meta_engine: taglib: add sequential read limit on VlcIostream

modules/meta_engine/taglib.cpp

@@ -92,6 +92,7 @@ using namespace TagLib;
 
 
 #include <algorithm>
+#include <limits>
 
 namespace VLCTagLib
 {
@@ -157,6 +158,8 @@ public:
         : m_stream( p_stream )
         , m_previousPos( 0 )
         , m_borked( false )
+        , m_seqReadLength( 0 )
+        , m_seqReadLimit( std::numeric_limits<long>::max() )
     {
     }
 
@@ -174,7 +177,7 @@ public:
 
     ByteVector readBlock(ulong length)
     {
-        if(m_borked)
+        if(m_borked || m_seqReadLength >= m_seqReadLimit)
            return ByteVector::null;
         ByteVector res(length, 0);
         ssize_t i_read = vlc_stream_Read( m_stream, res.data(), length);
@@ -183,6 +186,7 @@ public:
         else if ((size_t)i_read != length)
             res.resize(i_read);
         m_previousPos += i_read;
+        m_seqReadLength += i_read;
         return res;
     }
 
@@ -209,6 +213,11 @@ public:
         return true;
     }
 
+    void setMaxSequentialRead(long s)
+    {
+        m_seqReadLimit = s;
+    }
+
     void seek(long offset, Position p)
     {
         uint64_t pos = 0;
@@ -236,6 +245,7 @@ public:
         m_borked = (vlc_stream_Seek( m_stream, pos + offset ) != 0);
         if(!m_borked)
             m_previousPos = pos + offset;
+        m_seqReadLength = 0;
     }
 
     void clear()
@@ -264,6 +274,8 @@ private:
     stream_t* m_stream;
     int64_t m_previousPos;
     bool m_borked;
+    long m_seqReadLength;
+    long m_seqReadLimit;
 };
 
 static int ExtractCoupleNumberValues( vlc_meta_t* p_meta, const char *psz_value,