Merging upstream version 5.6.2.

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

65 files changed, 269 insertions, 242 deletions

diff --git a/src/liblzma/common/Makefile.inc b/src/liblzma/common/Makefile.inc
index f0276a2..51b1aae 100644
--- a/src/liblzma/common/Makefile.inc
+++ b/src/liblzma/common/Makefile.inc
@@ -1,9 +1,5 @@
-##
+## SPDX-License-Identifier: 0BSD
 ## Author: Lasse Collin
-##
-## This file has been put into the public domain.
-## You can do whatever you want with this file.
-##
 
 liblzma_la_SOURCES += \
 	common/common.c \
diff --git a/src/liblzma/common/alone_decoder.c b/src/liblzma/common/alone_decoder.c
index 1dc85ba..78af651 100644
--- a/src/liblzma/common/alone_decoder.c
+++ b/src/liblzma/common/alone_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       alone_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "alone_decoder.h"
diff --git a/src/liblzma/common/alone_decoder.h b/src/liblzma/common/alone_decoder.h
index dfa031a..61ee24d 100644
--- a/src/liblzma/common/alone_decoder.h
+++ b/src/liblzma/common/alone_decoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       alone_decoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_ALONE_DECODER_H
diff --git a/src/liblzma/common/alone_encoder.c b/src/liblzma/common/alone_encoder.c
index 7d3812f..21b0395 100644
--- a/src/liblzma/common/alone_encoder.c
+++ b/src/liblzma/common/alone_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       alone_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/auto_decoder.c b/src/liblzma/common/auto_decoder.c
index 2a5c089..fdd520f 100644
--- a/src/liblzma/common/auto_decoder.c
+++ b/src/liblzma/common/auto_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       auto_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "stream_decoder.h"
diff --git a/src/liblzma/common/block_buffer_decoder.c b/src/liblzma/common/block_buffer_decoder.c
index b0ded90..55566cd 100644
--- a/src/liblzma/common/block_buffer_decoder.c
+++ b/src/liblzma/common/block_buffer_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_buffer_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "block_decoder.h"
diff --git a/src/liblzma/common/block_buffer_encoder.c b/src/liblzma/common/block_buffer_encoder.c
index fdef02d..df3b90e 100644
--- a/src/liblzma/common/block_buffer_encoder.c
+++ b/src/liblzma/common/block_buffer_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_buffer_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "block_buffer_encoder.h"
diff --git a/src/liblzma/common/block_buffer_encoder.h b/src/liblzma/common/block_buffer_encoder.h
index 653207f..5274ac4 100644
--- a/src/liblzma/common/block_buffer_encoder.h
+++ b/src/liblzma/common/block_buffer_encoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_buffer_encoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_BLOCK_BUFFER_ENCODER_H
diff --git a/src/liblzma/common/block_decoder.c b/src/liblzma/common/block_decoder.c
index be647d4..2e369d3 100644
--- a/src/liblzma/common/block_decoder.c
+++ b/src/liblzma/common/block_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "block_decoder.h"
diff --git a/src/liblzma/common/block_decoder.h b/src/liblzma/common/block_decoder.h
index 718c5ce..2cbf9ba 100644
--- a/src/liblzma/common/block_decoder.h
+++ b/src/liblzma/common/block_decoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_decoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_BLOCK_DECODER_H
diff --git a/src/liblzma/common/block_encoder.c b/src/liblzma/common/block_encoder.c
index 4a136ef..ce8c1de 100644
--- a/src/liblzma/common/block_encoder.c
+++ b/src/liblzma/common/block_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "block_encoder.h"
diff --git a/src/liblzma/common/block_encoder.h b/src/liblzma/common/block_encoder.h
index bd97c18..b7dfe9a 100644
--- a/src/liblzma/common/block_encoder.h
+++ b/src/liblzma/common/block_encoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_encoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_BLOCK_ENCODER_H
diff --git a/src/liblzma/common/block_header_decoder.c b/src/liblzma/common/block_header_decoder.c
index c4935dc..f0b2fbe 100644
--- a/src/liblzma/common/block_header_decoder.c
+++ b/src/liblzma/common/block_header_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_header_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/block_header_encoder.c b/src/liblzma/common/block_header_encoder.c
index 160425d..45e57a2 100644
--- a/src/liblzma/common/block_header_encoder.c
+++ b/src/liblzma/common/block_header_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_header_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/block_util.c b/src/liblzma/common/block_util.c
index acb3111..191f6d4 100644
--- a/src/liblzma/common/block_util.c
+++ b/src/liblzma/common/block_util.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       block_util.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/common.c b/src/liblzma/common/common.c
index adb50d7..cc0e06a 100644
--- a/src/liblzma/common/common.c
+++ b/src/liblzma/common/common.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       common.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/common.h b/src/liblzma/common/common.h
index 378923e..20af32f 100644
--- a/src/liblzma/common/common.h
+++ b/src/liblzma/common/common.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       common.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_COMMON_H
diff --git a/src/liblzma/common/easy_buffer_encoder.c b/src/liblzma/common/easy_buffer_encoder.c
index 48eb56f..da610ce 100644
--- a/src/liblzma/common/easy_buffer_encoder.c
+++ b/src/liblzma/common/easy_buffer_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       easy_buffer_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "easy_preset.h"
diff --git a/src/liblzma/common/easy_decoder_memusage.c b/src/liblzma/common/easy_decoder_memusage.c
index 20bcd5b..0c76f10 100644
--- a/src/liblzma/common/easy_decoder_memusage.c
+++ b/src/liblzma/common/easy_decoder_memusage.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       easy_decoder_memusage.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "easy_preset.h"
diff --git a/src/liblzma/common/easy_encoder.c b/src/liblzma/common/easy_encoder.c
index 5cb492d..8dfe296 100644
--- a/src/liblzma/common/easy_encoder.c
+++ b/src/liblzma/common/easy_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       easy_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "easy_preset.h"
diff --git a/src/liblzma/common/easy_encoder_memusage.c b/src/liblzma/common/easy_encoder_memusage.c
index e910575..1184ac6 100644
--- a/src/liblzma/common/easy_encoder_memusage.c
+++ b/src/liblzma/common/easy_encoder_memusage.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       easy_encoder_memusage.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "easy_preset.h"
diff --git a/src/liblzma/common/easy_preset.c b/src/liblzma/common/easy_preset.c
index 2f98598..7908a2b 100644
--- a/src/liblzma/common/easy_preset.c
+++ b/src/liblzma/common/easy_preset.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       easy_preset.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "easy_preset.h"
diff --git a/src/liblzma/common/easy_preset.h b/src/liblzma/common/easy_preset.h
index 382ade8..4ef6d04 100644
--- a/src/liblzma/common/easy_preset.h
+++ b/src/liblzma/common/easy_preset.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       easy_preset.h
@@ -5,11 +7,11 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
+#ifndef LZMA_EASY_PRESET_H
+#define LZMA_EASY_PRESET_H
+
 #include "common.h"
 
