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04ae01a80d
Switch 'compressed_formats[]' to the more modern and flexible designated initializers. This improves readability and allows struct fields to be reordered. Also use a more concise sentinel marker. Remove the curly braces around the for loop while we're at it. No functional changes intended. Link: https://lkml.kernel.org/r/20250910232350.1308206-2-thorsten.blum@linux.dev Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev> Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com> Cc: David Sterba <dsterba@suse.com> Cc: Nick Terrell <terrelln@fb.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* decompress.c
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*
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* Detect the decompression method based on magic number
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*/
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#include <linux/decompress/generic.h>
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#include <linux/decompress/bunzip2.h>
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#include <linux/decompress/unlzma.h>
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#include <linux/decompress/unxz.h>
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#include <linux/decompress/inflate.h>
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#include <linux/decompress/unlzo.h>
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#include <linux/decompress/unlz4.h>
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#include <linux/decompress/unzstd.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/printk.h>
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#ifndef CONFIG_DECOMPRESS_GZIP
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# define gunzip NULL
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#endif
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#ifndef CONFIG_DECOMPRESS_BZIP2
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# define bunzip2 NULL
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#endif
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#ifndef CONFIG_DECOMPRESS_LZMA
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# define unlzma NULL
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#endif
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#ifndef CONFIG_DECOMPRESS_XZ
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# define unxz NULL
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#endif
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#ifndef CONFIG_DECOMPRESS_LZO
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# define unlzo NULL
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#endif
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#ifndef CONFIG_DECOMPRESS_LZ4
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# define unlz4 NULL
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#endif
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#ifndef CONFIG_DECOMPRESS_ZSTD
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# define unzstd NULL
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#endif
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struct compress_format {
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unsigned char magic[2];
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const char *name;
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decompress_fn decompressor;
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};
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static const struct compress_format compressed_formats[] __initconst = {
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{ .magic = {0x1f, 0x8b}, .name = "gzip", .decompressor = gunzip },
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{ .magic = {0x1f, 0x9e}, .name = "gzip", .decompressor = gunzip },
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{ .magic = {0x42, 0x5a}, .name = "bzip2", .decompressor = bunzip2 },
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{ .magic = {0x5d, 0x00}, .name = "lzma", .decompressor = unlzma },
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{ .magic = {0xfd, 0x37}, .name = "xz", .decompressor = unxz },
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{ .magic = {0x89, 0x4c}, .name = "lzo", .decompressor = unlzo },
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{ .magic = {0x02, 0x21}, .name = "lz4", .decompressor = unlz4 },
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{ .magic = {0x28, 0xb5}, .name = "zstd", .decompressor = unzstd },
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{ /* sentinel */ }
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};
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decompress_fn __init decompress_method(const unsigned char *inbuf, long len,
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const char **name)
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{
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const struct compress_format *cf;
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if (len < 2) {
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if (name)
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*name = NULL;
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return NULL; /* Need at least this much... */
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}
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pr_debug("Compressed data magic: %#.2x %#.2x\n", inbuf[0], inbuf[1]);
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for (cf = compressed_formats; cf->name; cf++)
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if (!memcmp(inbuf, cf->magic, 2))
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break;
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if (name)
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*name = cf->name;
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return cf->decompressor;
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}
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