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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 "AbstractDiskWriter.h"
#include "DlAbortEx.h"
#include "File.h"
#include "Util.h"
#include "message.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
AbstractDiskWriter::AbstractDiskWriter():fd(0) {
#ifdef ENABLE_MESSAGE_DIGEST
ctx.setAlgo(MessageDigestContext::ALGO_SHA1);
digestInit(ctx);
#endif // ENABLE_MESSAGE_DIGEST
}
AbstractDiskWriter::~AbstractDiskWriter() {
closeFile();
#ifdef ENABLE_MESSAGE_DIGEST
digestFree(ctx);
#endif // ENABLE_MESSAGE_DIGEST
}
void AbstractDiskWriter::openFile(const string& filename) {
File f(filename);
if(f.exists()) {
openExistingFile(filename);
} else {
initAndOpenFile(filename);
}
}
void AbstractDiskWriter::closeFile() {
if(fd >= 0) {
close(fd);
fd = -1;
}
}
void AbstractDiskWriter::openExistingFile(const string& filename) {
this->filename = filename;
File f(filename);
if(!f.isFile()) {
throw new DlAbortEx(EX_FILE_OPEN, filename.c_str(), "file not found");
}
if((fd = open(filename.c_str(), O_RDWR, S_IRUSR|S_IWUSR)) < 0) {
throw new DlAbortEx(EX_FILE_OPEN, filename.c_str(), strerror(errno));
}
}
void AbstractDiskWriter::createFile(const string& filename, int addFlags) {
this->filename = filename;
// TODO proper filename handling needed
assert(filename.size());
// if(filename.empty()) {
// filename = "index.html";
// }
if((fd = open(filename.c_str(), O_CREAT|O_RDWR|O_TRUNC|addFlags, S_IRUSR|S_IWUSR)) < 0) {
throw new DlAbortEx(EX_FILE_OPEN, filename.c_str(), strerror(errno));
}
}
void AbstractDiskWriter::writeDataInternal(const char* data, int len) {
if(write(fd, data, len) < 0) {
throw new DlAbortEx(EX_FILE_WRITE, filename.c_str(), strerror(errno));
}
}
int AbstractDiskWriter::readDataInternal(char* data, int len) {
int ret;
if((ret = read(fd, data, len)) < 0) {
throw new DlAbortEx(EX_FILE_READ, filename.c_str(), strerror(errno));
}
return ret;
}
string AbstractDiskWriter::sha1Sum(long long int offset, long long int length) {
#ifdef ENABLE_MESSAGE_DIGEST
digestReset(ctx);
try {
int BUFSIZE = 16*1024;
char buf[BUFSIZE];
for(int i = 0; i < length/BUFSIZE; i++) {
if(BUFSIZE != readData(buf, BUFSIZE, offset)) {
throw string("error");
}
digestUpdate(ctx, buf, BUFSIZE);
offset += BUFSIZE;
}
int r = length%BUFSIZE;
if(r > 0) {
if(r != readData(buf, r, offset)) {
throw string("error");
}
digestUpdate(ctx, buf, r);
}
unsigned char hashValue[20];
digestFinal(ctx, hashValue);
return Util::toHex(hashValue, 20);
} catch(string ex) {
throw new DlAbortEx(EX_FILE_SHA1SUM, filename.c_str(), strerror(errno));
}
#else
return "";
#endif // ENABLE_MESSAGE_DIGEST
}
void AbstractDiskWriter::seek(long long int offset) {
if(offset != lseek(fd, offset, SEEK_SET)) {
throw new DlAbortEx(EX_FILE_SEEK, filename.c_str(), strerror(errno));
}
}
void AbstractDiskWriter::writeData(const char* data, int len, long long int offset) {
seek(offset);
writeDataInternal(data, len);
}
int AbstractDiskWriter::readData(char* data, int len, long long int offset) {
seek(offset);
return readDataInternal(data, len);
}
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