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/*
* Library routines
*
* Copyright (C) 2020 Craig Barratt.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, visit the http://fsf.org website.
*/
#include "backuppc.h"
/*
* Compute the md5 digest of a file. Returns 0 on success
*/
int bpc_fileDigest(char *fileName, int compress, bpc_digest *digest)
{
md_context md5;
bpc_fileZIO_fd fd;
ssize_t nRead;
uchar buffer[1 << 20];
digest->len = 0;
md5_begin(&md5);
if ( bpc_fileZIO_open(&fd, fileName, 0, compress) ) {
bpc_logErrf("bpc_fileDigest: can't open %s for reading\n", fileName);
return -1;
}
while ( (nRead = bpc_fileZIO_read(&fd, buffer, sizeof(buffer))) > 0 ) {
md5_update(&md5, buffer, nRead);
}
bpc_fileZIO_close(&fd);
if ( nRead < 0 ) {
bpc_logErrf("bpc_fileDigest: failed to read %s\n", fileName);
return -1;
}
md5_result(&md5, digest->digest);
digest->len = MD5_DIGEST_LEN;
return 0;
}
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