#include "krb5_locl.h"
#include "store-int.h"
typedef struct mem_storage{
unsigned char *base;
size_t size;
unsigned char *ptr;
}mem_storage;
static ssize_t
mem_fetch(krb5_storage *sp, void *data, size_t size)
{
mem_storage *s = (mem_storage*)sp->data;
if(size > (size_t)(s->base + s->size - s->ptr))
size = s->base + s->size - s->ptr;
memmove(data, s->ptr, size);
sp->seek(sp, size, SEEK_CUR);
return size;
}
static ssize_t
mem_store(krb5_storage *sp, const void *data, size_t size)
{
mem_storage *s = (mem_storage*)sp->data;
if(size > (size_t)(s->base + s->size - s->ptr))
size = s->base + s->size - s->ptr;
memmove(s->ptr, data, size);
sp->seek(sp, size, SEEK_CUR);
return size;
}
static ssize_t
mem_no_store(krb5_storage *sp, const void *data, size_t size)
{
return -1;
}
static off_t
mem_seek(krb5_storage *sp, off_t offset, int whence)
{
mem_storage *s = (mem_storage*)sp->data;
switch(whence){
case SEEK_SET:
if((size_t)offset > s->size)
offset = s->size;
if(offset < 0)
offset = 0;
s->ptr = s->base + offset;
break;
case SEEK_CUR:
return sp->seek(sp, s->ptr - s->base + offset, SEEK_SET);
case SEEK_END:
return sp->seek(sp, s->size + offset, SEEK_SET);
default:
errno = EINVAL;
return -1;
}
return s->ptr - s->base;
}
static int
mem_trunc(krb5_storage *sp, off_t offset)
{
mem_storage *s = (mem_storage*)sp->data;
if(offset > SIZE_T_MAX || (size_t)offset > s->size)
return ERANGE;
s->size = (size_t)offset;
if ((s->ptr - s->base) > offset)
s->ptr = s->base + offset;
return 0;
}
static int
mem_no_trunc(krb5_storage *sp, off_t offset)
{
return EINVAL;
}
static void
mem_free(krb5_storage *sp)
{
mem_storage *s = sp->data;
memset(s->base, 0, s->size);
free(s->base);
}
KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
krb5_storage_from_mem(void *buf, size_t len)
{
krb5_storage *sp = malloc(sizeof(krb5_storage));
mem_storage *s;
if(sp == NULL)
return NULL;
s = malloc(sizeof(*s));
if(s == NULL) {
free(sp);
return NULL;
}
sp->data = s;
sp->flags = 0;
sp->eof_code = HEIM_ERR_EOF;
s->base = buf;
s->size = len;
s->ptr = buf;
sp->fetch = mem_fetch;
sp->store = mem_store;
sp->seek = mem_seek;
sp->trunc = mem_trunc;
sp->free = NULL;
sp->max_alloc = UINT_MAX/8;
return sp;
}
KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
krb5_storage_from_data(krb5_data *data)
{
return krb5_storage_from_mem(data->data, data->length);
}
KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
krb5_storage_from_readonly_mem(const void *buf, size_t len)
{
krb5_storage *sp = malloc(sizeof(krb5_storage));
mem_storage *s;
if(sp == NULL)
return NULL;
s = malloc(sizeof(*s));
if(s == NULL) {
free(sp);
return NULL;
}
sp->data = s;
sp->flags = 0;
sp->eof_code = HEIM_ERR_EOF;
s->base = rk_UNCONST(buf);
s->size = len;
s->ptr = rk_UNCONST(buf);
sp->fetch = mem_fetch;
sp->store = mem_no_store;
sp->seek = mem_seek;
sp->trunc = mem_no_trunc;
sp->free = NULL;
sp->max_alloc = UINT_MAX/8;
return sp;
}
krb5_storage * KRB5_LIB_FUNCTION
krb5_storage_from_mem_copy(void *buf, size_t len)
{
krb5_storage *sp = malloc(sizeof(krb5_storage));
mem_storage *s;
if(sp == NULL)
return NULL;
s = malloc(sizeof(*s));
if(s == NULL) {
free(sp);
return NULL;
}
sp->data = s;
sp->flags = 0;
sp->eof_code = HEIM_ERR_EOF;
s->base = malloc(len);
if (s->base == NULL) {
free(sp);
free(s);
return NULL;
}
memcpy(s->base, buf, len);
s->size = len;
s->ptr = s->base;
sp->fetch = mem_fetch;
sp->store = mem_store;
sp->seek = mem_seek;
sp->trunc = mem_trunc;
sp->free = mem_free;
return sp;
}