2 Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <boost/filesystem.hpp>
25 #include <openssl/sha.h>
27 #include "KM_fileio.h"
32 using namespace boost;
42 Kumu::GenRandomValue (id);
43 id.EncodeHex (buffer, 64);
44 return string (buffer);
47 /** Create a digest for a file.
48 * @param filename File name.
52 libdcp::make_digest (string filename, sigc::signal1<void, float>* progress)
54 int const file_size = filesystem::file_size (filename);
56 Kumu::FileReader reader;
57 if (ASDCP_FAILURE (reader.OpenRead (filename.c_str ()))) {
58 throw runtime_error ("could not open file to compute digest");
64 Kumu::ByteString read_buffer (65536);
68 Kumu::Result_t r = reader.Read (read_buffer.Data(), read_buffer.Capacity(), &read);
70 if (r == Kumu::RESULT_ENDOFFILE) {
72 } else if (ASDCP_FAILURE (r)) {
73 throw runtime_error ("could not read file to compute digest");
76 SHA1_Update (&sha, read_buffer.Data(), read);
80 (*progress) (0.5 + (0.5 * done / file_size));
84 byte_t byte_buffer[20];
85 SHA1_Final (byte_buffer, &sha);
89 return Kumu::base64encode (byte_buffer, 20, digest, 64);