static int _mvefile_fetch_next_chunk(MVEFILE *movie)
{
unsigned char buffer[4];
unsigned short length;
/* fail if not open */
if (! movie->stream)
return 0;
/* fail if we can't read the next segment descriptor */
if (! mve_read(movie->stream, buffer, 4))
return 0;
/* pull out the next length */
length = _mve_get_short(buffer);
/* make sure we've got sufficient space */
_mvefile_set_buffer_size(movie, length);
/* read the chunk */
if (! mve_read(movie->stream, &movie->cur_chunk[0], length))
return 0;
movie->cur_chunk.resize(length);
movie->next_segment = 0;
return 1;
}
void mvefile_reset (MVEFILE *file)
{
_mvefile_reset (file);
// initialize the file
_mvefile_set_buffer_size (file, 1024);
// verify the file's header
if (!_mvefile_read_header (file)) {
_mvefile_free (file);
//return NULL;
}
// now, prefetch the next chunk
_mvefile_fetch_next_chunk (file);
}
/*
* reset a MVE file
*/
static void mvefile_reset(MVEFILE *file)
{
/* initialize the file */
_mvefile_set_buffer_size(file, 1024);
/* verify the file's header */
if (! _mvefile_read_header(file))
{
*file = {};
}
/* now, prefetch the next chunk */
_mvefile_fetch_next_chunk(file);
}
MVEFILE *mvefile_open (void *stream)
{
MVEFILE *file;
// create the file
file = _mvefile_alloc ();
if (!_mvefile_open (file, stream)) {
_mvefile_free (file);
return NULL;
}
// initialize the file
_mvefile_set_buffer_size (file, 1024);
// verify the file's header
if (!_mvefile_read_header (file)) {
_mvefile_free (file);
return NULL;
}
// now, prefetch the next chunk
_mvefile_fetch_next_chunk (file);
return file;
}
static int _mvefile_fetch_next_chunk (MVEFILE *movie)
{
unsigned char buffer[4];
unsigned short length;
// fail if not open
if (!movie->stream)
return 0;
// fail if we can't read the next tSegment descriptor
if (!mve_read (movie->stream, buffer, 4))
return 0;
// pull out the next length
length = _mve_get_short (buffer);
// make sure we've got sufficient space
_mvefile_set_buffer_size (movie, length);
// read the chunk
if (!mve_read (movie->stream, movie->cur_chunk, length))
return 0;
movie->cur_fill = length;
movie->next_segment = 0;
return 1;
}
/*
* open an MVE file
*/
std::unique_ptr<MVEFILE> mvefile_open(void *stream)
{
/* create the file */
auto file = make_unique<MVEFILE>();
if (! _mvefile_open(file.get(), stream))
{
return nullptr;
}
/* initialize the file */
_mvefile_set_buffer_size(file.get(), 1024);
/* verify the file's header */
if (! _mvefile_read_header(file.get()))
{
return nullptr;
}
/* now, prefetch the next chunk */
_mvefile_fetch_next_chunk(file.get());
return file;
}
