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/* <!-- copyright */
/*
* aria2 - a simple utility for downloading files faster
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* copyright --> */
#include "MultiDiskWriter.h"
#include "DlAbortEx.h"
#include "Util.h"
#include "message.h"
#include <errno.h>
MultiDiskWriter::MultiDiskWriter(int pieceLength):
pieceLength(pieceLength),
ctx(DIGEST_ALGO_SHA1) {
ctx.digestInit();
}
MultiDiskWriter::~MultiDiskWriter() {
clearEntries();
ctx.digestFree();
}
void MultiDiskWriter::clearEntries() {
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
delete *itr;
}
diskWriterEntries.clear();
}
void MultiDiskWriter::setFileEntries(const FileEntries& fileEntries) {
clearEntries();
for(FileEntries::const_iterator itr = fileEntries.begin();
itr != fileEntries.end(); itr++) {
diskWriterEntries.push_back(new DiskWriterEntry(*itr));
}
}
void MultiDiskWriter::openFile(const string& filename) {
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
(*itr)->diskWriter->openFile(filename+"/"+(*itr)->fileEntry.path);
}
}
// filename is a directory which is specified by the user in the option.
void MultiDiskWriter::initAndOpenFile(const string& filename) {
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
(*itr)->diskWriter->initAndOpenFile(filename+"/"+(*itr)->fileEntry.path);
}
}
void MultiDiskWriter::closeFile() {
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
(*itr)->diskWriter->closeFile();
}
}
void MultiDiskWriter::openExistingFile(const string& filename) {
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end(); itr++) {
(*itr)->diskWriter->openExistingFile(filename+"/"+(*itr)->fileEntry.path);
}
}
void MultiDiskWriter::writeData(const char* data, int len, long long int offset) {
long long int fileOffset = offset;
bool writing = false;
int rem = len;
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end() && rem != 0; itr++) {
if(isInRange(*itr, offset) || writing) {
int writeLength = calculateLength(*itr, fileOffset, rem);
(*itr)->diskWriter->writeData(data+(len-rem), writeLength, fileOffset);
rem -= writeLength;
writing = true;
fileOffset = 0;
} else {
fileOffset -= (*itr)->fileEntry.length;
}
}
if(!writing) {
throw new DlAbortEx(EX_FILE_OFFSET_OUT_OF_RANGE, offset);
}
}
bool MultiDiskWriter::isInRange(const DiskWriterEntry* entry, long long int offset) const {
return entry->fileEntry.offset <= offset &&
offset < entry->fileEntry.offset+entry->fileEntry.length;
}
int MultiDiskWriter::calculateLength(const DiskWriterEntry* entry, long long int fileOffset, int rem) const {
int length;
if(entry->fileEntry.length < fileOffset+rem) {
length = entry->fileEntry.length-fileOffset;
} else {
length = rem;
}
return length;
}
int MultiDiskWriter::readData(char* data, int len, long long int offset) {
long long int fileOffset = offset;
bool reading = false;
int rem = len;
int totalReadLength = 0;
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end() && rem != 0; itr++) {
if(isInRange(*itr, offset) || reading) {
int readLength = calculateLength((*itr), fileOffset, rem);
totalReadLength += (*itr)->diskWriter->readData(data+(len-rem), readLength, fileOffset);
rem -= readLength;
reading = true;
fileOffset = 0;
} else {
fileOffset -= (*itr)->fileEntry.length;
}
}
if(!reading) {
throw new DlAbortEx(EX_FILE_OFFSET_OUT_OF_RANGE, offset);
}
return totalReadLength;
}
void MultiDiskWriter::hashUpdate(DiskWriterEntry* entry, long long int offset, long long int length) {
int BUFSIZE = 16*1024;
char buf[BUFSIZE];
for(int i = 0; i < length/BUFSIZE; i++) {
if(BUFSIZE != entry->diskWriter->readData(buf, BUFSIZE, offset)) {
throw string("error");
}
ctx.digestUpdate(buf, BUFSIZE);
offset += BUFSIZE;
}
int r = length%BUFSIZE;
if(r > 0) {
if(r != entry->diskWriter->readData(buf, r, offset)) {
throw string("error");
}
ctx.digestUpdate(buf, r);
}
}
string MultiDiskWriter::sha1Sum(long long int offset, long long int length) {
long long int fileOffset = offset;
bool reading = false;
int rem = length;
ctx.digestReset();
try {
for(DiskWriterEntries::iterator itr = diskWriterEntries.begin();
itr != diskWriterEntries.end() && rem != 0; itr++) {
if(isInRange(*itr, offset) || reading) {
int readLength = calculateLength((*itr), fileOffset, rem);
hashUpdate(*itr, fileOffset, readLength);
rem -= readLength;
reading = true;
fileOffset = 0;
} else {
fileOffset -= (*itr)->fileEntry.length;
}
}
if(!reading) {
throw new DlAbortEx(EX_FILE_OFFSET_OUT_OF_RANGE, offset);
}
unsigned char hashValue[20];
ctx.digestFinal(hashValue);
return Util::toHex(hashValue, 20);
} catch(string ex) {
throw new DlAbortEx(EX_FILE_SHA1SUM, "", strerror(errno));
}
}
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