1 files changed, 167 insertions, 0 deletions
diff --git a/src/liblzma/common/alone_encoder.c b/src/liblzma/common/alone_encoder.c
new file mode 100644
index 00000000..7629aa77
--- /dev/null
+++ b/src/liblzma/common/alone_encoder.c
@@ -0,0 +1,167 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       alone_decoder.c
+/// \brief      Decoder for LZMA_Alone files
+//
+//  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 "common.h"
+#include "lzma_encoder.h"
+
+
+struct lzma_coder_s {
+	lzma_next_coder next;
+
+	enum {
+		SEQ_PROPERTIES,
+		SEQ_DICTIONARY_SIZE,
+		SEQ_UNCOMPRESSED_SIZE,
+		SEQ_CODE,
+	} sequence;
+
+	size_t pos;
+
+	lzma_options_alone options;
+};
+
+
+static lzma_ret
+alone_encode(lzma_coder *coder,
+		lzma_allocator *allocator lzma_attribute((unused)),
+		const uint8_t *restrict in, size_t *restrict in_pos,
+		size_t in_size, uint8_t *restrict out,
+		size_t *restrict out_pos, size_t out_size,
+		lzma_action action)
+{
+	while (*out_pos < out_size)
+	switch (coder->sequence) {
+	case SEQ_PROPERTIES:
+		if (lzma_lzma_encode_properties(
+				&coder->options.lzma, out + *out_pos)) {
+			return LZMA_PROG_ERROR;
+		}
+
+		coder->sequence = SEQ_DICTIONARY_SIZE;
+		++*out_pos;
+		break;
+
+	case SEQ_DICTIONARY_SIZE:
+		out[*out_pos] = coder->options.lzma.dictionary_size
+				>> (coder->pos * 8);
+
+		if (++coder->pos == 4) {
+			coder->pos = 0;
+			coder->sequence = SEQ_UNCOMPRESSED_SIZE;
+		}
+
+		++*out_pos;
+		break;
+
+	case SEQ_UNCOMPRESSED_SIZE:
+		out[*out_pos] = coder->options.uncompressed_size
+				>> (coder->pos * 8);
+
+		if (++coder->pos == 8) {
+			coder->pos = 0;
+			coder->sequence = SEQ_CODE;
+		}
+
+		++*out_pos;
+		break;
+
+	case SEQ_CODE: {
+		return coder->next.code(coder->next.coder,
+				allocator, in, in_pos, in_size,
+				out, out_pos, out_size, action);
+	}
+
+	default:
+		return LZMA_PROG_ERROR;
+	}
+
+	return LZMA_OK;
+}
+
+
+static void
+alone_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
+{
+	lzma_next_coder_end(&coder->next, allocator);
+	lzma_free(coder, allocator);
+	return;
+}
+
+
+// At least for now, this is not used by any internal function.
+static lzma_ret
+alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_options_alone *options)
+{
+	if (next->coder == NULL) {
+		next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
+		if (next->coder == NULL)
+			return LZMA_MEM_ERROR;
+
+		next->code = &alone_encode;
+		next->end = &alone_encoder_end;
+		next->coder->next = LZMA_NEXT_CODER_INIT;
+	}
+
+	// Initialize the LZMA_Alone coder variables.
+	next->coder->sequence = SEQ_PROPERTIES;
+	next->coder->pos = 0;
+	next->coder->options = *options;
+
+	// Verify uncompressed_size since the other functions assume that
+	// it is valid.
+	if (!lzma_vli_is_valid(next->coder->options.uncompressed_size))
+		return LZMA_PROG_ERROR;
+
+	// Initialize the LZMA encoder.
+	const lzma_filter_info filters[2] = {
+		{
+			.init = &lzma_lzma_encoder_init,
+			.options = &next->coder->options.lzma,
+			.uncompressed_size = next->coder->options
+					.uncompressed_size,
+		}, {
+			.init = NULL,
+		}
+	};
+
+	return lzma_next_filter_init(&next->coder->next, allocator, filters);
+}
+
+
+/*
+extern lzma_ret
+lzma_alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
+		const lzma_options_alone *options)
+{
+	lzma_next_coder_init(alone_encoder_init, next, allocator, options);
+}
+*/
+
+
+extern LZMA_API lzma_ret
+lzma_alone_encoder(lzma_stream *strm, const lzma_options_alone *options)
+{
+	lzma_next_strm_init(strm, alone_encoder_init, options);
+
+	strm->internal->supported_actions[LZMA_RUN] = true;
+	strm->internal->supported_actions[LZMA_FINISH] = true;
+
+	return LZMA_OK;
+}