 
@@ -30,3 +32,5 @@ typedef struct {
 /// Set *easy to the settings given by the preset. Returns true on error,
 /// false on success.
 extern bool lzma_easy_preset(lzma_options_easy *easy, uint32_t preset);
+
+#endif
diff --git a/src/liblzma/common/file_info.c b/src/liblzma/common/file_info.c
index 799bb02..7c85084 100644
--- a/src/liblzma/common/file_info.c
+++ b/src/liblzma/common/file_info.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       file_info.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "index_decoder.h"
diff --git a/src/liblzma/common/filter_buffer_decoder.c b/src/liblzma/common/filter_buffer_decoder.c
index 6620986..cc0d88c 100644
--- a/src/liblzma/common/filter_buffer_decoder.c
+++ b/src/liblzma/common/filter_buffer_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_buffer_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_decoder.h"
@@ -24,7 +23,7 @@ lzma_raw_buffer_decode(
 			|| out_pos == NULL || *out_pos > out_size)
 		return LZMA_PROG_ERROR;
 
-	// Initialize the decoer.
+	// Initialize the decoder.
 	lzma_next_coder next = LZMA_NEXT_CODER_INIT;
 	return_if_error(lzma_raw_decoder_init(&next, allocator, filters));
 
diff --git a/src/liblzma/common/filter_buffer_encoder.c b/src/liblzma/common/filter_buffer_encoder.c
index dda18e3..7fb8922 100644
--- a/src/liblzma/common/filter_buffer_encoder.c
+++ b/src/liblzma/common/filter_buffer_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_buffer_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_encoder.h"
diff --git a/src/liblzma/common/filter_common.c b/src/liblzma/common/filter_common.c
index fa0927c..d15d9cc 100644
--- a/src/liblzma/common/filter_common.c
+++ b/src/liblzma/common/filter_common.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_common.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_common.h"
@@ -122,6 +121,15 @@ static const struct {
 		.changes_size = false,
 	},
 #endif
+#if defined(HAVE_ENCODER_RISCV) || defined(HAVE_DECODER_RISCV)
+	{
+		.id = LZMA_FILTER_RISCV,
+		.options_size = sizeof(lzma_options_bcj),
+		.non_last_ok = true,
+		.last_ok = false,
+		.changes_size = false,
+	},
+#endif
 #if defined(HAVE_ENCODER_DELTA) || defined(HAVE_DECODER_DELTA)
 	{
 		.id = LZMA_FILTER_DELTA,
@@ -145,7 +153,7 @@ lzma_filters_copy(const lzma_filter *src, lzma_filter *real_dest,
 		return LZMA_PROG_ERROR;
 
