mirror of
https://github.com/json-c/json-c.git
synced 2026-03-28 17:39:07 +08:00
add the disabling formatting coments and adjust the partial code manuly
This commit is contained in:
dota17
354
linkhash.c
354
linkhash.c
@@ -178,15 +178,17 @@ on, and rotates are much kinder to the top and bottom bits, so I used
|
||||
rotates.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
/* clang-format off */
|
||||
#define mix(a,b,c) \
|
||||
{ \
|
||||
a -= c; a ^= rot(c, 4); c += b; \
|
||||
b -= a; b ^= rot(a, 6); a += c; \
|
||||
c -= b; c ^= rot(b, 8); b += a; \
|
||||
a -= c; a ^= rot(c,16); c += b; \
|
||||
b -= a; b ^= rot(a,19); a += c; \
|
||||
c -= b; c ^= rot(b, 4); b += a; \
|
||||
a -= c; a ^= rot(c, 4); c += b; \
|
||||
b -= a; b ^= rot(a, 6); a += c; \
|
||||
c -= b; c ^= rot(b, 8); b += a; \
|
||||
a -= c; a ^= rot(c,16); c += b; \
|
||||
b -= a; b ^= rot(a,19); a += c; \
|
||||
c -= b; c ^= rot(b, 4); b += a; \
|
||||
}
|
||||
/* clang-format on */
|
||||
|
||||
/*
|
||||
-------------------------------------------------------------------------------
|
||||
@@ -213,16 +215,18 @@ and these came close:
|
||||
11 8 15 26 3 22 24
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
/* clang-format off */
|
||||
#define final(a,b,c) \
|
||||
{ \
|
||||
c ^= b; c -= rot(b,14); \
|
||||
a ^= c; a -= rot(c,11); \
|
||||
b ^= a; b -= rot(a,25); \
|
||||
c ^= b; c -= rot(b,16); \
|
||||
a ^= c; a -= rot(c,4); \
|
||||
b ^= a; b -= rot(a,14); \
|
||||
c ^= b; c -= rot(b,24); \
|
||||
c ^= b; c -= rot(b,14); \
|
||||
a ^= c; a -= rot(c,11); \
|
||||
b ^= a; b -= rot(a,25); \
|
||||
c ^= b; c -= rot(b,16); \
|
||||
a ^= c; a -= rot(c,4); \
|
||||
b ^= a; b -= rot(a,14); \
|
||||
c ^= b; c -= rot(b,24); \
|
||||
}
|
||||
/* clang-format on */
|
||||
|
||||
|
||||
/*
|
||||
@@ -252,184 +256,195 @@ acceptable. Do NOT use for cryptographic purposes.
|
||||
-------------------------------------------------------------------------------
|
||||
*/
|
||||
|
||||
static uint32_t hashlittle( const void *key, size_t length, uint32_t initval)
|
||||
/* clang-format off */
|
||||
static uint32_t hashlittle(const void *key, size_t length, uint32_t initval)
|
||||
{
|
||||
uint32_t a,b,c; /* internal state */
|
||||
union { const void *ptr; size_t i; } u; /* needed for Mac Powerbook G4 */
|
||||
uint32_t a,b,c; /* internal state */
|
||||
union
|
||||
{
|
||||
const void *ptr;
|
||||
size_t i;
|
||||
} u; /* needed for Mac Powerbook G4 */
|
||||
|
||||
/* Set up the internal state */
|
||||
a = b = c = 0xdeadbeef + ((uint32_t)length) + initval;
|
||||
/* Set up the internal state */
|
||||
a = b = c = 0xdeadbeef + ((uint32_t)length) + initval;
|
||||
|
||||
u.ptr = key;
|
||||
if (HASH_LITTLE_ENDIAN && ((u.i & 0x3) == 0)) {
|
||||
const uint32_t *k = (const uint32_t *)key; /* read 32-bit chunks */
|
||||
u.ptr = key;
|
||||
if (HASH_LITTLE_ENDIAN && ((u.i & 0x3) == 0)) {
|
||||
const uint32_t *k = (const uint32_t *)key; /* read 32-bit chunks */
|
||||
|
||||
/*------ all but last block: aligned reads and affect 32 bits of (a,b,c) */
|
||||
while (length > 12)
|
||||
{
|
||||
a += k[0];
|
||||
b += k[1];
|
||||
c += k[2];
|
||||
mix(a,b,c);
|
||||
length -= 12;
|
||||
k += 3;
|
||||
}
|
||||
/*------ all but last block: aligned reads and affect 32 bits of (a,b,c) */
|
||||
while (length > 12)
|
||||
{
|
||||
a += k[0];
|
||||
b += k[1];
|
||||
c += k[2];
|
||||
mix(a,b,c);
|
||||
length -= 12;
|
||||
k += 3;
|
||||
}
|
||||
|
||||
/*----------------------------- handle the last (probably partial) block */
|
||||
/*
|
||||
* "k[2]&0xffffff" actually reads beyond the end of the string, but
|
||||
* then masks off the part it's not allowed to read. Because the
|
||||
* string is aligned, the masked-off tail is in the same word as the
|
||||
* rest of the string. Every machine with memory protection I've seen
|
||||
* does it on word boundaries, so is OK with this. But VALGRIND will
|
||||
* still catch it and complain. The masking trick does make the hash
|
||||
* noticably faster for short strings (like English words).
