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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2001-2009. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#include <string.h>
#include <stdlib.h>
#include "eidef.h"
#include "eiext.h"
#include "ei_malloc.h"
#include "decode_skip.h"
#include "putget.h"
int ei_decode_fun(const char *buf, int *index, erlang_fun *p)
{
const char *s = buf + *index;
const char *s0 = s;
int i, ix, ix0, n;
switch (get8(s)) {
case ERL_FUN_EXT:
/* mark as old (R7 and older) external fun */
if (p != NULL) p->arity = -1;
/* first number of free vars (environment) */
n = get32be(s);
/* then the pid */
ix = 0;
if (ei_decode_pid(s, &ix, (p == NULL ? (erlang_pid*)NULL : &p->pid)) < 0)
return -1;
/* then the module (atom) */
if (ei_decode_atom(s, &ix, (p == NULL ? (char*)NULL : p->module)) < 0)
return -1;
/* then the index */
if (ei_decode_long(s, &ix, (p == NULL ? (long*)NULL : &p->index)) < 0)
return -1;
/* then the uniq */
if (ei_decode_long(s, &ix, (p == NULL ? (long*)NULL : &p->uniq)) < 0)
return -1;
/* finally the free vars */
ix0 = ix;
for (i = 0; i < n; ++i) {
if (ei_skip_term(s, &ix) < 0)
return -1;
}
if (p != NULL) {
p->n_free_vars = n;
p->free_var_len = ix - ix0;
p->free_vars = ei_malloc(ix - ix0);
if (!(p->free_vars)) return -1;
memcpy(p->free_vars, s + ix0, ix - ix0);
}
s += ix;
*index += s-s0;
return 0;
break;
case ERL_NEW_FUN_EXT:
/* first total size */
n = get32be(s);
/* then the arity */
i = get8(s);
if (p != NULL) p->arity = i;
/* then md5 */
if (p != NULL) memcpy(p->md5, s, 16);
s += 16;
/* then index */
i = get32be(s);
if (p != NULL) p->index = i;
/* then the number of free vars (environment) */
i = get32be(s);
if (p != NULL) p->n_free_vars = i;
/* then the module (atom) */
ix = 0;
if (ei_decode_atom(s, &ix, (p == NULL ? (char*)NULL : p->module)) < 0)
return -1;
/* then the old_index */
if (ei_decode_long(s, &ix, (p == NULL ? (long*)NULL : &p->old_index)) < 0)
return -1;
/* then the old_uniq */
if (ei_decode_long(s, &ix, (p == NULL ? (long*)NULL : &p->uniq)) < 0)
return -1;
/* the the pid */
if (ei_decode_pid(s, &ix, (p == NULL ? (erlang_pid*)NULL : &p->pid)) < 0)
return -1;
/* finally the free vars */
s += ix;
n = n - (s - s0) + 1;
if (n < 0) return -1;
if (p != NULL) {
p->free_var_len = n;
if (n > 0) {
p->free_vars = malloc(n);
if (!(p->free_vars)) return -1;
memcpy(p->free_vars, s, n);
}
}
s += n;
*index += s-s0;
return 0;
break;
default:
return -1;
}
}
void free_fun(erlang_fun* f)
{
if (f->free_var_len > 0)
ei_free(f->free_vars);
}
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