Adding upstream version 5.6.1+really5.4.5.upstream/5.6.1+really5.4.5

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 419 insertions, 0 deletions

diff --git a/src/liblzma/delta/Makefile.inc b/src/liblzma/delta/Makefile.inc
new file mode 100644
index 0000000..c7739b4
--- /dev/null
+++ b/src/liblzma/delta/Makefile.inc
@@ -0,0 +1,23 @@
+##
+## Author: Lasse Collin
+##
+## This file has been put into the public domain.
+## You can do whatever you want with this file.
+##
+
+liblzma_la_SOURCES += \
+	delta/delta_common.c \
+	delta/delta_common.h \
+	delta/delta_private.h
+
+if COND_ENCODER_DELTA
+liblzma_la_SOURCES += \
+	delta/delta_encoder.c \
+	delta/delta_encoder.h
+endif
+
+if COND_DECODER_DELTA
+liblzma_la_SOURCES += \
+	delta/delta_decoder.c \
+	delta/delta_decoder.h
+endif
diff --git a/src/liblzma/delta/delta_common.c b/src/liblzma/delta/delta_common.c
new file mode 100644
index 0000000..4768201
--- /dev/null
+++ b/src/liblzma/delta/delta_common.c
@@ -0,0 +1,73 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       delta_common.c
+/// \brief      Common stuff for Delta encoder and decoder
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "delta_common.h"
+#include "delta_private.h"
+
+
+static void
+delta_coder_end(void *coder_ptr, const lzma_allocator *allocator)
+{
+	lzma_delta_coder *coder = coder_ptr;
+	lzma_next_end(&coder->next, allocator);
+	lzma_free(coder, allocator);
+	return;
+}
+
+
+extern lzma_ret
+lzma_delta_coder_init(lzma_next_coder *next, const lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	// Allocate memory for the decoder if needed.
+	lzma_delta_coder *coder = next->coder;
+	if (coder == NULL) {
+		coder = lzma_alloc(sizeof(lzma_delta_coder), allocator);
+		if (coder == NULL)
+			return LZMA_MEM_ERROR;
+
+		next->coder = coder;
+
+		// End function is the same for encoder and decoder.
+		next->end = &delta_coder_end;
+		coder->next = LZMA_NEXT_CODER_INIT;
+	}
+
+	// Validate the options.
+	if (lzma_delta_coder_memusage(filters[0].options) == UINT64_MAX)
+		return LZMA_OPTIONS_ERROR;
+
+	// Set the delta distance.
+	const lzma_options_delta *opt = filters[0].options;
+	coder->distance = opt->dist;
+
+	// Initialize the rest of the variables.
+	coder->pos = 0;
+	memzero(coder->history, LZMA_DELTA_DIST_MAX);
+
+	// Initialize the next decoder in the chain, if any.
+	return lzma_next_filter_init(&coder->next, allocator, filters + 1);
+}
+
+
+extern uint64_t
+lzma_delta_coder_memusage(const void *options)
+{
+	const lzma_options_delta *opt = options;
+
+	if (opt == NULL || opt->type != LZMA_DELTA_TYPE_BYTE
+			|| opt->dist < LZMA_DELTA_DIST_MIN
+			|| opt->dist > LZMA_DELTA_DIST_MAX)
+		return UINT64_MAX;
+
+	return sizeof(lzma_delta_coder);
+}
diff --git a/src/liblzma/delta/delta_common.h b/src/liblzma/delta/delta_common.h
new file mode 100644
index 0000000..7e7e1ba
--- /dev/null
+++ b/src/liblzma/delta/delta_common.h
@@ -0,0 +1,20 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       delta_common.h
+/// \brief      Common stuff for Delta encoder and decoder
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_DELTA_COMMON_H
+#define LZMA_DELTA_COMMON_H
+
+#include "common.h"
+
+extern uint64_t lzma_delta_coder_memusage(const void *options);
+
+#endif
diff --git a/src/liblzma/delta/delta_decoder.c b/src/liblzma/delta/delta_decoder.c
new file mode 100644
index 0000000..77cf65c
--- /dev/null
+++ b/src/liblzma/delta/delta_decoder.c
@@ -0,0 +1,83 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       delta_decoder.c
+/// \brief      Delta filter decoder
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "delta_decoder.h"
+#include "delta_private.h"
+
+
+static void
+decode_buffer(lzma_delta_coder *coder, uint8_t *buffer, size_t size)
+{
+	const size_t distance = coder->distance;
+
+	for (size_t i = 0; i < size; ++i) {
+		buffer[i] += coder->history[(distance + coder->pos) & 0xFF];
+		coder->history[coder->pos-- & 0xFF] = buffer[i];
+	}
+}
+
+
+static lzma_ret
+delta_decode(void *coder_ptr, const lzma_allocator *allocator,
+		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)
+{
+	lzma_delta_coder *coder = coder_ptr;
+
+	assert(coder->next.code != NULL);
+
+	const size_t out_start = *out_pos;
+
+	const lzma_ret ret = coder->next.code(coder->next.coder, allocator,
+			in, in_pos, in_size, out, out_pos, out_size,
+			action);
+
+	// out might be NULL. In that case size == 0. Null pointer + 0 is
+	// undefined behavior so skip the call in that case as it would
+	// do nothing anyway.
