From e1a4c8871abb22275ceca03a0530e6b19ce8be6d Mon Sep 17 00:00:00 2001
From: Peter Kjellerstedt <pkj@axis.com>
Date: Wed, 17 Jun 2009 15:37:53 +0200
Subject: [PATCH] rtsp: Improved base64 decoding in fill_bytes().

The base64 decoding in fill_bytes() expected the size of the read data to
be evenly divisible by four (which is true for the base64 encoded data
itself). This did not, however, take whitespace (especially line breaks)
into account and would fail the decoding if any whitespace was present.
---
 gst-libs/gst/rtsp/gstrtspconnection.c | 33 ++++++++++++++-------------------
 1 file changed, 14 insertions(+), 19 deletions(-)

diff --git a/gst-libs/gst/rtsp/gstrtspconnection.c b/gst-libs/gst/rtsp/gstrtspconnection.c
index 00b6b5d..6f716b6 100644
--- a/gst-libs/gst/rtsp/gstrtspconnection.c
+++ b/gst-libs/gst/rtsp/gstrtspconnection.c
@@ -99,9 +99,7 @@ typedef struct
 {
   gint state;
   guint save;
-  gchar in[4];
-  guint cin;
-  gchar out[3];
+  guchar out[3];                /* the size must be evenly divisible by 3 */
   guint cout;
   guint coutl;
 } DecodeCtx;
@@ -1026,36 +1024,33 @@ fill_bytes (gint fd, guint8 * buffer, guint size, DecodeCtx * ctx)
   gint out = 0;
 
   if (ctx) {
-    gint r;
-
     while (size > 0) {
+      guint8 in[sizeof (ctx->out) * 4 / 3];
+      gint r;
+
       while (size > 0 && ctx->cout < ctx->coutl) {
         /* we have some leftover bytes */
-        *buffer++ = ctx->out[ctx->cout];
-        ctx->cout++;
+        *buffer++ = ctx->out[ctx->cout++];
         size--;
         out++;
       }
-      /* nothing in the buffer */
+
+      /* got what we needed? */
       if (size == 0)
         break;
 
       /* try to read more bytes */
-      r = READ_SOCKET (fd, &ctx->in[ctx->cin], 4 - ctx->cin);
+      r = READ_SOCKET (fd, in, sizeof (in));
       if (r <= 0) {
         if (out == 0)
           out = r;
         break;
       }
 
-      ctx->cin += r;
-      if (ctx->cin == 4) {
-        r = g_base64_decode_step ((const gchar *) ctx->in, 4,
-            (guchar *) ctx->out, &ctx->state, &ctx->save);
-        ctx->cout = 0;
-        ctx->coutl = r;
-        ctx->cin = 0;
-      }
+      ctx->cout = 0;
+      ctx->coutl =
+          g_base64_decode_step ((gchar *) in, r, ctx->out, &ctx->state,
+          &ctx->save);
     }
   } else {
     out = READ_SOCKET (fd, buffer, size);
@@ -2619,9 +2614,9 @@ gst_rtsp_connection_do_tunnel (GstRTSPConnection * conn,
 
   /* we need base64 decoding for the readfd */
   conn->ctx.state = 0;
-  conn->ctx.cin = 0;
-  conn->ctx.cout = 3;
   conn->ctx.save = 0;
+  conn->ctx.cout = 0;
+  conn->ctx.coutl = 0;
   conn->ctxp = &conn->ctx;
 
   return GST_RTSP_OK;
-- 
2.7.4