File.cpp

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/* 
 * Copyright (C) 2006-2010 Jacek Sieka, arnetheduck on gmail point com
 *
 * 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.
 */

#include "adchpp.h"

#include "File.h"

namespace adchpp {

using namespace std;

string File::read(uint32_t len) throw(FileException) {
    string tmp;
    tmp.resize(len);
    uint32_t x = read(&tmp[0], len);
    tmp.resize(x);
    return tmp;
}

#ifdef _WIN32

File::File(const string& aFileName, int access, int mode) throw(FileException) {
    dcassert(access == WRITE || access == READ || access == (READ | WRITE));

    int m = 0;
    if(mode & OPEN) {
        if(mode & CREATE) {
            m = (mode & TRUNCATE) ? CREATE_ALWAYS : OPEN_ALWAYS;
        } else {
            m = (mode & TRUNCATE) ? TRUNCATE_EXISTING : OPEN_EXISTING;
        }
    } else {
        if(mode & CREATE) {
            m = (mode & TRUNCATE) ? CREATE_ALWAYS : CREATE_NEW;
        } else {
            dcassert(0);
        }
    }
    int a = 0;
    if(access & READ)
        a |= GENERIC_READ;
    if(access & WRITE)
        a |= GENERIC_WRITE;

    h = ::CreateFile(aFileName.c_str(), a, FILE_SHARE_READ, NULL, m, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
    
    if(h == INVALID_HANDLE_VALUE) {
        throw FileException(Util::translateError(GetLastError()));
    }

}

int64_t File::getSize() {
    DWORD x;
    DWORD l = ::GetFileSize(h, &x);
    
    if( (l == INVALID_FILE_SIZE) && (GetLastError() != NO_ERROR))
        return -1;
    
    return (int64_t)l | ((int64_t)x)<<32;
}

int64_t File::getSize(const string& aFileName) {
    WIN32_FIND_DATA fd;
    HANDLE hFind;
    
    hFind = FindFirstFile(aFileName.c_str(), &fd);
    
    if (hFind == INVALID_HANDLE_VALUE) {
        return -1;
    } else {
        FindClose(hFind);
        return ((int64_t)fd.nFileSizeHigh << 32 | (int64_t)fd.nFileSizeLow);
    }
}

string File::getFilePath(const string& path) throw() {
    string::size_type i = path.find_last_of("\\/");
    return (i != string::npos) ? path.substr(0, i) : path;
}

string File::getFileName(const string& path) throw() {
    string::size_type i = path.find_last_of("\\/");
    return (i != string::npos) ? path.substr(i + 1) : path;
}

bool File::isAbsolutePath(const string& path) throw() {
    return (path.length() >= 3 && path[1] == ':' && (path[2] == '\\' || path[2] == '/')) ||
        (path.length() >= 1 && (path[0] == '\\' || path[0] == '/'));
}

void File::ensureDirectory(const string& aFile) throw() {
    string::size_type start = 0;
    
    while( (start = aFile.find_first_of("\\/", start)) != string::npos) {
        ::CreateDirectory(aFile.substr(0, start+1).c_str(), NULL);
        start++;
    }
}

#else // _WIN32

File::File(const string& aFileName, int access, int mode) throw(FileException) {
    dcassert(access == WRITE || access == READ || access == (READ | WRITE));
    
    int m = 0;
    if(access == READ)
        m |= O_RDONLY;
    else if(access == WRITE)
        m |= O_WRONLY;
    else
        m |= O_RDWR;
    
    if(mode & CREATE) {
        m |= O_CREAT;
    }
    if(mode & TRUNCATE) {
        m |= O_TRUNC;
    }
    h = open(aFileName.c_str(), m, S_IRUSR | S_IWUSR);
    if(h == -1)
        throw FileException("Could not open file");
}       

int64_t File::getSize() {
    struct stat s;
    if(fstat(h, &s) == -1)
        return -1;
    
    return (int64_t)s.st_size;
}

int64_t File::getSize(const string& aFileName) {
    struct stat s;
    if(stat(aFileName.c_str(), &s) == -1)
        return -1;
    
    return s.st_size;
}

string File::getFilePath(const string& path) throw() {
    string::size_type i = path.rfind('/');
    return (i != string::npos) ? path.substr(0, i) : path;
}

string File::getFileName(const string& path) throw() {
    string::size_type i = path.rfind('/');
    return (i != string::npos) ? path.substr(i + 1) : path;
}

bool File::isAbsolutePath(const string& path) throw() {
    return path.length() >= 1 && path[0] == '/';
}

void File::ensureDirectory(const string& aFile) throw() {
    string::size_type start = 0;
    
    while( (start = aFile.find('/', start)) != string::npos) {
        ::mkdir(aFile.substr(0, start+1).c_str(), S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
        start++;
    }
}
#endif

std::string File::makeAbsolutePath(const std::string& filename) {
    return makeAbsolutePath(Util::getAppPath() + PATH_SEPARATOR, filename);
}

std::string File::makeAbsolutePath(const std::string& path, const std::string& filename) {
    return isAbsolutePath(filename) ? filename : path + filename;
}

}