vlc/vlc-3.0 | branch: master | Francois Cartegnie <fcvlc...@free.fr> | Wed Jan 
15 16:22:37 2020 +0100| [a9b4ad073aa476a48a010db81a4aace14f96d619] | committer: 
Francois Cartegnie

demux: webvtt: fix memstream usage

refs #21326

(cherry picked from commit 04fc9a272cf821455a12d7d2855bd226375d2d54)

> http://git.videolan.org/gitweb.cgi/vlc/vlc-3.0.git/?a=commit;h=a9b4ad073aa476a48a010db81a4aace14f96d619
---

 modules/demux/webvtt.c | 44 +++++++++++++++++++++++++++++---------------
 1 file changed, 29 insertions(+), 15 deletions(-)

diff --git a/modules/demux/webvtt.c b/modules/demux/webvtt.c
index ae672f9695..11b978a41e 100644
--- a/modules/demux/webvtt.c
+++ b/modules/demux/webvtt.c
@@ -138,26 +138,32 @@ static block_t *ConvertWEBVTT( const webvtt_cue_t *p_cue, 
bool b_continued )
         return NULL;
 }
 
-static void memstream_Append( struct vlc_memstream *ms, const char *psz )
+struct memstream_wrap
 {
-    if( ms->stream != NULL )
+    struct vlc_memstream memstream;
+    bool b_opened;
+};
+
+static void memstream_Append( struct memstream_wrap *mw, const char *psz )
+{
+    if( mw->b_opened )
     {
-        vlc_memstream_puts( ms, psz );
-        vlc_memstream_putc( ms, '\n' );
+        vlc_memstream_puts( &mw->memstream, psz );
+        vlc_memstream_putc( &mw->memstream, '\n' );
     }
 }
 
-static void memstream_Grab( struct vlc_memstream *ms, void **pp, size_t *pi )
+static void memstream_Grab( struct memstream_wrap *mw, void **pp, size_t *pi )
 {
-    if( ms->stream != NULL && vlc_memstream_close( ms ) == VLC_SUCCESS )
+    if( mw->b_opened && vlc_memstream_close( &mw->memstream ) == VLC_SUCCESS )
     {
-        if( ms->length == 0 )
+        if( mw->memstream.length == 0 )
         {
-            free( ms->ptr );
-            ms->ptr = NULL;
+            free( mw->memstream.ptr );
+            mw->memstream.ptr = NULL;
         }
-        *pp = ms->ptr;
-        *pi = ms->length;
+        *pp = mw->memstream.ptr;
+        *pi = mw->memstream.length;
     }
 }
 
@@ -167,7 +173,7 @@ static void memstream_Grab( struct vlc_memstream *ms, void 
**pp, size_t *pi )
 struct callback_ctx
 {
     demux_t *p_demux;
-    struct vlc_memstream regions, styles;
+    struct memstream_wrap regions, styles;
     bool b_ordered;
 };
 
@@ -379,8 +385,8 @@ static int ReadWEBVTT( demux_t *p_demux )
     if( p_parser == NULL )
         return VLC_EGENERIC;
 
-    (void) vlc_memstream_open( &ctx.regions );
-    (void) vlc_memstream_open( &ctx.styles );
+    ctx.regions.b_opened = !vlc_memstream_open( &ctx.regions.memstream );
+    ctx.styles.b_opened = !vlc_memstream_open( &ctx.styles.memstream );
 
     char *psz_line;
     while( (psz_line = vlc_stream_ReadLine( p_demux->s )) )
@@ -412,7 +418,15 @@ static void MakeExtradata( demux_sys_t *p_sys, void 
**p_extra, size_t *pi_extra
                                      p_sys->regions_headers.i_data );
     vlc_memstream_write( &extradata, p_sys->styles_headers.p_data,
                                      p_sys->styles_headers.i_data );
-    memstream_Grab( &extradata, p_extra, pi_extra );
+    if( vlc_memstream_close( &extradata ) == VLC_SUCCESS )
+    {
+        if( extradata.length )
+        {
+            *p_extra = extradata.ptr;
+            *pi_extra = extradata.length;
+        }
+        else free( extradata.ptr );
+    }
 }
 
 /*****************************************************************************

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