Add --no-adjust.

src/xz/args.c

@@ -45,6 +45,7 @@ parse_real(args_info *args, int argc, char **argv)
 		OPT_NO_SPARSE,
 		OPT_FILES,
 		OPT_FILES0,
+		OPT_NO_ADJUST,
 		OPT_INFO_MEMORY,
 		OPT_ROBOT,
 	};
@@ -74,6 +75,7 @@ parse_real(args_info *args, int argc, char **argv)
 		// Basic compression settings
 		{ "format",       required_argument, NULL,  'F' },
 		{ "check",        required_argument, NULL,  'C' },
+		{ "no-adjust",    no_argument,       NULL,  OPT_NO_ADJUST },
 		{ "memory",       required_argument, NULL,  'M' },
 		{ "threads",      required_argument, NULL,  'T' },
 
@@ -367,6 +369,10 @@ parse_real(args_info *args, int argc, char **argv)
 
 			break;
 
+		case OPT_NO_ADJUST:
+			opt_auto_adjust = false;
+			break;
+
 		default:
 			message_try_help();
 			tuklib_exit(E_ERROR, E_ERROR, false);

src/xz/coder.c

@@ -22,8 +22,8 @@ enum coder_init_ret {
 
 
 enum operation_mode opt_mode = MODE_COMPRESS;
-
 enum format_type opt_format = FORMAT_AUTO;
+bool opt_auto_adjust = true;
 
 
 /// Stream used to communicate with liblzma
@@ -42,10 +42,6 @@ static size_t filters_count = 0;
 /// Number of the preset (0-9)
 static size_t preset_number = 6;
 
-/// True if we should auto-adjust the compression settings to use less memory
-/// if memory usage limit is too low for the original settings.
-static bool auto_adjust = true;
-
 /// Indicate if no preset has been explicitly given. In that case, if we need
 /// to auto-adjust for lower memory usage, we won't print a warning.
 static bool preset_default = true;
@@ -191,7 +187,7 @@ coder_set_compression_settings(void)
 		// If --no-auto-adjust was used or we didn't find LZMA1 or
 		// LZMA2 as the last filter, give an error immediately.
 		// --format=raw implies --no-auto-adjust.
-		if (!auto_adjust || opt_format == FORMAT_RAW)
+		if (!opt_auto_adjust || opt_format == FORMAT_RAW)
 			memlimit_too_small(memory_usage);
 
 		assert(opt_mode == MODE_COMPRESS);

src/xz/coder.h

@@ -37,6 +37,10 @@ extern enum operation_mode opt_mode;
 /// This is set in args.c.
 extern enum format_type opt_format;
 
+/// If true, the compression settings are automatically adjusted down if
+/// they exceed the memory usage limit.
+extern bool opt_auto_adjust;
+
 
 /// Set the integrity check type used when compressing
 extern void coder_set_check(lzma_check check);

src/xz/message.c

@@ -1137,10 +1137,14 @@ message_help(bool long_help)
 "  -e, --extreme       use more CPU time when encoding to increase compression\n"
 "                      ratio without increasing memory usage of the decoder"));
 
-	if (long_help)
+	if (long_help) {
+		puts(_(
+"      --no-adjust     if compression settings exceed the memory usage limit,\n"
+"                      give an error instead of adjusting the settings downwards"));
 		puts(_( // xgettext:no-c-format
 "  -M, --memory=NUM    use roughly NUM bytes of memory at maximum; 0 indicates\n"
 "                      the default setting, which is 40 % of total RAM"));
+	}
 
 	if (long_help) {
 		puts(_(

src/xz/xz.1

@@ -5,7 +5,7 @@
 .\" This file has been put into the public domain.
 .\" You can do whatever you want with this file.
 .\"
-.TH XZ 1 "2010-06-01" "Tukaani" "XZ Utils"
+.TH XZ 1 "2010-06-15" "Tukaani" "XZ Utils"
 .SH NAME
 xz, unxz, xzcat, lzma, unlzma, lzcat \- Compress or decompress .xz and .lzma files
 .SH SYNOPSIS
@@ -210,7 +210,9 @@ When compressing, if the selected compression settings exceed the memory
 usage limit, the settings are automatically adjusted downwards and a notice
 about this is displayed. As an exception, if the memory usage limit is
 exceeded when compressing with
-.BR \-\-format=raw ,
+.B \-\-format=raw
+or
+.BR \-\-no\-adjust ,
 an error is displayed and
 .B xz
 will exit with exit status
@@ -617,6 +619,13 @@ of the compressor or decompressor (exception: compressor memory usage may
 increase a little with presets \fB\-0\fR ... \fB\-2\fR). The downside is that
 the compression time will increase dramatically (it can easily double).
 .TP
+.B \-\-no\-adjust
+Display an error and exit if the compression settings exceed the
+the memory usage limit. The default is to adjust the settings downwards so
+that the memory usage limit is not exceeded. Automatic adjusting is
+always disabled when creating raw streams
+.RB ( \-\-format=raw ).
+.TP
 \fB\-M\fR \fIlimit\fR, \fB\-\-memory=\fIlimit
 Set the memory usage limit. If this option is specified multiple times,
 the last one takes effect. The