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56 lines
1.7 KiB
56 lines
1.7 KiB
9 years ago
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/*
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* Minio Cloud Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "isa-l.h"
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#include "ec_minio_common.h"
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/*
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Generate encode matrix during the encoding phase
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*/
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int32_t minio_init_encoder (int k, int m, unsigned char **encode_matrix, unsigned char **encode_tbls)
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{
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unsigned char *tmp_matrix;
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unsigned char *tmp_tbls;
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tmp_matrix = (unsigned char *) malloc (k * (k + m));
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tmp_tbls = (unsigned char *) malloc (k * (k + m) * 32);
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if (k < 5) {
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/*
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Commonly used method for choosing coefficients in erasure
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encoding but does not guarantee invertable for every sub
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matrix. For large k it is possible to find cases where the
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decode matrix chosen from sources and parity not in erasure
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are not invertable. Users may want to adjust for k > 5.
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-- Intel
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*/
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gf_gen_rs_matrix (tmp_matrix, k + m, k);
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} else {
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gf_gen_cauchy1_matrix (tmp_matrix, k + m, k);
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}
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ec_init_tables(k, m, &tmp_matrix[k * k], tmp_tbls);
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*encode_matrix = tmp_matrix;
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*encode_tbls = tmp_tbls;
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return 0;
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}
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