tools/squashfs4/patches/160-expose_lzma_xz_options.patch

--- /dev/null
+++ b/squashfs-tools/lzma_xz_options.h
@@ -0,0 +1,115 @@
+#ifndef LZMA_XZ_OPTIONS_H
+#define LZMA_XZ_OPTIONS_H
+/*
+ * Copyright (c) 2011
+ * Jonas Gorski <jonas.gorski@gmail.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * lzma_options.h
+ */
+
+#include <stdint.h>
+
+#ifndef linux
+#ifdef __FreeBSD__
+#include <machine/endian.h>
+#endif
+#define __BYTE_ORDER BYTE_ORDER
+#define __BIG_ENDIAN BIG_ENDIAN
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#else
+#include <endian.h>
+#endif
+
+
+
+struct lzma_opts {
+	uint32_t dict_size;
+	uint32_t flags;
+#define LZMA_OPT_FLT_MASK	0xffff
+#define LZMA_OPT_PRE_OFF	16
+#define LZMA_OPT_PRE_MASK	(0xf << LZMA_OPT_PRE_OFF)
+#define LZMA_OPT_EXTREME	20	
+	uint16_t bit_opts;
+#define LZMA_OPT_LC_OFF		0
+#define LZMA_OPT_LC_MASK	(0x7 << LZMA_OPT_LC_OFF)
+#define LZMA_OPT_LP_OFF		3
+#define LZMA_OPT_LP_MASK	(0x7 << LZMA_OPT_LP_OFF)
+#define LZMA_OPT_PB_OFF		6
+#define LZMA_OPT_PB_MASK	(0x7 << LZMA_OPT_PB_OFF)
+	uint16_t fb;
+};
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+extern unsigned int inswap_le32(unsigned int);
+
+#define SQUASHFS_INSWAP_LZMA_COMP_OPTS(s) { \
+	(s)->flags = inswap_le32((s)->flags); \
+	(s)->bit_opts = inswap_le16((s)->bit_opts); \
+	(s)->fb = inswap_le16((s)->fb); \
+	(s)->dict_size = inswap_le32((s)->dict_size); \
+}
+#else
+#define SQUASHFS_INSWAP_LZMA_COMP_OPTS(s)
+#endif
+
+#define MEMLIMIT (32 * 1024 * 1024)
+
+#define LZMA_OPT_LC_MIN		0
+#define LZMA_OPT_LC_MAX		4
+#define LZMA_OPT_LC_DEFAULT	3
+
+#define LZMA_OPT_LP_MIN		0
+#define LZMA_OPT_LP_MAX		4
+#define LZMA_OPT_LP_DEFAULT	0
+
+#define LZMA_OPT_PB_MIN		0
+#define LZMA_OPT_PB_MAX		4
+#define LZMA_OPT_PB_DEFAULT	2
+
+#define LZMA_OPT_FB_MIN		5
+#define LZMA_OPT_FB_MAX		273
+#define LZMA_OPT_FB_DEFAULT	64
+
+enum {
+	LZMA_OPT_LZMA = 1,
+	LZMA_OPT_XZ
+};
+
+struct lzma_xz_options {
+	int preset;
+	int extreme;
+	int lc;
+	int lp;
+	int pb;
+	int fb;
+	int dict_size;
+	int flags;
+};
+
+struct lzma_xz_options *lzma_xz_get_options(void);
+
+int lzma_xz_options(char *argv[], int argc, int lzmaver);
+
+int lzma_xz_options_post(int block_size, int lzmaver);
+
+void *lzma_xz_dump_options(int block_size, int *size, int flags);
+
+int lzma_xz_extract_options(int block_size, void *buffer, int size, int lzmaver);
+
+void lzma_xz_usage(int lzmaver);
+
+#endif
--- /dev/null
+++ b/squashfs-tools/lzma_xz_options.c
@@ -0,0 +1,365 @@
+/*
+ * Copyright (c) 2011
+ * Jonas Gorski <jonas.gorski@gmail.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * lzma_options.c
+ * 
+ * Common options for LZMA1 and 2 compressors. Based on xz_wrapper.c
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include <lzma.h>
+
+#include "lzma_xz_options.h"
+
+static const char const *lzmaver_str[] = { "", "lzma", "xz" };
+
+static struct lzma_xz_options options = {
+	.flags		= 0,
+	.preset		= 6,
+	.extreme	= 0,
+	.lc		= LZMA_OPT_LC_DEFAULT,
+	.lp		= LZMA_OPT_LP_DEFAULT,
+	.pb		= LZMA_OPT_PB_DEFAULT,
+	.fb		= LZMA_OPT_FB_DEFAULT,
+	.dict_size	= 0,
+};
