fixup! fixup! Add IStreamReader::getSize

Author: mgautierfr

test/istreamreader.cpp

@@ -80,7 +80,7 @@ TEST(IStreamReader, sub_reader_zero)
   EXPECT_EQ(buffer.size().v, N);
   EXPECT_EQ(0, memcmp(buffer.data(), zerobuf, N));
 }
-  
+
 TEST(IStreamReader, read_increasing)
 {
   InfiniteIncreasingStream iis;
@@ -103,7 +103,7 @@ TEST(IStreamReader, sub_reader_increasing)
   auto buffer = subReader->get_buffer(zim::offset_t(0), zim::zsize_t(N));
   EXPECT_EQ(buffer.size().v, N);
   EXPECT_EQ(0, memcmp(buffer.data(), refbuf, N));
-  
+
   buffer = subReader->get_buffer(zim::offset_t(5), zim::zsize_t(N-5));
   EXPECT_EQ(buffer.size().v, N-5);
   EXPECT_EQ(0, memcmp(buffer.data(), refbuf+5, N-5));