Add support for compressing/decompressing fdstreams with LZ4

Importing LZ4 code from version 1.9.3.

1 files changed, 47 insertions, 0 deletions

diff --git a/tests/lz4/driver.cxx b/tests/lz4/driver.cxx
new file mode 100644
index 0000000..e3da5e6
--- /dev/null
+++ b/tests/lz4/driver.cxx
@@ -0,0 +1,47 @@
+// file      : tests/lz4/driver.cxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#include <iostream>
+#include <exception>
+
+#include <libbutl/lz4.hxx>
+#include <libbutl/fdstream.mxx>
+#include <libbutl/filesystem.mxx> // entry_stat, path_entry()
+
+using namespace std;
+using namespace butl;
+
+// Usage: argv[0] [-c|-d] <input-file> <output-file>
+//
+int
+main (int argc, const char* argv[])
+try
+{
+  assert (argc == 4);
+
+  ifdstream ifs (argv[2], fdopen_mode::binary, ifdstream::badbit);
+  ofdstream ofs (argv[3], fdopen_mode::binary);
+
+  if (argv[1][1] == 'c')
+  {
+    // @@ TODO: would be nice to get it from fd.
+    //
+    entry_stat st (path_entry (argv[2], true /* follow_symlinks */).second);
+
+    lz4::compress (ofs, ifs,
+                   1 /* compression_level */,
+                   4 /* block_size_id (64KB) */,
+                   st.size);
+  }
+  else
+  {
+    lz4::decompress (ofs, ifs);
+  }
+
+  ofs.close ();
+}
+catch (const std::exception& e)
+{
+  cerr << e.what () << endl;
+  return 1;
+}