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ruanhaishen
redis
Commits
75d8978e
Commit
75d8978e
authored
May 22, 2010
by
Pieter Noordhuis
Browse files
updated iteration code to work well with different encodings
parent
37fff074
Changes
1
Hide whitespace changes
Inline
Side-by-side
ziplist.c
View file @
75d8978e
...
...
@@ -296,18 +296,31 @@ unsigned char *ziplistIndex(unsigned char *zl, unsigned int index) {
return
p
;
}
/* Store entry at current position in sds *value and return pointer
* to the next entry. */
unsigned
char
*
ziplistNext
(
unsigned
char
*
p
,
unsigned
char
**
q
,
unsigned
char
**
entry
,
unsigned
int
*
elen
)
{
unsigned
int
lensize
;
if
(
*
p
==
ZIP_END
)
return
NULL
;
if
(
entry
)
{
*
elen
=
zipDecodeLength
(
p
,
&
lensize
);
*
entry
=
p
+
lensize
;
/* Return pointer to next entry in ziplist. */
unsigned
char
*
ziplistNext
(
unsigned
char
*
p
)
{
return
*
p
==
ZIP_END
?
p
:
p
+
zipRawEntryLength
(
p
);
}
/* Get entry pointer to by 'p' and store in either 'e' or 'v' depending
* on the encoding of the entry. 'e' is always set to NULL to be able
* to find out whether the string pointer or the integer value was set.
* Return 0 if 'p' points to the end of the zipmap, 1 otherwise. */
unsigned
int
ziplistGet
(
unsigned
char
*
p
,
unsigned
char
**
e
,
unsigned
int
*
elen
,
long
long
*
v
)
{
unsigned
int
len
,
lensize
;
if
(
*
p
==
ZIP_END
)
return
0
;
if
(
e
)
*
e
=
NULL
;
len
=
zipDecodeLength
(
p
,
&
lensize
);
if
(
ZIP_ENCODING
(
p
)
==
ZIP_ENC_RAW
)
{
if
(
e
)
{
*
elen
=
len
;
*
e
=
p
+
lensize
;
}
}
else
{
if
(
v
)
{
*
v
=
zipLoadInteger
(
p
+
lensize
,
ZIP_ENCODING
(
p
));
}
}
if
(
q
!=
NULL
)
*
q
=
p
;
p
+=
zipRawEntryLength
(
p
);
return
p
;
return
1
;
}
/* Delete a range of entries from the ziplist. */
...
...
@@ -382,6 +395,7 @@ unsigned char *createList() {
zl
=
ziplistPush
(
zl
,
(
unsigned
char
*
)
"foo"
,
3
,
ZIPLIST_TAIL
);
zl
=
ziplistPush
(
zl
,
(
unsigned
char
*
)
"quux"
,
4
,
ZIPLIST_TAIL
);
zl
=
ziplistPush
(
zl
,
(
unsigned
char
*
)
"hello"
,
5
,
ZIPLIST_HEAD
);
zl
=
ziplistPush
(
zl
,
(
unsigned
char
*
)
"1024"
,
4
,
ZIPLIST_TAIL
);
return
zl
;
}
...
...
@@ -407,6 +421,7 @@ unsigned char *createIntList() {
int
main
(
int
argc
,
char
**
argv
)
{
unsigned
char
*
zl
,
*
p
,
*
q
,
*
entry
;
unsigned
int
elen
;
long
long
value
;
sds
s
;
zl
=
createIntList
();
...
...
@@ -427,10 +442,15 @@ int main(int argc, char **argv) {
{
zl
=
createList
();
p
=
ziplistIndex
(
zl
,
0
);
while
(
(
p
=
ziplist
Nex
t
(
p
,
NULL
,
&
entry
,
&
elen
))
!=
NULL
)
{
while
(
ziplist
Ge
t
(
p
,
&
entry
,
&
elen
,
&
value
)
)
{
printf
(
"Entry: "
);
fwrite
(
entry
,
elen
,
1
,
stdout
);
printf
(
" (length %d)
\n
"
,
elen
);
if
(
entry
)
{
fwrite
(
entry
,
elen
,
1
,
stdout
);
}
else
{
printf
(
"%lld"
,
value
);
}
p
=
ziplistNext
(
p
);
printf
(
"
\n
"
);
}
printf
(
"
\n
"
);
}
...
