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Upgrade LZF to 3.6 (2011) from 3.5 (2009)

Browse Source 
This is lzf_c and lzf_d from
http://dist.schmorp.de/liblzf/liblzf-3.6.tar.gz
This commit is contained in:
Matt Stancliff
2014-12-23 10:10:42 -05:00
parent 25e12d10be
commit 5870e22423
3 changed files with 106 additions and 49 deletions
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57
src/lzf_d.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
* Copyright (c) 2000-2010 Marc Alexander Lehmann <schmorp@schmorp.de>
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
@ -43,14 +43,14 @@
# define SET_ERRNO(n) errno = (n)
#endif
/*
#if USE_REP_MOVSB /* small win on amd, big loss on intel */
#if (__i386 || __amd64) && __GNUC__ >= 3
# define lzf_movsb(dst, src, len) \
asm ("rep movsb" \
: "=D" (dst), "=S" (src), "=c" (len) \
: "0" (dst), "1" (src), "2" (len));
#endif
*/
#endif
unsigned int
lzf_decompress (const void *const in_data, unsigned int in_len,
@ -86,9 +86,17 @@ lzf_decompress (const void *const in_data, unsigned int in_len,
#ifdef lzf_movsb
lzf_movsb (op, ip, ctrl);
#else
do
*op++ = *ip++;
while (--ctrl);
switch (ctrl)
{
case 32: *op++ = *ip++; case 31: *op++ = *ip++; case 30: *op++ = *ip++; case 29: *op++ = *ip++;
case 28: *op++ = *ip++; case 27: *op++ = *ip++; case 26: *op++ = *ip++; case 25: *op++ = *ip++;
case 24: *op++ = *ip++; case 23: *op++ = *ip++; case 22: *op++ = *ip++; case 21: *op++ = *ip++;
case 20: *op++ = *ip++; case 19: *op++ = *ip++; case 18: *op++ = *ip++; case 17: *op++ = *ip++;
case 16: *op++ = *ip++; case 15: *op++ = *ip++; case 14: *op++ = *ip++; case 13: *op++ = *ip++;
case 12: *op++ = *ip++; case 11: *op++ = *ip++; case 10: *op++ = *ip++; case 9: *op++ = *ip++;
case 8: *op++ = *ip++; case 7: *op++ = *ip++; case 6: *op++ = *ip++; case 5: *op++ = *ip++;
case 4: *op++ = *ip++; case 3: *op++ = *ip++; case 2: *op++ = *ip++; case 1: *op++ = *ip++;
}
#endif
}
else /* back reference */
@ -134,12 +142,39 @@ lzf_decompress (const void *const in_data, unsigned int in_len,
len += 2;
lzf_movsb (op, ref, len);
#else
*op++ = *ref++;
*op++ = *ref++;
switch (len)
{
default:
len += 2;
do
*op++ = *ref++;
while (--len);
if (op >= ref + len)
{
/* disjunct areas */
memcpy (op, ref, len);
op += len;
}
else
{
/* overlapping, use octte by octte copying */
do
*op++ = *ref++;
while (--len);
}
break;
case 9: *op++ = *ref++;
case 8: *op++ = *ref++;
case 7: *op++ = *ref++;
case 6: *op++ = *ref++;
case 5: *op++ = *ref++;
case 4: *op++ = *ref++;
case 3: *op++ = *ref++;
case 2: *op++ = *ref++;
case 1: *op++ = *ref++;
case 0: *op++ = *ref++; /* two octets more */
*op++ = *ref++;
}
#endif
}
}