
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/* -t code incompatible with -b, -m and args */
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if (t_flag >= 0) {
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if (b_flag != WIDTH) {
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fprintf(stderr, "%s: -t code incompatible with -b\n", program);
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exit(2);
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}
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if (s_flag != 0) {
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fprintf(stderr, "%s: -t code incompatible with -s\n", program);
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exit(3);
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}
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if (optind < argc) {
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fprintf(stderr, "%s: -t code incompatible args\n", program);
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exit(4);
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}
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}
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/* -s requires at least 1 arg */
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if (s_flag && optind >= argc) {
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fprintf(stderr, usage, program, FNV_VERSION);
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exit(5);
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}
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/* limit -b values */
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if (b_flag < 0 || b_flag > WIDTH) {
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fprintf(stderr, "%s: -b bcnt: %d must be >= 0 and < %d\n",
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program, b_flag, WIDTH);
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exit(6);
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}
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if (b_flag == WIDTH) {
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bmask = (Fnv32_t)0xffffffff;
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} else {
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bmask = (Fnv32_t)((1 << b_flag) - 1);
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}
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/*
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* start with the initial basis depending on the hash type
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*/
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p = strrchr(program, '/');
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if (p == NULL) {
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p = program;
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} else {
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++p;
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}
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if (strcmp(p, "fnv032") == 0) {
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/* using non-recommended FNV-0 and zero initial basis */
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hval = FNV0_32_INIT;
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hash_type = FNV0_32;
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} else if (strcmp(p, "fnv132") == 0) {
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/* using FNV-1 and non-zero initial basis */
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hval = FNV1_32_INIT;
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hash_type = FNV1_32;
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} else if (strcmp(p, "fnv1a32") == 0) {
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/* start with the FNV-1a initial basis */
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hval = FNV1_32A_INIT;
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hash_type = FNV1a_32;
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} else {
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fprintf(stderr, "%s: unknown program name, unknown hash type\n",
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program);
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exit(7);
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}
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/*
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* FNV test vector processing, if needed
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*/
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if (t_flag >= 0) {
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int code; /* test vector that failed, starting at 1 */
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/*
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* perform all tests
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*/
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code = test_fnv32(hash_type, hval, bmask, v_flag, t_flag);
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/*
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* evaluate the tests
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*/
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if (code == 0) {
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if (v_flag) {
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printf("passed\n");
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}
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exit(0);
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} else {
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printf("failed vector (1 is 1st test): %d\n", code);
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exit(8);
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}
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}
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/*
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* string hashing
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*/
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if (s_flag) {
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/* hash any other strings */
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for (i=optind; i < argc; ++i) {
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switch (hash_type) {
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case FNV0_32:
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case FNV1_32:
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hval = fnv_32_str(argv[i], hval);
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break;
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case FNV1a_32:
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hval = fnv_32a_str(argv[i], hval);
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break;
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default:
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unknown_hash_type(program, hash_type, 9); /* exit(9) */
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/*NOTREACHED*/
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}
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if (m_flag) {
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print_fnv32(hval, bmask, v_flag, argv[i]);
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}
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}
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/*
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* file hashing
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*/
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} else {
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/*
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* case: process only stdin
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*/
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if (optind >= argc) {
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/* case: process only stdin */
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while ((readcnt = read(0, buf, BUF_SIZE)) > 0) {
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switch (hash_type) {
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case FNV0_32:
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case FNV1_32:
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hval = fnv_32_buf(buf, readcnt, hval);
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break;
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case FNV1a_32:
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hval = fnv_32a_buf(buf, readcnt, hval);
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break;
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default:
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unknown_hash_type(program, hash_type, 10); /* exit(10) */
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/*NOTREACHED*/
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}
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}
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if (m_flag) {
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print_fnv32(hval, bmask, v_flag, "(stdin)");
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}
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} else {
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/*
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* process any other files
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*/
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for (i=optind; i < argc; ++i) {
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/* open the file */
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fd = open(argv[i], O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "%s: unable to open file: %s\n",
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program, argv[i]);
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exit(4);
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}
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/* hash the file */
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while ((readcnt = read(fd, buf, BUF_SIZE)) > 0) {
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switch (hash_type) {
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case FNV0_32:
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case FNV1_32:
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hval = fnv_32_buf(buf, readcnt, hval);
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break;
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case FNV1a_32:
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hval = fnv_32a_buf(buf, readcnt, hval);
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break;
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default:
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unknown_hash_type(program, hash_type, 11);/* exit(11) */
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/*NOTREACHED*/
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}
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}
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/* finish processing the file */
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if (m_flag) {
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print_fnv32(hval, bmask, v_flag, argv[i]);
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}
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close(fd);
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}
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}
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}
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/*
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* report hash and exit
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*/
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if (!m_flag) {
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print_fnv32(hval, bmask, v_flag, "");
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}
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return 0; /* exit(0); */
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}
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