+	const size_t size = *out_pos - out_start;
+	if (size > 0)
+		decode_buffer(coder, out + out_start, size);
+
+	return ret;
+}
+
+
+extern lzma_ret
+lzma_delta_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	next->code = &delta_decode;
+	return lzma_delta_coder_init(next, allocator, filters);
+}
+
+
+extern lzma_ret
+lzma_delta_props_decode(void **options, const lzma_allocator *allocator,
+		const uint8_t *props, size_t props_size)
+{
+	if (props_size != 1)
+		return LZMA_OPTIONS_ERROR;
+
+	lzma_options_delta *opt
+			= lzma_alloc(sizeof(lzma_options_delta), allocator);
+	if (opt == NULL)
+		return LZMA_MEM_ERROR;
+
+	opt->type = LZMA_DELTA_TYPE_BYTE;
+	opt->dist = props[0] + 1U;
+
+	*options = opt;
+
+	return LZMA_OK;
+}
diff --git a/src/liblzma/delta/delta_decoder.h b/src/liblzma/delta/delta_decoder.h
new file mode 100644
index 0000000..ad89cc6
--- /dev/null
+++ b/src/liblzma/delta/delta_decoder.h
@@ -0,0 +1,26 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       delta_decoder.h
+/// \brief      Delta filter decoder
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_DELTA_DECODER_H
+#define LZMA_DELTA_DECODER_H
+
+#include "delta_common.h"
+
+extern lzma_ret lzma_delta_decoder_init(lzma_next_coder *next,
+		const lzma_allocator *allocator,
+		const lzma_filter_info *filters);
+
+extern lzma_ret lzma_delta_props_decode(
+		void **options, const lzma_allocator *allocator,
+		const uint8_t *props, size_t props_size);
+
+#endif
diff --git a/src/liblzma/delta/delta_encoder.c b/src/liblzma/delta/delta_encoder.c
new file mode 100644
index 0000000..056bf74
--- /dev/null
+++ b/src/liblzma/delta/delta_encoder.c
@@ -0,0 +1,133 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       delta_encoder.c
+/// \brief      Delta filter encoder
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "delta_encoder.h"
+#include "delta_private.h"
+
+
+/// Copies and encodes the data at the same time. This is used when Delta
+/// is the first filter in the chain (and thus the last filter in the
+/// encoder's filter stack).
+static void
+copy_and_encode(lzma_delta_coder *coder,
+		const uint8_t *restrict in, uint8_t *restrict out, size_t size)
+{
+	const size_t distance = coder->distance;
+
+	for (size_t i = 0; i < size; ++i) {
+		const uint8_t tmp = coder->history[
+				(distance + coder->pos) & 0xFF];
+		coder->history[coder->pos-- & 0xFF] = in[i];
+		out[i] = in[i] - tmp;
+	}
+}
+
+
+/// Encodes the data in place. This is used when we are the last filter
+/// in the chain (and thus non-last filter in the encoder's filter stack).
+static void
+encode_in_place(lzma_delta_coder *coder, uint8_t *buffer, size_t size)
+{
+	const size_t distance = coder->distance;
+
+	for (size_t i = 0; i < size; ++i) {
+		const uint8_t tmp = coder->history[
+				(distance + coder->pos) & 0xFF];
+		coder->history[coder->pos-- & 0xFF] = buffer[i];
+		buffer[i] -= tmp;
+	}
+}
+
+
+static lzma_ret
+delta_encode(void *coder_ptr, const lzma_allocator *allocator,
+		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)
+{
+	lzma_delta_coder *coder = coder_ptr;
+
+	lzma_ret ret;
+
+	if (coder->next.code == NULL) {
+		const size_t in_avail = in_size - *in_pos;
+		const size_t out_avail = out_size - *out_pos;
+		const size_t size = my_min(in_avail, out_avail);
+
+		// in and out might be NULL. In such cases size == 0.
