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ruanhaishen
redis
Commits
598387b9
Commit
598387b9
authored
Mar 09, 2011
by
antirez
Browse files
encoding agnostic intsets
parent
8789dc82
Changes
1
Show whitespace changes
Inline
Side-by-side
src/intset.c
View file @
598387b9
...
...
@@ -3,6 +3,7 @@
#include <string.h>
#include "intset.h"
#include "zmalloc.h"
#include "endian.h"
/* Note that these encodings are ordered, so:
* INTSET_ENC_INT16 < INTSET_ENC_INT32 < INTSET_ENC_INT64. */
...
...
@@ -16,16 +17,29 @@ static uint8_t _intsetValueEncoding(int64_t v) {
return
INTSET_ENC_INT64
;
else
if
(
v
<
INT16_MIN
||
v
>
INT16_MAX
)
return
INTSET_ENC_INT32
;
else
return
INTSET_ENC_INT16
;
}
/* Return the value at pos, given an encoding. */
static
int64_t
_intsetGetEncoded
(
intset
*
is
,
int
pos
,
uint8_t
enc
)
{
if
(
enc
==
INTSET_ENC_INT64
)
return
((
int64_t
*
)
is
->
contents
)[
pos
];
else
if
(
enc
==
INTSET_ENC_INT32
)
return
((
int32_t
*
)
is
->
contents
)[
pos
];
return
((
int16_t
*
)
is
->
contents
)[
pos
];
int64_t
v64
;
int32_t
v32
;
int16_t
v16
;
if
(
enc
==
INTSET_ENC_INT64
)
{
memcpy
(
&
v64
,((
int64_t
*
)
is
->
contents
)
+
pos
,
sizeof
(
v64
));
memrev64ifbe
(
&
v64
);
return
v64
;
}
else
if
(
enc
==
INTSET_ENC_INT32
)
{
memcpy
(
&
v32
,((
int32_t
*
)
is
->
contents
)
+
pos
,
sizeof
(
v32
));
memrev32ifbe
(
&
v32
);
return
v32
;
}
else
{
memcpy
(
&
v16
,((
int16_t
*
)
is
->
contents
)
+
pos
,
sizeof
(
v16
));
memrev16ifbe
(
&
v16
);
return
v16
;
}
}
/* Return the value at pos, using the configured encoding. */
...
...
@@ -35,12 +49,16 @@ static int64_t _intsetGet(intset *is, int pos) {
/* Set the value at pos, using the configured encoding. */
static
void
_intsetSet
(
intset
*
is
,
int
pos
,
int64_t
value
)
{
if
(
is
->
encoding
==
INTSET_ENC_INT64
)
if
(
is
->
encoding
==
INTSET_ENC_INT64
)
{
((
int64_t
*
)
is
->
contents
)[
pos
]
=
value
;
else
if
(
is
->
encoding
==
INTSET_ENC_INT32
)
memrev64ifbe
(((
int64_t
*
)
is
->
contents
)
+
pos
);
}
else
if
(
is
->
encoding
==
INTSET_ENC_INT32
)
{
((
int32_t
*
)
is
->
contents
)[
pos
]
=
value
;
else
memrev32ifbe
(((
int32_t
*
)
is
->
contents
)
+
pos
);
}
else
{
((
int16_t
*
)
is
->
contents
)[
pos
]
=
value
;
memrev16ifbe
(((
int16_t
*
)
is
->
contents
)
+
pos
);
}
}
/* Create an empty intset. */
...
...
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