...
@@ -439,10 +459,15 @@ int main(int argc, char **argv) {
{
zl
=
createList
();
p
=
ziplistIndex
(
zl
,
1
);
while
(
(
p
=
ziplist
Nex
t
(
p
,
NULL
,
&
entry
,
&
elen
))
!=
NULL
)
{
while
(
ziplist
Ge
t
(
p
,
&
entry
,
&
elen
,
&
value
)
)
{
printf
(
"Entry: "
);
fwrite
(
entry
,
elen
,
1
,
stdout
);
printf
(
" (length %d)
\n
"
,
elen
);
if
(
entry
)
{
fwrite
(
entry
,
elen
,
1
,
stdout
);
}
else
{
printf
(
"%lld"
,
value
);
}
p
=
ziplistNext
(
p
);
printf
(
"
\n
"
);
}
printf
(
"
\n
"
);
}
...
...
@@ -451,10 +476,15 @@ int main(int argc, char **argv) {
{
zl
=
createList
();
p
=
ziplistIndex
(
zl
,
2
);
while
(
(
p
=
ziplist
Nex
t
(
p
,
NULL
,
&
entry
,
&
elen
))
!=
NULL
)
{
while
(
ziplist
Ge
t
(
p
,
&
entry
,
&
elen
,
&
value
)
)
{
printf
(
"Entry: "
);
fwrite
(
entry
,
elen
,
1
,
stdout
);
printf
(
" (length %d)
\n
"
,
elen
);
if
(
entry
)
{
fwrite
(
entry
,
elen
,
1
,
stdout
);
}
else
{
printf
(
"%lld"
,
value
);
}
p
=
ziplistNext
(
p
);
printf
(
"
\n
"
);
}
printf
(
"
\n
"
);
}
...
...
@@ -462,8 +492,8 @@ int main(int argc, char **argv) {
printf
(
"Iterate starting out of range:
\n
"
);
{
zl
=
createList
();
p
=
ziplistIndex
(
zl
,
3
);
if
(
ziplist
Nex
t
(
p
,
&
entry
,
NULL
,
&
elen
)
==
NULL
)
{
p
=
ziplistIndex
(
zl
,
4
);
if
(
!
ziplist
Ge
t
(
p
,
&
entry
,
&
elen
,
&
value
)
)
{
printf
(
"No entry
\n
"
);
}
else
{
printf
(
"ERROR
\n
"
);
...
...
@@ -510,15 +540,19 @@ int main(int argc, char **argv) {
{
zl
=
createList
();
p
=
ziplistIndex
(
zl
,
0
);
while
(
(
p
=
ziplist
Nex
t
(
p
,
&
q
,
&
entry
,
&
elen
))
!=
NULL
)
{
if
(
strncmp
(
"foo"
,
entry
,
elen
)
==
0
)
{
while
(
ziplist
Ge
t
(
p
,
&
entry
,
&
elen
,
&
value
)
)
{
if
(
entry
&&
strncmp
(
"foo"
,
entry
,
elen
)
==
0
)
{
printf
(
"Delete foo
\n
"
);
zl
=
ziplistDelete
(
zl
,
&
q
);
p
=
q
;
zl
=
ziplistDelete
(
zl
,
&
p
);
}
else
{
printf
(
"Entry: "
);
fwrite
(
entry
,
elen
,
1
,
stdout
);
printf
(
" (length %d)
\n
"
,
elen
);
if
(
entry
)
{
fwrite
(
entry
,
elen
,
1
,
stdout
);
}
else
{
printf
(
"%lld"
,
value
);
}
p
=
ziplistNext
(
p
);
printf
(
"
\n
"
);
}
}
printf
(
"
\n
"
);
...
...
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