|
||||
* AddressSanitizer is similarly picky about overrunning
|
||||
* the buffer. (http://clang.llvm.org/docs/AddressSanitizer.html
|
||||
*/
|
||||
/*----------------------------- handle the last (probably partial) block */
|
||||
/*
|
||||
* "k[2]&0xffffff" actually reads beyond the end of the string, but
|
||||
* then masks off the part it's not allowed to read. Because the
|
||||
* string is aligned, the masked-off tail is in the same word as the
|
||||
* rest of the string. Every machine with memory protection I've seen
|
||||
* does it on word boundaries, so is OK with this. But VALGRIND will
|
||||
* still catch it and complain. The masking trick does make the hash
|
||||
* noticably faster for short strings (like English words).
|
||||
* AddressSanitizer is similarly picky about overrunning
|
||||
* the buffer. (http://clang.llvm.org/docs/AddressSanitizer.html
|
||||
*/
|
||||
#ifdef VALGRIND
|
||||
# define PRECISE_MEMORY_ACCESS 1
|
||||
#define PRECISE_MEMORY_ACCESS 1
|
||||
#elif defined(__SANITIZE_ADDRESS__) /* GCC's ASAN */
|
||||
# define PRECISE_MEMORY_ACCESS 1
|
||||
#define PRECISE_MEMORY_ACCESS 1
|
||||
#elif defined(__has_feature)
|
||||
# if __has_feature(address_sanitizer) /* Clang's ASAN */
|
||||
# define PRECISE_MEMORY_ACCESS 1
|
||||
# endif
|
||||
#if __has_feature(address_sanitizer) /* Clang's ASAN */
|
||||
#define PRECISE_MEMORY_ACCESS 1
|
||||
#endif
|
||||
#endif
|
||||
#ifndef PRECISE_MEMORY_ACCESS
|
||||
|
||||
switch(length)
|
||||
{
|
||||
case 12: c+=k[2]; b+=k[1]; a+=k[0]; break;
|
||||
case 11: c+=k[2]&0xffffff; b+=k[1]; a+=k[0]; break;
|
||||
case 10: c+=k[2]&0xffff; b+=k[1]; a+=k[0]; break;
|
||||
case 9 : c+=k[2]&0xff; b+=k[1]; a+=k[0]; break;
|
||||
case 8 : b+=k[1]; a+=k[0]; break;
|
||||
case 7 : b+=k[1]&0xffffff; a+=k[0]; break;
|
||||
case 6 : b+=k[1]&0xffff; a+=k[0]; break;
|
||||
case 5 : b+=k[1]&0xff; a+=k[0]; break;
|
||||
case 4 : a+=k[0]; break;
|
||||
case 3 : a+=k[0]&0xffffff; break;
|
||||
case 2 : a+=k[0]&0xffff; break;
|
||||
case 1 : a+=k[0]&0xff; break;
|
||||
case 0 : return c; /* zero length strings require no mixing */
|
||||
}
|
||||
switch(length)
|
||||
{
|
||||
case 12: c+=k[2]; b+=k[1]; a+=k[0]; break;
|
||||
case 11: c+=k[2]&0xffffff; b+=k[1]; a+=k[0]; break;
|
||||
case 10: c+=k[2]&0xffff; b+=k[1]; a+=k[0]; break;
|
||||
case 9 : c+=k[2]&0xff; b+=k[1]; a+=k[0]; break;
|
||||
case 8 : b+=k[1]; a+=k[0]; break;
|
||||
case 7 : b+=k[1]&0xffffff; a+=k[0]; break;
|
||||
case 6 : b+=k[1]&0xffff; a+=k[0]; break;
|
||||
case 5 : b+=k[1]&0xff; a+=k[0]; break;
|
||||
case 4 : a+=k[0]; break;
|
||||
case 3 : a+=k[0]&0xffffff; break;
|
||||
case 2 : a+=k[0]&0xffff; break;
|
||||
case 1 : a+=k[0]&0xff; break;
|
||||
case 0 : return c; /* zero length strings require no mixing */
|
||||
}
|
||||
|
||||
#else /* make valgrind happy */
|
||||
|
||||
const uint8_t *k8 = (const uint8_t *)k;
|
||||
switch(length)
|
||||
{
|
||||