+
+static float lzma_dict_percent = 0;
+
+struct lzma_xz_options *lzma_xz_get_options(void)
+{
+	return &options;
+}
+
+
+int lzma_xz_options(char *argv[], int argc, int lzmaver)
+{
+	const char *comp_name = lzmaver_str[lzmaver];
+	
+	if(strcmp(argv[0], "-Xpreset") == 0) {
+		int preset;
+		
+		if(argc < 2) {
+			fprintf(stderr, "%s: -Xpreset missing preset\n", comp_name);
+			goto failed;
+		}
+		
+		preset = atoi(argv[1]);
+		
+		if (preset < 0 || preset > 9) {
+			fprintf(stderr, "%s: -Xpreset invalid value\n", comp_name);
+			goto failed;
+		}
+		options.preset = preset;
+		return 1;
+	} else if(strcmp(argv[0], "-Xe") == 0) {
+		options.extreme = 1;
+		return 0;
+	} else if(strcmp(argv[0], "-Xlc") == 0) {
+		int lc;
+		
+		if(argc < 2) {
+			fprintf(stderr, "%s: -Xlc missing lc\n", comp_name);
+			goto failed;
+		}
+		
+		lc = atoi(argv[1]);
+		
+		if (lc < LZMA_OPT_LC_MIN || lc > LZMA_OPT_LC_MAX) {
+			fprintf(stderr, "%s: -Xlc invalid value\n", comp_name);
+			goto failed;
+		}
+		options.lc = lc;
+		return 1;
+	} else if(strcmp(argv[0], "-Xlp") == 0) {
+		int lp;
+		
+		if(argc < 2) {
+			fprintf(stderr, "%s: -Xlp missing lp\n", comp_name);
+			goto failed;
+		}
+		
+		lp = atoi(argv[1]);
+		
+		if (lp < LZMA_OPT_LP_MIN || lp > LZMA_OPT_LP_MAX) {
+			fprintf(stderr, "%s: -Xlp invalid value\n", comp_name);
+			goto failed;
+		}
+		options.lp = lp;
+		return 1;
+	} else if(strcmp(argv[0], "-Xpb") == 0) {
+		int pb;
+		
+		if(argc < 2) {
+			fprintf(stderr, "%s: -Xpb missing pb\n", comp_name);
+			goto failed;
+		}
+		
+		pb = atoi(argv[1]);
+		
+		if (pb < LZMA_OPT_PB_MIN || pb > LZMA_OPT_PB_MAX) {
+			fprintf(stderr, "%s: -Xbp invalid value\n", comp_name);
+			goto failed;
+		}
+		options.pb = pb;
+		return 1;	
+	} else if(strcmp(argv[0], "-Xfb") == 0) {
+		int fb;
+		
+		if(argc < 2) {
+			fprintf(stderr, "%s: -Xfb missing fb\n", comp_name);
+			goto failed;
+		}
+		
+		fb = atoi(argv[1]);
+		
+		if (fb < LZMA_OPT_FB_MIN || fb > LZMA_OPT_FB_MAX) {
+			fprintf(stderr, "%s: -Xfb invalid value\n", comp_name);
+			goto failed;
+		}
+		options.fb = fb;
+		return 1;
+	} else if(strcmp(argv[0], "-Xdict-size") == 0) {
+		char *b;
+		float size;
+
+		if(argc < 2) {
+			fprintf(stderr, "%s: -Xdict-size missing dict-size\n", comp_name);
+			goto failed;
+		}
+
+		size = strtof(argv[1], &b);
+		if(*b == '%') {
+			if(size <= 0 || size > 100) {
+				fprintf(stderr, "%s: -Xdict-size percentage "
+					"should be 0 < dict-size <= 100\n", comp_name);
+				goto failed;
+			}
+
+			lzma_dict_percent = size;
+			options.dict_size = 0;
+		} else {
+			if((float) ((int) size) != size) {
+				fprintf(stderr, "%s: -Xdict-size can't be "
+					"fractional unless a percentage of the"
+					" block size\n", comp_name);
+				goto failed;
+			}
+
+			lzma_dict_percent = 0;
+			options.dict_size = (int) size;
+
+			if(*b == 'k' || *b == 'K')
+				options.dict_size *= 1024;
+			else if(*b == 'm' || *b == 'M')
+				options.dict_size *= 1024 * 1024;
+			else if(*b != '\0') {
+				fprintf(stderr, "%s: -Xdict-size invalid "
+					"dict-size\n", comp_name);
