util.cc

Linux下比较早的基于命令行的DVD播放器

//
// Copyright (c) 2002 by Istv醤 V醨adi
//
// This file is part of dxr3Player, a DVD player written specifically 
// for the DXR3 (aka Hollywood+) decoder card.

// 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 "Util.h"

#include <cstdio>
#include <cstdarg>
#include <cstring>
#include <ctime>

#include <unistd.h>
#include <sys/time.h>
#include <sys/stat.h>

//------------------------------------------------------------------------------

namespace {

millis_t getMillisForTimeval(const struct timeval& tv)
{
    millis_t millis = tv.tv_sec;

    millis *= 1000;
    millis += tv.tv_usec / 1000;

    return millis;
}

}

//------------------------------------------------------------------------------

millis_t Util::currentTimeMillis()
{
    struct timeval tv;
    
    gettimeofday(&tv, 0);

    return getMillisForTimeval(tv);
}

//------------------------------------------------------------------------------

bool Util::readLine(char* buffer, size_t length, FILE* file)
{
    bool commentLine = true;
    do {
        char* s = fgets(buffer, length, file);
        
        if (s==0) return false;
        
        if (*buffer != '#') {
            size_t lineLength = strlen(buffer);
            if (buffer[lineLength-1]=='\n') {
                buffer[lineLength-1] = '\0';
            }
            commentLine = false;
        }
    } while(commentLine);

    return true;
}

//------------------------------------------------------------------------------

unsigned Util::getLanguageCode(const char* language)
{
    if (language==0 || strlen(language)!=2) {
        return 0xffff;
    }

    unsigned l0 = language[0]; l0 &= 0xff;
    unsigned l1 = language[1]; l1 &= 0xff;

    if ( l0<'a' || l0>'z' || l1<'a' || l1>'z') {
        return 0xffff;
    } else {
        return ((l0<<8) | l1);
    }
}

//------------------------------------------------------------------------------

bool Util::makeDirectory(const char* path)
{
    char* lastSlash = strrchr(path, '/');

    if (lastSlash!=NULL && lastSlash!=path) {
        char buffer[256];

        unsigned length = lastSlash - path;
        if (length>=sizeof(buffer)) return false;

        memcpy(buffer, path, length);
        buffer[length] = '\0';
        
        if (!makeDirectory(buffer)) return false;
    }

    struct stat st;
    
    bool exists = stat(path, &st)==0;
    exists = exists && S_ISDIR(st.st_mode);
    exists = exists && (access(path, R_OK|X_OK)==0);

    if (!exists) {
        return mkdir(path, 0755)==0;
    } else {
        return true;
    }
}

//------------------------------------------------------------------------------