From 0f9cfacd6cc45f78f1453a8eeb7ffa542dc5dc48 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 15 Jul 2015 18:43:03 +0200
Subject: Implement SQLite incremental BLOB/TEXT I/O

---
 odb/sqlite/stream.hxx | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 odb/sqlite/stream.hxx

(limited to 'odb/sqlite/stream.hxx')

diff --git a/odb/sqlite/stream.hxx b/odb/sqlite/stream.hxx
new file mode 100644
index 0000000..387dcf0
--- /dev/null
+++ b/odb/sqlite/stream.hxx
@@ -0,0 +1,82 @@
+// file      : odb/sqlite/stream.hxx
+// copyright : Copyright (c) 2005-2015 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_SQLITE_STREAM_HXX
+#define ODB_SQLITE_STREAM_HXX
+
+#include <odb/pre.hxx>
+
+#include <sqlite3.h>
+
+#include <cstddef>   // std::size_t
+
+#include <odb/sqlite/connection.hxx>
+#include <odb/sqlite/details/export.hxx>
+
+namespace odb
+{
+  namespace sqlite
+  {
+    // SQLite incremental BLOB/TEXT I/O stream. Available since
+    // SQLite 3.4.0.
+    //
+    class LIBODB_SQLITE_EXPORT stream: public active_object
+    {
+    public:
+      stream (const char* db,
+              const char* table,
+              const char* column,
+              long long rowid,
+              bool rw);
+
+      std::size_t
+      size () const;
+
+      // The following two functions throw std::invalid_argument if
+      // offset + n is past size().
+      //
+      void
+      read (void* buf, std::size_t n, std::size_t offset = 0);
+
+      void
+      write (const void* buf, std::size_t n, std::size_t offset = 0);
+
+      sqlite3_blob*
+      handle () const {return h_;}
+
+      // Close without reporting errors, if any.
+      //
+      virtual
+      ~stream () {close (false);}
+
+      // Close, by default with reporting errors, if any.
+      //
+      void
+      close (bool check = true);
+
+      // Open the same BLOB but in a different row. Can be faster
+      // than creating a new stream instance. Note that the stream
+      // must be in the open state prior to calling this function.
+      // Only available since SQLite 3.7.4.
+      //
+#if SQLITE_VERSION_NUMBER >= 3007004
+      void
+      reopen (long long rowid);
+#endif
+
+    protected:
+      // The active_object interface.
+      //
+      virtual void
+      clear ();
+
+    private:
+      sqlite3_blob* h_;
+    };
+  }
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_SQLITE_STREAM_HXX
-- 
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