 	// Use a temporary destination so that the real destination
-	// will never be modied if an error occurs.
+	// will never be modified if an error occurs.
 	lzma_filter dest[LZMA_FILTERS_MAX + 1];
 
 	lzma_ret ret;
diff --git a/src/liblzma/common/filter_common.h b/src/liblzma/common/filter_common.h
index 2e47bb6..95f9fe2 100644
--- a/src/liblzma/common/filter_common.h
+++ b/src/liblzma/common/filter_common.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_common.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_FILTER_COMMON_H
diff --git a/src/liblzma/common/filter_decoder.c b/src/liblzma/common/filter_decoder.c
index fa53f5b..cbdeb58 100644
--- a/src/liblzma/common/filter_decoder.c
+++ b/src/liblzma/common/filter_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_decoder.h"
@@ -121,6 +120,14 @@ static const lzma_filter_decoder decoders[] = {
 		.props_decode = &lzma_simple_props_decode,
 	},
 #endif
+#ifdef HAVE_DECODER_RISCV
+	{
+		.id = LZMA_FILTER_RISCV,
+		.init = &lzma_simple_riscv_decoder_init,
+		.memusage = NULL,
+		.props_decode = &lzma_simple_props_decode,
+	},
+#endif
 #ifdef HAVE_DECODER_DELTA
 	{
 		.id = LZMA_FILTER_DELTA,
@@ -143,6 +150,16 @@ decoder_find(lzma_vli id)
 }
 
 
+// lzma_filter_coder begins with the same members as lzma_filter_decoder.
+// This function is a wrapper with a type that is compatible with the
+// typedef of lzma_filter_find in filter_common.h.
+static const lzma_filter_coder *
+coder_find(lzma_vli id)
+{
+	return (const lzma_filter_coder *)decoder_find(id);
+}
+
+
 extern LZMA_API(lzma_bool)
 lzma_filter_decoder_is_supported(lzma_vli id)
 {
@@ -155,7 +172,7 @@ lzma_raw_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
 		const lzma_filter *options)
 {
 	return lzma_raw_coder_init(next, allocator,
-			options, (lzma_filter_find)(&decoder_find), false);
+			options, &coder_find, false);
 }
 
 
@@ -174,8 +191,7 @@ lzma_raw_decoder(lzma_stream *strm, const lzma_filter *options)
 extern LZMA_API(uint64_t)
 lzma_raw_decoder_memusage(const lzma_filter *filters)
 {
-	return lzma_raw_coder_memusage(
-			(lzma_filter_find)(&decoder_find), filters);
+	return lzma_raw_coder_memusage(&coder_find, filters);
 }
 
 
diff --git a/src/liblzma/common/filter_decoder.h b/src/liblzma/common/filter_decoder.h
index 2dac602..e610bc1 100644
--- a/src/liblzma/common/filter_decoder.h
+++ b/src/liblzma/common/filter_decoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_decoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_FILTER_DECODER_H
diff --git a/src/liblzma/common/filter_encoder.c b/src/liblzma/common/filter_encoder.c
index 46fe8af..bc39444 100644
--- a/src/liblzma/common/filter_encoder.c
+++ b/src/liblzma/common/filter_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_encoder.h"
@@ -33,7 +32,8 @@ typedef struct {
 	/// Calculates the recommended Uncompressed Size for .xz Blocks to
 	/// which the input data can be split to make multithreaded
 	/// encoding possible. If this is NULL, it is assumed that
-	/// the encoder is fast enough with single thread.
+	/// the encoder is fast enough with single thread. If the options
+	/// are invalid, UINT64_MAX is returned.
 	uint64_t (*block_size)(const void *options);
 
