File.h

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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.
 */

#ifndef ADCHPP_FILE_H
#define ADCHPP_FILE_H

#include "Exception.h"
#include "Util.h"

#ifndef _WIN32
#include <sys/stat.h>
#include <fcntl.h>
#endif

namespace adchpp {

STANDARD_EXCEPTION(FileException);

class File
{
public:
    enum {
        READ = 0x01,
        WRITE = 0x02
    };
    
    enum {
        OPEN = 0x01,
        CREATE = 0x02,
        TRUNCATE = 0x04
    };

    ADCHPP_DLL File(const std::string& aFileName, int access, int mode = OPEN) throw(FileException);

    ADCHPP_DLL int64_t getSize();
    ADCHPP_DLL static int64_t getSize(const std::string& aFileName);

    ADCHPP_DLL std::string read(uint32_t len) throw(FileException);
    
    ADCHPP_DLL static std::string getFilePath(const std::string& name) throw();
    ADCHPP_DLL static std::string getFileName(const std::string& name) throw();
    ADCHPP_DLL static bool isAbsolutePath(const std::string& name) throw();

    ADCHPP_DLL static std::string makeAbsolutePath(const std::string& filename);
    ADCHPP_DLL static std::string makeAbsolutePath(const std::string& path, const std::string& filename);

    ADCHPP_DLL static void ensureDirectory(const std::string& aFile) throw();
    
#ifdef _WIN32
    void close() {
        if(h != INVALID_HANDLE_VALUE) {
            CloseHandle(h);
            h = INVALID_HANDLE_VALUE;
        }
    }
    
    int64_t getPos() {
        LONG x = 0;
        DWORD l = ::SetFilePointer(h, 0, &x, FILE_CURRENT);
        
        return (int64_t)l | ((int64_t)x)<<32;
    }       

    void setPos(int64_t pos) {
        LONG x = (LONG) (pos>>32);
        ::SetFilePointer(h, (DWORD)(pos & 0xffffffff), &x, FILE_BEGIN);
    }       
    void setEndPos(int64_t pos) {
        LONG x = (LONG) (pos>>32);
        ::SetFilePointer(h, (DWORD)(pos & 0xffffffff), &x, FILE_END);
    }       

    void movePos(int64_t pos) {
        LONG x = (LONG) (pos>>32);
        ::SetFilePointer(h, (DWORD)(pos & 0xffffffff), &x, FILE_CURRENT);
    }
    
    uint32_t read(void* buf, uint32_t len) throw(FileException) {
        DWORD x;
        if(!::ReadFile(h, buf, len, &x, NULL)) {
            throw(FileException(Util::translateError(GetLastError())));
        }
        return x;
    }

    void write(const void* buf, size_t len) throw(FileException) {
        DWORD x;
        if(!::WriteFile(h, buf, (DWORD)len, &x, NULL)) {
            throw FileException(Util::translateError(GetLastError()));
        }
        if(x < len) {
            throw FileException("Unable to write, disk full?");
        }
    }
    
    void setEOF() throw(FileException) {
        dcassert(h != NULL);
        if(!SetEndOfFile(h)) {
            throw FileException(Util::translateError(GetLastError()));
        }
    }

    static void deleteFile(const std::string& aFileName) { ::DeleteFile(aFileName.c_str()); };
    static void renameFile(const std::string& source, const std::string& target) { ::MoveFile(source.c_str(), target.c_str()); };

#else // WIN32
    
    void close() {
        if(h != -1) {
			::close(h);
            h = -1;
        }
    }

    int64_t getPos() { return (int64_t) lseek(h, 0, SEEK_CUR); }

    void setPos(int64_t pos) { lseek(h, (off_t)pos, SEEK_SET); };
    void setEndPos(int64_t pos) { lseek(h, (off_t)pos, SEEK_END); };
    void movePos(int64_t pos) { lseek(h, (off_t)pos, SEEK_CUR); };

    uint32_t read(void* buf, uint32_t len) throw(FileException) {
        ssize_t x = ::read(h, buf, (size_t)len);
        if(x == -1)
            throw FileException(Util::translateError(errno));
        return (uint32_t)x;
    }
    
    void write(const void* buf, uint32_t len) throw(FileException) {
        ssize_t x;
        x = ::write(h, buf, len);
        if(x == -1)
            throw FileException(Util::translateError(errno));
        if(x < (ssize_t)len)
            throw FileException("Unable to write, disk full?");
    }

    void setEOF() throw(FileException) {
    }

    static void deleteFile(const std::string& aFileName) { ::unlink(aFileName.c_str()); };
    static void renameFile(const std::string& source, const std::string& target) { ::rename(source.c_str(), target.c_str()); };
    
#endif // WIN32

    ~File() {
        close();
    }

    std::string read() throw(FileException) {
        setPos(0);
        return read((uint32_t)getSize());
    }

    void write(const std::string& aString) throw(FileException) {
        write((void*)aString.data(), aString.size());
    }
        
private:
    File(const File&);
    File& operator=(const File&);
    
#ifdef _WIN32
    HANDLE h;
#else
    int h;
#endif

};

}

#endif // FILE_H