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bzip2/lzma: centralize format detection

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Centralize the compression format detection to a common routine in the
lib directory, and use it for both initramfs and initrd.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin
2009-01-08 15:14:17 -08:00
parent 6c11b12ac6
commit 889c92d21d
5 changed files with 72 additions and 67 deletions
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39
init/initramfs.c
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@@ -416,13 +416,13 @@ static int __init flush_buffer(void *bufv, unsigned len)
static unsigned my_inptr; /* index of next byte to be processed in inbuf */
#include <linux/decompress/bunzip2.h>
#include <linux/decompress/unlzma.h>
#include <linux/decompress/inflate.h>
#include <linux/decompress/generic.h>
static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
{
int written;
decompress_fn decompress;
dry_run = check_only;
header_buf = kmalloc(110, GFP_KERNEL);
symlink_buf = kmalloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1, GFP_KERNEL);
@@ -450,35 +450,10 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
continue;
}
this_header = 0;
#ifdef CONFIG_RD_GZIP
if (!gunzip(buf, len, NULL, flush_buffer, NULL,
&my_inptr, error) &&
message == NULL)
goto ok;
#endif
#ifdef CONFIG_RD_BZIP2
message = NULL; /* Zero out message, or else cpio will
think an error has already occured */
if (!bunzip2(buf, len, NULL, flush_buffer, NULL,
&my_inptr, error) &&
message == NULL) {
goto ok;
}
#endif
#ifdef CONFIG_RD_LZMA
message = NULL; /* Zero out message, or else cpio will
think an error has already occured */
if (!unlzma(buf, len, NULL, flush_buffer, NULL,
&my_inptr, error) &&
message == NULL) {
goto ok;
}
#endif
#if defined CONFIG_RD_GZIP || defined CONFIG_RD_BZIP2 || defined CONFIG_RD_LZMA
ok:
#endif
decompress = decompress_method(buf, len, NULL);
if (decompress)
decompress(buf, len, NULL, flush_buffer, NULL,
&my_inptr, error);
if (state != Reset)
error("junk in compressed archive");
this_header = saved_offset + my_inptr;