From ad916e61c9187067de3f0eaf255f2680d9fc8d9b Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Wed, 19 Jun 2019 12:00:47 +1000
Subject: [PATCH] io: add iterative file reading helper

---
 io.hpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/io.hpp b/io.hpp
index bf8aef17..347a67c5 100644
--- a/io.hpp
+++ b/io.hpp
@@ -131,6 +131,24 @@ namespace cruft {
     }
 
 
+    ///------------------------------------------------------------------------
+    /// Read the number of bytes covered by the destination view from the
+    /// source descriptor.
+    template <typename SrcT>
+    decltype (auto)
+    read (SrcT &&src, cruft::view<u08*> dst)
+    {
+        auto remain = dst;
+
+        while (!remain.empty ()) {
+            auto const count = src.read (remain.begin (), remain.size () * sizeof (decltype(dst)::value_type));
+            remain = remain.consume (count);
+        }
+
+        return dst;
+    }
+
+
     ///////////////////////////////////////////////////////////////////////////
     class indenter : public std::streambuf {
     protected: