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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdexcept>
#include <sstream>
#include <iomanip>
#include <openssl/sha.h>
#include "KM_util.h"
#include "KM_fileio.h"
#include "AS_DCP.h"
#include "util.h"
using namespace std;
/** Create a UUID.
* @return UUID.
*/
string
libdcp::make_uuid ()
{
char buffer[64];
Kumu::UUID id;
Kumu::GenRandomValue (id);
id.EncodeHex (buffer, 64);
return string (buffer);
}
/** Create a digest for a file.
* @param filename File name.
* @return Digest.
*/
string
libdcp::make_digest (string filename)
{
Kumu::FileReader reader;
if (ASDCP_FAILURE (reader.OpenRead (filename.c_str ()))) {
throw runtime_error ("could not open file to compute digest");
}
SHA_CTX sha;
SHA1_Init (&sha);
Kumu::ByteString read_buffer (65536);
while (1) {
ui32_t read = 0;
Kumu::Result_t r = reader.Read (read_buffer.Data(), read_buffer.Capacity(), &read);
if (r == Kumu::RESULT_ENDOFFILE) {
break;
} else if (ASDCP_FAILURE (r)) {
throw runtime_error ("could not read file to compute digest");
}
SHA1_Update (&sha, read_buffer.Data(), read);
}
byte_t byte_buffer[20];
SHA1_Final (byte_buffer, &sha);
stringstream s;
char digest[64];
s << setfill('0') << setw(36) << Kumu::base64encode (byte_buffer, 20, digest, 64);
return s.str ();
}
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