 	/// Tells the size of the Filter Properties field. If options are
@@ -158,6 +158,16 @@ static const lzma_filter_encoder encoders[] = {
 		.props_encode = &lzma_simple_props_encode,
 	},
 #endif
+#ifdef HAVE_ENCODER_RISCV
+	{
+		.id = LZMA_FILTER_RISCV,
+		.init = &lzma_simple_riscv_encoder_init,
+		.memusage = NULL,
+		.block_size = NULL,
+		.props_size_get = &lzma_simple_props_size,
+		.props_encode = &lzma_simple_props_encode,
+	},
+#endif
 #ifdef HAVE_ENCODER_DELTA
 	{
 		.id = LZMA_FILTER_DELTA,
@@ -183,6 +193,16 @@ encoder_find(lzma_vli id)
 }
 
 
+// lzma_filter_coder begins with the same members as lzma_filter_encoder.
+// This function is a wrapper with a type that is compatible with the
+// typedef of lzma_filter_find in filter_common.h.
+static const lzma_filter_coder *
+coder_find(lzma_vli id)
+{
+	return (const lzma_filter_coder *)encoder_find(id);
+}
+
+
 extern LZMA_API(lzma_bool)
 lzma_filter_encoder_is_supported(lzma_vli id)
 {
@@ -219,18 +239,18 @@ lzma_filters_update(lzma_stream *strm, const lzma_filter *filters)
 
 extern lzma_ret
 lzma_raw_encoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
-		const lzma_filter *options)
+		const lzma_filter *filters)
 {
 	return lzma_raw_coder_init(next, allocator,
-			options, (lzma_filter_find)(&encoder_find), true);
+			filters, &coder_find, true);
 }
 
 
 extern LZMA_API(lzma_ret)
-lzma_raw_encoder(lzma_stream *strm, const lzma_filter *options)
+lzma_raw_encoder(lzma_stream *strm, const lzma_filter *filters)
 {
-	lzma_next_strm_init(lzma_raw_coder_init, strm, options,
-			(lzma_filter_find)(&encoder_find), true);
+	lzma_next_strm_init(lzma_raw_coder_init, strm, filters,
+			&coder_find, true);
 
 	strm->internal->supported_actions[LZMA_RUN] = true;
 	strm->internal->supported_actions[LZMA_SYNC_FLUSH] = true;
@@ -243,31 +263,33 @@ lzma_raw_encoder(lzma_stream *strm, const lzma_filter *options)
 extern LZMA_API(uint64_t)
 lzma_raw_encoder_memusage(const lzma_filter *filters)
 {
-	return lzma_raw_coder_memusage(
-			(lzma_filter_find)(&encoder_find), filters);
+	return lzma_raw_coder_memusage(&coder_find, filters);
 }
 
 
-extern uint64_t
+extern LZMA_API(uint64_t)
 lzma_mt_block_size(const lzma_filter *filters)
 {
+	if (filters == NULL)
+		return UINT64_MAX;
+
 	uint64_t max = 0;
 
 	for (size_t i = 0; filters[i].id != LZMA_VLI_UNKNOWN; ++i) {
 		const lzma_filter_encoder *const fe
 				= encoder_find(filters[i].id);
+		if (fe == NULL)
+			return UINT64_MAX;
+
 		if (fe->block_size != NULL) {
 			const uint64_t size
 					= fe->block_size(filters[i].options);
-			if (size == 0)
-				return 0;
-
 			if (size > max)
 				max = size;
 		}
 	}
 
-	return max;
+	return max == 0 ? UINT64_MAX : max;
 }
 
 
diff --git a/src/liblzma/common/filter_encoder.h b/src/liblzma/common/filter_encoder.h
index f1d5683..88f2daf 100644
--- a/src/liblzma/common/filter_encoder.h
+++ b/src/liblzma/common/filter_encoder.h
@@ -1,13 +1,12 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
-/// \file       filter_encoder.c
+/// \file       filter_encoder.h
 /// \brief      Filter ID mapping to filter-specific functions
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_FILTER_ENCODER_H
@@ -16,10 +15,6 @@
 #include "common.h"
 