case 12: c+=k[2]; b+=k[1]; a+=k[0]; break;
|
||||
case 11: c+=((uint32_t)k8[10])<<16; /* fall through */
|
||||
case 10: c+=((uint32_t)k8[9])<<8; /* fall through */
|
||||
case 9 : c+=k8[8]; /* fall through */
|
||||
case 8 : b+=k[1]; a+=k[0]; break;
|
||||
case 7 : b+=((uint32_t)k8[6])<<16; /* fall through */
|
||||
case 6 : b+=((uint32_t)k8[5])<<8; /* fall through */
|
||||
case 5 : b+=k8[4]; /* fall through */
|
||||
case 4 : a+=k[0]; break;
|
||||
case 3 : a+=((uint32_t)k8[2])<<16; /* fall through */
|
||||
case 2 : a+=((uint32_t)k8[1])<<8; /* fall through */
|
||||
case 1 : a+=k8[0]; break;
|
||||
case 0 : return c;
|
||||
}
|
||||
const uint8_t *k8 = (const uint8_t *)k;
|
||||
switch(length)
|
||||
{
|
||||
case 12: c+=k[2]; b+=k[1]; a+=k[0]; break;
|
||||
case 11: c+=((uint32_t)k8[10])<<16; /* fall through */
|
||||
case 10: c+=((uint32_t)k8[9])<<8; /* fall through */
|
||||
case 9 : c+=k8[8]; /* fall through */
|
||||
case 8 : b+=k[1]; a+=k[0]; break;
|
||||
case 7 : b+=((uint32_t)k8[6])<<16; /* fall through */
|
||||
case 6 : b+=((uint32_t)k8[5])<<8; /* fall through */
|
||||
case 5 : b+=k8[4]; /* fall through */
|
||||
case 4 : a+=k[0]; break;
|
||||
case 3 : a+=((uint32_t)k8[2])<<16; /* fall through */
|
||||
case 2 : a+=((uint32_t)k8[1])<<8; /* fall through */
|
||||
case 1 : a+=k8[0]; break;
|
||||
case 0 : return c;
|
||||
}
|
||||
|
||||
#endif /* !valgrind */
|
||||
|
||||
} else if (HASH_LITTLE_ENDIAN && ((u.i & 0x1) == 0)) {
|
||||
const uint16_t *k = (const uint16_t *)key; /* read 16-bit chunks */
|
||||
const uint8_t *k8;
|
||||
}
|
||||
else if (HASH_LITTLE_ENDIAN && ((u.i & 0x1) == 0))
|
||||
{
|
||||
const uint16_t *k = (const uint16_t *)key; /* read 16-bit chunks */
|
||||
const uint8_t *k8;
|
||||
|
||||
/*--------------- all but last block: aligned reads and different mixing */
|
||||
while (length > 12)
|
||||
{
|
||||
a += k[0] + (((uint32_t)k[1])<<16);
|
||||
b += k[2] + (((uint32_t)k[3])<<16);
|
||||
c += k[4] + (((uint32_t)k[5])<<16);
|
||||
mix(a,b,c);
|
||||
length -= 12;
|
||||
k += 6;
|
||||
}
|
||||
/*--------------- all but last block: aligned reads and different mixing */
|
||||
while (length > 12)
|
||||
{
|
||||
a += k[0] + (((uint32_t)k[1])<<16);
|
||||
b += k[2] + (((uint32_t)k[3])<<16);
|
||||
c += k[4] + (((uint32_t)k[5])<<16);
|
||||
mix(a,b,c);
|
||||
length -= 12;
|
||||
k += 6;
|
||||
}
|
||||
|
||||
/*----------------------------- handle the last (probably partial) block */
|
||||
k8 = (const uint8_t *)k;
|
||||
switch(length)
|
||||
{
|
||||
case 12: c+=k[4]+(((uint32_t)k[5])<<16);
|
||||
b+=k[2]+(((uint32_t)k[3])<<16);
|
||||
a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 11: c+=((uint32_t)k8[10])<<16; /* fall through */
|
||||
case 10: c+=k[4];
|
||||
b+=k[2]+(((uint32_t)k[3])<<16);
|
||||
a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 9 : c+=k8[8]; /* fall through */
|
||||
case 8 : b+=k[2]+(((uint32_t)k[3])<<16);
|
||||
