source: trunk/sys/libcrypto/others/o_names.c @ 50

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/err.h>
#include <openssl/lhash.h>
#include <openssl/objects.h>
#include <openssl/safestack.h>
#include <openssl/e_os2.h>

/* Later versions of DEC C has started to add lnkage information to certain
 * functions, which makes it tricky to use them as values to regular function
 * pointers.  One way is to define a macro that takes care of casting them
 * correctly.
 */
#ifdef OPENSSL_SYS_VMS_DECC
# define OPENSSL_strcmp (int (*)(const char *,const char *))strcmp
#else
# define OPENSSL_strcmp strcmp
#endif

/* I use the ex_data stuff to manage the identifiers for the obj_name_types
 * that applications may define.  I only really use the free function field.
 */
static LHASH *names_lh=NULL;
static int names_type_num=OBJ_NAME_TYPE_NUM;

typedef struct name_funcs_st
        {
        unsigned long (*hash_func)(const char *name);
        int (*cmp_func)(const char *a,const char *b);
        void (*free_func)(const char *, int, const char *);
        } NAME_FUNCS;

DECLARE_STACK_OF(NAME_FUNCS)
IMPLEMENT_STACK_OF(NAME_FUNCS)

static STACK_OF(NAME_FUNCS) *name_funcs_stack;

/* The LHASH callbacks now use the raw "void *" prototypes and do per-variable
 * casting in the functions. This prevents function pointer casting without the
 * need for macro-generated wrapper functions. */

/* static unsigned long obj_name_hash(OBJ_NAME *a); */
static unsigned long obj_name_hash(const void *a_void);
/* static int obj_name_cmp(OBJ_NAME *a,OBJ_NAME *b); */
static int obj_name_cmp(const void *a_void,const void *b_void);

int OBJ_NAME_init(void)
        {
        if (names_lh != NULL) return(1);
        MemCheck_off();
        names_lh=lh_new(obj_name_hash, obj_name_cmp);
        MemCheck_on();
        return(names_lh != NULL);
        }

int OBJ_NAME_new_index(unsigned long (*hash_func)(const char *),
        int (*cmp_func)(const char *, const char *),
        void (*free_func)(const char *, int, const char *))
        {
        int ret;
        int i;
        NAME_FUNCS *name_funcs;

        if (name_funcs_stack == NULL)
                {
                MemCheck_off();
                name_funcs_stack=sk_NAME_FUNCS_new_null();
                MemCheck_on();
                }
        if ((name_funcs_stack == NULL))
                {
                /* ERROR */
                return(0);
                }
        ret=names_type_num;
        names_type_num++;
        for (i=sk_NAME_FUNCS_num(name_funcs_stack); i<names_type_num; i++)
                {
                MemCheck_off();
                name_funcs = OPENSSL_malloc(sizeof(NAME_FUNCS));
                MemCheck_on();
                if (!name_funcs)
                        {
                        OBJerr(OBJ_F_OBJ_NAME_NEW_INDEX,ERR_R_MALLOC_FAILURE);
                        return(0);
                        }
                name_funcs->hash_func = lh_strhash;
                name_funcs->cmp_func = OPENSSL_strcmp;
                name_funcs->free_func = 0; /* NULL is often declared to
                                                * ((void *)0), which according
                                                * to Compaq C is not really
                                                * compatible with a function
                                                * pointer.      -- Richard Levitte*/
                MemCheck_off();
                sk_NAME_FUNCS_push(name_funcs_stack,name_funcs);
                MemCheck_on();
                }
        name_funcs = sk_NAME_FUNCS_value(name_funcs_stack, ret);
        if (hash_func != NULL)
                name_funcs->hash_func = hash_func;
        if (cmp_func != NULL)
                name_funcs->cmp_func = cmp_func;
        if (free_func != NULL)
                name_funcs->free_func = free_func;
        return(ret);
        }

/* static int obj_name_cmp(OBJ_NAME *a, OBJ_NAME *b) */
static int obj_name_cmp(const void *a_void, const void *b_void)
        {
        int ret;
        const OBJ_NAME *a = (const OBJ_NAME *)a_void;
        const OBJ_NAME *b = (const OBJ_NAME *)b_void;

        ret=a->type-b->type;
        if (ret == 0)
                {
                if ((name_funcs_stack != NULL)
                        && (sk_NAME_FUNCS_num(name_funcs_stack) > a->type))
                        {
                        ret=sk_NAME_FUNCS_value(name_funcs_stack,
                                a->type)->cmp_func(a->name,b->name);
                        }
                else
                        ret=strcmp(a->name,b->name);
                }
        return(ret);
        }

/* static unsigned long obj_name_hash(OBJ_NAME *a) */
static unsigned long obj_name_hash(const void *a_void)
        {
        unsigned long ret;
        const OBJ_NAME *a = (const OBJ_NAME *)a_void;

        if ((name_funcs_stack != NULL) && (sk_NAME_FUNCS_num(name_funcs_stack) > a->type))
                {
                ret=sk_NAME_FUNCS_value(name_funcs_stack,
                        a->type)->hash_func(a->name);
                }
        else
                {
                ret=lh_strhash(a->name);
                }
        ret^=a->type;
        return(ret);
        }

const char *OBJ_NAME_get(const char *name, int type)
        {
        OBJ_NAME on,*ret;
        int num=0,alias;

        if (name == NULL) return(NULL);
        if ((names_lh == NULL) && !OBJ_NAME_init()) return(NULL);

        alias=type&OBJ_NAME_ALIAS;
        type&= ~OBJ_NAME_ALIAS;

