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/*
* 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) 2004 Blender Foundation
* All rights reserved.
* .blend file reading entry point
*/
/** \file
* \ingroup blenloader
*/
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* open/close */
#ifndef _WIN32
# include <unistd.h>
#else
# include <io.h>
#endif
#include "MEM_guardedalloc.h"
#include "DNA_listBase.h"
#include "BLI_blenlib.h"
#include "BLO_readfile.h"
#include "BLO_undofile.h"
#include "BKE_main.h"
/* keep last */
#include "BLI_strict_flags.h"
/* **************** support for memory-write, for undo buffers *************** */
/* not memfile itself */
void BLO_memfile_free(MemFile *memfile)
{
MemFileChunk *chunk;
while ((chunk = BLI_pophead(&memfile->chunks))) {
if (chunk->is_identical == false) {
MEM_freeN((void *)chunk->buf);
}
MEM_freeN(chunk);
}
memfile->size = 0;
}
/* to keep list of memfiles consistent, 'first' is always first in list */
/* result is that 'first' is being freed */
void BLO_memfile_merge(MemFile *first, MemFile *second)
{
MemFileChunk *fc, *sc;
fc = first->chunks.first;
sc = second->chunks.first;
while (fc || sc) {
if (fc && sc) {
if (sc->is_identical) {
sc->is_identical = false;
fc->is_identical = true;
}
}
if (fc) {
fc = fc->next;
}
if (sc) {
sc = sc->next;
}
}
BLO_memfile_free(first);
}
/* Clear is_identical_future before adding next memfile. */
void BLO_memfile_clear_future(MemFile *memfile)
{
LISTBASE_FOREACH (MemFileChunk *, chunk, &memfile->chunks) {
chunk->is_identical_future = false;
}
}
void memfile_chunk_add(MemFile *memfile, const char *buf, uint size, MemFileChunk **compchunk_step)
{
MemFileChunk *curchunk = MEM_mallocN(sizeof(MemFileChunk), "MemFileChunk");
curchunk->size = size;
curchunk->buf = NULL;
curchunk->is_identical = false;
/* This is unsafe in the sense that an app handler or other code that does not
* perform an undo push may make changes after the last undo push that
* will then not be undo. Though it's not entirely clear that is wrong behavior. */
curchunk->is_identical_future = true;
BLI_addtail(&memfile->chunks, curchunk);
/* we compare compchunk with buf */
if (*compchunk_step != NULL) {
MemFileChunk *compchunk = *compchunk_step;
if (compchunk->size == curchunk->size) {
if (memcmp(compchunk->buf, buf, size) == 0) {
curchunk->buf = compchunk->buf;
curchunk->is_identical = true;
compchunk->is_identical_future = true;
}
}
*compchunk_step = compchunk->next;
}
/* not equal... */
if (curchunk->buf == NULL) {
char *buf_new = MEM_mallocN(size, "Chunk buffer");
memcpy(buf_new, buf, size);
curchunk->buf = buf_new;
memfile->size += size;
}
}
struct Main *BLO_memfile_main_get(struct MemFile *memfile,
struct Main *oldmain,
struct Scene **r_scene)
{
struct Main *bmain_undo = NULL;
BlendFileData *bfd = BLO_read_from_memfile(oldmain,
BKE_main_blendfile_path(oldmain),
memfile,
&(const struct BlendFileReadParams){0},
NULL);
if (bfd) {
bmain_undo = bfd->main;
if (r_scene) {
*r_scene = bfd->curscene;
}
MEM_freeN(bfd);
}
return bmain_undo;
}
/**
* Saves .blend using undo buffer.
*
* \return success.
*/
bool BLO_memfile_write_file(struct MemFile *memfile, const char *filename)
{
MemFileChunk *chunk;
int file, oflags;
/* note: This is currently used for autosave and 'quit.blend',
* where _not_ following symlinks is OK,
* however if this is ever executed explicitly by the user,
* we may want to allow writing to symlinks.
*/
oflags = O_BINARY | O_WRONLY | O_CREAT | O_TRUNC;
#ifdef O_NOFOLLOW
/* use O_NOFOLLOW to avoid writing to a symlink - use 'O_EXCL' (CVE-2008-1103) */
oflags |= O_NOFOLLOW;
#else
/* TODO(sergey): How to deal with symlinks on windows? */
# ifndef _MSC_VER
# warning "Symbolic links will be followed on undo save, possibly causing CVE-2008-1103"
# endif
#endif
file = BLI_open(filename, oflags, 0666);
if (file == -1) {
fprintf(stderr,
"Unable to save '%s': %s\n",
filename,
errno ? strerror(errno) : "Unknown error opening file");
return false;
}
for (chunk = memfile->chunks.first; chunk; chunk = chunk->next) {
if ((size_t)write(file, chunk->buf, chunk->size) != chunk->size) {
break;
}
}
close(file);
if (chunk) {
fprintf(stderr,
"Unable to save '%s': %s\n",
filename,
errno ? strerror(errno) : "Unknown error writing file");
return false;
}
return true;
}
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