loadFromStream functions now explicitly reset the stream (seek(0)) before starting to read (#349)

src/SFML/Audio/SoundFile.cpp

@@ -164,6 +164,9 @@ bool SoundFile::openRead(InputStream& stream)
     m_stream.source = &stream;
     m_stream.size = stream.getSize();
 
+    // Make sure that the stream's reading position is at the beginning
+    stream.seek(0);
+
     // Open the sound file
     SF_INFO fileInfo;
     m_file = sf_open_virtual(&io, SFM_READ, &fileInfo, &m_stream);

src/SFML/Graphics/Font.cpp

@@ -194,6 +194,9 @@ bool Font::loadFromStream(InputStream& stream)
     }
     m_library = library;
 
+    // Make sure that the stream's reading position is at the beginning
+    stream.seek(0);
+
     // Prepare a wrapper for our stream, that we'll pass to FreeType callbacks
     FT_StreamRec* rec = new FT_StreamRec;
     std::memset(rec, 0, sizeof(*rec));

src/SFML/Graphics/ImageLoader.cpp

@@ -181,6 +181,9 @@ bool ImageLoader::loadImageFromStream(InputStream& stream, std::vector<Uint8>& p
     // Clear the array (just in case)
     pixels.clear();
 
+    // Make sure that the stream's reading position is at the beginning
+    stream.seek(0);
+
     // Setup the stb_image callbacks
     stbi_io_callbacks callbacks;
     callbacks.read = &read;

src/SFML/Graphics/Shader.cpp

@@ -76,6 +76,7 @@ namespace
         if (size > 0)
         {
             buffer.resize(static_cast<std::size_t>(size));
+            stream.seek(0);
             sf::Int64 read = stream.read(&buffer[0], size);
             success = (read == size);
         }