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/*
This file is part of Android File Transfer For Linux.
Copyright (C) 2015-2020 Vladimir Menshakov
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef AFTL_MTP_BACKEND_LINUX_USB_DIRECTORY_H
#define AFTL_MTP_BACKEND_LINUX_USB_DIRECTORY_H
#include <mtp/ByteArray.h>
#include <Exception.h>
#include <vector>
#include <sys/types.h>
#include <dirent.h>
#include <stdio.h>
#include <unistd.h>
#include <stddef.h>
namespace mtp { namespace usb
{
class File : Noncopyable
{
FILE *_f;
public:
File(const std::string &path) : _f(fopen(path.c_str(), "rb"))
{
if (!_f)
throw posix::Exception("open " + path);
}
~File()
{ fclose(_f); }
FILE *GetHandle()
{ return _f; }
std::string ReadLine(size_t bufSize = 1024)
{
std::vector<char> buf(bufSize);
if (!fgets(buf.data(), buf.size(), _f))
throw posix::Exception("fgets");
return buf.data();
}
ByteArray ReadAll()
{
static const size_t step = 4096;
fseek(_f, 0, SEEK_SET);
ByteArray buf;
size_t r;
do
{
size_t offset = buf.size();
buf.resize(offset + step);
r = fread(buf.data() + offset, 1, step, _f);
}
while(r == step);
buf.resize(buf.size() - step + r);
return buf;
}
int ReadInt(int base)
{
int r;
switch(base)
{
case 16: if (fscanf(_f, "%x", &r) != 1) throw std::runtime_error("cannot read number"); break;
case 10: if (fscanf(_f, "%d", &r) != 1) throw std::runtime_error("cannot read number"); break;
default: throw std::runtime_error("invalid base");
}
return r;
}
};
class Directory : Noncopyable
{
private:
DIR * _dir;
std::vector<u8> _buffer;
public:
Directory(const std::string &path): _dir(opendir(path.c_str()))
{
if (!_dir)
throw posix::Exception("opendir");
long name_max = pathconf(path.c_str(), _PC_NAME_MAX);
if (name_max == -1) /* Limit not defined, or error */
name_max = 255; /* Take a guess */
_buffer.resize(offsetof(struct dirent, d_name) + name_max + 1);
}
std::string Read()
{
dirent *entry;
#if 0
dirent *buffer = static_cast<dirent *>(static_cast<void *>(_buffer.data()));
//thread safety is not in posix yet, but those shitheads already deprecated it
int r = readdir_r(_dir, buffer, &entry);
#endif
entry = readdir(_dir);
return entry? entry->d_name: "";
}
~Directory()
{ closedir(_dir); }
static int ReadInt(const std::string &path, int base = 16)
{
File f(path);
return f.ReadInt(base);
}
static std::string ReadString(const std::string &path)
{
File f(path);
std::string str = f.ReadLine();
size_t end = str.find_last_not_of(" \t\r\n\f");
return end != str.npos? str.substr(0, end + 1): str;
}
static ByteArray ReadAll(const std::string &path)
{
File f(path);
return f.ReadAll();
}
};
}}
#endif /* DIRECTORY_H */
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