 
-// FIXME: Might become a part of the public API.
-extern uint64_t lzma_mt_block_size(const lzma_filter *filters);
-
-
 extern lzma_ret lzma_raw_encoder_init(
 		lzma_next_coder *next, const lzma_allocator *allocator,
 		const lzma_filter *filters);
diff --git a/src/liblzma/common/filter_flags_decoder.c b/src/liblzma/common/filter_flags_decoder.c
index ddfb085..0f5d204 100644
--- a/src/liblzma/common/filter_flags_decoder.c
+++ b/src/liblzma/common/filter_flags_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_flags_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_decoder.h"
diff --git a/src/liblzma/common/filter_flags_encoder.c b/src/liblzma/common/filter_flags_encoder.c
index b57b9fd..e1d6588 100644
--- a/src/liblzma/common/filter_flags_encoder.c
+++ b/src/liblzma/common/filter_flags_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       filter_flags_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_encoder.h"
diff --git a/src/liblzma/common/hardware_cputhreads.c b/src/liblzma/common/hardware_cputhreads.c
index 5d246d2..4ce852b 100644
--- a/src/liblzma/common/hardware_cputhreads.c
+++ b/src/liblzma/common/hardware_cputhreads.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       hardware_cputhreads.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/hardware_physmem.c b/src/liblzma/common/hardware_physmem.c
index a2bbbe2..1bc3486 100644
--- a/src/liblzma/common/hardware_physmem.c
+++ b/src/liblzma/common/hardware_physmem.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       hardware_physmem.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Jonathan Nieder
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/index.c b/src/liblzma/common/index.c
index 8a35f43..6add6a6 100644
--- a/src/liblzma/common/index.c
+++ b/src/liblzma/common/index.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       index.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/index.h b/src/liblzma/common/index.h
index 7b27d70..007e118 100644
--- a/src/liblzma/common/index.h
+++ b/src/liblzma/common/index.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       index.h
@@ -12,9 +14,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_INDEX_H
diff --git a/src/liblzma/common/index_decoder.c b/src/liblzma/common/index_decoder.c
index 19a31b3..4bcb306 100644
--- a/src/liblzma/common/index_decoder.c
+++ b/src/liblzma/common/index_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       index_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "index_decoder.h"
@@ -306,6 +305,12 @@ lzma_index_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
 extern LZMA_API(lzma_ret)
 lzma_index_decoder(lzma_stream *strm, lzma_index **i, uint64_t memlimit)
 {
+	// If i isn't NULL, *i must always be initialized due to
+	// the wording in the API docs. This way it is initialized
+	// if we return LZMA_PROG_ERROR due to strm == NULL.
+	if (i != NULL)
+		*i = NULL;
+
 	lzma_next_strm_init(lzma_index_decoder_init, strm, i, memlimit);
 
 	strm->internal->supported_actions[LZMA_RUN] = true;
@@ -320,6 +325,11 @@ lzma_index_buffer_decode(lzma_index **i, uint64_t *memlimit,
 		const lzma_allocator *allocator,
 		const uint8_t *in, size_t *in_pos, size_t in_size)
 {
+	// If i isn't NULL, *i must always be initialized due to
+	// the wording in the API docs.
+	if (i != NULL)
+		*i = NULL;
+
 	// Sanity checks
 	if (i == NULL || memlimit == NULL
 			|| in == NULL || in_pos == NULL || *in_pos > in_size)
diff --git a/src/liblzma/common/index_decoder.h b/src/liblzma/common/index_decoder.h
index 3fec483..5351d2f 100644
--- a/src/liblzma/common/index_decoder.h
+++ b/src/liblzma/common/index_decoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       index_decoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_INDEX_DECODER_H
diff --git a/src/liblzma/common/index_encoder.c b/src/liblzma/common/index_encoder.c
index 204490c..ecc299c 100644
--- a/src/liblzma/common/index_encoder.c
+++ b/src/liblzma/common/index_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       index_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "index_encoder.h"
diff --git a/src/liblzma/common/index_encoder.h b/src/liblzma/common/index_encoder.h
index 4d55cd1..29ba110 100644
--- a/src/liblzma/common/index_encoder.h
+++ b/src/liblzma/common/index_encoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       index_encoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_INDEX_ENCODER_H
diff --git a/src/liblzma/common/index_hash.c b/src/liblzma/common/index_hash.c
index 52c3d65..caa5967 100644
--- a/src/liblzma/common/index_hash.c
+++ b/src/liblzma/common/index_hash.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       index_hash.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/lzip_decoder.c b/src/liblzma/common/lzip_decoder.c
index 88cc7ff..651a0ae 100644
--- a/src/liblzma/common/lzip_decoder.c
+++ b/src/liblzma/common/lzip_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       lzip_decoder.c
@@ -6,9 +8,6 @@
 //  Author:     Michał Górny
 //              Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "lzip_decoder.h"
diff --git a/src/liblzma/common/lzip_decoder.h b/src/liblzma/common/lzip_decoder.h
index 33a01c3..0e1f7be 100644
--- a/src/liblzma/common/lzip_decoder.h
+++ b/src/liblzma/common/lzip_decoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       lzip_decoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Michał Górny
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_LZIP_DECODER_H
diff --git a/src/liblzma/common/memcmplen.h b/src/liblzma/common/memcmplen.h
index 99d9c51..394a485 100644
--- a/src/liblzma/common/memcmplen.h
+++ b/src/liblzma/common/memcmplen.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       memcmplen.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_MEMCMPLEN_H
@@ -24,7 +23,8 @@
 // can use the intrinsics without the header file.
 #if defined(TUKLIB_FAST_UNALIGNED_ACCESS) \
 		&& defined(_MSC_VER) \
-		&& defined(_M_X64) \
+		&& (defined(_M_X64) \
+			|| defined(_M_ARM64) || defined(_M_ARM64EC)) \
 		&& !defined(__INTEL_COMPILER)
 #	include <intrin.h>
 #endif
@@ -57,20 +57,35 @@ lzma_memcmplen(const uint8_t *buf1, const uint8_t *buf2,
 	assert(limit <= UINT32_MAX / 2);
 
