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More robust HLL_SPARSE macros protecting 'p' with parens.

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Now the macros will work with arguments such as "ptr+1".
This commit is contained in:
antirez 2014-04-14 11:49:53 +02:00
parent 142d133c8a
commit 837ca39081
1 changed files with 8 additions and 8 deletions
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16
src/hyperloglog.c
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@ -361,13 +361,13 @@ struct hllhdr {
* The macros parameter is expected to be an uint8_t pointer. */
#define HLL_SPARSE_XZERO_BIT 0x40 /* 01xxxxxx */
#define HLL_SPARSE_VAL_BIT 0x80 /* 1vvvvvxx */
#define HLL_SPARSE_IS_ZERO(p) (((*p) & 0xc0) == 0) /* 00xxxxxx */
#define HLL_SPARSE_IS_XZERO(p) (((*p) & 0xc0) == HLL_SPARSE_XZERO_BIT)
#define HLL_SPARSE_IS_VAL(p) ((*p) & HLL_SPARSE_VAL_BIT)
#define HLL_SPARSE_ZERO_LEN(p) (((*p) & 0x3f)+1)
#define HLL_SPARSE_XZERO_LEN(p) (((((*p) & 0x3f) << 8) | (*(p+1)))+1)
#define HLL_SPARSE_VAL_VALUE(p) ((((*p) >> 2) & 0x1f)+1)
#define HLL_SPARSE_VAL_LEN(p) (((*p) & 0x3)+1)
#define HLL_SPARSE_IS_ZERO(p) (((*(p)) & 0xc0) == 0) /* 00xxxxxx */
#define HLL_SPARSE_IS_XZERO(p) (((*(p)) & 0xc0) == HLL_SPARSE_XZERO_BIT)
#define HLL_SPARSE_IS_VAL(p) ((*(p)) & HLL_SPARSE_VAL_BIT)
#define HLL_SPARSE_ZERO_LEN(p) (((*(p)) & 0x3f)+1)
#define HLL_SPARSE_XZERO_LEN(p) (((((*(p)) & 0x3f) << 8) | (*((p)+1)))+1)
#define HLL_SPARSE_VAL_VALUE(p) ((((*(p)) >> 2) & 0x1f)+1)
#define HLL_SPARSE_VAL_LEN(p) (((*(p)) & 0x3)+1)
#define HLL_SPARSE_VAL_MAX_VALUE 32
#define HLL_SPARSE_VAL_MAX_LEN 4
#define HLL_SPARSE_ZERO_MAX_LEN 64
@ -381,7 +381,7 @@ struct hllhdr {
#define HLL_SPARSE_XZERO_SET(p,len) do { \
int _l = (len)-1; \
*(p) = (_l>>8) | HLL_SPARSE_XZERO_BIT; \
*(p+1) = (_l&0xff); \
*((p)+1) = (_l&0xff); \
} while(0)
/* ========================= HyperLogLog algorithm ========================= */