threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* decompress.c
|
|
*
|
|
* Detect the decompression method based on magic number
|
|
*/
|
|
|
|
#include <linux/decompress/generic.h>
|
|
|
|
#include <linux/decompress/bunzip2.h>
|
|
#include <linux/decompress/unlzma.h>
|
|
#include <linux/decompress/unxz.h>
|
|
#include <linux/decompress/inflate.h>
|
|
#include <linux/decompress/unlzo.h>
|
|
#include <linux/decompress/unlz4.h>
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/init.h>
|
|
#include <linux/printk.h>
|
|
|
|
#ifndef CONFIG_DECOMPRESS_GZIP
|
|
# define gunzip NULL
|
|
#endif
|
|
#ifndef CONFIG_DECOMPRESS_BZIP2
|
|
# define bunzip2 NULL
|
|
#endif
|
|
#ifndef CONFIG_DECOMPRESS_LZMA
|
|
# define unlzma NULL
|
|
#endif
|
|
#ifndef CONFIG_DECOMPRESS_XZ
|
|
# define unxz NULL
|
|
#endif
|
|
#ifndef CONFIG_DECOMPRESS_LZO
|
|
# define unlzo NULL
|
|
#endif
|
|
#ifndef CONFIG_DECOMPRESS_LZ4
|
|
# define unlz4 NULL
|
|
#endif
|
|
|
|
struct compress_format {
|
|
unsigned char magic[2];
|
|
const char *name;
|
|
decompress_fn decompressor;
|
|
};
|
|
|
|
static const struct compress_format compressed_formats[] __initconst = {
|
|
{ {0x1f, 0x8b}, "gzip", gunzip },
|
|
{ {0x1f, 0x9e}, "gzip", gunzip },
|
|
{ {0x42, 0x5a}, "bzip2", bunzip2 },
|
|
{ {0x5d, 0x00}, "lzma", unlzma },
|
|
{ {0xfd, 0x37}, "xz", unxz },
|
|
{ {0x89, 0x4c}, "lzo", unlzo },
|
|
{ {0x02, 0x21}, "lz4", unlz4 },
|
|
{ {0, 0}, NULL, NULL }
|
|
};
|
|
|
|
decompress_fn __init decompress_method(const unsigned char *inbuf, long len,
|
|
const char **name)
|
|
{
|
|
const struct compress_format *cf;
|
|
|
|
if (len < 2) {
|
|
if (name)
|
|
*name = NULL;
|
|
return NULL; /* Need at least this much... */
|
|
}
|
|
|
|
pr_debug("Compressed data magic: %#.2x %#.2x\n", inbuf[0], inbuf[1]);
|
|
|
|
for (cf = compressed_formats; cf->name; cf++) {
|
|
if (!memcmp(inbuf, cf->magic, 2))
|
|
break;
|
|
|
|
}
|
|
if (name)
|
|
*name = cf->name;
|
|
return cf->decompressor;
|
|
}
|