int attribute_align_arg mpg123_open_handle(mpg123_handle *mh, void *handle)
{
struct wrap_data* ioh;
if(mh == NULL) return MPG123_ERR;
mpg123_close(mh);
ioh = mh->wrapperdata;
if(ioh != NULL && ioh->iotype == IO_HANDLE && ioh->r_h_read != NULL)
{
/* Wrap the custom handle into my handle. */
int err;
err = MPG123_LARGENAME(mpg123_replace_reader_handle)(mh, wrap_read, wrap_lseek, wrap_io_cleanup);
if(err != MPG123_OK) return MPG123_ERR;
ioh->handle = handle;
/* No extra error handling, keep behaviour of the original open_handle. */
return open_stream_handle(mh, ioh);
}
else
{
/* This is an error ... you need to prepare the I/O before using it. */
mh->err = MPG123_BAD_CUSTOM_IO;
return MPG123_ERR;
}
}
int attribute_align_arg mpg123_open_fd(mpg123_handle *mh, int fd)
{
struct wrap_data* ioh;
if(mh == NULL) return MPG123_ERR;
mpg123_close(mh);
ioh = mh->wrapperdata;
if(ioh != NULL && ioh->iotype == IO_FD)
{
int err;
err = MPG123_LARGENAME(mpg123_replace_reader_handle)(mh, wrap_read, wrap_lseek, wrap_io_cleanup);
if(err != MPG123_OK) return MPG123_ERR;
/* The above call implied mpg123_close() already */
/* Store the real file descriptor inside the handle. */
ioh->fd = fd;
/* Initiate I/O operating on my handle now. */
err = open_stream_handle(mh, ioh);
if(err != MPG123_OK)
{
wrap_io_cleanup(ioh);
return MPG123_ERR;
}
/* All fine... */
return MPG123_OK;
}
else return MPG123_LARGENAME(mpg123_open_fd)(mh, fd);
}
int attribute_align_arg mpg123_open_handle(mpg123_handle *mh, void *iohandle)
{
if(mh == NULL) return MPG123_ERR;
mpg123_close(mh);
if(mh->rdat.r_read_handle == NULL)
{
mh->err = MPG123_BAD_CUSTOM_IO;
return MPG123_ERR;
}
return open_stream_handle(mh, iohandle);
}
/*
The open routines always need to watch out for a prepared wrapper handle to use replaced normal I/O.
Two cases to consider:
1. Plain normal open using internal I/O.
2. Client called mpg123_replace_reader() before.
The second case needs hackery to activate the client I/O callbacks. For that, we create a custom I/O handle and use the guts of mpg123_open_fd() on it.
*/
int attribute_align_arg mpg123_open(mpg123_handle *mh, const char *path)
{
struct wrap_data* ioh;
if(mh == NULL) return MPG123_ERR;
ioh = mh->wrapperdata;
/* Mimic the use of mpg123_replace_reader() functions by lower levels...
IO_HANDLE is not valid here, though. Only IO_FD. */
if(ioh != NULL && ioh->iotype == IO_FD)
{
int err;
err = MPG123_LARGENAME(mpg123_replace_reader_handle)(mh, wrap_read, wrap_lseek, wrap_io_cleanup);
if(err != MPG123_OK) return MPG123_ERR;
/* The above call implied mpg123_close() already */
/*
I really need to open the file here... to be able to use the replacer handle I/O ...
my_fd is used to indicate closing of the descriptor on cleanup.
*/
ioh->my_fd = compat_open(path, O_RDONLY|O_BINARY);
if(ioh->my_fd < 0)
{
if(!(mh->p.flags & MPG123_QUIET)) error2("Cannot open file %s: %s", path, strerror(errno));
mh->err = MPG123_BAD_FILE;
return MPG123_ERR;
}
/* Store a copy of the descriptor where it is actually used. */
ioh->fd = ioh->my_fd;
/* Initiate I/O operating on my handle now. */
err = open_stream_handle(mh, ioh);
if(err != MPG123_OK)
{
wrap_io_cleanup(ioh);
return MPG123_ERR;
}
/* All fine... */
return MPG123_OK;
}
else return MPG123_LARGENAME(mpg123_open)(mh, path);
}
