Remove required gf-complete dependency from liberasurecode.

NOTE: We need to ensure that any erasure code backend using algebraic
signatures *must use* the same exact GF as those used in this library.  This
usually means same 'w' and primitive polynomial.

I plan to make the same change to Jerasure, so it will be compatible.
This commit is contained in:
Kevin Greenan 2014-07-16 08:39:36 -07:00
parent c41559c125
commit 0be44ad3ca
6 changed files with 825 additions and 28 deletions

View File

@ -33,16 +33,22 @@ AC_CHECK_FUNCS(malloc calloc realloc free)
# Check for jerasure/gf_complete headers
AC_CHECK_HEADERS(jerasure.h cauchy.h galois.h liberation.h reed_sol.h gf_complete.h)
# Enable this check when gf_complete is external
AC_CHECK_LIB([gf_complete], [gf_init_easy], [],
AC_CHECK_LIB([gf_complete], [gf_init_easy],
[
echo "Error! gf_complete is required for algorithmic signature support."
AM_CONDITIONAL([GF_COMPLETE_INSTALLED], [true])
AC_DEFINE([HAVE_LIBGF_COMPLETE], [1], ["Defined if gf-complete is installed"])
],
[
echo "Warning gf_complete is required for *high performance* algorithmic signature support."
echo "gf_complete is available from https://bitbucket.org/jimplank/gf-complete.git"
echo "On Debian/Ubuntu systems, you can use \'apt-get install gf-complete\'"
exit -1
echo "This will install with a slower Galois field backend!"
AM_CONDITIONAL([GF_COMPLETE_INSTALLED], [false])
])
AC_ARG_ENABLE(debug,
AS_HELP_STRING([--enable-debug],
[enable debugging, default: no]),

View File

@ -42,7 +42,7 @@
/* Define to 1 if you have the <liberation.h> header file. */
#undef HAVE_LIBERATION_H
/* Define to 1 if you have the `gf_complete' library (-lgf_complete). */
/* "Defined if gf-complete is installed" */
#undef HAVE_LIBGF_COMPLETE
/* Define to 1 if you have the <limits.h> header file. */
@ -127,9 +127,6 @@
*/
#undef LT_OBJDIR
/* Define to 1 if your C compiler doesn't accept -c and -o together. */
#undef NO_MINUS_C_MINUS_O
/* Name of package */
#undef PACKAGE

View File

@ -41,11 +41,28 @@
#ifndef _GALOIS_H
#define _GALOIS_H
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_LIBGF_COMPLETE
#include <gf_complete.h>
extern void galois_change_technique(gf_t *gf, int w);
gf_t* galois_init_field(int w,
int mult_type,
int region_type,
int divide_type,
uint64_t prim_poly,
int arg1,
int arg2);
gf_t* galois_init_composite_field(int w,
int region_type,
int divide_type,
int degree,
gf_t* base_gf);
gf_t * galois_get_field_ptr(int w);
#endif
extern int galois_single_multiply(int a, int b, int w);
extern int galois_single_divide(int a, int b, int w);
@ -79,21 +96,6 @@ void galois_w32_region_multiply(char *region, /* Region to multiply */
Otherwise region is overwritten */
int add); /* If (r2 != NULL && add) the produce is XOR'd with r2 */
gf_t* galois_init_field(int w,
int mult_type,
int region_type,
int divide_type,
uint64_t prim_poly,
int arg1,
int arg2);
gf_t* galois_init_composite_field(int w,
int region_type,
int divide_type,
int degree,
gf_t* base_gf);
gf_t * galois_get_field_ptr(int w);
#endif

View File

@ -16,7 +16,11 @@ liberasurecode_la_SOURCES = \
liberasurecode_la_CPPFLAGS = -Werror
liberasurecode_la_LIBADD = \
builtin/xor_codes/libXorcode.la -lgf_complete -lpthread
builtin/xor_codes/libXorcode.la -lpthread
if GF_COMPLETE_INSTALLED
liberasurecode_la_LIBADD += -lgf_complete
endif
# Version format (C - A).(A).(R) for C:R:A input
liberasurecode_la_LDFLAGS = -rpath '$(libdir)' -version-info 9:10:9

