типы OpenLDAP LBER и функции распределения (OpenLDAP LBER types and allocation functions)
Имя (Name)
ber_int_t, ber_uint_t, ber_len_t, ber_slen_t, ber_tag_t, struct
berval, BerValue, BerVarray, BerElement, ber_bvfree,
ber_bvecfree, ber_bvecadd, ber_bvarray_free, ber_bvarray_add,
ber_bvdup, ber_dupbv, ber_bvstr, ber_bvstrdup, ber_str2bv,
ber_alloc_t, ber_init, ber_init2, ber_free - OpenLDAP LBER types
and allocation functions
Библиотека (Library)
OpenLDAP LBER (liblber, -llber)
Синопсис (Synopsis)
#include <lber.h>
typedef impl_tag_t ber_tag_t;
typedef impl_int_t ber_int_t;
typedef impl_uint_t ber_uint_t;
typedef impl_len_t ber_len_t;
typedef impl_slen_t ber_slen_t;
typedef struct berval {
ber_len_t bv_len;
char *bv_val;
} BerValue, *BerVarray;
typedef struct berelement BerElement;
void ber_bvfree(struct berval *bv);
void ber_bvecfree(struct berval **bvec);
void ber_bvecadd(struct berval ***bvec, struct berval *bv);
void ber_bvarray_free(struct berval *bvarray);
void ber_bvarray_add(BerVarray *bvarray, BerValue *bv);
struct berval *ber_bvdup(const struct berval *bv);
struct berval *ber_dupbv(const struct berval *dst, struct berval
*src);
struct berval *ber_bvstr(const char *str);
struct berval *ber_bvstrdup(const char *str);
struct berval *ber_str2bv(const char *str, ber_len_t len, int
dup, struct berval *bv);
BerElement *ber_alloc_t(int options);
BerElement *ber_init(struct berval *bv);
void ber_init2(BerElement *ber, struct berval *bv, int options);
void ber_free(BerElement *ber, int freebuf);
Описание (Description)
The following are the basic types and structures defined for use
with the Lightweight BER library.
ber_int_t is a signed integer of at least 32 bits. It is
commonly equivalent to int. ber_uint_t is the unsigned variant
of ber_int_t.
ber_len_t is an unsigned integer of at least 32 bits used to
represent a length. It is commonly equivalent to a size_t.
ber_slen_t is the signed variant to ber_len_t.
ber_tag_t is an unsigned integer of at least 32 bits used to
represent a BER tag. It is commonly equivalent to a
unsigned long.
The actual definitions of the integral impl_TYPE_t types are
platform specific.
BerValue, commonly used as struct berval, is used to hold an
arbitrary sequence of octets. bv_val points to bv_len octets.
bv_val is not necessarily terminated by a NULL (zero) octet.
ber_bvfree() frees a BerValue, pointed to by bv, returned from
this API. If bv is NULL, the routine does nothing.
ber_bvecfree() frees an array of BerValues (and the array),
pointed to by bvec, returned from this API. If bvec is NULL, the
routine does nothing. ber_bvecadd() appends the bv pointer to
the bvec array. Space for the array is allocated as needed. The
end of the array is marked by a NULL pointer.
ber_bvarray_free() frees an array of BerValues (and the array),
pointed to by bvarray, returned from this API. If bvarray is
NULL, the routine does nothing. ber_bvarray_add() appends the
contents of the BerValue pointed to by bv to the bvarray array.
Space for the new element is allocated as needed. The end of the
array is marked by a BerValue with a NULL bv_val field.
ber_bvdup() returns a copy of a BerValue. The routine returns
NULL upon error (e.g. out of memory). The caller should use
ber_bvfree() to deallocate the resulting BerValue. ber_dupbv()
copies a BerValue from src to dst. If dst is NULL a new BerValue
will be allocated to hold the copy. The routine returns NULL
upon error, otherwise it returns a pointer to the copy. If dst
is NULL the caller should use ber_bvfree() to deallocate the
resulting BerValue, otherwise ber_memfree() should be used to
deallocate the dst->bv_val. (The ber_bvdup() function is
internally implemented as ber_dupbv(NULL, bv). ber_bvdup() is
provided only for compatibility with an expired draft of the LDAP
C API; ber_dupbv() is the preferred interface.)
ber_bvstr() returns a BerValue containing the string pointed to
by str. ber_bvstrdup() returns a BerValue containing a copy of
the string pointed to by str. ber_str2bv() returns a BerValue
containing the string pointed to by str, whose length may be
optionally specified in len. If dup is non-zero, the BerValue
will contain a copy of str. If len is zero, the number of bytes
to copy will be determined by strlen(3), otherwise len bytes will
be copied. If bv is non-NULL, the result will be stored in the
given BerValue, otherwise a new BerValue will be allocated to
store the result. NOTE: Both ber_bvstr() and ber_bvstrdup() are
implemented as macros using ber_str2bv() in this version of the
library.
BerElement is an opaque structure used to maintain state
information used in encoding and decoding. ber_alloc_t() is used
to create an empty BerElement structure. If LBER_USE_DER is
specified for the options parameter then data lengths for data
written to the BerElement will be encoded in the minimal number
of octets required, otherwise they will always be written as four
byte values. ber_init() creates a BerElement structure that is
initialized with a copy of the data in its bv parameter.
ber_init2() initializes an existing BerElement ber using the data
in the bv parameter. The data is referenced directly, not copied.
The options parameter is the same as for ber_alloc_t().
ber_free() frees a BerElement pointed to by ber. If ber is NULL,
the routine does nothing. If freebuf is zero, the internal
buffer is not freed.
Смотри также (See also)
lber-encode(3), lber-decode(3), lber-memory(3)
