Imported to git.

1 files changed, 74 insertions, 0 deletions

diff --git a/src/liblzma/lzma/lzma_literal.c b/src/liblzma/lzma/lzma_literal.c
new file mode 100644
index 00000000..8f650fbf
--- /dev/null
+++ b/src/liblzma/lzma/lzma_literal.c
@@ -0,0 +1,74 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       lzma_literal.c
+/// \brief      Literal Coder
+//
+//  Copyright (C) 1999-2006 Igor Pavlov
+//  Copyright (C) 2007 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 "lzma_literal.h"
+
+
+extern lzma_ret
+lzma_literal_init(lzma_literal_coder **coder, lzma_allocator *allocator,
+		uint32_t literal_context_bits, uint32_t literal_pos_bits)
+{
+	// Verify that arguments are sane.
+	if (literal_context_bits > LZMA_LITERAL_CONTEXT_BITS_MAX
+			|| literal_pos_bits > LZMA_LITERAL_POS_BITS_MAX)
+		return LZMA_HEADER_ERROR;
+
+	// Calculate the number of states the literal coder must store.
+	const uint32_t states = literal_states(
+			literal_pos_bits, literal_context_bits);
+
+	// Allocate a new literal coder, if needed.
+	if (*coder == NULL || (**coder).literal_context_bits
+				!= literal_context_bits
+			|| (**coder).literal_pos_bits != literal_pos_bits) {
+		// Free the old coder, if any.
+		lzma_free(*coder, allocator);
+
+		// Allocate a new one.
+		*coder = lzma_alloc(sizeof(lzma_literal_coder)
+				+ states * LIT_SIZE * sizeof(probability),
+				allocator);
+		if (*coder == NULL)
+			return LZMA_MEM_ERROR;
+
+		// Store the new settings.
+		(**coder).literal_context_bits = literal_context_bits;
+		(**coder).literal_pos_bits = literal_pos_bits;
+
+		// Calculate also the literal_pos_mask. It's not changed
+		// anywhere else than here.
+		(**coder).literal_pos_mask = (1 << literal_pos_bits) - 1;
+	}
+
+	// Reset the literal coder.
+	for (uint32_t i = 0; i < states; ++i)
+		for (uint32_t j = 0; j < LIT_SIZE; ++j)
+			bit_reset((**coder).coders[i][j]);
+
+	return LZMA_OK;
+}
+
+
+extern void
+lzma_literal_end(lzma_literal_coder **coder, lzma_allocator *allocator)
+{
+	lzma_free(*coder, allocator);
+	*coder = NULL;
+}