View File

@ -44,12 +44,14 @@
Revision 1.0 - 2007: James S. Plank
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "galois.h"
#ifdef HAVE_LIBGF_COMPLETE
#define MAX_GF_INSTANCES 64
gf_t *gfp_array[MAX_GF_INSTANCES] = { 0 };
int gfp_is_composite[MAX_GF_INSTANCES] = { 0 };
@ -349,3 +351,783 @@ int galois_inverse(int y, int w)
if (y == 0) return -1;
return galois_single_divide(1, y, w);
}
#else
#define NONE (10)
#define TABLE (11)
#define SHIFT (12)
#define LOGS (13)
#define SPLITW8 (14)
static int prim_poly[33] =
{ 0,
/* 1 */ 1,
/* 2 */ 07,
/* 3 */ 013,
/* 4 */ 023,
/* 5 */ 045,
/* 6 */ 0103,
/* 7 */ 0211,
/* 8 */ 0435,
/* 9 */ 01021,
/* 10 */ 02011,
/* 11 */ 04005,
/* 12 */ 010123,
/* 13 */ 020033,
/* 14 */ 042103,
/* 15 */ 0100003,
/* 16 */ 0210013,
/* 17 */ 0400011,
/* 18 */ 01000201,
/* 19 */ 02000047,
/* 20 */ 04000011,
/* 21 */ 010000005,
/* 22 */ 020000003,
/* 23 */ 040000041,
/* 24 */ 0100000207,
/* 25 */ 0200000011,
/* 26 */ 0400000107,
/* 27 */ 01000000047,
/* 28 */ 02000000011,
/* 29 */ 04000000005,
/* 30 */ 010040000007,
/* 31 */ 020000000011,
/* 32 */ 00020000007 }; /* Really 40020000007, but we're omitting the high order bit */
static int mult_type[33] =
{ NONE,
/* 1 */ TABLE,
/* 2 */ TABLE,
/* 3 */ TABLE,
/* 4 */ TABLE,
/* 5 */ TABLE,
/* 6 */ TABLE,
/* 7 */ TABLE,
/* 8 */ TABLE,
/* 9 */ TABLE,
/* 10 */ LOGS,
/* 11 */ LOGS,
/* 12 */ LOGS,
/* 13 */ LOGS,
/* 14 */ LOGS,
/* 15 */ LOGS,
/* 16 */ LOGS,
/* 17 */ LOGS,
/* 18 */ LOGS,
/* 19 */ LOGS,
/* 20 */ LOGS,
/* 21 */ LOGS,
/* 22 */ LOGS,
/* 23 */ SHIFT,
/* 24 */ SHIFT,
/* 25 */ SHIFT,
/* 26 */ SHIFT,
/* 27 */ SHIFT,
/* 28 */ SHIFT,
/* 29 */ SHIFT,
/* 30 */ SHIFT,
/* 31 */ SHIFT,
/* 32 */ SPLITW8 };
static int nw[33] = { 0, (1 << 1), (1 << 2), (1 << 3), (1 << 4),
(1 << 5), (1 << 6), (1 << 7), (1 << 8), (1 << 9), (1 << 10),
(1 << 11), (1 << 12), (1 << 13), (1 << 14), (1 << 15), (1 << 16),
(1 << 17), (1 << 18), (1 << 19), (1 << 20), (1 << 21), (1 << 22),
(1 << 23), (1 << 24), (1 << 25), (1 << 26), (1 << 27), (1 << 28),
(1 << 29), (1 << 30), (1 << 31), -1 };
static int nwm1[33] = { 0, (1 << 1)-1, (1 << 2)-1, (1 << 3)-1, (1 << 4)-1,
(1 << 5)-1, (1 << 6)-1, (1 << 7)-1, (1 << 8)-1, (1 << 9)-1, (1 << 10)-1,
(1 << 11)-1, (1 << 12)-1, (1 << 13)-1, (1 << 14)-1, (1 << 15)-1, (1 << 16)-1,
(1 << 17)-1, (1 << 18)-1, (1 << 19)-1, (1 << 20)-1, (1 << 21)-1, (1 << 22)-1,
(1 << 23)-1, (1 << 24)-1, (1 << 25)-1, (1 << 26)-1, (1 << 27)-1, (1 << 28)-1,
(1 << 29)-1, (1 << 30)-1, 0x7fffffff, 0xffffffff };
static int *galois_log_tables[33] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
static int *galois_ilog_tables[33] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
static int *galois_mult_tables[33] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
static int *galois_div_tables[33] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
/* Special case for w = 32 */
static int *galois_split_w8[7] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL };
int galois_create_log_tables(int w)
{
int j, b;
if (w > 30) return -1;
if (galois_log_tables[w] != NULL) return 0;
galois_log_tables[w] = (int *) malloc(sizeof(int)*nw[w]);
if (galois_log_tables[w] == NULL) return -1;
galois_ilog_tables[w] = (int *) malloc(sizeof(int)*nw[w]*3);
if (galois_ilog_tables[w] == NULL) {
free(galois_log_tables[w]);
galois_log_tables[w] = NULL;
return -1;
}
for (j = 0; j < nw[w]; j++) {
