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authorNick Terrell <terrelln@fb.com>2020-07-30 22:08:35 +0300
committerIngo Molnar <mingo@kernel.org>2020-07-31 12:49:08 +0300
commit4963bb2b89884bbdb7e33e6a09c159551e9627aa (patch)
tree503649537075d61fddbfec3f73736d57e5c33a2e /include/linux/decompress
parent6d25a633ea68a103c7293d16eb69a7d4689075ad (diff)
downloadlinux-4963bb2b89884bbdb7e33e6a09c159551e9627aa.tar.xz
lib: Add zstd support to decompress
- Add unzstd() and the zstd decompress interface. - Add zstd support to decompress_method(). The decompress_method() and unzstd() functions are used to decompress the initramfs and the initrd. The __decompress() function is used in the preboot environment to decompress a zstd compressed kernel. The zstd decompression function allows the input and output buffers to overlap because that is used by x86 kernel decompression. Signed-off-by: Nick Terrell <terrelln@fb.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20200730190841.2071656-3-nickrterrell@gmail.com
Diffstat (limited to 'include/linux/decompress')
-rw-r--r--include/linux/decompress/unzstd.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/decompress/unzstd.h b/include/linux/decompress/unzstd.h
new file mode 100644
index 000000000000..56d539ae880f
--- /dev/null
+++ b/include/linux/decompress/unzstd.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LINUX_DECOMPRESS_UNZSTD_H
+#define LINUX_DECOMPRESS_UNZSTD_H
+
+int unzstd(unsigned char *inbuf, long len,
+ long (*fill)(void*, unsigned long),
+ long (*flush)(void*, unsigned long),
+ unsigned char *output,
+ long *pos,
+ void (*error_fn)(char *x));
+#endif