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#ifndef _FILELIB_H_
#define _FILELIB_H_
#include <cassert>
#include <string>
#include <iostream>
#include <cstdlib>
#include <boost/shared_ptr.hpp>
#include "gzstream.h"
bool FileExists(const std::string& file_name);
bool DirectoryExists(const std::string& dir_name);
// reads from standard in if filename is -
// uncompresses if file ends with .gz
// otherwise, reads from a normal file
struct file_null_deleter {
void operator()(void*) const {}
};
template <class Stream>
struct BaseFile {
typedef Stream S;
typedef boost::shared_ptr<Stream> PS;
void Reset() {
ps_.reset();
}
bool is_null() const { return !ps_; }
operator bool() const {
return ps_;
}
S* stream() { return ps_.get(); }
S* operator->() { return ps_.get(); } // compat with old ReadFile * -> new Readfile. remove?
S &get() const { return *ps_; }
bool is_std() {
return filename_=="-";
}
std::string filename_;
protected:
PS ps_;
static bool EndsWith(const std::string& f, const std::string& suf) {
return (f.size() > suf.size()) && (f.rfind(suf) == f.size() - suf.size());
}
};
class ReadFile : public BaseFile<std::istream> {
public:
ReadFile() { }
explicit ReadFile(const std::string& filename) {
Init(filename);
}
void Init(const std::string& filename) {
filename_=filename;
if (is_std()) {
ps_=PS(&std::cin,file_null_deleter());
} else {
if (!FileExists(filename)) {
std::cerr << "File does not exist: " << filename << std::endl;
abort();
}
char const* file=filename_.c_str(); // just in case the gzstream keeps using the filename for longer than the constructor, e.g. inflateReset2. warning in valgrind that I'm hoping will disappear - it makes no sense.
ps_=PS(EndsWith(filename, ".gz") ?
static_cast<std::istream*>(new igzstream(file)) :
static_cast<std::istream*>(new std::ifstream(file)));
if (!*ps_) {
std::cerr << "Failed to open " << filename << std::endl;
abort();
}
}
}
};
class WriteFile : public BaseFile<std::ostream> {
public:
WriteFile() {}
explicit WriteFile(std::string const& filename) { Init(filename); }
void Init(const std::string& filename) {
filename_=filename;
if (is_std()) {
ps_=PS(&std::cout,file_null_deleter());
} else {
char const* file=filename_.c_str(); // just in case the gzstream keeps using the filename for longer than the constructor, e.g. inflateReset2. warning in valgrind that I'm hoping will disappear - it makes no sense.
ps_=PS(EndsWith(filename, ".gz") ?
static_cast<std::ostream*>(new ogzstream(file)) :
static_cast<std::ostream*>(new std::ofstream(file)));
if (!*ps_) {
std::cerr << "Failed to open " << filename << std::endl;
abort();
}
}
}
~WriteFile() {
if (ps_)
get() << std::flush;
}
};
#endif
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