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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 "MultiDiskAdaptor.h"
#include "DefaultDiskWriter.h"
#include "DlAbortEx.h"
#include "message.h"
#include "Util.h"
#include <errno.h>
void MultiDiskAdaptor::resetDiskWriterEntries() {
diskWriterEntries.clear();
for(FileEntries::const_iterator itr = fileEntries.begin();
itr != fileEntries.end(); itr++) {
DiskWriterEntryHandle entry = new DiskWriterEntry(*itr);
if((*itr)->isRequested()) {
entry->setDiskWriter(DefaultDiskWriter::createNewDiskWriter(option));
} else {
entry->setDiskWriter(new DefaultDiskWriter());
}
diskWriterEntries.push_back(entry);
}
}
string MultiDiskAdaptor::getTopDirPath() const {
return storeDir+"/"+topDir;
}
void MultiDiskAdaptor::mkdir() const {
for(FileEntries::const_iterator itr = fileEntries.begin();
itr != fileEntries.end(); itr++) {
(*itr)->setupDir(getTopDirPath());
}
}
void MultiDiskAdaptor::openFile() {
mkdir();
resetDiskWriterEntries();
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
(*itr)->openFile(getTopDirPath());
}
}
void MultiDiskAdaptor::initAndOpenFile() {
mkdir();
resetDiskWriterEntries();
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
(*itr)->initAndOpenFile(getTopDirPath());
}
}
void MultiDiskAdaptor::openExistingFile() {
resetDiskWriterEntries();
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
(*itr)->openExistingFile(getTopDirPath());
}
}
void MultiDiskAdaptor::closeFile() {
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
(*itr)->closeFile();
}
}
void MultiDiskAdaptor::onDownloadComplete() {
closeFile();
openFile();
}
void MultiDiskAdaptor::writeData(const unsigned char* data, int32_t len,
int64_t offset)
{
int64_t fileOffset = offset;
bool writing = false;
int32_t rem = len;
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end() && rem != 0; itr++) {
if(isInRange(*itr, offset) || writing) {
int32_t writeLength = calculateLength(*itr, fileOffset, rem);
(*itr)->getDiskWriter()->writeData(data+(len-rem), writeLength, fileOffset);
rem -= writeLength;
writing = true;
fileOffset = 0;
} else {
fileOffset -= (*itr)->getFileEntry()->getLength();
}
}
if(!writing) {
throw new DlAbortEx(EX_FILE_OFFSET_OUT_OF_RANGE, offset);
}
}
bool MultiDiskAdaptor::isInRange(const DiskWriterEntryHandle entry,
int64_t offset) const
{
return entry->getFileEntry()->getOffset() <= offset &&
offset < entry->getFileEntry()->getOffset()+entry->getFileEntry()->getLength();
}
int32_t MultiDiskAdaptor::calculateLength(const DiskWriterEntryHandle entry,
int64_t fileOffset,
int32_t rem) const
{
int32_t length;
if(entry->getFileEntry()->getLength() < fileOffset+rem) {
length = entry->getFileEntry()->getLength()-fileOffset;
} else {
length = rem;
}
return length;
}
int MultiDiskAdaptor::readData(unsigned char* data, int32_t len, int64_t offset)
{
int64_t fileOffset = offset;
bool reading = false;
int32_t rem = len;
int32_t totalReadLength = 0;
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end() && rem != 0; itr++) {
if(isInRange(*itr, offset) || reading) {
int32_t readLength = calculateLength((*itr), fileOffset, rem);
totalReadLength += (*itr)->getDiskWriter()->readData(data+(len-rem), readLength, fileOffset);
rem -= readLength;
reading = true;
fileOffset = 0;
} else {
fileOffset -= (*itr)->getFileEntry()->getLength();
}
}
if(!reading) {
throw new DlAbortEx(EX_FILE_OFFSET_OUT_OF_RANGE, offset);
}
return totalReadLength;
}
void MultiDiskAdaptor::hashUpdate(MessageDigestContext& ctx,
const DiskWriterEntryHandle& entry,
int64_t offset, int64_t length)
{
int32_t BUFSIZE = 16*1024;
unsigned char buf[BUFSIZE];
for(int64_t i = 0; i < length/BUFSIZE; i++) {
if(BUFSIZE != entry->getDiskWriter()->readData(buf, BUFSIZE, offset)) {
throw new DlAbortEx(EX_FILE_SHA1SUM, "", strerror(errno));
}
ctx.digestUpdate(buf, BUFSIZE);
offset += BUFSIZE;
}
int32_t r = length%BUFSIZE;
if(r > 0) {
if((int32_t)r != entry->getDiskWriter()->readData(buf, r, offset)) {
throw new DlAbortEx(EX_FILE_SHA1SUM, "", strerror(errno));
}
ctx.digestUpdate(buf, r);
}
}
string MultiDiskAdaptor::messageDigest(int64_t offset, int64_t length,
const MessageDigestContext::DigestAlgo& algo) {
int64_t fileOffset = offset;
bool reading = false;
int32_t rem = length;
MessageDigestContext ctx(algo);
ctx.digestInit();
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end() && rem != 0; itr++) {
if(isInRange(*itr, offset) || reading) {
int32_t readLength = calculateLength((*itr), fileOffset, rem);
hashUpdate(ctx, *itr, fileOffset, readLength);
rem -= readLength;
reading = true;
fileOffset = 0;
} else {
fileOffset -= (*itr)->getFileEntry()->getLength();
}
}
if(!reading) {
throw new DlAbortEx(EX_FILE_OFFSET_OUT_OF_RANGE, offset);
}
unsigned char hashValue[20];
ctx.digestFinal(hashValue);
return Util::toHex(hashValue, 20);
}
bool MultiDiskAdaptor::fileExists()
{
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
if((*itr)->fileExists(getTopDirPath())) {
return true;
}
}
return false;
}
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