readfile: ensure blend header follows the spec

This commit is contained in:
Campbell Barton 2018-01-16 20:00:13 +11:00
parent e428ea3e00
commit 03223a5e7d
1 changed files with 33 additions and 29 deletions

View File

@ -41,6 +41,7 @@
#include <math.h> // for fabs
#include <stdarg.h> /* for va_start/end */
#include <time.h> /* for gmtime */
#include <ctype.h> /* for isdigit */
#include "BLI_utildefines.h"
#ifndef WIN32
@ -882,39 +883,42 @@ static void decode_blender_header(FileData *fd)
{
char header[SIZEOFBLENDERHEADER], num[4];
int readsize;
/* read in the header data */
readsize = fd->read(fd, header, sizeof(header));
if (readsize == sizeof(header)) {
if (STREQLEN(header, "BLENDER", 7)) {
fd->flags |= FD_FLAGS_FILE_OK;
/* what size are pointers in the file ? */
if (header[7]=='_') {
fd->flags |= FD_FLAGS_FILE_POINTSIZE_IS_4;
if (sizeof(void *) != 4) {
fd->flags |= FD_FLAGS_POINTSIZE_DIFFERS;
}
if (readsize == sizeof(header) &&
STREQLEN(header, "BLENDER", 7) &&
ELEM(header[7], '_', '-') &&
ELEM(header[8], 'v', 'V') &&
(isdigit(header[9]) && isdigit(header[10]) && isdigit(header[11])))
{
fd->flags |= FD_FLAGS_FILE_OK;
/* what size are pointers in the file ? */
if (header[7] == '_') {
fd->flags |= FD_FLAGS_FILE_POINTSIZE_IS_4;
if (sizeof(void *) != 4) {
fd->flags |= FD_FLAGS_POINTSIZE_DIFFERS;
}
else {
if (sizeof(void *) != 8) {
fd->flags |= FD_FLAGS_POINTSIZE_DIFFERS;
}
}
/* is the file saved in a different endian
* than we need ?
*/
if (((header[8] == 'v') ? L_ENDIAN : B_ENDIAN) != ENDIAN_ORDER) {
fd->flags |= FD_FLAGS_SWITCH_ENDIAN;
}
/* get the version number */
memcpy(num, header + 9, 3);
num[3] = 0;
fd->fileversion = atoi(num);
}
else {
if (sizeof(void *) != 8) {
fd->flags |= FD_FLAGS_POINTSIZE_DIFFERS;
}
}
/* is the file saved in a different endian
* than we need ?
*/
if (((header[8] == 'v') ? L_ENDIAN : B_ENDIAN) != ENDIAN_ORDER) {
fd->flags |= FD_FLAGS_SWITCH_ENDIAN;
}
/* get the version number */
memcpy(num, header + 9, 3);
num[3] = 0;
fd->fileversion = atoi(num);
}
}