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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 {}
};
class ReadFile {
public:
typedef boost::shared_ptr<std::istream> PS;
ReadFile() { }
std::string filename_;
void Init(const std::string& filename) {
bool stdin=(filename == "-");
if (stdin) {
in_=PS(&std::cin,file_null_deleter());
} else {
if (!FileExists(filename)) {
std::cerr << "File does not exist: " << filename << std::endl;
abort();
}
filename_=filename;
in_.reset(EndsWith(filename, ".gz") ?
static_cast<std::istream*>(new igzstream(filename.c_str())) :
static_cast<std::istream*>(new std::ifstream(filename.c_str())));
if (!*in_) {
std::cerr << "Failed to open " << filename << std::endl;
abort();
}
}
}
void Reset() {
in_.reset();
}
bool is_null() const { return !in_; }
operator bool() const {
return in_;
}
explicit ReadFile(const std::string& filename) {
Init(filename);
}
~ReadFile() {
}
std::istream* stream() { return in_.get(); }
std::istream* operator->() { return in_.get(); } // compat with old ReadFile * -> new Readfile. remove?
std::istream &get() const { return *in_; }
private:
static bool EndsWith(const std::string& f, const std::string& suf) {
return (f.size() > suf.size()) && (f.rfind(suf) == f.size() - suf.size());
}
PS in_;
};
class WriteFile {
public:
WriteFile(const std::string& filename) :
no_delete_on_exit_(filename == "-"),
out_(no_delete_on_exit_ ? static_cast<std::ostream*>(&std::cout) :
(EndsWith(filename, ".gz") ?
static_cast<std::ostream*>(new ogzstream(filename.c_str())) :
static_cast<std::ostream*>(new std::ofstream(filename.c_str())))) {}
~WriteFile() {
(*out_) << std::flush;
if (!no_delete_on_exit_) delete out_;
}
inline std::ostream* stream() { return out_; }
std::ostream &get() const { return *out_; }
private:
static bool EndsWith(const std::string& f, const std::string& suf) {
return (f.size() > suf.size()) && (f.rfind(suf) == f.size() - suf.size());
}
const bool no_delete_on_exit_;
std::ostream* const out_;
};
#endif
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