a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 7 : b+=((uint32_t)k8[6])<<16; /* fall through */
|
||||
case 6 : b+=k[2];
|
||||
a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 5 : b+=k8[4]; /* fall through */
|
||||
case 4 : a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 3 : a+=((uint32_t)k8[2])<<16; /* fall through */
|
||||
case 2 : a+=k[0];
|
||||
break;
|
||||
case 1 : a+=k8[0];
|
||||
break;
|
||||
case 0 : return c; /* zero length requires no mixing */
|
||||
}
|
||||
/*----------------------------- handle the last (probably partial) block */
|
||||
k8 = (const uint8_t *)k;
|
||||
switch(length)
|
||||
{
|
||||
case 12: c+=k[4]+(((uint32_t)k[5])<<16);
|
||||
b+=k[2]+(((uint32_t)k[3])<<16);
|
||||
a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 11: c+=((uint32_t)k8[10])<<16; /* fall through */
|
||||
case 10: c+=k[4];
|
||||
b+=k[2]+(((uint32_t)k[3])<<16);
|
||||
a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 9 : c+=k8[8]; /* fall through */
|
||||
case 8 : b+=k[2]+(((uint32_t)k[3])<<16);
|
||||
a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 7 : b+=((uint32_t)k8[6])<<16; /* fall through */
|
||||
case 6 : b+=k[2];
|
||||
a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 5 : b+=k8[4]; /* fall through */
|
||||
case 4 : a+=k[0]+(((uint32_t)k[1])<<16);
|
||||
break;
|
||||
case 3 : a+=((uint32_t)k8[2])<<16; /* fall through */
|
||||
case 2 : a+=k[0];
|
||||
break;
|
||||
case 1 : a+=k8[0];
|
||||
break;
|
||||
case 0 : return c; /* zero length requires no mixing */
|
||||
}
|
||||
|
||||
} else { /* need to read the key one byte at a time */
|
||||
const uint8_t *k = (const uint8_t *)key;
|
||||
}
|
||||
else
|
||||
{
|
||||
/* need to read the key one byte at a time */
|
||||
const uint8_t *k = (const uint8_t *)key;
|
||||
|
||||
/*--------------- all but the last block: affect some 32 bits of (a,b,c) */
|
||||
while (length > 12)
|
||||
{
|
||||
a += k[0];
|
||||
a += ((uint32_t)k[1])<<8;
|
||||
a += ((uint32_t)k[2])<<16;
|
||||
a += ((uint32_t)k[3])<<24;
|
||||
b += k[4];
|
||||
b += ((uint32_t)k[5])<<8;
|
||||
b += ((uint32_t)k[6])<<16;
|
||||
b += ((uint32_t)k[7])<<24;
|
||||
c += k[8];
|
||||
c += ((uint32_t)k[9])<<8;
|
||||
c += ((uint32_t)k[10])<<16;
|
||||
c += ((uint32_t)k[11])<<24;
|
||||
mix(a,b,c);
|
||||
length -= 12;
|
||||
k += 12;
|
||||
}
|
||||
/*--------------- all but the last block: affect some 32 bits of (a,b,c) */
|
||||
while (length > 12)
|
||||
{
|
||||
a += k[0];
|
||||
a += ((uint32_t)k[1])<<8;
|
||||
a += ((uint32_t)k[2])<<16;
|
||||
a += ((uint32_t)k[3])<<24;
|
||||
b += k[4];
|
||||
b += ((uint32_t)k[5])<<8;
|
||||
b += ((uint32_t)k[6])<<16;
|
||||
b += ((uint32_t)k[7])<<24;
|
||||
c += k[8];
|
||||
c += ((uint32_t)k[9])<<8;
|
||||
c += ((uint32_t)k[10])<<16;
|
||||
c += ((uint32_t)k[11])<<24;
|
||||
mix(a,b,c);
|
||||
length -= 12;
|
||||
k += 12;
|
||||
}
|
||||
|
||||
/*-------------------------------- last block: affect all 32 bits of (c) */