galois_log_tables[w][j] = nwm1[w];
galois_ilog_tables[w][j] = 0;
}
b = 1;
for (j = 0; j < nwm1[w]; j++) {
if (galois_log_tables[w][b] != nwm1[w]) {
fprintf(stderr, "Galois_create_log_tables Error: j=%d, b=%d, B->J[b]=%d, J->B[j]=%d (0%o)\n",
j, b, galois_log_tables[w][b], galois_ilog_tables[w][j], (b << 1) ^ prim_poly[w]);
exit(1);
}
galois_log_tables[w][b] = j;
galois_ilog_tables[w][j] = b;
b = b << 1;
if (b & nw[w]) b = (b ^ prim_poly[w]) & nwm1[w];
}
for (j = 0; j < nwm1[w]; j++) {
galois_ilog_tables[w][j+nwm1[w]] = galois_ilog_tables[w][j];
galois_ilog_tables[w][j+nwm1[w]*2] = galois_ilog_tables[w][j];
}
galois_ilog_tables[w] += nwm1[w];
return 0;
}
int galois_logtable_multiply(int x, int y, int w)
{
int sum_j;
if (x == 0 || y == 0) return 0;
sum_j = galois_log_tables[w][x] + galois_log_tables[w][y];
/* if (sum_j >= nwm1[w]) sum_j -= nwm1[w]; Don't need to do this,
because we replicate the ilog table twice. */
return galois_ilog_tables[w][sum_j];
}
int galois_logtable_divide(int x, int y, int w)
{
int sum_j;
int z;
if (y == 0) return -1;
if (x == 0) return 0;
sum_j = galois_log_tables[w][x] - galois_log_tables[w][y];
/* if (sum_j < 0) sum_j += nwm1[w]; Don't need to do this, because we replicate the ilog table twice. */
z = galois_ilog_tables[w][sum_j];
return z;
}
int galois_create_mult_tables(int w)
{
int j, x, y, logx;
if (w >= 14) return -1;
if (galois_mult_tables[w] != NULL) return 0;
galois_mult_tables[w] = (int *) malloc(sizeof(int) * nw[w] * nw[w]);
if (galois_mult_tables[w] == NULL) return -1;
galois_div_tables[w] = (int *) malloc(sizeof(int) * nw[w] * nw[w]);
if (galois_div_tables[w] == NULL) {
free(galois_mult_tables[w]);
galois_mult_tables[w] = NULL;
return -1;
}
if (galois_log_tables[w] == NULL) {
if (galois_create_log_tables(w) < 0) {
free(galois_mult_tables[w]);
free(galois_div_tables[w]);
galois_mult_tables[w] = NULL;
galois_div_tables[w] = NULL;
return -1;
}
}
/* Set mult/div tables for x = 0 */
j = 0;
galois_mult_tables[w][j] = 0; /* y = 0 */
galois_div_tables[w][j] = -1;
j++;
for (y = 1; y < nw[w]; y++) { /* y > 0 */
galois_mult_tables[w][j] = 0;
galois_div_tables[w][j] = 0;
j++;
}
for (x = 1; x < nw[w]; x++) { /* x > 0 */
galois_mult_tables[w][j] = 0; /* y = 0 */
galois_div_tables[w][j] = -1;
j++;
logx = galois_log_tables[w][x];
for (y = 1; y < nw[w]; y++) { /* y > 0 */
galois_mult_tables[w][j] = galois_ilog_tables[w][logx+galois_log_tables[w][y]];
galois_div_tables[w][j] = galois_ilog_tables[w][logx-galois_log_tables[w][y]];
j++;
}
}
return 0;
}
int galois_ilog(int value, int w)
{
if (galois_ilog_tables[w] == NULL) {
if (galois_create_log_tables(w) < 0) {
fprintf(stderr, "Error: galois_ilog - w is too big. Sorry\n");
exit(1);
}
}
return galois_ilog_tables[w][value];
}
int galois_log(int value, int w)
{
if (galois_log_tables[w] == NULL) {
if (galois_create_log_tables(w) < 0) {
fprintf(stderr, "Error: galois_log - w is too big. Sorry\n");
exit(1);
}
}
return galois_log_tables[w][value];
}
int galois_shift_multiply(int x, int y, int w)
{
int prod;
int i, j, ind;
int k;
int scratch[33];
prod = 0;
for (i = 0; i < w; i++) {
scratch[i] = y;
if (y & (1 << (w-1))) {
y = y << 1;
y = (y ^ prim_poly[w]) & nwm1[w];
} else {
y = y << 1;
}
}
for (i = 0; i < w; i++) {
ind = (1 << i);
if (ind & x) {
j = 1;
for (k = 0; k < w; k++) {
prod = prod ^ (j & scratch[i]);
j = (j << 1);
}
}
}
return prod;
}
int galois_single_multiply(int x, int y, int w)