+				goto failed;
+			}
+		}
+
+		return 1;
+	}
+	
+	return -1;
+	
+failed:
+	return -2;
+
+}
+
+int lzma_xz_options_post(int block_size, int lzmaver)
+{
+	const char *comp_name = lzmaver_str[lzmaver];
+	/*
+	 * if -Xdict-size has been specified use this to compute the datablock
+	 * dictionary size
+	 */
+	if(options.dict_size || lzma_dict_percent) {
+		int dict_size_min = (lzmaver == 1 ? 4096 : 8192);
+		int n;
+
+		if(options.dict_size) {
+			if(options.dict_size > block_size) {
+				fprintf(stderr, "%s: -Xdict-size is larger than"
+				" block_size\n", comp_name);
+				goto failed;
+			}
+		} else
+			options.dict_size = block_size * lzma_dict_percent / 100;
+
+		if(options.dict_size < dict_size_min) {
+			fprintf(stderr, "%s: -Xdict-size should be %i bytes "
+				"or larger\n", comp_name, dict_size_min);
+			goto failed;
+		}
+
+		/*
+		 * dictionary_size must be storable in xz header as either
+		 * 2^n or as  2^n+2^(n+1)
+	 	*/
+		n = ffs(options.dict_size) - 1;
+		if(options.dict_size != (1 << n) &&
+				options.dict_size != ((1 << n) + (1 << (n + 1)))) {
+			fprintf(stderr, "%s: -Xdict-size is an unsupported "
+				"value, dict-size must be storable in %s "
+				"header\n", comp_name, comp_name);
+			fprintf(stderr, "as either 2^n or as 2^n+2^(n+1).  "
+				"Example dict-sizes are 75%%, 50%%, 37.5%%, "
+				"25%%,\n");
+			fprintf(stderr, "or 32K, 16K, 8K etc.\n");
+			goto failed;
+		}
+
+	} else
+		/* No -Xdict-size specified, use defaults */
+		options.dict_size = block_size;
+
+	return 0;
+
+failed:
+	return -1;
+}
+
+static struct lzma_opts lzma_comp_opts;
+
+void *lzma_xz_dump_options(int block_size, int *size, int flags)
+{
+	/* No need to store default options */
+	if (options.preset == 6 &&
+			options.extreme == 0 &&
+			options.lc == LZMA_OPT_LC_DEFAULT &&
+			options.lp == LZMA_OPT_LC_DEFAULT &&
+			options.pb == LZMA_OPT_PB_DEFAULT &&
+			options.fb == 0 &&
+			options.dict_size == block_size &&
+			flags == 0)
+		return NULL;
+	
+	*size = sizeof(struct lzma_opts);
+
+	lzma_comp_opts.flags |= flags;
+	
+	if (options.extreme)
+		lzma_comp_opts.flags |= LZMA_OPT_EXTREME;
+	
+	lzma_comp_opts.flags |= ((options.preset << LZMA_OPT_PRE_OFF) & LZMA_OPT_PRE_MASK);
+	
+	lzma_comp_opts.bit_opts = 
+			((options.lc << LZMA_OPT_LC_OFF) & LZMA_OPT_LC_MASK) |
+			((options.lp << LZMA_OPT_LP_OFF) & LZMA_OPT_LP_MASK) |
+			((options.pb << LZMA_OPT_PB_OFF) & LZMA_OPT_PB_MASK);
+	lzma_comp_opts.fb = options.fb;
+	lzma_comp_opts.dict_size = options.dict_size;
+	
+	SQUASHFS_INSWAP_LZMA_COMP_OPTS(&lzma_comp_opts);
+	
+	return &lzma_comp_opts;
+}
+
+int lzma_xz_extract_options(int block_size, void *buffer, int size, int lzmaver)
+{
+	if (size == 0) {
+		/* default options */
+		options.preset = 6;
+		options.extreme = 0;
+		options.lc = LZMA_OPT_LC_DEFAULT;
+		options.lp = LZMA_OPT_LC_DEFAULT;
+		options.pb = LZMA_OPT_PB_DEFAULT;
+		options.fb = LZMA_OPT_FB_DEFAULT;
+		options.dict_size = block_size;
+		options.flags = 0;
+	} else {
+		struct lzma_opts *comp_opts = buffer;
+		int n;
+		
+		if (size != sizeof(struct lzma_opts))
