Add support for compressing/decompressing fdstreams with LZ4

Importing LZ4 code from version 1.9.3.

6 files changed, 132 insertions, 0 deletions

diff --git a/tests/lz4/buildfile b/tests/lz4/buildfile
new file mode 100644
index 0000000..1f9a244
--- /dev/null
+++ b/tests/lz4/buildfile
@@ -0,0 +1,6 @@
+# file      : tests/lz4/buildfile
+# license   : MIT; see accompanying LICENSE file
+
+import libs = libbutl%lib{butl}
+
+exe{driver}: {hxx cxx}{*} $libs testscript file{*.lz4}
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;
+}
diff --git a/tests/lz4/testscript b/tests/lz4/testscript
new file mode 100644
index 0000000..1806c94
--- /dev/null
+++ b/tests/lz4/testscript
@@ -0,0 +1,78 @@
+# file      : tests/lz4/testscript
+# license   : MIT; see accompanying LICENSE file
+
++touch zero
++echo 'The quick brown fox jumps over the lazy dog.' >=small
++cat <<EOI >=1kb
+The quick brown fox jumps over the lazy dog. The quick brown fox jumps over
+the lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox
+jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The
+quick brown fox jumps over the lazy dog. The quick brown fox jumps over the
+lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox
+jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The
+quick brown fox jumps over the lazy dog. The quick brown fox jumps over the
+lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox
+jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The
+quick brown fox jumps over the lazy dog. The quick brown fox jumps over the
+lazy dog. The quick brown fox jumps over the lazy dog. The quick brown fox
+jumps over the lazy dog. The quick brown fox jumps over the lazy dog. The
+quick brown fox jumps over the lazy dog. The quick brown fox jumps over the
+lazy dog. The quick brown fox jumps over th
+EOI
++cat  1kb  1kb  1kb  1kb  1kb  1kb  1kb  1kb >=8kb
++cat  8kb  8kb  8kb  8kb  8kb  8kb  8kb  8kb >=64kb
++cat 64kb 64kb 64kb 64kb 64kb 64kb 64kb 64kb >=512kb
+
+: rt-zero
+:
+$* -c ../zero zero.lz4 &zero.lz4;
+$* -d zero.lz4 zero &zero;
+diff ../zero zero
+
+: rt-small
+:
+$* -c ../small small.lz4 &small.lz4;
+$* -d small.lz4 small &small;
+diff ../small small
+
+: rt-1kb
+:
+$* -c ../1kb 1kb.lz4 &1kb.lz4;
+$* -d 1kb.lz4 1kb &1kb;
+diff ../1kb 1kb
+
+: rt-8kb
+:
+$* -c ../8kb 8kb.lz4 &8kb.lz4;
+$* -d 8kb.lz4 8kb &8kb;
+diff ../8kb 8kb
+
+: rt-64kb
+:
+$* -c ../64kb 64kb.lz4 &64kb.lz4;
+$* -d 64kb.lz4 64kb &64kb;
+diff ../64kb 64kb
+
+: rt-512kb
+:
+$* -c ../512kb 512kb.lz4 &512kb.lz4;
+$* -d 512kb.lz4 512kb &512kb;
+diff ../512kb 512kb
+
+: truncated-header6
+:
+$* -d $src_base/truncated-header6.lz4 out &out 2>>EOE !=0
+incomplete frame header
+EOE
+
+: truncated-header12
+:
+$* -d $src_base/truncated-header12.lz4 out &out 2>>EOE !=0
+incomplete frame header
+EOE
+
+: truncated-content
+:
+$* -d $src_base/truncated-content.lz4 out &out 2>>EOE !=0
+incomplete compressed content
+EOE
diff --git a/tests/lz4/truncated-content.lz4 b/tests/lz4/truncated-content.lz4
new file mode 100644
index 0000000..2a9a39d
--- /dev/null
+++ b/tests/lz4/truncated-content.lz4
diff --git a/tests/lz4/truncated-header12.lz4 b/tests/lz4/truncated-header12.lz4
new file mode 100644
index 0000000..101088e
--- /dev/null
+++ b/tests/lz4/truncated-header12.lz4
diff --git a/tests/lz4/truncated-header6.lz4 b/tests/lz4/truncated-header6.lz4
new file mode 100644
index 0000000..a00e998
--- /dev/null
+++ b/tests/lz4/truncated-header6.lz4
@@ -0,0 +1 @@
+"Ml@
\ No newline at end of file