Merge compression updates

[wimlib] / src / lz_null.c

diff --git a/src/lz_null.c b/src/lz_null.c
new file mode 100644 (file)
index 0000000..474ab13
--- /dev/null
+++ b/src/lz_null.c
@@ -0,0 +1,94 @@
+/*
+ * lz_null.c
+ *
+ * Dummy "match-finder" for Lempel-Ziv compression.
+ *
+ * Copyright (c) 2014 Eric Biggers.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include "wimlib/lz_mf.h"
+
+static bool
+lz_null_params_valid(const struct lz_mf_params *_params)
+{
+       return true;
+}
+
+static u64
+lz_null_get_needed_memory(u32 max_window_size)
+{
+       return 0;
+}
+
+static bool
+lz_null_init(struct lz_mf *mf)
+{
+       if (mf->params.min_match_len == 0)
+               mf->params.min_match_len = 2;
+
+       if (mf->params.max_match_len == 0)
+               mf->params.max_match_len = mf->params.max_window_size;
+
+       return true;
+}
+
+static void
+lz_null_load_window(struct lz_mf *mf, const u8 window[], u32 size)
+{
+}
+
+static u32
+lz_null_get_matches(struct lz_mf *mf, struct lz_match matches[])
+{
+       mf->cur_window_pos++;
+       return 0;
+}
+
+static void
+lz_null_skip_positions(struct lz_mf *mf, u32 n)
+{
+       mf->cur_window_pos += n;
+}
+
+static void
+lz_null_destroy(struct lz_mf *mf)
+{
+}
+
+const struct lz_mf_ops lz_null_ops = {
+       .params_valid      = lz_null_params_valid,
+       .get_needed_memory = lz_null_get_needed_memory,
+       .init              = lz_null_init,
+       .load_window       = lz_null_load_window,
+       .get_matches       = lz_null_get_matches,
+       .skip_positions    = lz_null_skip_positions,
+       .destroy           = lz_null_destroy,
+       .struct_size       = sizeof(struct lz_mf),
+};