 #if defined(TUKLIB_FAST_UNALIGNED_ACCESS) \
-		&& ((TUKLIB_GNUC_REQ(3, 4) && defined(__x86_64__)) \
+		&& (((TUKLIB_GNUC_REQ(3, 4) || defined(__clang__)) \
+				&& (defined(__x86_64__) \
+					|| defined(__aarch64__))) \
 			|| (defined(__INTEL_COMPILER) && defined(__x86_64__)) \
 			|| (defined(__INTEL_COMPILER) && defined(_M_X64)) \
-			|| (defined(_MSC_VER) && defined(_M_X64)))
-	// I keep this x86-64 only for now since that's where I know this
-	// to be a good method. This may be fine on other 64-bit CPUs too.
-	// On big endian one should use xor instead of subtraction and switch
-	// to __builtin_clzll().
+			|| (defined(_MSC_VER) && (defined(_M_X64) \
+				|| defined(_M_ARM64) || defined(_M_ARM64EC))))
+	// This is only for x86-64 and ARM64 for now. This might be fine on
+	// other 64-bit processors too. On big endian one should use xor
+	// instead of subtraction and switch to __builtin_clzll().
+	//
+	// Reasons to use subtraction instead of xor:
+	//
+	//   - On some x86-64 processors (Intel Sandy Bridge to Tiger Lake),
+	//     sub+jz and sub+jnz can be fused but xor+jz or xor+jnz cannot.
+	//     Thus using subtraction has potential to be a tiny amount faster
+	//     since the code checks if the quotient is non-zero.
+	//
+	//   - Some processors (Intel Pentium 4) used to have more ALU
+	//     resources for add/sub instructions than and/or/xor.
+	//
+	// The processor info is based on Agner Fog's microarchitecture.pdf
+	// version 2023-05-26. https://www.agner.org/optimize/
 #define LZMA_MEMCMPLEN_EXTRA 8
 	while (len < limit) {
 		const uint64_t x = read64ne(buf1 + len) - read64ne(buf2 + len);
 		if (x != 0) {
 	// MSVC or Intel C compiler on Windows
-#	if (defined(_MSC_VER) || defined(__INTEL_COMPILER)) && defined(_M_X64)
+#	if defined(_MSC_VER) || defined(__INTEL_COMPILER)
 			unsigned long tmp;
 			_BitScanForward64(&tmp, x);
 			len += (uint32_t)tmp >> 3;
diff --git a/src/liblzma/common/microlzma_decoder.c b/src/liblzma/common/microlzma_decoder.c
index e473373..882cb2c 100644
--- a/src/liblzma/common/microlzma_decoder.c
+++ b/src/liblzma/common/microlzma_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       microlzma_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "lzma_decoder.h"
diff --git a/src/liblzma/common/microlzma_encoder.c b/src/liblzma/common/microlzma_encoder.c
index a787ca2..45ec0b1 100644
--- a/src/liblzma/common/microlzma_encoder.c
+++ b/src/liblzma/common/microlzma_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       microlzma_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "lzma_encoder.h"
diff --git a/src/liblzma/common/outqueue.c b/src/liblzma/common/outqueue.c
index 71e8648..eb018eb 100644
--- a/src/liblzma/common/outqueue.c
+++ b/src/liblzma/common/outqueue.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       outqueue.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "outqueue.h"
diff --git a/src/liblzma/common/outqueue.h b/src/liblzma/common/outqueue.h
index 596911e..25f0719 100644
--- a/src/liblzma/common/outqueue.h
+++ b/src/liblzma/common/outqueue.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       outqueue.h
@@ -5,11 +7,11 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
+#ifndef LZMA_OUTQUEUE_H
+#define LZMA_OUTQUEUE_H
+
 #include "common.h"
 
