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74 lines
1.9 KiB
74 lines
1.9 KiB
/*
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This file is part of ethash.
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ethash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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ethash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ethash. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file io_posix.c
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* @author Lefteris Karapetsas <lefteris@ethdev.com>
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* @date 2015
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*/
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#include "io.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <unistd.h>
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FILE *ethash_fopen(const char *file_name, const char *mode)
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{
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return fopen(file_name, mode);
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}
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char *ethash_strncat(char *dest, size_t dest_size, const char *src, size_t count)
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{
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return strlen(dest) + count + 1 <= dest_size ? strncat(dest, src, count) : NULL;
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}
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enum ethash_io_rc ethash_io_prepare(char const *dirname,
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ethash_h256_t seedhash,
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FILE **output_file)
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{
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char mutable_name[DAG_MUTABLE_NAME_MAX_SIZE];
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enum ethash_io_rc ret = ETHASH_IO_FAIL;
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// assert directory exists, full owner permissions and read/search for others
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int rc = mkdir(dirname, S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH);
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if (rc == -1 && errno != EEXIST) {
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goto end;
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}
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ethash_io_mutable_name(REVISION, &seedhash, mutable_name);
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char *tmpfile = ethash_io_create_filename(dirname, mutable_name, strlen(mutable_name));
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if (!tmpfile) {
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goto end;
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}
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// try to open the file
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FILE *f = fopen(tmpfile, "rb");
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if (!f) {
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// file does not exist, will need to be created
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ret = ETHASH_IO_MEMO_MISMATCH;
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goto free_memo;
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}
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ret = ETHASH_IO_MEMO_MATCH;
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*output_file = f;
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free_memo:
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free(tmpfile);
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end:
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return ret;
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}
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