+		// Null pointer + 0 is undefined behavior so skip
+		// the call in that case as it would do nothing anyway.
+		if (size > 0)
+			copy_and_encode(coder, in + *in_pos, out + *out_pos,
+					size);
+
+		*in_pos += size;
+		*out_pos += size;
+
+		ret = action != LZMA_RUN && *in_pos == in_size
+				? LZMA_STREAM_END : LZMA_OK;
+
+	} else {
+		const size_t out_start = *out_pos;
+
+		ret = coder->next.code(coder->next.coder, allocator,
+				in, in_pos, in_size, out, out_pos, out_size,
+				action);
+
+		// Like above, avoid null pointer + 0.
+		const size_t size = *out_pos - out_start;
+		if (size > 0)
+			encode_in_place(coder, out + out_start, size);
+	}
+
+	return ret;
+}
+
+
+static lzma_ret
+delta_encoder_update(void *coder_ptr, const lzma_allocator *allocator,
+		const lzma_filter *filters_null lzma_attribute((__unused__)),
+		const lzma_filter *reversed_filters)
+{
+	lzma_delta_coder *coder = coder_ptr;
+
+	// Delta doesn't and will never support changing the options in
+	// the middle of encoding. If the app tries to change them, we
+	// simply ignore them.
+	return lzma_next_filter_update(
+			&coder->next, allocator, reversed_filters + 1);
+}
+
+
+extern lzma_ret
+lzma_delta_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
+		const lzma_filter_info *filters)
+{
+	next->code = &delta_encode;
+	next->update = &delta_encoder_update;
+	return lzma_delta_coder_init(next, allocator, filters);
+}
+
+
+extern lzma_ret
+lzma_delta_props_encode(const void *options, uint8_t *out)
+{
+	// The caller must have already validated the options, so it's
+	// LZMA_PROG_ERROR if they are invalid.
+	if (lzma_delta_coder_memusage(options) == UINT64_MAX)
+		return LZMA_PROG_ERROR;
+
+	const lzma_options_delta *opt = options;
+	out[0] = opt->dist - LZMA_DELTA_DIST_MIN;
+
+	return LZMA_OK;
+}
diff --git a/src/liblzma/delta/delta_encoder.h b/src/liblzma/delta/delta_encoder.h
new file mode 100644
index 0000000..4ab9847
--- /dev/null
+++ b/src/liblzma/delta/delta_encoder.h
@@ -0,0 +1,24 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       delta_encoder.h
+/// \brief      Delta filter encoder
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_DELTA_ENCODER_H
+#define LZMA_DELTA_ENCODER_H
+
+#include "delta_common.h"
+
+extern lzma_ret lzma_delta_encoder_init(lzma_next_coder *next,
+		const lzma_allocator *allocator,
+		const lzma_filter_info *filters);
+
+extern lzma_ret lzma_delta_props_encode(const void *options, uint8_t *out);
+
+#endif
diff --git a/src/liblzma/delta/delta_private.h b/src/liblzma/delta/delta_private.h
new file mode 100644
index 0000000..0d6cb38
--- /dev/null
+++ b/src/liblzma/delta/delta_private.h
@@ -0,0 +1,37 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       delta_private.h
+/// \brief      Private common stuff for Delta encoder and decoder
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_DELTA_PRIVATE_H
+#define LZMA_DELTA_PRIVATE_H
+
+#include "delta_common.h"
+
+typedef struct {
+	/// Next coder in the chain
+	lzma_next_coder next;
+
+	/// Delta distance
+	size_t distance;
+
+	/// Position in history[]
+	uint8_t pos;
+
+	/// Buffer to hold history of the original data
+	uint8_t history[LZMA_DELTA_DIST_MAX];
+} lzma_delta_coder;
+
+
+extern lzma_ret lzma_delta_coder_init(
+		lzma_next_coder *next, const lzma_allocator *allocator,
+		const lzma_filter_info *filters);
+
+#endif