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ITS#8117 Fix MDB_INTEGERDUP keysize doc + md_dcmp

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This commit is contained in:
Hallvard Furuseth 2015-05-19 20:33:35 +02:00
parent 329e12e4c5
commit 9bb915675a
2 changed files with 25 additions and 16 deletions
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14
libraries/liblmdb/lmdb.h
View file

@ -303,12 +303,12 @@ typedef void (MDB_rel_func)(MDB_val *item, void *oldptr, void *newptr, void *rel
#define MDB_REVERSEKEY 0x02
/** use sorted duplicates */
#define MDB_DUPSORT 0x04
/** numeric keys in native byte order.
/** numeric keys in native byte order: either unsigned int or size_t.
* The keys must all be of the same size. */
#define MDB_INTEGERKEY 0x08
/** with #MDB_DUPSORT, sorted dup items have fixed size */
#define MDB_DUPFIXED 0x10
/** with #MDB_DUPSORT, dups are numeric in native byte order */
/** with #MDB_DUPSORT, dups are #MDB_INTEGERKEY-style integers */
#define MDB_INTEGERDUP 0x20
/** with #MDB_DUPSORT, use reverse string dups */
#define MDB_REVERSEDUP 0x40
@ -1074,9 +1074,9 @@ int mdb_txn_renew(MDB_txn *txn);
* keys may have multiple data items, stored in sorted order.) By default
* keys must be unique and may have only a single data item.
* <li>#MDB_INTEGERKEY
* Keys are binary integers in native byte order. Setting this option
* requires all keys to be the same size, typically sizeof(int)
* or sizeof(size_t).
* Keys are binary integers in native byte order, either unsigned int
* or size_t, and will be sorted as such.
* The keys must all be of the same size.
* <li>#MDB_DUPFIXED
* This flag may only be used in combination with #MDB_DUPSORT. This option
* tells the library that the data items for this database are all the same
@ -1084,8 +1084,8 @@ int mdb_txn_renew(MDB_txn *txn);
* all data items are the same size, the #MDB_GET_MULTIPLE and #MDB_NEXT_MULTIPLE
* cursor operations may be used to retrieve multiple items at once.
* <li>#MDB_INTEGERDUP
* This option specifies that duplicate data items are also integers, and
* should be sorted as such.
* This option specifies that duplicate data items are binary integers,
* similar to #MDB_INTEGERKEY keys.
* <li>#MDB_REVERSEDUP
* This option specifies that duplicate data items should be compared as
* strings in reverse order.

27
libraries/liblmdb/mdb.c
View file

@ -1328,6 +1328,13 @@ static int mdb_reader_check0(MDB_env *env, int rlocked, int *dead);
static MDB_cmp_func mdb_cmp_memn, mdb_cmp_memnr, mdb_cmp_int, mdb_cmp_cint, mdb_cmp_long;
/** @endcond */
/** Compare two items pointing at size_t's of unknown alignment. */
#ifdef MISALIGNED_OK
# define mdb_cmp_clong mdb_cmp_long
#else
# define mdb_cmp_clong mdb_cmp_cint
#endif
#ifdef _WIN32
static SECURITY_DESCRIPTOR mdb_null_sd;
static SECURITY_ATTRIBUTES mdb_all_sa;
@ -1641,7 +1648,12 @@ mdb_cmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
int
mdb_dcmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
{
return txn->mt_dbxs[dbi].md_dcmp(a, b);
MDB_cmp_func *dcmp = txn->mt_dbxs[dbi].md_dcmp;
#if UINT_MAX < SIZE_MAX
if (dcmp == mdb_cmp_int && a->mv_size == sizeof(size_t))
dcmp = mdb_cmp_clong;
#endif
return dcmp(a, b);
}
/** Allocate memory for a page.
@ -4891,7 +4903,11 @@ mdb_cmp_long(const MDB_val *a, const MDB_val *b)
*(size_t *)a->mv_data > *(size_t *)b->mv_data;
}
/** Compare two items pointing at aligned unsigned int's */
/** Compare two items pointing at aligned unsigned int's.
*
* This is also set as #MDB_INTEGERDUP|#MDB_DUPFIXED's #MDB_dbx.%md_dcmp,
* but #mdb_cmp_clong() is called instead if the data type is size_t.
*/
static int
mdb_cmp_int(const MDB_val *a, const MDB_val *b)
{
@ -4929,13 +4945,6 @@ mdb_cmp_cint(const MDB_val *a, const MDB_val *b)
#endif
}
/** Compare two items pointing at size_t's of unknown alignment. */
#ifdef MISALIGNED_OK
# define mdb_cmp_clong mdb_cmp_long
#else
# define mdb_cmp_clong mdb_cmp_cint
#endif
/** Compare two items lexically */
static int
mdb_cmp_memn(const MDB_val *a, const MDB_val *b)