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lib/lzo: separate lzo-rle from lzo

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To prevent any issues with persistent data, separate lzo-rle from lzo so
that it is treated as a separate algorithm, and lzo is still available.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Dave Rodgman <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Markus F.X.J. Oberhumer <[email protected]>
Cc: Matt Sealey <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Nitin Gupta <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Sonny Rao <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dave Rodgman 2019-03-07 16:30:44 -08:00 • committed by Linus Torvalds
commit 45ec975efb
8 changed files with 226 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

42
lib/lzo/lzo1x_compress.c
View file

@ -20,7 +20,8 @@
static noinline size_t
lzo1x_1_do_compress(const unsigned char *in, size_t in_len,
unsigned char *out, size_t *out_len,
size_t ti, void *wrkmem, signed char *state_offset)
size_t ti, void *wrkmem, signed char *state_offset,
const unsigned char bitstream_version)
{
const unsigned char *ip;
unsigned char *op;
@ -46,7 +47,7 @@ next:
break;
dv = get_unaligned_le32(ip);
if (dv == 0) {
if (dv == 0 && bitstream_version) {
const unsigned char *ir = ip + 4;
const unsigned char *limit = ip_end
< (ip + MAX_ZERO_RUN_LENGTH + 1)
@ -284,30 +285,36 @@ finished_writing_instruction:
return in_end - (ii - ti);
}
int lzo1x_1_compress(const unsigned char *in, size_t in_len,
int lzogeneric1x_1_compress(const unsigned char *in, size_t in_len,
unsigned char *out, size_t *out_len,
void *wrkmem)
void *wrkmem, const unsigned char bitstream_version)
{
const unsigned char *ip = in;
unsigned char *op = out;
size_t l = in_len;
size_t t = 0;
signed char state_offset = -2;
unsigned int m4_max_offset;
// LZO v0 will never write 17 as first byte,
// so this is used to version the bitstream
*op++ = 17;
*op++ = LZO_VERSION;
if (bitstream_version > 0) {
*op++ = 17;
*op++ = bitstream_version;
m4_max_offset = M4_MAX_OFFSET_V1;
} else {
m4_max_offset = M4_MAX_OFFSET_V0;
}
while (l > 20) {
size_t ll = l <= (M4_MAX_OFFSET + 1) ? l : (M4_MAX_OFFSET + 1);
size_t ll = l <= (m4_max_offset + 1) ? l : (m4_max_offset + 1);
uintptr_t ll_end = (uintptr_t) ip + ll;
if ((ll_end + ((t + ll) >> 5)) <= ll_end)
break;
BUILD_BUG_ON(D_SIZE * sizeof(lzo_dict_t) > LZO1X_1_MEM_COMPRESS);
memset(wrkmem, 0, D_SIZE * sizeof(lzo_dict_t));
t = lzo1x_1_do_compress(ip, ll, op, out_len,
t, wrkmem, &state_offset);
t = lzo1x_1_do_compress(ip, ll, op, out_len, t, wrkmem,
&state_offset, bitstream_version);
ip += ll;
op += *out_len;
l -= ll;
@ -351,7 +358,24 @@ int lzo1x_1_compress(const unsigned char *in, size_t in_len,
*out_len = op - out;
return LZO_E_OK;
}
int lzo1x_1_compress(const unsigned char *in, size_t in_len,
unsigned char *out, size_t *out_len,
void *wrkmem)
{
return lzogeneric1x_1_compress(in, in_len, out, out_len, wrkmem, 0);
}
int lzorle1x_1_compress(const unsigned char *in, size_t in_len,
unsigned char *out, size_t *out_len,
void *wrkmem)
{
return lzogeneric1x_1_compress(in, in_len, out, out_len,
wrkmem, LZO_VERSION);
}
EXPORT_SYMBOL_GPL(lzo1x_1_compress);
EXPORT_SYMBOL_GPL(lzorle1x_1_compress);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZO1X-1 Compressor");

3
lib/lzo/lzodefs.h
View file

@ -44,7 +44,8 @@
#define M1_MAX_OFFSET 0x0400
#define M2_MAX_OFFSET 0x0800
#define M3_MAX_OFFSET 0x4000
#define M4_MAX_OFFSET 0xbffe
#define M4_MAX_OFFSET_V0 0xbfff
#define M4_MAX_OFFSET_V1 0xbffe
#define M1_MIN_LEN 2
#define M1_MAX_LEN 2