+			goto failed;
+		
+		SQUASHFS_INSWAP_LZMA_COMP_OPTS(comp_opts);
+		
+		options.flags = comp_opts->flags & LZMA_OPT_FLT_MASK;
+		options.preset  = (comp_opts->flags & LZMA_OPT_PRE_MASK) >> LZMA_OPT_PRE_OFF;
+		options.extreme = !!(comp_opts->flags & LZMA_OPT_EXTREME);
+
+		options.lc = (comp_opts->bit_opts & LZMA_OPT_LC_MASK) >> LZMA_OPT_LC_OFF;
+		options.lp = (comp_opts->bit_opts & LZMA_OPT_LP_MASK) >> LZMA_OPT_LP_OFF;
+		options.pb = (comp_opts->bit_opts & LZMA_OPT_PB_MASK) >> LZMA_OPT_PB_OFF;
+		options.fb = comp_opts->fb;
+		options.dict_size = comp_opts->dict_size;
+		
+		/* check that the LZMA bit options are in range */
+		if (options.lc < LZMA_OPT_LC_MIN || options.lc > LZMA_OPT_LC_MAX ||
+			options.lp < LZMA_OPT_LP_MIN || options.lp > LZMA_OPT_LP_MAX ||
+			options.pb < LZMA_OPT_PB_MIN || options.pb > LZMA_OPT_PB_MAX ||
+			options.fb < LZMA_OPT_FB_MIN || options.fb > LZMA_OPT_FB_MAX)
+			goto failed;
+
+		/*
+		 * check that the dictionary size seems correct - the dictionary
+		 * size should 2^n or 2^n+2^(n+1)
+		 */
+		n = ffs(options.dict_size) - 1;
+		if(options.dict_size != (1 << n) &&
+				options.dict_size != ((1 << n) + (1 << (n + 1))))
+			goto failed;
+		
+	}
+	
+	return 0;
+
+failed:
+	fprintf(stderr, "%s: error reading stored compressor options from "
+		"filesystem!\n", lzmaver_str[lzmaver]);
+	return -1;	
+}
+
+void lzma_xz_usage(int lzmaver)
+{
+	fprintf(stderr, "\t  -Xpreset <preset>\n");
+	fprintf(stderr, "\t\tcompression preset (0-9, default 6)\n");
+	fprintf(stderr, "\t  -Xe\n");
+	fprintf(stderr, "\t\tTry to improve compression ratio by using more ");
+	fprintf(stderr, "CPU time.\n");
+	fprintf(stderr, "\t  -Xlc <lc>\n");
+	fprintf(stderr, "\t\tNumber of literal context bits (0-4, default 3)\n");
+	fprintf(stderr, "\t  -Xlp <lp>\n");
+	fprintf(stderr, "\t\tNumber of literal position bits (0-4, default 0)\n");
+	fprintf(stderr, "\t  -Xpb <pb>\n");
+	fprintf(stderr, "\t\tNumber of position bits (0-4, default 2)\n");
+	fprintf(stderr, "\t  -Xnice <nice>\n");
+	fprintf(stderr, "\t\tNice length of a match (5-273, default 64)\n");
+	fprintf(stderr, "\t  -Xdict-size <dict-size>\n");
+	fprintf(stderr, "\t\tUse <dict-size> as the %s dictionary size.  The",
+			lzmaver == LZMA_OPT_LZMA ? "LZMA" : "XZ");
+	fprintf(stderr, " dictionary size\n\t\tcan be specified as a");
+	fprintf(stderr, " percentage of the block size, or as an\n\t\t");
+	fprintf(stderr, "absolute value.  The dictionary size must be less");
+	fprintf(stderr, " than or equal\n\t\tto the block size and %d bytes", 
+			lzmaver == LZMA_OPT_LZMA ? 4096 : 8192);
+	fprintf(stderr, " or larger.  It must also be\n\t\tstorable in the lzma");
+	fprintf(stderr, " header as either 2^n or as 2^n+2^(n+1).\n\t\t");
+	fprintf(stderr, "Example dict-sizes are 75%%, 50%%, 37.5%%, 25%%, or");
+	fprintf(stderr, " 32K, 16K, 8K\n\t\tetc.\n");
+	
+}
--- a/squashfs-tools/xz_wrapper_extended.c
+++ b/squashfs-tools/xz_wrapper_extended.c
@@ -32,6 +32,7 @@
 #include "squashfs_fs.h"
 #include "xz_wrapper.h"
 #include "compressor.h"
+#include "lzma_xz_options.h"
 
