Added lzma_easy_* functions. These should make using

liblzma as easy as using zlib, because the easy API
don't require developers to know any fancy LZMA options.

Note that Multi-Block Stream encoding is currently broken.
The easy API should be OK, the bug(s) are elsewhere.

1 files changed, 54 insertions, 0 deletions

diff --git a/src/liblzma/common/easy_common.c b/src/liblzma/common/easy_common.c
new file mode 100644
index 00000000..e0c12a52
--- /dev/null
+++ b/src/liblzma/common/easy_common.c
@@ -0,0 +1,54 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       easy_common.c
+/// \brief      Shared stuff for easy encoder initialization functions
+//
+//  Copyright (C) 2008 Lasse Collin
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2.1 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "easy_common.h"
+
+
+extern bool
+lzma_easy_set_filters(lzma_options_filter *filters, uint32_t level)
+{
+	bool error = false;
+
+	if (level == 0) {
+		filters[0].id = LZMA_VLI_VALUE_UNKNOWN;
+
+#ifdef HAVE_FILTER_LZMA
+	} else if (level <= 9) {
+		filters[0].id = LZMA_FILTER_LZMA;
+		filters[0].options = (void *)(&lzma_preset_lzma[level - 1]);
+		filters[1].id = LZMA_VLI_VALUE_UNKNOWN;
+#endif
+
+	} else {
+		error = true;
+	}
+
+	return error;
+}
+
+
+extern LZMA_API uint32_t
+lzma_easy_memory_usage(lzma_easy_level level)
+{
+	lzma_options_filter filters[8];
+	if (lzma_easy_set_filters(filters, level))
+		return UINT32_MAX;
+
+	return lzma_memory_usage(filters, true);
+}