runtime.c

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/*
 * $Id: runtime.c 36620 2011-05-11 19:29:23Z blendix $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>

#ifdef WIN32
#include <io.h>         // read, open
#include "BLI_winstuff.h"
#else // ! WIN32
#include <unistd.h>             // read
#endif

#include "BLO_readfile.h"
#include "BLO_runtime.h"

#include "BKE_blender.h"
#include "BKE_report.h"
#include "BKE_utildefines.h"

#include "BLI_blenlib.h"

/* Runtime reading */

static int handle_read_msb_int(int handle)
{
        unsigned char buf[4];

        if(read(handle, buf, 4) != 4)
                return -1;

        return (buf[0]<<24) + (buf[1]<<16) + (buf[2]<<8) + (buf[3]<<0);
}

int BLO_is_a_runtime(char *path)
{
        int res= 0, fd= open(path, O_BINARY|O_RDONLY, 0);
        int datastart;
        char buf[8];

        if(fd==-1)
                goto cleanup;
        
        lseek(fd, -12, SEEK_END);
        
        datastart= handle_read_msb_int(fd);

        if(datastart==-1)
                goto cleanup;
        else if(read(fd, buf, 8)!=8)
                goto cleanup;
        else if(memcmp(buf, "BRUNTIME", 8)!=0)
                goto cleanup;
        else
                res= 1;

cleanup:
        if(fd!=-1)
                close(fd);

        return res;     
}

BlendFileData *BLO_read_runtime(char *path, ReportList *reports)
{
        BlendFileData *bfd= NULL;
        size_t actualsize;
        int fd, datastart;
        char buf[8];

        fd= open(path, O_BINARY|O_RDONLY, 0);

        if(fd==-1) {
                BKE_reportf(reports, RPT_ERROR, "Unable to open \"%s\": %s.", path, strerror(errno));
                goto cleanup;
        }
        
        actualsize= BLI_filesize(fd);

        lseek(fd, -12, SEEK_END);

        datastart= handle_read_msb_int(fd);

        if(datastart==-1) {
                BKE_reportf(reports, RPT_ERROR, "Unable to read  \"%s\" (problem seeking)", path);
                goto cleanup;
        }
        else if(read(fd, buf, 8)!=8) {
                BKE_reportf(reports, RPT_ERROR, "Unable to read  \"%s\" (truncated header)", path);
                goto cleanup;
        }
        else if(memcmp(buf, "BRUNTIME", 8)!=0) {
                BKE_reportf(reports, RPT_ERROR, "Unable to read  \"%s\" (not a blend file)", path);
                goto cleanup;
        }
        else {  
                //printf("starting to read runtime from %s at datastart %d\n", path, datastart);
                lseek(fd, datastart, SEEK_SET);
                bfd = blo_read_blendafterruntime(fd, path, actualsize-datastart, reports);
                fd= -1; // file was closed in blo_read_blendafterruntime()
        }
        
cleanup:
        if(fd!=-1)
                close(fd);
        
        return bfd;
}