{
int sum_j;
int z;
if (x == 0 || y == 0) return 0;
if (mult_type[w] == TABLE) {
if (galois_mult_tables[w] == NULL) {
if (galois_create_mult_tables(w) < 0) {
fprintf(stderr, "ERROR -- cannot make multiplication tables for w=%d\n", w);
exit(1);
}
}
return galois_mult_tables[w][(x<<w)|y];
} else if (mult_type[w] == LOGS) {
if (galois_log_tables[w] == NULL) {
if (galois_create_log_tables(w) < 0) {
fprintf(stderr, "ERROR -- cannot make log tables for w=%d\n", w);
exit(1);
}
}
sum_j = galois_log_tables[w][x] + galois_log_tables[w][y];
z = galois_ilog_tables[w][sum_j];
return z;
} else if (mult_type[w] == SPLITW8) {
if (galois_split_w8[0] == NULL) {
if (galois_create_split_w8_tables() < 0) {
fprintf(stderr, "ERROR -- cannot make log split_w8_tables for w=%d\n", w);
exit(1);
}
}
return galois_split_w8_multiply(x, y);
} else if (mult_type[w] == SHIFT) {
return galois_shift_multiply(x, y, w);
}
fprintf(stderr, "Galois_single_multiply - no implementation for w=%d\n", w);
exit(1);
}
int galois_multtable_multiply(int x, int y, int w)
{
return galois_mult_tables[w][(x<<w)|y];
}
int galois_single_divide(int a, int b, int w)
{
int sum_j;
if (mult_type[w] == TABLE) {
if (galois_div_tables[w] == NULL) {
if (galois_create_mult_tables(w) < 0) {
fprintf(stderr, "ERROR -- cannot make multiplication tables for w=%d\n", w);
exit(1);
}
}
return galois_div_tables[w][(a<<w)|b];
} else if (mult_type[w] == LOGS) {
if (b == 0) return -1;
if (a == 0) return 0;
if (galois_log_tables[w] == NULL) {
if (galois_create_log_tables(w) < 0) {
fprintf(stderr, "ERROR -- cannot make log tables for w=%d\n", w);
exit(1);
}
}
sum_j = galois_log_tables[w][a] - galois_log_tables[w][b];
return galois_ilog_tables[w][sum_j];
} else {
if (b == 0) return -1;
if (a == 0) return 0;
sum_j = galois_inverse(b, w);
return galois_single_multiply(a, sum_j, w);
}
fprintf(stderr, "Galois_single_divide - no implementation for w=%d\n", w);
exit(1);
}
int galois_shift_divide(int a, int b, int w)
{
int inverse;
if (b == 0) return -1;
if (a == 0) return 0;
inverse = galois_shift_inverse(b, w);
return galois_shift_multiply(a, inverse, w);
}
int galois_multtable_divide(int x, int y, int w)
{
return galois_div_tables[w][(x<<w)|y];
}
void galois_w08_region_multiply(char *region, /* Region to multiply */
int multby, /* Number to multiply by */
int nbytes, /* Number of bytes in region */
char *r2, /* If r2 != NULL, products go here */
int add)
{
unsigned char *ur1, *ur2, *cp;
unsigned char prod;
int i, srow, j;
unsigned long l, *lp2;
unsigned char *lp;
int sol;
ur1 = (unsigned char *) region;
ur2 = (r2 == NULL) ? ur1 : (unsigned char *) r2;
/* This is used to test its performance with respect to just calling galois_single_multiply
if (r2 == NULL || !add) {
for (i = 0; i < nbytes; i++) ur2[i] = galois_single_multiply(ur1[i], multby, 8);
} else {
for (i = 0; i < nbytes; i++) {
ur2[i] = (ur2[i]^galois_single_multiply(ur1[i], multby, 8));
}
}
*/
if (galois_mult_tables[8] == NULL) {
if (galois_create_mult_tables(8) < 0) {
fprintf(stderr, "galois_08_region_multiply -- couldn't make multiplication tables\n");
exit(1);
}
}
srow = multby * nw[8];
if (r2 == NULL || !add) {
for (i = 0; i < nbytes; i++) {
prod = galois_mult_tables[8][srow+ur1[i]];
ur2[i] = prod;
}
} else {
sol = sizeof(long);
lp2 = &l;
lp = (unsigned char *) lp2;
for (i = 0; i < nbytes; i += sol) {
cp = ur2+i;
lp2 = (unsigned long *) cp;
