[vlc-devel] [PATCH 03/21] input/stream: stream-fragments: add helper to escape a fragment

[Filip Roséen]

Given the specification of stream-fragments, we will need to be able
to properly escape fragment data in order to implement the relevant
functionality.

This commit adds a helper function named EscapeFragment; the
associated documentation should provide deeper insight.
---
 src/input/stream.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/src/input/stream.c b/src/input/stream.c
index a16c675..0510adf 100644
--- a/src/input/stream.c
+++ b/src/input/stream.c
@@ -80,6 +80,20 @@ typedef struct stream_priv_t
 } stream_priv_t;
 
 /**
+ * \ingroup stream_fragments_internals
+ * \internal
+ *
+ * The function will escape the passed data so that it does not conflict
+ * with the \ref stream_fragments specification.
+ *
+ * \param out on success, *out will refer to an allocated string with the
+ *            result of the operation.
+ * \param data the data that is to be escaped.
+ * \return VLC_SUCCESS on success, negative value on error
+ **/
+static int EscapeFragment( char** out, char const* data );
+
+/**
  * Allocates a VLC stream object
  */
 stream_t *vlc_stream_CommonNew(vlc_object_t *parent,
@@ -706,3 +720,26 @@ int vlc_stream_ReadDir( stream_t *s, input_item_node_t *p_node )
 {
     return s->pf_readdir( s, p_node );
 }
+
+static int EscapeFragment( char** out, char const* data )
+{
+    size_t out_len = 0;
+
+    for( char const* src = data; *src; ++src )
+        out_len += ( *src == '#' ? 2 : 1 );
+
+    *out = malloc( out_len + 1 );
+
+    if( unlikely( !*out ) )
+        return VLC_ENOMEM;
+
+    (*out)[ out_len ] = '\0';
+
+    for( char* dst = *out; *data; )
+    {
+        if( ( *dst++ = *data++ ) == '#' )
+            *dst++ = '#';
+    }
+
+    return VLC_SUCCESS;
+}
-- 
2.9.2