1 files changed, 0 insertions, 420 deletions
diff --git a/contrib/linux-kernel/0006-squashfs-tools-Add-zstd-support.patch b/contrib/linux-kernel/0006-squashfs-tools-Add-zstd-support.patch
deleted file mode 100644
index 00d24e2b..00000000
--- a/contrib/linux-kernel/0006-squashfs-tools-Add-zstd-support.patch
+++ /dev/null
@@ -1,420 +0,0 @@
-From 57a3cf95b276946559f9e044c7352c11303bb9c1 Mon Sep 17 00:00:00 2001
-From: Sean Purcell <me@seanp.xyz>
-Date: Thu, 3 Aug 2017 17:47:03 -0700
-Subject: [PATCH v6] squashfs-tools: Add zstd support
-
-This patch adds zstd support to squashfs-tools. It works with zstd
-versions >= 1.0.0. It was originally written by Sean Purcell.
-
-Signed-off-by: Sean Purcell <me@seanp.xyz>
-Signed-off-by: Nick Terrell <terrelln@fb.com>
----
-v4 -> v5:
-- Fix patch documentation to reflect that Sean Purcell is the author
-- Don't strip trailing whitespace of unrelated code
-- Make zstd_display_options() static
-
-v5 -> v6:
-- Fix build instructions in Makefile
-
- squashfs-tools/Makefile       |  20 ++++
- squashfs-tools/compressor.c   |   8 ++
- squashfs-tools/squashfs_fs.h  |   1 +
- squashfs-tools/zstd_wrapper.c | 254 ++++++++++++++++++++++++++++++++++++++++++
- squashfs-tools/zstd_wrapper.h |  48 ++++++++
- 5 files changed, 331 insertions(+)
- create mode 100644 squashfs-tools/zstd_wrapper.c
- create mode 100644 squashfs-tools/zstd_wrapper.h
-
-diff --git a/squashfs-tools/Makefile b/squashfs-tools/Makefile
-index 52d2582..22fc559 100644
---- a/squashfs-tools/Makefile
-+++ b/squashfs-tools/Makefile
-@@ -75,6 +75,18 @@ GZIP_SUPPORT = 1
- #LZMA_SUPPORT = 1
- #LZMA_DIR = ../../../../LZMA/lzma465
-
-+
-+########### Building ZSTD support ############
-+#
-+# The ZSTD library is supported
-+# ZSTD homepage: http://zstd.net
-+# ZSTD source repository: https://github.com/facebook/zstd
-+#
-+# To build using the ZSTD library - install the library and uncomment the
-+# ZSTD_SUPPORT line below.
-+#
-+#ZSTD_SUPPORT = 1
-+
- ######## Specifying default compression ########
- #
- # The next line specifies which compression algorithm is used by default
-@@ -177,6 +189,14 @@ LIBS += -llz4
- COMPRESSORS += lz4
- endif
-
-+ifeq ($(ZSTD_SUPPORT),1)
-+CFLAGS += -DZSTD_SUPPORT
-+MKSQUASHFS_OBJS += zstd_wrapper.o
-+UNSQUASHFS_OBJS += zstd_wrapper.o
-+LIBS += -lzstd
-+COMPRESSORS += zstd
-+endif
-+
- ifeq ($(XATTR_SUPPORT),1)
- ifeq ($(XATTR_DEFAULT),1)
- CFLAGS += -DXATTR_SUPPORT -DXATTR_DEFAULT
-diff --git a/squashfs-tools/compressor.c b/squashfs-tools/compressor.c
-index 525e316..02b5e90 100644
---- a/squashfs-tools/compressor.c
-+++ b/squashfs-tools/compressor.c
-@@ -65,6 +65,13 @@ static struct compressor xz_comp_ops = {
- extern struct compressor xz_comp_ops;
- #endif
-
-+#ifndef ZSTD_SUPPORT
-+static struct compressor zstd_comp_ops = {
-+	ZSTD_COMPRESSION, "zstd"
-+};
-+#else
-+extern struct compressor zstd_comp_ops;
-+#endif
-
- static struct compressor unknown_comp_ops = {
- 	0, "unknown"