|
||||
switch(length) /* all the case statements fall through */
|
||||
{
|
||||
case 12: c+=((uint32_t)k[11])<<24; /* FALLTHRU */
|
||||
case 11: c+=((uint32_t)k[10])<<16; /* FALLTHRU */
|
||||
case 10: c+=((uint32_t)k[9])<<8; /* FALLTHRU */
|
||||
case 9 : c+=k[8]; /* FALLTHRU */
|
||||
case 8 : b+=((uint32_t)k[7])<<24; /* FALLTHRU */
|
||||
case 7 : b+=((uint32_t)k[6])<<16; /* FALLTHRU */
|
||||
case 6 : b+=((uint32_t)k[5])<<8; /* FALLTHRU */
|
||||
case 5 : b+=k[4]; /* FALLTHRU */
|
||||
case 4 : a+=((uint32_t)k[3])<<24; /* FALLTHRU */
|
||||
case 3 : a+=((uint32_t)k[2])<<16; /* FALLTHRU */
|
||||
case 2 : a+=((uint32_t)k[1])<<8; /* FALLTHRU */
|
||||
case 1 : a+=k[0];
|
||||
break;
|
||||
case 0 : return c;
|
||||
}
|
||||
}
|
||||
/*-------------------------------- last block: affect all 32 bits of (c) */
|
||||
switch(length) /* all the case statements fall through */
|
||||
{
|
||||
case 12: c+=((uint32_t)k[11])<<24; /* FALLTHRU */
|
||||
case 11: c+=((uint32_t)k[10])<<16; /* FALLTHRU */
|
||||
case 10: c+=((uint32_t)k[9])<<8; /* FALLTHRU */
|
||||
case 9 : c+=k[8]; /* FALLTHRU */
|
||||
case 8 : b+=((uint32_t)k[7])<<24; /* FALLTHRU */
|
||||
case 7 : b+=((uint32_t)k[6])<<16; /* FALLTHRU */
|
||||
case 6 : b+=((uint32_t)k[5])<<8; /* FALLTHRU */
|
||||
case 5 : b+=k[4]; /* FALLTHRU */
|
||||
case 4 : a+=((uint32_t)k[3])<<24; /* FALLTHRU */
|
||||
case 3 : a+=((uint32_t)k[2])<<16; /* FALLTHRU */
|
||||
case 2 : a+=((uint32_t)k[1])<<8; /* FALLTHRU */
|
||||
case 1 : a+=k[0];
|
||||
break;
|
||||
case 0 : return c;
|
||||
}
|
||||
}
|
||||
|
||||
final(a,b,c);
|
||||
return c;
|
||||
final(a,b,c);
|
||||
return c;
|
||||
}
|
||||
/* clang-format on */
|
||||
|
||||
/* a simple hash function similiar to what perl does for strings.
|
||||
* for good results, the string should not be excessivly large.
|
||||
@@ -457,7 +472,7 @@ static unsigned long lh_char_hash(const void *k)
|
||||
if (random_seed == -1) {
|
||||
RANDOM_SEED_TYPE seed;
|
||||
/* we can't use -1 as it is the unitialized sentinel */
|
||||
while ((seed = json_c_get_random_seed()) == -1);
|
||||
while ((seed = json_c_get_random_seed()) == -1) {}
|
||||
#if SIZEOF_INT == 8 && defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
|
||||
#define USE_SYNC_COMPARE_AND_SWAP 1
|
||||
#endif
|
||||
@@ -638,7 +653,8 @@ json_bool lh_table_lookup_ex(struct lh_table* t, const void* k, void **v)
|
||||
|
||||
int lh_table_delete_entry(struct lh_table *t, struct lh_entry *e)
|
||||
{
|
||||
ptrdiff_t n = (ptrdiff_t)(e - t->table); /* CAW: fixed to be 64bit nice, still need the crazy negative case... */
|
||||
/* CAW: fixed to be 64bit nice, still need the crazy negative case... */
|
||||
ptrdiff_t n = (ptrdiff_t)(e - t->table);
|
||||
|
||||
/* CAW: this is bad, really bad, maybe stack goes other direction on this machine... */
|
||||
if(n < 0) { return -2; }
|
||||
|
||||
Reference in New Issue
Block a user