 static struct bcj bcj[] = {
 	{ "x86", LZMA_FILTER_X86, 0 },
@@ -44,12 +45,6 @@ static struct bcj bcj[] = {
 };
 
 static int filter_count = 1;
-static int dictionary_size = 0;
-static float dictionary_percent = 0;
-static int preset = LZMA_PRESET_DEFAULT;
-static int lc = -1;
-static int lp = -1;
-static int pb = -1;
 
 /*
  * This function is called by the options parsing code in mksquashfs.c
@@ -77,13 +72,13 @@ static int pb = -1;
  */
 static int xz_options(char *argv[], int argc)
 {
-	int i;
-	char *name;
-
 	if(strcmp(argv[0], "-Xbcj") == 0) {
+		int i;
+		char *name;
+
 		if(argc < 2) {
 			fprintf(stderr, "xz: -Xbcj missing filter\n");
-			goto failed;
+			return -2;
 		}
 
 		name = argv[1];
@@ -104,138 +99,14 @@ static int xz_options(char *argv[], int argc)
 			if(bcj[i].name == NULL) {
 				fprintf(stderr, "xz: -Xbcj unrecognised "
 					"filter\n");
-				goto failed;
-			}
-		}
-
-		return 1;
-	} else if(strcmp(argv[0], "-Xdict-size") == 0) {
-		char *b;
-		float size;
-
-		if(argc < 2) {
-			fprintf(stderr, "xz: -Xdict-size missing dict-size\n");
-			goto failed;
-		}
-
-		size = strtof(argv[1], &b);
-		if(*b == '%') {
-			if(size <= 0 || size > 100) {
-				fprintf(stderr, "xz: -Xdict-size percentage "
-					"should be 0 < dict-size <= 100\n");
-				goto failed;
-			}
-
-			dictionary_percent = size;
-			dictionary_size = 0;
-		} else {
-			if((float) ((int) size) != size) {
-				fprintf(stderr, "xz: -Xdict-size can't be "
-					"fractional unless a percentage of the"
-					" block size\n");
-				goto failed;
+				return -2;
 			}
-
-			dictionary_percent = 0;
-			dictionary_size = (int) size;
-
-			if(*b == 'k' || *b == 'K')
-				dictionary_size *= 1024;
-			else if(*b == 'm' || *b == 'M')
-				dictionary_size *= 1024 * 1024;
-			else if(*b != '\0') {
-				fprintf(stderr, "xz: -Xdict-size invalid "
-					"dict-size\n");
-				goto failed;
-			}
-		}
-
-		return 1;
-	} else if(strcmp(argv[0], "-Xpreset") == 0) {
-		char *b;
-		long val;
-
-		if(argc < 2) {
-			fprintf(stderr, "xz: -Xpreset missing preset-level "
-				"(valid value 0-9)\n");
-			goto failed;
-		}
-
-		val = strtol(argv[1], &b, 10);
-		if (*b != '\0' || (int) val < 0 || (int) val & ~LZMA_PRESET_LEVEL_MASK) {
-			fprintf(stderr, "xz: -Xpreset can't be "
-				"negative or more than the max preset\n");
-			goto failed;
-		}
-
-		preset &= ~LZMA_PRESET_LEVEL_MASK;
-		preset |= (int) val;
-
-		return 1;
-	} else if(strcmp(argv[0], "-Xe") == 0) {
-		preset |= LZMA_PRESET_EXTREME;
-
-		return 0;
-	} else if(strcmp(argv[0], "-Xlc") == 0) {