-@@ -77,6 +84,7 @@ struct compressor *compressor[] = {
- 	&lzo_comp_ops,
- 	&lz4_comp_ops,
- 	&xz_comp_ops,
-+	&zstd_comp_ops,
- 	&unknown_comp_ops
- };
-
-diff --git a/squashfs-tools/squashfs_fs.h b/squashfs-tools/squashfs_fs.h
-index 791fe12..afca918 100644
---- a/squashfs-tools/squashfs_fs.h
-+++ b/squashfs-tools/squashfs_fs.h
-@@ -277,6 +277,7 @@ typedef long long		squashfs_inode;
- #define LZO_COMPRESSION		3
- #define XZ_COMPRESSION		4
- #define LZ4_COMPRESSION		5
-+#define ZSTD_COMPRESSION	6
-
- struct squashfs_super_block {
- 	unsigned int		s_magic;
-diff --git a/squashfs-tools/zstd_wrapper.c b/squashfs-tools/zstd_wrapper.c
-new file mode 100644
-index 0000000..dcab75a
---- /dev/null
-+++ b/squashfs-tools/zstd_wrapper.c
-@@ -0,0 +1,254 @@
-+/*
-+ * Copyright (c) 2017
-+ * Phillip Lougher <phillip@squashfs.org.uk>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version 2,
-+ * or (at your option) any later version.
-+ *
-+ * This program 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 General Public License for more details.
-+ *
-+ * zstd_wrapper.c
-+ *
-+ * Support for ZSTD compression http://zstd.net
-+ */
-+
-+#include <stdio.h>
-+#include <string.h>
-+#include <stdlib.h>
-+#include <zstd.h>
-+#include <zstd_errors.h>
-+
-+#include "squashfs_fs.h"
-+#include "zstd_wrapper.h"
-+#include "compressor.h"
-+
-+static int compression_level = ZSTD_DEFAULT_COMPRESSION_LEVEL;
-+
-+/*
-+ * This function is called by the options parsing code in mksquashfs.c
-+ * to parse any -X compressor option.
-+ *
-+ * This function returns:
-+ *	>=0 (number of additional args parsed) on success
-+ *	-1 if the option was unrecognised, or
-+ *	-2 if the option was recognised, but otherwise bad in
-+ *	   some way (e.g. invalid parameter)
-+ *
-+ * Note: this function sets internal compressor state, but does not
-+ * pass back the results of the parsing other than success/failure.
-+ * The zstd_dump_options() function is called later to get the options in
-+ * a format suitable for writing to the filesystem.
-+ */
-+static int zstd_options(char *argv[], int argc)
-+{
-+	if (strcmp(argv[0], "-Xcompression-level") == 0) {
-+		if (argc < 2) {
-+			fprintf(stderr, "zstd: -Xcompression-level missing "
-+				"compression level\n");
-+			fprintf(stderr, "zstd: -Xcompression-level it should "
-+				"be 1 <= n <= %d\n", ZSTD_maxCLevel());
-+			goto failed;
-+		}
-+
-+		compression_level = atoi(argv[1]);
-+		if (compression_level < 1 ||
-+		    compression_level > ZSTD_maxCLevel()) {
-+			fprintf(stderr, "zstd: -Xcompression-level invalid, it "
-+				"should be 1 <= n <= %d\n", ZSTD_maxCLevel());
-+			goto failed;
-+		}
-+
-+		return 1;
-+	}
-+
-+	return -1;
-+failed:
-+	return -2;
-+}
-+
-+/*
-+ * This function is called by mksquashfs to dump the parsed
-+ * compressor options in a format suitable for writing to the
-+ * compressor options field in the filesystem (stored immediately
-+ * after the superblock).
