mirror of https://github.com/aria2/aria2
168 lines
5.2 KiB
C++
168 lines
5.2 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "IteratableChunkChecksumValidator.h"
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#include <array>
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#include <cstring>
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#include <cstdlib>
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#include "util.h"
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#include "message.h"
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#include "DiskAdaptor.h"
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#include "FileEntry.h"
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#include "RecoverableException.h"
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#include "DownloadContext.h"
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#include "PieceStorage.h"
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#include "BitfieldMan.h"
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#include "LogFactory.h"
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#include "Logger.h"
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#include "MessageDigest.h"
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#include "fmt.h"
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#include "DlAbortEx.h"
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namespace aria2 {
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IteratableChunkChecksumValidator::IteratableChunkChecksumValidator(
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const std::shared_ptr<DownloadContext>& dctx,
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const std::shared_ptr<PieceStorage>& pieceStorage)
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: dctx_(dctx),
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pieceStorage_(pieceStorage),
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bitfield_(make_unique<BitfieldMan>(dctx_->getPieceLength(),
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dctx_->getTotalLength())),
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currentIndex_(0)
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{
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}
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IteratableChunkChecksumValidator::~IteratableChunkChecksumValidator() {}
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void IteratableChunkChecksumValidator::validateChunk()
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{
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if (!finished()) {
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std::string actualChecksum;
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try {
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actualChecksum = calculateActualChecksum();
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if (actualChecksum == dctx_->getPieceHashes()[currentIndex_]) {
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bitfield_->setBit(currentIndex_);
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}
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else {
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A2_LOG_INFO(
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fmt(EX_INVALID_CHUNK_CHECKSUM,
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static_cast<unsigned long>(currentIndex_),
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static_cast<int64_t>(getCurrentOffset()),
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util::toHex(dctx_->getPieceHashes()[currentIndex_]).c_str(),
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util::toHex(actualChecksum).c_str()));
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bitfield_->unsetBit(currentIndex_);
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}
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}
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catch (RecoverableException& ex) {
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A2_LOG_DEBUG_EX(fmt("Caught exception while validating piece index=%lu."
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" Some part of file may be missing."
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" Continue operation.",
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static_cast<unsigned long>(currentIndex_)),
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ex);
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bitfield_->unsetBit(currentIndex_);
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}
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++currentIndex_;
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if (finished()) {
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pieceStorage_->setBitfield(bitfield_->getBitfield(),
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bitfield_->getBitfieldLength());
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}
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}
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}
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std::string IteratableChunkChecksumValidator::calculateActualChecksum()
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{
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int64_t offset = getCurrentOffset();
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size_t length;
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// When validating last piece
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if (currentIndex_ + 1 == dctx_->getNumPieces()) {
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length = dctx_->getTotalLength() - offset;
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}
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else {
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length = dctx_->getPieceLength();
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}
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return digest(offset, length);
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}
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void IteratableChunkChecksumValidator::init()
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{
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ctx_ = MessageDigest::create(dctx_->getPieceHashType());
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bitfield_->clearAllBit();
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currentIndex_ = 0;
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}
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std::string IteratableChunkChecksumValidator::digest(int64_t offset,
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size_t length)
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{
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std::array<unsigned char, 4_k> buf;
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ctx_->reset();
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int64_t max = offset + length;
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while (offset < max) {
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size_t r = pieceStorage_->getDiskAdaptor()->readDataDropCache(
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buf.data(), std::min(static_cast<int64_t>(buf.size()), max - offset),
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offset);
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if (r == 0) {
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throw DL_ABORT_EX(
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fmt(EX_FILE_READ, dctx_->getBasePath().c_str(), "data is too short"));
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}
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ctx_->update(buf.data(), r);
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offset += r;
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}
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return ctx_->digest();
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}
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bool IteratableChunkChecksumValidator::finished() const
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{
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if (currentIndex_ >= dctx_->getNumPieces()) {
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return true;
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}
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else {
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return false;
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}
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}
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int64_t IteratableChunkChecksumValidator::getCurrentOffset() const
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{
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return static_cast<int64_t>(currentIndex_) * dctx_->getPieceLength();
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}
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int64_t IteratableChunkChecksumValidator::getTotalLength() const
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{
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return dctx_->getTotalLength();
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}
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} // namespace aria2
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