 
@@ -252,3 +254,5 @@ lzma_outq_outbuf_memusage(size_t buf_size)
 	assert(buf_size <= SIZE_MAX - sizeof(lzma_outbuf));
 	return sizeof(lzma_outbuf) + buf_size;
 }
+
+#endif
diff --git a/src/liblzma/common/stream_buffer_decoder.c b/src/liblzma/common/stream_buffer_decoder.c
index b9745b5..c4f91fb 100644
--- a/src/liblzma/common/stream_buffer_decoder.c
+++ b/src/liblzma/common/stream_buffer_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_buffer_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "stream_decoder.h"
diff --git a/src/liblzma/common/stream_buffer_encoder.c b/src/liblzma/common/stream_buffer_encoder.c
index 7315759..04d5869 100644
--- a/src/liblzma/common/stream_buffer_encoder.c
+++ b/src/liblzma/common/stream_buffer_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_buffer_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/stream_decoder.c b/src/liblzma/common/stream_decoder.c
index 6428381..7f42684 100644
--- a/src/liblzma/common/stream_decoder.c
+++ b/src/liblzma/common/stream_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "stream_decoder.h"
diff --git a/src/liblzma/common/stream_decoder.h b/src/liblzma/common/stream_decoder.h
index c13c6ba..5803715 100644
--- a/src/liblzma/common/stream_decoder.h
+++ b/src/liblzma/common/stream_decoder.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_decoder.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_STREAM_DECODER_H
diff --git a/src/liblzma/common/stream_decoder_mt.c b/src/liblzma/common/stream_decoder_mt.c
index 76212b4..244624a 100644
--- a/src/liblzma/common/stream_decoder_mt.c
+++ b/src/liblzma/common/stream_decoder_mt.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_decoder_mt.c
@@ -6,9 +8,6 @@
 //  Authors:    Sebastian Andrzej Siewior
 //              Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/stream_encoder.c b/src/liblzma/common/stream_encoder.c
index ee92046..e7e5b3f 100644
--- a/src/liblzma/common/stream_encoder.c
+++ b/src/liblzma/common/stream_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "block_encoder.h"
diff --git a/src/liblzma/common/stream_encoder_mt.c b/src/liblzma/common/stream_encoder_mt.c
index f64de9b..f0fef15 100644
--- a/src/liblzma/common/stream_encoder_mt.c
+++ b/src/liblzma/common/stream_encoder_mt.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_encoder_mt.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_encoder.h"
@@ -979,20 +978,18 @@ get_options(const lzma_mt *options, lzma_options_easy *opt_easy,
 		*filters = opt_easy->filters;
 	}
 
-	// Block size
-	if (options->block_size > 0) {
-		if (options->block_size > BLOCK_SIZE_MAX)
-			return LZMA_OPTIONS_ERROR;
-
+	// If the Block size is not set, determine it from the filter chain.
+	if (options->block_size > 0)
 		*block_size = options->block_size;
-	} else {
-		// Determine the Block size from the filter chain.
+	else
 		*block_size = lzma_mt_block_size(*filters);
-		if (*block_size == 0)
-			return LZMA_OPTIONS_ERROR;
 
-		assert(*block_size <= BLOCK_SIZE_MAX);
-	}
+	// UINT64_MAX > BLOCK_SIZE_MAX, so the second condition
+	// should be optimized out by any reasonable compiler.
+	// The second condition should be there in the unlikely event that
+	// the macros change and UINT64_MAX < BLOCK_SIZE_MAX.
+	if (*block_size > BLOCK_SIZE_MAX || *block_size == UINT64_MAX)
+		return LZMA_OPTIONS_ERROR;
 