-+ *
-+ * This function returns a pointer to the compression options structure
-+ * to be stored (and the size), or NULL if there are no compression
-+ * options.
-+ */
-+static void *zstd_dump_options(int block_size, int *size)
-+{
-+	static struct zstd_comp_opts comp_opts;
-+
-+	/* don't return anything if the options are all default */
-+	if (compression_level == ZSTD_DEFAULT_COMPRESSION_LEVEL)
-+		return NULL;
-+
-+	comp_opts.compression_level = compression_level;
-+
-+	SQUASHFS_INSWAP_COMP_OPTS(&comp_opts);
-+
-+	*size = sizeof(comp_opts);
-+	return &comp_opts;
-+}
-+
-+/*
-+ * This function is a helper specifically for the append mode of
-+ * mksquashfs.  Its purpose is to set the internal compressor state
-+ * to the stored compressor options in the passed compressor options
-+ * structure.
-+ *
-+ * In effect this function sets up the compressor options
-+ * to the same state they were when the filesystem was originally
-+ * generated, this is to ensure on appending, the compressor uses
-+ * the same compression options that were used to generate the
-+ * original filesystem.
-+ *
-+ * Note, even if there are no compressor options, this function is still
-+ * called with an empty compressor structure (size == 0), to explicitly
-+ * set the default options, this is to ensure any user supplied
-+ * -X options on the appending mksquashfs command line are over-ridden.
-+ *
-+ * This function returns 0 on successful extraction of options, and -1 on error.
-+ */
-+static int zstd_extract_options(int block_size, void *buffer, int size)
-+{
-+	struct zstd_comp_opts *comp_opts = buffer;
-+
-+	if (size == 0) {
-+		/* Set default values */
-+		compression_level = ZSTD_DEFAULT_COMPRESSION_LEVEL;
-+		return 0;
-+	}
-+
-+	/* we expect a comp_opts structure of sufficient size to be present */
-+	if (size < sizeof(*comp_opts))
-+		goto failed;
-+
-+	SQUASHFS_INSWAP_COMP_OPTS(comp_opts);
-+
-+	if (comp_opts->compression_level < 1 ||
-+	    comp_opts->compression_level > ZSTD_maxCLevel()) {
-+		fprintf(stderr, "zstd: bad compression level in compression "
-+			"options structure\n");
-+		goto failed;
-+	}
-+
-+	compression_level = comp_opts->compression_level;
-+
-+	return 0;
-+
-+failed:
-+	fprintf(stderr, "zstd: error reading stored compressor options from "
-+		"filesystem!\n");
-+
-+	return -1;
-+}
-+
-+static void zstd_display_options(void *buffer, int size)
-+{
-+	struct zstd_comp_opts *comp_opts = buffer;
-+
-+	/* we expect a comp_opts structure of sufficient size to be present */
-+	if (size < sizeof(*comp_opts))
-+		goto failed;
-+
-+	SQUASHFS_INSWAP_COMP_OPTS(comp_opts);
-+
-+	if (comp_opts->compression_level < 1 ||
-+	    comp_opts->compression_level > ZSTD_maxCLevel()) {
-+		fprintf(stderr, "zstd: bad compression level in compression "
-+			"options structure\n");
-+		goto failed;
-+	}
-+
-+	printf("\tcompression-level %d\n", comp_opts->compression_level);
-+
-+	return;
-+
-+failed:
-+	fprintf(stderr, "zstd: error reading stored compressor options from "
-+		"filesystem!\n");
-+}
-+
-+/*
-+ * This function is called by mksquashfs to initialise the
-+ * compressor, before compress() is called.
-+ *
-+ * This function returns 0 on success, and -1 on error.
