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73 lines
2.0 KiB
73 lines
2.0 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_win32.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 <direct.h>
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#include <errno.h>
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#include <stdio.h>
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enum ethash_io_rc ethash_io_prepare(char const *dirname, ethash_blockhash_t seedhash)
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{
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char read_buffer[DAG_MEMO_BYTESIZE];
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char expect_buffer[DAG_MEMO_BYTESIZE];
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enum ethash_io_rc ret = ETHASH_IO_FAIL;
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// assert directory exists
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int rc = _mkdir(dirname);
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if (rc == -1 && errno != EEXIST) {
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goto end;
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}
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char *memofile = ethash_io_create_filename(dirname, DAG_MEMO_NAME, sizeof(DAG_MEMO_NAME));
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if (!memofile) {
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goto end;
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}
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// try to open memo file
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FILE *f = fopen(memofile, "rb");
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if (!f) {
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// file does not exist, so no checking happens. All is fine.
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ret = ETHASH_IO_MEMO_MISMATCH;
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goto free_memo;
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}
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if (fread(read_buffer, 1, DAG_MEMO_BYTESIZE, f) != DAG_MEMO_BYTESIZE) {
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goto close;
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}
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ethash_io_serialize_info(ETHASH_REVISION, seedhash, expect_buffer);
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if (memcmp(read_buffer, expect_buffer, DAG_MEMO_BYTESIZE) != 0) {
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// we have different memo contents so delete the memo file
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if (_unlink(memofile) != 0) {
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goto close;
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}
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ret = ETHASH_IO_MEMO_MISMATCH;
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}
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ret = ETHASH_IO_MEMO_MATCH;
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close:
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fclose(f);
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free_memo:
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free(memofile);
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end:
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return ret;
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}
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