xz: Add --ignore-check.
diff --git a/src/xz/args.c b/src/xz/args.c
index d71a23c..041c800 100644
--- a/src/xz/args.c
+++ b/src/xz/args.c
@@ -22,6 +22,7 @@
bool opt_force = false;
bool opt_keep_original = false;
bool opt_robot = false;
+bool opt_ignore_check = false;
// We don't modify or free() this, but we need to assign it in some
// non-const pointers.
@@ -141,6 +142,7 @@
OPT_INFO_MEMORY,
OPT_ROBOT,
OPT_FLUSH_TIMEOUT,
+ OPT_IGNORE_CHECK,
};
static const char short_opts[]
@@ -169,6 +171,7 @@
// Basic compression settings
{ "format", required_argument, NULL, 'F' },
{ "check", required_argument, NULL, 'C' },
+ { "ignore-check", no_argument, NULL, OPT_IGNORE_CHECK },
{ "block-size", required_argument, NULL, OPT_BLOCK_SIZE },
{ "block-list", required_argument, NULL, OPT_BLOCK_LIST },
{ "memlimit-compress", required_argument, NULL, OPT_MEM_COMPRESS },
@@ -438,6 +441,10 @@
break;
}
+ case OPT_IGNORE_CHECK:
+ opt_ignore_check = true;
+ break;
+
case OPT_BLOCK_SIZE:
opt_block_size = str_to_uint64("block-size", optarg,
0, LZMA_VLI_MAX);
diff --git a/src/xz/args.h b/src/xz/args.h
index 53c4a98..1defad1 100644
--- a/src/xz/args.h
+++ b/src/xz/args.h
@@ -36,6 +36,7 @@
extern bool opt_keep_original;
// extern bool opt_recursive;
extern bool opt_robot;
+extern bool opt_ignore_check;
extern const char stdin_filename[];
diff --git a/src/xz/coder.c b/src/xz/coder.c
index 947b472..a94bdb8 100644
--- a/src/xz/coder.c
+++ b/src/xz/coder.c
@@ -450,7 +450,15 @@
break;
}
} else {
- uint32_t flags = LZMA_TELL_UNSUPPORTED_CHECK;
+ uint32_t flags = 0;
+
+ // It seems silly to warn about unsupported check if the
+ // check won't be verified anyway due to --ignore-check.
+ if (opt_ignore_check)
+ flags |= LZMA_IGNORE_CHECK;
+ else
+ flags |= LZMA_TELL_UNSUPPORTED_CHECK;
+
if (!opt_single_stream)
flags |= LZMA_CONCATENATED;
diff --git a/src/xz/message.c b/src/xz/message.c
index c85a2cb..8a31b00 100644
--- a/src/xz/message.c
+++ b/src/xz/message.c
@@ -1122,6 +1122,8 @@
" `auto' (default), `xz', `lzma', and `raw'\n"
" -C, --check=CHECK integrity check type: `none' (use with caution),\n"
" `crc32', `crc64' (default), or `sha256'"));
+ puts(_(
+" --ignore-check don't verify the integrity check when decompressing"));
}
puts(_(
diff --git a/src/xz/xz.1 b/src/xz/xz.1
index 7d7620a..49b0778 100644
--- a/src/xz/xz.1
+++ b/src/xz/xz.1
@@ -609,6 +609,25 @@
headers is always verified with CRC32.
It is not possible to change or disable it.
.TP
+.B \-\-ignore\-check
+Don't verify the integrity check of the compressed data when decompressing.
+The CRC32 values in the
+.B .xz
+headers will still be verified normally.
+.IP ""
+.B "Do not use this option unless you know what you are doing."
+Possible reasons to use this option:
+.RS
+.IP \(bu 3
+Trying to recover data from a corrupt .xz file.
+.IP \(bu 3
+Speeding up decompression.
+This matters mostly with SHA-256 or
+with files that have compressed extremely well.
+It's recommended to not use this option for this purpose
+unless the file integrity is verified externally in some other way.
+.RE
+.TP
.BR \-0 " ... " \-9
Select a compression preset level.
The default is