for (j = 0; j < sol; j++) {
prod = galois_mult_tables[8][srow+ur1[i+j]];
lp[j] = prod;
}
*lp2 = (*lp2) ^ l;
}
}
return;
}
void galois_w16_region_multiply(char *region, /* Region to multiply */
int multby, /* Number to multiply by */
int nbytes, /* Number of bytes in region */
char *r2, /* If r2 != NULL, products go here */
int add)
{
unsigned short *ur1, *ur2, *cp;
int prod;
int i, log1, j, log2;
unsigned long l, *lp2, *lptop;
unsigned short *lp;
int sol;
ur1 = (unsigned short *) region;
ur2 = (r2 == NULL) ? ur1 : (unsigned short *) r2;
nbytes /= 2;
/* This is used to test its performance with respect to just calling galois_single_multiply */
/*
if (r2 == NULL || !add) {
for (i = 0; i < nbytes; i++) ur2[i] = galois_single_multiply(ur1[i], multby, 16);
} else {
for (i = 0; i < nbytes; i++) {
ur2[i] = (ur2[i]^galois_single_multiply(ur1[i], multby, 16));
}
}
return;
*/
if (multby == 0) {
if (!add) {
lp2 = (unsigned long *) ur2;
ur2 += nbytes;
lptop = (unsigned long *) ur2;
while (lp2 < lptop) { *lp2 = 0; lp2++; }
}
return;
}
if (galois_log_tables[16] == NULL) {
if (galois_create_log_tables(16) < 0) {
fprintf(stderr, "galois_16_region_multiply -- couldn't make log tables\n");
exit(1);
}
}
log1 = galois_log_tables[16][multby];
if (r2 == NULL || !add) {
for (i = 0; i < nbytes; i++) {
if (ur1[i] == 0) {
ur2[i] = 0;
} else {
prod = galois_log_tables[16][ur1[i]] + log1;
ur2[i] = galois_ilog_tables[16][prod];
}
}
} else {
sol = sizeof(long)/2;
lp2 = &l;
lp = (unsigned short *) lp2;
for (i = 0; i < nbytes; i += sol) {
cp = ur2+i;
lp2 = (unsigned long *) cp;
for (j = 0; j < sol; j++) {
if (ur1[i+j] == 0) {
lp[j] = 0;
} else {
log2 = galois_log_tables[16][ur1[i+j]];
prod = log2 + log1;
lp[j] = galois_ilog_tables[16][prod];
}
}
*lp2 = (*lp2) ^ l;
}
}
return;
}
int galois_inverse(int y, int w)
{
if (y == 0) return -1;
if (mult_type[w] == SHIFT || mult_type[w] == SPLITW8) return galois_shift_inverse(y, w);
return galois_single_divide(1, y, w);
}
/* This will destroy mat, by the way */
void galois_invert_binary_matrix(int *mat, int *inv, int rows)
{
int cols, i, j, k;
int tmp;
cols = rows;
for (i = 0; i < rows; i++) inv[i] = (1 << i);
/* First -- convert into upper triangular */
for (i = 0; i < cols; i++) {
/* Swap rows if we ave a zero i,i element. If we can't swap, then the
matrix was not invertible */
if ((mat[i] & (1 << i)) == 0) {
for (j = i+1; j < rows && (mat[j] & (1 << i)) == 0; j++) ;
if (j == rows) {
fprintf(stderr, "galois_invert_matrix: Matrix not invertible!!\n");
exit(1);
}
tmp = mat[i]; mat[i] = mat[j]; mat[j] = tmp;
tmp = inv[i]; inv[i] = inv[j]; inv[j] = tmp;
}
/* Now for each j>i, add A_ji*Ai to Aj */
for (j = i+1; j != rows; j++) {
if ((mat[j] & (1 << i)) != 0) {
mat[j] ^= mat[i];
inv[j] ^= inv[i];
}
}
}
/* Now the matrix is upper triangular. Start at the top and multiply down */
for (i = rows-1; i >= 0; i--) {
for (j = 0; j < i; j++) {
if (mat[j] & (1 << i)) {
inv[j] ^= inv[i];
}
}
}
}
int galois_shift_inverse(int y, int w)
{
int mat[1024], mat2[32];
int inv[1024], inv2[32];
int ind, i, j, k, prod;
for (i = 0; i < w; i++) {
mat2[i] = y;
if (y & nw[w-1]) {
y = y << 1;
y = (y ^ prim_poly[w]) & nwm1[w];
} else {
y = y << 1;
}
}
galois_invert_binary_matrix(mat2, inv2, w);
return inv2[0];
}
int *galois_get_mult_table(int w)
{
if (galois_mult_tables[w] == NULL) {
if (galois_create_mult_tables(w)) {
return NULL;
}
}
