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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "message_digest_helper.h"
#include <array>
#include <cstring>
#include <cstdlib>
#include "MessageDigest.h"
#include "DlAbortEx.h"
#include "message.h"
#include "DefaultDiskWriter.h"
#include "util.h"
#include "fmt.h"
namespace aria2 {
namespace message_digest {
std::string digest(MessageDigest* ctx, const std::shared_ptr<BinaryStream>& bs,
int64_t offset, int64_t length)
{
std::array<unsigned char, 4_k> buf;
lldiv_t res = lldiv(length, buf.size());
int64_t iteration = res.quot;
size_t tail = res.rem;
for (int64_t i = 0; i < iteration; ++i) {
ssize_t readLength = bs->readData(buf.data(), buf.size(), offset);
if ((size_t)readLength != buf.size()) {
throw DL_ABORT_EX(fmt(EX_FILE_READ, "n/a", "data is too short"));
}
ctx->update(buf.data(), readLength);
offset += readLength;
}
if (tail) {
ssize_t readLength = bs->readData(buf.data(), tail, offset);
if ((size_t)readLength != tail) {
throw DL_ABORT_EX(fmt(EX_FILE_READ, "n/a", "data is too short"));
}
ctx->update(buf.data(), readLength);
}
return ctx->digest();
}
void digest(unsigned char* md, size_t mdLength, MessageDigest* ctx,
const void* data, size_t length)
{
size_t reqLength = ctx->getDigestLength();
if (mdLength < reqLength) {
throw DL_ABORT_EX(fmt("Insufficient space for storing message digest:"
" %lu required, but only %lu is allocated",
static_cast<unsigned long>(reqLength),
static_cast<unsigned long>(mdLength)));
}
ctx->update(data, length);
ctx->digest(md);
}
} // namespace message_digest
} // namespace aria2
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