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From dcb976fe4ee40e4bac8ae0dcc836629c625a6fd4 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Fri, 14 Oct 2022 15:59:16 +0200
Subject: [PATCH] xz_wrapper: support multiple lzma configuration options
Add option to configure preset, lc, lp and pb lzma parameters.
-Xpreset can be used to set the compression level.
-Xe can be used to set the 'EXTREME' flag to use the lzma compression
options tweaking additional settings on top of the compression level set.
New option added:
-Xpreset
-Xe
-Xlc
-Xlp
-Xpb
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
squashfs-tools/xz_wrapper.c | 119 ++++++++++++++++++++++++++++++++++--
1 file changed, 115 insertions(+), 4 deletions(-)
--- a/squashfs-tools/xz_wrapper.c
+++ b/squashfs-tools/xz_wrapper.c
@@ -44,7 +44,10 @@ 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
@@ -53,6 +56,11 @@ static float dictionary_percent = 0;
* Two specific options are supported:
* -Xbcj
* -Xdict-size
+ * -Xpreset
+ * -Xe
+ * -Xlc
+ * -Xlp
+ * -Xpb
*
* This function returns:
* >=0 (number of additional args parsed) on success
@@ -141,6 +149,85 @@ static int xz_options(char *argv[], int
}
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;
}
return -1;
@@ -446,11 +533,20 @@ static int xz_compress(void *strm, void
for(i = 0; i < stream->filters; i++) {
struct filter *filter = &stream->filter[i];
- if(lzma_lzma_preset(&stream->opt, LZMA_PRESET_DEFAULT))
- goto failed;
+ if(lzma_lzma_preset(&stream->opt, preset))
+ goto failed;
stream->opt.dict_size = stream->dictionary_size;
+ if (lc >= 0)
+ stream->opt.lc = lc;
+
+ if (lp >= 0)
+ stream->opt.lp = lp;
+
+ if (pb >= 0)
+ stream->opt.pb = pb;
+
filter->length = 0;
res = lzma_stream_buffer_encode(filter->filter,
LZMA_CHECK_CRC32, NULL, src, size, filter->buffer,
@@ -521,13 +617,28 @@ static void xz_usage(FILE *stream)
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");
}
static int option_args(char *option)
{
if(strcmp(option, "-Xbcj") == 0 ||
- strcmp(option, "-Xdict-size") == 0)
+ strcmp(option, "-Xdict-size") == 0 ||
+ strcmp(option, "-Xpreset") == 0 ||
+ strcmp(option, "-Xe") == 0 ||
+ strcmp(option, "-Xlc") == 0 ||
+ strcmp(option, "-Xlp") == 0 ||
+ strcmp(option, "-Xpb") == 0)
return 1;
return 0;
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