        on.name=name;
        on.type=type;

        for (;;)
        {
                ret=(OBJ_NAME *)lh_retrieve(names_lh,&on);
                if (ret == NULL) return(NULL);
                if ((ret->alias) && !alias)
                        {
                        if (++num > 10) return(NULL);
                        on.name=ret->data;
                        }
                else
                        {
                        return(ret->data);
                        }
                }
        }

int OBJ_NAME_add(const char *name, int type, const char *data)
        {
        OBJ_NAME *onp,*ret;
        int alias;

        if ((names_lh == NULL) && !OBJ_NAME_init()) return(0);

        alias=type&OBJ_NAME_ALIAS;
        type&= ~OBJ_NAME_ALIAS;

        onp=(OBJ_NAME *)OPENSSL_malloc(sizeof(OBJ_NAME));
        if (onp == NULL)
                {
                /* ERROR */
                return(0);
                }

        onp->name=name;
        onp->alias=alias;
        onp->type=type;
        onp->data=data;

        ret=(OBJ_NAME *)lh_insert(names_lh,onp);
        if (ret != NULL)
                {
                /* free things */
                if ((name_funcs_stack != NULL) && (sk_NAME_FUNCS_num(name_funcs_stack) > ret->type))
                        {
                        /* XXX: I'm not sure I understand why the free
                         * function should get three arguments...
                         * -- Richard Levitte
                         */
                        sk_NAME_FUNCS_value(name_funcs_stack,
                                ret->type)->free_func(ret->name,ret->type,ret->data);
                        }
                OPENSSL_free(ret);
                }
        else
                {
                if (lh_error(names_lh))
                        {
                        /* ERROR */
                        return(0);
                        }
                }
        return(1);
        }

int OBJ_NAME_remove(const char *name, int type)
        {
        OBJ_NAME on,*ret;

        if (names_lh == NULL) return(0);

        type&= ~OBJ_NAME_ALIAS;
        on.name=name;
        on.type=type;
        ret=(OBJ_NAME *)lh_delete(names_lh,&on);
        if (ret != NULL)
                {
                /* free things */
                if ((name_funcs_stack != NULL) && (sk_NAME_FUNCS_num(name_funcs_stack) > ret->type))
                        {
                        /* XXX: I'm not sure I understand why the free
                         * function should get three arguments...
                         * -- Richard Levitte
                         */
                        sk_NAME_FUNCS_value(name_funcs_stack,
                                ret->type)->free_func(ret->name,ret->type,ret->data);
                        }
                OPENSSL_free(ret);
                return(1);
                }
        else
                return(0);
        }

struct doall
        {
        int type;
        void (*fn)(const OBJ_NAME *,void *arg);
        void *arg;
        };

static void do_all_fn(const OBJ_NAME *name,struct doall *d)
        {
        if(name->type == d->type)
                d->fn(name,d->arg);
        }

static IMPLEMENT_LHASH_DOALL_ARG_FN(do_all_fn, const OBJ_NAME *, struct doall *)

void OBJ_NAME_do_all(int type,void (*fn)(const OBJ_NAME *,void *arg),void *arg)
        {
        struct doall d;

        d.type=type;
        d.fn=fn;
        d.arg=arg;

        lh_doall_arg(names_lh,LHASH_DOALL_ARG_FN(do_all_fn),&d);
        }

struct doall_sorted
        {
        int type;
        int n;
        const OBJ_NAME **names;
        };

static void do_all_sorted_fn(const OBJ_NAME *name,void *d_)
        {
        struct doall_sorted *d=d_;

        if(name->type != d->type)
                return;

        d->names[d->n++]=name;
        }

static int do_all_sorted_cmp(const void *n1_,const void *n2_)
        {
        const OBJ_NAME * const *n1=n1_;
        const OBJ_NAME * const *n2=n2_;

        return strcmp((*n1)->name,(*n2)->name);
        }

void OBJ_NAME_do_all_sorted(int type,void (*fn)(const OBJ_NAME *,void *arg),
                                void *arg)
        {
        struct doall_sorted d;
        int n;

        d.type=type;
        d.names=OPENSSL_malloc(lh_num_items(names_lh)*sizeof *d.names);
        d.n=0;
        OBJ_NAME_do_all(type,do_all_sorted_fn,&d);

        qsort((void *)d.names,d.n,sizeof *d.names,do_all_sorted_cmp);

        for(n=0 ; n < d.n ; ++n)
                fn(d.names[n],arg);

        OPENSSL_free((void *)d.names);
        }

static int free_type;

static void names_lh_free(OBJ_NAME *onp)
{
        if(onp == NULL)
                return;

        if ((free_type < 0) || (free_type == onp->type))
                {
                OBJ_NAME_remove(onp->name,onp->type);
                }
        }

static IMPLEMENT_LHASH_DOALL_FN(names_lh_free, OBJ_NAME *)

static void name_funcs_free(NAME_FUNCS *ptr)
        {
        OPENSSL_free(ptr);
        }

void OBJ_NAME_cleanup(int type)
        {
        unsigned long down_load;

        if (names_lh == NULL) return;

        free_type=type;
        down_load=names_lh->down_load;
        names_lh->down_load=0;

        lh_doall(names_lh,LHASH_DOALL_FN(names_lh_free));
        if (type < 0)
                {
                lh_free(names_lh);
                sk_NAME_FUNCS_pop_free(name_funcs_stack,name_funcs_free);
                names_lh=NULL;
                name_funcs_stack = NULL;
                }
        else
                names_lh->down_load=down_load;
        }