/*
* Class: eu_vandertil_jerasure_jni_Galois
* Method: galois_w08_region_multiply
* Signature: ([BII[BZ)V
*/
JNIEXPORT void JNICALL Java_eu_vandertil_jerasure_jni_Galois_galois_1w08_1region_1multiply
(JNIEnv *env, jclass clazz, jbyteArray jregion, jint multby, jint nbytes, jbyteArray jr2, jboolean add)
{
jbyte* region = env->GetByteArrayElements(jregion, NULL);
if(region == NULL) {
throwOutOfMemoryError(env, "Error getting region from Java");
return;
}
jbyte* r2 = NULL;
if(jr2 != NULL)
{
r2 = env->GetByteArrayElements(jr2, NULL);
if(r2 == NULL) {
throwOutOfMemoryError(env, "Error getting r2 from Java");
env->ReleaseByteArrayElements(jregion, region, NULL);
return;
}
}
galois_w08_region_multiply((char*)region, multby, nbytes, (char*)r2, (add == JNI_TRUE ? 1 : 0));
env->ReleaseByteArrayElements(jregion, region, NULL);
env->ReleaseByteArrayElements(jr2, r2, NULL);
}
/*
Multiplies matrix_row by multiple stripes of vector data.
matrix_row is of length row_len, as is data_ptrs.
Each data_ptr points to data_size bytes: all the stripes of particular vector-component.
Puts result in dst.
*/
void row_data_product(int* matrix_row, char** data_ptrs, char* dst, int row_len, int data_size, int w)
{
//int size = num_stripes * (w/8);
int size = data_size;
int k = row_len;
int init;
char *dptr, *sptr;
int i;
if (w != 1 && w != 8 && w != 16 && w != 32) {
fprintf(stderr, "ERROR: w is not 1, 8, 16 or 32\n");
exit(1);
}
init = 0;
dptr = dst;
/* First copy or xor any data that does not need to be multiplied by a factor */
for (i = 0; i < k; i++) {
if (matrix_row[i] == 1) {
sptr = data_ptrs[i];
if (init == 0) {
memcpy(dptr, sptr, size);
//jerasure_total_memcpy_bytes += size;
init = 1;
} else {
galois_region_xor(sptr, dptr, size);
//jerasure_total_xor_bytes += size;
}
}
}
/* Now do the data that needs to be multiplied by a factor */
for (i = 0; i < k; i++) {
if (matrix_row[i] != 0 && matrix_row[i] != 1) {
sptr = data_ptrs[i];
switch (w) {
case 8: galois_w08_region_multiply(sptr, matrix_row[i], size, dptr, init); break;
case 16: galois_w16_region_multiply(sptr, matrix_row[i], size, dptr, init); break;
case 32: galois_w32_region_multiply(sptr, matrix_row[i], size, dptr, init); break;
}
//jerasure_total_gf_bytes += size;
init = 1;
}
}
}