return galois_mult_tables[w];
}
int *galois_get_div_table(int w)
{
if (galois_mult_tables[w] == NULL) {
if (galois_create_mult_tables(w)) {
return NULL;
}
}
return galois_div_tables[w];
}
int *galois_get_log_table(int w)
{
if (galois_log_tables[w] == NULL) {
if (galois_create_log_tables(w)) {
return NULL;
}
}
return galois_log_tables[w];
}
int *galois_get_ilog_table(int w)
{
if (galois_ilog_tables[w] == NULL) {
if (galois_create_log_tables(w)) {
return NULL;
}
}
return galois_ilog_tables[w];
}
void galois_w32_region_multiply(char *region, /* Region to multiply */
int multby, /* Number to multiply by */
int nbytes, /* Number of bytes in region */
char *r2, /* If r2 != NULL, products go here */
int add)
{
unsigned int *ur1, *ur2, *cp, *ur2top;
unsigned long *lp2, *lptop;
int i, j, a, b, accumulator, i8, j8, k;
int acache[4];
ur1 = (unsigned int *) region;
ur2 = (r2 == NULL) ? ur1 : (unsigned int *) r2;
nbytes /= sizeof(int);
ur2top = ur2 + nbytes;
if (galois_split_w8[0]== NULL) {
if (galois_create_split_w8_tables(8) < 0) {
fprintf(stderr, "galois_32_region_multiply -- couldn't make split multiplication tables\n");
exit(1);
}
}
/* If we're overwriting r2, then we can't do better than just calling split_multiply.
We'll inline it here to save on the procedure call overhead */
i8 = 0;
for (i = 0; i < 4; i++) {
acache[i] = (((multby >> i8) & 255) << 8);
i8 += 8;
}
if (!add) {
for (k = 0; k < nbytes; k++) {
accumulator = 0;
for (i = 0; i < 4; i++) {
a = acache[i];
j8 = 0;
for (j = 0; j < 4; j++) {
b = ((ur1[k] >> j8) & 255);
accumulator ^= galois_split_w8[i+j][a|b];
j8 += 8;
}
}
ur2[k] = accumulator;
}
} else {
for (k = 0; k < nbytes; k++) {
accumulator = 0;
for (i = 0; i < 4; i++) {
a = acache[i];
j8 = 0;
for (j = 0; j < 4; j++) {
b = ((ur1[k] >> j8) & 255);
accumulator ^= galois_split_w8[i+j][a|b];
j8 += 8;
}
}
ur2[k] = (ur2[k] ^ accumulator);
}
}
return;
}
void galois_region_xor( char *r1, /* Region 1 */
char *r2, /* Region 2 */
int nbytes) /* Number of bytes in region */
{
long *l1;
long *l2;
long *ltop;
char *ctop;
int res = nbytes % sizeof(long);
ctop = r1 + (nbytes - res);
ltop = (long *) ctop;
l1 = (long *) r1;
l2 = (long *) r2;
while (l1 < ltop) {
*l2 = ((*l1) ^ (*l2));
l1++;
l2++;
}
r1 = r1 + (nbytes - res);
r2 = r2 + (nbytes - res);
ctop = r1 + nbytes;
while (r1 < ctop) {
*r2 = ((*r1) ^ (*r2));
r1++;
r2++;
}
}
int galois_create_split_w8_tables()
{
int p1, p2, i, j, p1elt, p2elt, index, ishift, jshift, *table;
if (galois_split_w8[0] != NULL) return 0;
if (galois_create_mult_tables(8) < 0) return -1;
for (i = 0; i < 7; i++) {
galois_split_w8[i] = (int *) malloc(sizeof(int) * (1 << 16));
if (galois_split_w8[i] == NULL) {
for (i--; i >= 0; i--) free(galois_split_w8[i]);
return -1;
}
}
for (i = 0; i < 4; i += 3) {
ishift = i * 8;
for (j = ((i == 0) ? 0 : 1) ; j < 4; j++) {
jshift = j * 8;
table = galois_split_w8[i+j];
index = 0;
for (p1 = 0; p1 < 256; p1++) {
p1elt = (p1 << ishift);
for (p2 = 0; p2 < 256; p2++) {
p2elt = (p2 << jshift);
table[index] = galois_shift_multiply(p1elt, p2elt, 32);
index++;
}
}
}
}
return 0;
}
int galois_split_w8_multiply(int x, int y)
{
int i, j, a, b, accumulator, i8, j8;
accumulator = 0;
i8 = 0;
for (i = 0; i < 4; i++) {
a = (((x >> i8) & 255) << 8);
j8 = 0;
for (j = 0; j < 4; j++) {
b = ((y >> j8) & 255);
accumulator ^= galois_split_w8[i+j][a|b];
j8 += 8;
}
i8 += 8;
}
return accumulator;
}
#endif