-+ */
-+static int zstd_init(void **strm, int block_size, int datablock)
-+{
-+	ZSTD_CCtx *cctx = ZSTD_createCCtx();
-+
-+	if (!cctx) {
-+		fprintf(stderr, "zstd: failed to allocate compression "
-+			"context!\n");
-+		return -1;
-+	}
-+
-+	*strm = cctx;
-+	return 0;
-+}
-+
-+static int zstd_compress(void *strm, void *dest, void *src, int size,
-+			 int block_size, int *error)
-+{
-+	const size_t res = ZSTD_compressCCtx((ZSTD_CCtx*)strm, dest, block_size,
-+					     src, size, compression_level);
-+
-+	if (ZSTD_isError(res)) {
-+		/* FIXME:
-+		 * zstd does not expose stable error codes. The error enum may
-+		 * change between versions. Until upstream zstd stablizes the
-+		 * error codes, we have no way of knowing why the error occurs.
-+		 * zstd shouldn't fail to compress any input unless there isn't
-+		 * enough output space. We assume that is the cause and return
-+		 * the special error code for not enough output space.
-+		 */
-+		return 0;
-+	}
-+
-+	return (int)res;
-+}
-+
-+static int zstd_uncompress(void *dest, void *src, int size, int outsize,
-+			   int *error)
-+{
-+	const size_t res = ZSTD_decompress(dest, outsize, src, size);
-+
-+	if (ZSTD_isError(res)) {
-+		fprintf(stderr, "\t%d %d\n", outsize, size);
-+
-+		*error = (int)ZSTD_getErrorCode(res);
-+		return -1;
-+	}
-+
-+	return (int)res;
-+}
-+
-+static void zstd_usage(void)
-+{
-+	fprintf(stderr, "\t  -Xcompression-level <compression-level>\n");
-+	fprintf(stderr, "\t\t<compression-level> should be 1 .. %d (default "
-+		"%d)\n", ZSTD_maxCLevel(), ZSTD_DEFAULT_COMPRESSION_LEVEL);
-+}
-+
-+struct compressor zstd_comp_ops = {
-+	.init = zstd_init,
-+	.compress = zstd_compress,
-+	.uncompress = zstd_uncompress,
-+	.options = zstd_options,
-+	.dump_options = zstd_dump_options,
-+	.extract_options = zstd_extract_options,
-+	.display_options = zstd_display_options,
-+	.usage = zstd_usage,
-+	.id = ZSTD_COMPRESSION,
-+	.name = "zstd",
-+	.supported = 1
-+};
-diff --git a/squashfs-tools/zstd_wrapper.h b/squashfs-tools/zstd_wrapper.h
-new file mode 100644
-index 0000000..4fbef0a
---- /dev/null
-+++ b/squashfs-tools/zstd_wrapper.h
-@@ -0,0 +1,48 @@
-+#ifndef ZSTD_WRAPPER_H
-+#define ZSTD_WRAPPER_H
-+/*
-+ * Squashfs
-+ *
-+ * Copyright (c) 2017
-+ * Phillip Lougher <phillip@squashfs.org.uk>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version 2,
-+ * or (at your option) any later version.
-+ *
-+ * This program 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 General Public License for more details.
-+ *
-+ * zstd_wrapper.h
-+ *
-+ */
-+
-+#ifndef linux
-+#define __BYTE_ORDER BYTE_ORDER
-+#define __BIG_ENDIAN BIG_ENDIAN
-+#define __LITTLE_ENDIAN LITTLE_ENDIAN
-+#else
-+#include <endian.h>
-+#endif
-+
-+#if __BYTE_ORDER == __BIG_ENDIAN
-+extern unsigned int inswap_le16(unsigned short);
-+extern unsigned int inswap_le32(unsigned int);
-+
-+#define SQUASHFS_INSWAP_COMP_OPTS(s) { \
-+	(s)->compression_level = inswap_le32((s)->compression_level); \
-+}
-+#else
-+#define SQUASHFS_INSWAP_COMP_OPTS(s)
-+#endif
-+
-+/* Default compression */
-+#define ZSTD_DEFAULT_COMPRESSION_LEVEL 15
-+
-+struct zstd_comp_opts {
-+	int compression_level;
-+};
-+#endif
---
-2.9.5