-		char *b;
-		long val;
-
-		if(argc < 2) {
-			fprintf(stderr, "xz: -Xlc missing value\n");
-			goto failed;
-		}
-
-		val = strtol(argv[1], &b, 10);
-		if (*b != '\0' || (int) val < LZMA_LCLP_MIN || (int) val > LZMA_LCLP_MAX) {
-			fprintf(stderr, "xz: -Xlc invalid value\n");
-			goto failed;
-		}
-
-		lc = (int) val;
-
-		return 1;
-	} else if(strcmp(argv[0], "-Xlp") == 0) {
-		char *b;
-		long val;
-
-		if(argc < 2) {
-			fprintf(stderr, "xz: -Xlp missing value\n");
-			goto failed;
-		}
-
-		val = strtol(argv[1], &b, 10);
-		if (*b != '\0' || (int) val < LZMA_LCLP_MIN || (int) val > LZMA_LCLP_MAX) {
-			fprintf(stderr, "xz: -Xlp invalid value\n");
-			goto failed;
-		}
-
-		lp = (int) val;
-
-		return 1;
-	} else if(strcmp(argv[0], "-Xpb") == 0) {
-		char *b;
-		long val;
-
-		if(argc < 2) {
-			fprintf(stderr, "xz: -Xpb missing value\n");
-			goto failed;
-		}
-
-		val = strtol(argv[1], &b, 10);
-		if (*b != '\0' || (int) val < LZMA_PB_MIN || (int) val > LZMA_PB_MAX) {
-			fprintf(stderr, "xz: -Xpb invalid value\n");
-			goto failed;
 		}
 
-		pb = (int) val;
-
 		return 1;
+	} else {
+		return lzma_xz_options(argv, argc, LZMA_OPT_XZ);
 	}
-
-	return -1;
-
-failed:
-	return -2;
 }
 
 
@@ -252,53 +123,7 @@ failed:
  */
 static int xz_options_post(int block_size)
 {
-	/*
-	 * if -Xdict-size has been specified use this to compute the datablock
-	 * dictionary size
-	 */
-	if(dictionary_size || dictionary_percent) {
-		int n;
-
-		if(dictionary_size) {
-			if(dictionary_size > block_size) {
-				fprintf(stderr, "xz: -Xdict-size is larger than"
-				" block_size\n");
-				goto failed;
-			}
-		} else
-			dictionary_size = block_size * dictionary_percent / 100;
-
-		if(dictionary_size < 8192) {
-			fprintf(stderr, "xz: -Xdict-size should be 8192 bytes "
-				"or larger\n");
-			goto failed;
-		}
-
-		/*
-		 * dictionary_size must be storable in xz header as either
-		 * 2^n or as  2^n+2^(n+1)
-		 */
-		n = ffs(dictionary_size) - 1;
-		if(dictionary_size != (1 << n) &&
-				dictionary_size != ((1 << n) + (1 << (n + 1)))) {
-			fprintf(stderr, "xz: -Xdict-size is an unsupported "
-				"value, dict-size must be storable in xz "
-				"header\n");
-			fprintf(stderr, "as either 2^n or as 2^n+2^(n+1).  "
-				"Example dict-sizes are 75%%, 50%%, 37.5%%, "
-				"25%%,\n");
-			fprintf(stderr, "or 32K, 16K, 8K etc.\n");
-			goto failed;
-		}
-
-	} else
-		/* No -Xdict-size specified, use defaults */
-		dictionary_size = block_size;
-
-	return 0;
-
-failed:
-	return -1;
+	return lzma_xz_options_post(block_size, LZMA_OPT_XZ);
 }
 