 	// Calculate the maximum amount output that a single output buffer
 	// may need to hold. This is the same as the maximum total size of
diff --git a/src/liblzma/common/stream_flags_common.c b/src/liblzma/common/stream_flags_common.c
index fbe8eb8..41b8dcb 100644
--- a/src/liblzma/common/stream_flags_common.c
+++ b/src/liblzma/common/stream_flags_common.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_flags_common.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "stream_flags_common.h"
diff --git a/src/liblzma/common/stream_flags_common.h b/src/liblzma/common/stream_flags_common.h
index 84e96ba..28729db 100644
--- a/src/liblzma/common/stream_flags_common.h
+++ b/src/liblzma/common/stream_flags_common.h
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_flags_common.h
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifndef LZMA_STREAM_FLAGS_COMMON_H
diff --git a/src/liblzma/common/stream_flags_decoder.c b/src/liblzma/common/stream_flags_decoder.c
index b8d263b..522c98b 100644
--- a/src/liblzma/common/stream_flags_decoder.c
+++ b/src/liblzma/common/stream_flags_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_flags_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "stream_flags_common.h"
diff --git a/src/liblzma/common/stream_flags_encoder.c b/src/liblzma/common/stream_flags_encoder.c
index b98ab17..f94b5cd 100644
--- a/src/liblzma/common/stream_flags_encoder.c
+++ b/src/liblzma/common/stream_flags_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       stream_flags_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "stream_flags_common.h"
diff --git a/src/liblzma/common/string_conversion.c b/src/liblzma/common/string_conversion.c
index d2c1e80..c899783 100644
--- a/src/liblzma/common/string_conversion.c
+++ b/src/liblzma/common/string_conversion.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       string_conversion.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "filter_common.h"
@@ -218,12 +217,14 @@ typedef struct {
 	uint16_t offset;
 
 	union {
+		// NVHPC has problems with unions that contain pointers that
+		// are not the first members, so keep "map" at the top.
+		const name_value_map *map;
+
 		struct {
 			uint32_t min;
 			uint32_t max;
 		} range;
-
-		const name_value_map *map;
 	} u;
 } option_map;
 
@@ -250,7 +251,9 @@ static const char *parse_options(const char **const str, const char *str_end,
 		|| defined(HAVE_ENCODER_IA64) \
 		|| defined(HAVE_DECODER_IA64) \
 		|| defined(HAVE_ENCODER_SPARC) \
-		|| defined(HAVE_DECODER_SPARC)
+		|| defined(HAVE_DECODER_SPARC) \
+		|| defined(HAVE_ENCODER_RISCV) \
+		|| defined(HAVE_DECODER_RISCV)
 static const option_map bcj_optmap[] = {
 	{
 		.name = "start",
@@ -509,6 +512,11 @@ static const struct {
 	  &parse_bcj,     bcj_optmap, 1, 1, true },
 #endif
 
+#if defined(HAVE_ENCODER_RISCV) || defined(HAVE_DECODER_RISCV)
+	{ "riscv",        sizeof(lzma_options_bcj),   LZMA_FILTER_RISCV,
+	  &parse_bcj,     bcj_optmap, 1, 1, true },
+#endif
+
 #if defined(HAVE_ENCODER_POWERPC) || defined(HAVE_DECODER_POWERPC)
 	{ "powerpc",      sizeof(lzma_options_bcj),   LZMA_FILTER_POWERPC,
 	  &parse_bcj,     bcj_optmap, 1, 1, true },
@@ -994,6 +1002,12 @@ extern LZMA_API(const char *)
 lzma_str_to_filters(const char *str, int *error_pos, lzma_filter *filters,
 		uint32_t flags, const lzma_allocator *allocator)
 {
+	// If error_pos isn't NULL, *error_pos must always be set.
+	// liblzma <= 5.4.6 and <= 5.6.1 have a bug and don't do this
+	// when str == NULL or filters == NULL or flags are unsupported.
+	if (error_pos != NULL)
+		*error_pos = 0;
+
 	if (str == NULL || filters == NULL)
 		return "Unexpected NULL pointer argument(s) "
 				"to lzma_str_to_filters()";
diff --git a/src/liblzma/common/vli_decoder.c b/src/liblzma/common/vli_decoder.c
index af2799d..3254ccc 100644
--- a/src/liblzma/common/vli_decoder.c
+++ b/src/liblzma/common/vli_decoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       vli_decoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/vli_encoder.c b/src/liblzma/common/vli_encoder.c
index f864269..3859006 100644
--- a/src/liblzma/common/vli_encoder.c
+++ b/src/liblzma/common/vli_encoder.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       vli_encoder.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"
diff --git a/src/liblzma/common/vli_size.c b/src/liblzma/common/vli_size.c
index ec1b4fa..c8cb2ec 100644
--- a/src/liblzma/common/vli_size.c
+++ b/src/liblzma/common/vli_size.c
@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       vli_size.c
@@ -5,9 +7,6 @@
 //
 //  Author:     Lasse Collin
 //
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
 ///////////////////////////////////////////////////////////////////////////////
 
 #include "common.h"