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filter_fileio.cpp
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filter_fileio.cpp
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#include "filter.hpp"
#include "tar/ustar.h"
#include <sstream>
#include <cstdio>
#include <fstream>
#include <iostream>
#include <sstream>
using namespace std;
namespace Moviesoap
{
/* Calculate size of meta file (meta + mod descriptions) */
size_t Filter::metaSize()
{
size_t size = 0;
// calc length of filter meta + "\n"
size += 1 + creator.length();
size += 1 + title.length();
size += 1 + imdb.length();
size += 1 + year.length();
// calc length of mod descriptions + "\n"
for (list<Mod>::iterator iter = modList.begin(); iter != modList.end(); iter++) {
size += 1 + iter->description.length(); // the +1 is for the endl char, which we'll write in the next loop
}
return size;
}
// FILE IO
/* Write filter's text data (meta & mod descriptions) to outstream */
int Filter::metaOut(ofstream & outs)
{
// make header
Entrity::Ustar::Header header("meta.txt", metaSize());
// write tar header
header.out(outs);
// write file meta
outs << creator << endl;
outs << title << endl;
outs << imdb << endl;
outs << year << endl;
// write mod descriptions
for (list<Mod>::iterator iter = modList.begin(); iter != modList.end(); iter++) {
outs << iter->description << endl;
if (!outs) return MOVIESOAP_EFILEIO;
}
// write padding
header.pad(outs);
return outs ? MOVIESOAP_SUCCESS : MOVIESOAP_EFILEIO;
}
int Filter::metaIn(istream & ins)
{
// find archive header
string filename = "version.txt";
Entrity::Ustar::Header * p_header = Entrity::Ustar::Header::find(ins, filename);
if (p_header == NULL) return MOVIESOAP_EFIO_WRNG_HDR;
// read file meta
getline(ins, creator);
getline(ins, title);
getline(ins, imdb);
getline(ins, year);
if (!ins) return MOVIESOAP_EFILEIO;
// read mod descriptions
for (list<Mod>::iterator iter = modList.begin(); iter != modList.end(); iter++) {
getline(ins, iter->description);
if (ins.eof()) break;
if (!ins) return MOVIESOAP_EFILEIO;
}
// seek past padding
ins.seekg(p_header->padding(), ios::cur);
// cleanup & return
delete p_header;
return MOVIESOAP_SUCCESS;
}
/* Write filters mod data to outstream */
int Filter::dataOut(ofstream & outs)
{
list<Mod>::iterator iter;
// calculate date size
unsigned int size = sizeof(moviesoap_mod_t) * modList.size();
// make header
Entrity::Ustar::Header header("data", size);
// write header
header.out(outs);
// write data
for (iter = modList.begin(); iter != modList.end(); iter++) {
outs.write((char *) &iter->mod, sizeof(moviesoap_mod_t));
if (!outs) return MOVIESOAP_EFILEIO;
}
// write padding
header.pad(outs);
// return
return outs ? MOVIESOAP_SUCCESS : MOVIESOAP_EFILEIO;
}
/* Read mods from tar file. Return err/success */
int Filter::dataIn(istream & ins)
{
// find archive header
string filename = "data";
Entrity::Ustar::Header * p_header = Entrity::Ustar::Header::find(ins, filename);
if (p_header == NULL) return MOVIESOAP_EFIO_WRNG_HDR;
// calc number of mods
size_t mods_n = p_header->size() / sizeof(moviesoap_mod_t);
// push new mods onto list
for (size_t i = 0; i < mods_n; i++ ) {
if (!ins) return MOVIESOAP_EFILEIO;
modList.push_back( Mod(ins) );
}
// seek past padding
ins.seekg(p_header->padding(), ios::cur);
// cleanup & return
delete p_header;
return MOVIESOAP_SUCCESS;
}
/* Write version number to archive file */
int Filter::versionOut(ofstream & outs)
{
// prepare string representation of version
version = MOVIESOAP_VERSION;
// calculate size
size_t size = 1 + version.length();
// make header
Entrity::Ustar::Header header("version.txt", size);
// write header
header.out(outs);
// write archive content
outs << version << endl;
// write padding
header.pad(outs);
return outs ? MOVIESOAP_SUCCESS : MOVIESOAP_EFILEIO;
}
/* Read status from tar file. Return err/success */
int Filter::versionIn(istream & ins)
{
// find archive header
string filename = "version.txt";
Entrity::Ustar::Header * p_header = Entrity::Ustar::Header::find(ins, filename);
if (p_header == NULL) return MOVIESOAP_EFIO_WRNG_HDR;
// read archive content
getline(ins, version);
if (!ins) return MOVIESOAP_EFILEIO;
// seek past padding
ins.seekg(p_header->padding(), ios::cur);
// cleanup & return
delete p_header;
return MOVIESOAP_SUCCESS;
}
/* Write filter to tar file. Return 0 if success. */
int Filter::save()
{
int status;
// open file
ofstream outs(filepath.c_str(), ios::binary );
// return failure if couldn't write to file
if (!outs.is_open()) return MOVIESOAP_ENOFILE;
// write version
status = versionOut(outs);
if (status) return status;
// write mods
status = dataOut(outs);
if (status) return status;
// write meta
status = metaOut(outs);
if (status) return status;
// write two empty blocks & close stream & return
for (int i=0; i < 512*2; i++) { outs.put(0); }
if (!outs) return MOVIESOAP_EFILEIO;
outs.close();
return MOVIESOAP_SUCCESS;
}
int Filter::load(const string & newfpath)
{
int status;
ifstream ins( newfpath.c_str(), ios::binary );
if (!ins.is_open()) return MOVIESOAP_ENOFILE;
// set filepath
filepath = newfpath;
// load version number
status = versionIn(ins);
if (status) return status;
// load mods
modList.clear();
status = dataIn(ins);
if (status) return status;
// load meta
status = metaIn(ins);
if (status) return status;
return MOVIESOAP_SUCCESS;
}
}