 
@@ -314,32 +139,12 @@ failed:
  */
 static void *xz_dump_options(int block_size, int *size)
 {
-	static struct comp_opts comp_opts;
 	int flags = 0, i;
 
-	/*
-	 * don't store compressor specific options in file system if the
-	 * default options are being used - no compressor options in the
-	 * file system means the default options are always assumed
-	 *
-	 * Defaults are:
-	 *  metadata dictionary size: SQUASHFS_METADATA_SIZE
-	 *  datablock dictionary size: block_size
-	 *  1 filter
-	 */
-	if(dictionary_size == block_size && filter_count == 1)
-		return NULL;
-
 	for(i = 0; bcj[i].name; i++)
 		flags |= bcj[i].selected << i;
 
-	comp_opts.dictionary_size = dictionary_size;
-	comp_opts.flags = flags;
-
-	SQUASHFS_INSWAP_COMP_OPTS(&comp_opts);
-
-	*size = sizeof(comp_opts);
-	return &comp_opts;
+	return lzma_xz_dump_options(block_size, size, flags);
 }
 
 
@@ -365,49 +170,20 @@ static void *xz_dump_options(int block_size, int *size)
  */
 static int xz_extract_options(int block_size, void *buffer, int size)
 {
-	struct comp_opts *comp_opts = buffer;
-	int flags, i, n;
-
-	if(size == 0) {
-		/* set defaults */
-		dictionary_size = block_size;
-		flags = 0;
-	} else {
-		/* check passed comp opts struct is of the correct length */
-		if(size != sizeof(struct comp_opts))
-			goto failed;
-
-		SQUASHFS_INSWAP_COMP_OPTS(comp_opts);
-
-		dictionary_size = comp_opts->dictionary_size;
-		flags = comp_opts->flags;
-
-		/*
-		 * check that the dictionary size seems correct - the dictionary
-		 * size should 2^n or 2^n+2^(n+1)
-		 */
-		n = ffs(dictionary_size) - 1;
-		if(dictionary_size != (1 << n) &&
-				dictionary_size != ((1 << n) + (1 << (n + 1))))
-			goto failed;
-	}
-
-	filter_count = 1;
-	for(i = 0; bcj[i].name; i++) {
-		if((flags >> i) & 1) {
-			bcj[i].selected = 1;
-			filter_count ++;
-		} else
-			bcj[i].selected = 0;
+	int ret = lzma_xz_extract_options(block_size, buffer, size, LZMA_OPT_XZ);
+
+	if (!ret) {
+		int i;
+		struct lzma_xz_options *opts = lzma_xz_get_options();
+		for(i = 0; bcj[i].name; i++) {
+			if((opts->flags >> i) & 1) {
+				bcj[i].selected = 1;
+				filter_count ++;
+			} else
+				bcj[i].selected = 0;
+		}
 	}
-
-	return 0;
-
-failed:
-	fprintf(stderr, "xz: error reading stored compressor options from "
-		"filesystem!\n");
-
-	return -1;
+	return ret;
 }
 
 
@@ -474,6 +250,7 @@ static int xz_init(void **strm, int block_size, int datablock)
 	int i, j, filters = datablock ? filter_count : 1;
 	struct filter *filter = malloc(filters * sizeof(struct filter));
 	struct xz_stream *stream;
+	struct lzma_xz_options *opts = lzma_xz_get_options();
 
 	if(filter == NULL)
 		goto failed;
@@ -487,7 +264,7 @@ static int xz_init(void **strm, int block_size, int datablock)
 
 	memset(filter, 0, filters * sizeof(struct filter));
 
