Fix Linux/Mac OS X erasure decoding failure with new Golang version 1.5.1

Fixes #871

pkg/erasure/ec_minio_decode.c

@@ -80,12 +80,18 @@ int minio_init_decoder (int32_t *error_index,
                         unsigned char **decode_tbls,
                         uint32_t **decode_index)
 {
-        int i, j, r, s, l, z;
+        int i, j, r, l;
-        unsigned char input_matrix[k * n];
+
-        unsigned char inverse_matrix[k * n];
+        uint32_t      *tmp_decode_index = (uint32_t *) malloc(sizeof(uint32_t) * k);
-        unsigned char tmp_decode_matrix[k * n];
+        unsigned char *input_matrix;
-        unsigned char tmp_decode_tbls[k * n * 32];
+        unsigned char *inverse_matrix;
-        uint32_t tmp_decode_index[k];
+        unsigned char *tmp_decode_matrix;
+        unsigned char *tmp_decode_tbls;
+
+        input_matrix = (unsigned char *) malloc(sizeof(unsigned char) * k * n);
+        inverse_matrix = (unsigned char *) malloc(sizeof(unsigned char) * k * n);
+        tmp_decode_matrix = (unsigned char *) malloc(sizeof(unsigned char) * k * n);;
+        tmp_decode_tbls = (unsigned char *) malloc(sizeof(unsigned char) * k * n * 32);
 
         for (i = 0, r = 0; i < k; i++, r++) {
                 while (_minio_src_index_in_error(r, error_index, errs))
@@ -98,6 +104,9 @@ int minio_init_decoder (int32_t *error_index,
 
         // Not all vandermonde matrix can be inverted
         if (gf_invert_matrix(input_matrix, inverse_matrix, k) < 0) {
+                free(tmp_decode_matrix);
+                free(tmp_decode_tbls);
+                free(tmp_decode_index);
                 return -1;
         }
 
@@ -110,10 +119,9 @@ int minio_init_decoder (int32_t *error_index,
                                                        error_index[l] + j];
                         }
                 } else {
-                        int s = 0;
                         // decoding matrix element for coding chunks
                         for (i = 0; i < k; i++) {
-                                s = 0;
+                                unsigned char s = 0;
                                 for (j = 0; j < k; j++) {
                                         s ^= gf_mul(inverse_matrix[j * k + i],
                                                     encode_matrix[k *

pkg/erasure/ec_minio_encode.c

@@ -28,8 +28,6 @@ int32_t minio_init_encoder (int technique, int k, int m,
                             unsigned char **encode_matrix,
                             unsigned char **encode_tbls)
 {
-        size_t encode_matrix_size;
-        size_t encode_tbls_size;
         unsigned char *tmp_matrix;
         unsigned char *tmp_tbls;
 

pkg/erasure/erasure_encode.go

@@ -16,7 +16,6 @@
 
 package erasure
 
-// #cgo CFLAGS: -O0
 // #include <stdlib.h>
 // #include "ec_isal-l.h"
 // #include "ec_minio_common.h"