View File

@ -5,16 +5,22 @@ test_xor_hd_code_SOURCES = \
builtin/xor_codes/test_xor_hd_code.c \
builtin/xor_codes/test_xor_hd_code.h
test_xor_hd_code_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/include/erasurecode -I$(top_srcdir)/include/xor_codes
test_xor_hd_code_LDFLAGS = -static-libtool-libs -lgf_complete $(top_srcdir)/src/liberasurecode.la $(top_srcdir)/src/builtin/xor_codes/libXorcode.la
test_xor_hd_code_LDFLAGS = -static-libtool-libs $(top_srcdir)/src/liberasurecode.la $(top_srcdir)/src/builtin/xor_codes/libXorcode.la
check_PROGRAMS = test_xor_hd_code
alg_sig_test_SOURCES = utils/chksum/test_alg_sig.c
alg_sig_test_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/include/erasurecode -I$(top_srcdir)/include/xor_codes
alg_sig_test_LDFLAGS = -static-libtool-libs $(top_srcdir)/src/liberasurecode.la -lgf_complete -ldl
alg_sig_test_LDFLAGS = -static-libtool-libs $(top_srcdir)/src/liberasurecode.la -ldl
check_PROGRAMS += alg_sig_test
liberasurecode_test_SOURCES = liberasurecode_test.c
liberasurecode_test_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/include/erasurecode
liberasurecode_test_LDFLAGS = -lgf_complete $(top_srcdir)/src/liberasurecode.la -ldl -lpthread
liberasurecode_test_LDFLAGS = $(top_srcdir)/src/liberasurecode.la -ldl -lpthread
check_PROGRAMS += liberasurecode_test
if GF_COMPLETE_INSTALLED
alg_sig_test_LDFLAGS += -lgf_complete
liberasurecode_test_LDFLAGS += -lgf_complete
test_xor_hd_code_LDFLAGS += -lgf_complete
endif