-	stream->dictionary_size = datablock ? dictionary_size :
+	stream->dictionary_size = datablock ? opts->dict_size :
 		SQUASHFS_METADATA_SIZE;
 
 	filter[0].filter[0].id = LZMA_FILTER_LZMA2;
@@ -529,25 +306,27 @@ static int xz_compress(void *strm, void *dest, void *src,  int size,
         lzma_ret res = 0;
 	struct xz_stream *stream = strm;
 	struct filter *selected = NULL;
+	struct lzma_xz_options *opts = lzma_xz_get_options();
 
 	stream->filter[0].buffer = dest;
 
 	for(i = 0; i < stream->filters; i++) {
+		uint32_t preset = opts->preset;
 		struct filter *filter = &stream->filter[i];
 
+		if (opts->extreme)
+			preset |= LZMA_PRESET_EXTREME;
+
 		if(lzma_lzma_preset(&stream->opt, preset))
 			goto failed;
 
-		stream->opt.dict_size = stream->dictionary_size;
+		stream->opt.lc = opts->lc;
+		stream->opt.lp = opts->lp;
+		stream->opt.pb = opts->pb;
+		if (opts->fb)
+			stream->opt.nice_len = opts->fb;
 
-		if (lc >= 0)
-			stream->opt.lc = lc;
-
-		if (lp >= 0)
-			stream->opt.lp = lp;
-
-		if (pb >= 0)
-			stream->opt.pb = pb;
+		stream->opt.dict_size = stream->dictionary_size;
 
 		filter->length = 0;
 		res = lzma_stream_buffer_encode(filter->filter,
@@ -603,32 +382,13 @@ static int xz_uncompress(void *dest, void *src, int size, int outsize,
 
 static void xz_usage(FILE *stream)
 {
+	lzma_xz_usage(LZMA_OPT_XZ);
 	fprintf(stream, "\t  -Xbcj filter1,filter2,...,filterN\n");
 	fprintf(stream, "\t\tCompress using filter1,filter2,...,filterN in");
 	fprintf(stream, " turn\n\t\t(in addition to no filter), and choose");
 	fprintf(stream, " the best compression.\n");
 	fprintf(stream, "\t\tAvailable filters: x86, arm, armthumb,");
 	fprintf(stream, " powerpc, sparc, ia64\n");
-	fprintf(stream, "\t  -Xdict-size <dict-size>\n");
-	fprintf(stream, "\t\tUse <dict-size> as the XZ dictionary size.  The");
-	fprintf(stream, " dictionary size\n\t\tcan be specified as a");
-	fprintf(stream, " percentage of the block size, or as an\n\t\t");
-	fprintf(stream, "absolute value.  The dictionary size must be less");
-	fprintf(stream, " than or equal\n\t\tto the block size and 8192 bytes");
-	fprintf(stream, " or larger.  It must also be\n\t\tstorable in the xz");
-	fprintf(stream, " header as either 2^n or as 2^n+2^(n+1).\n\t\t");
-	fprintf(stream, "Example dict-sizes are 75%%, 50%%, 37.5%%, 25%%, or");
-	fprintf(stream, " 32K, 16K, 8K\n\t\tetc.\n");
-	fprintf(stream, "\t  -Xpreset <preset-level>\n");
-	fprintf(stream, "\t\tUse <preset-value> as the custom preset to use");
-	fprintf(stream, " on compress.\n\t\t<preset-level> should be 0 .. 9");
-	fprintf(stream, " (default 6)\n");
-	fprintf(stream, "\t  -Xe\n");
-	fprintf(stream, "\t\tEnable additional compression settings by passing");
-	fprintf(stream, " the EXTREME\n\t\tflag to the compression flags.\n");
-	fprintf(stream, "\t  -Xlc <value>\n");
-	fprintf(stream, "\t  -Xlp <value>\n");
-	fprintf(stream, "\t  -Xpb <value>\n");
 }
 
 
--- a/squashfs-tools/Makefile
+++ b/squashfs-tools/Makefile
@@ -263,6 +263,8 @@ COMPRESSORS += xz
 endif
 
 ifneq ($(LZMA_XZ_SUPPORT)$(XZ_SUPPORT),)
+MKSQUASHFS_OBJS += lzma_xz_options.o
+UNSQUASHFS_OBJS += lzma_xz_options.o
 ifneq ($(LZMA_LIB),)
 MKSQUASHFS_OBJS += $(LZMA_LIB)
 UNSQUASHFS_OBJS += $(LZMA_LIB)