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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2001-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions 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;
erlang_pid* p_pid;
char* p_module;
long* p_index;
long* p_uniq;
long* p_old_index;
if (p != NULL) {
p_pid = &p->u.closure.pid;
p_module = &p->module[0];
p_index = &p->u.closure.index;
p_uniq = &p->u.closure.uniq;
p_old_index = &p->u.closure.old_index;
}
else {
p_index = NULL; p_uniq = NULL; p_old_index = NULL;
p_pid = NULL; p_module = NULL;
}
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_pid) < 0)
return -1;
/* then the module (atom) */
if (ei_decode_atom_as(s, &ix, p_module, MAXATOMLEN_UTF8, ERLANG_UTF8,
NULL, NULL) < 0)
return -1;
/* then the index */
if (ei_decode_long(s, &ix, p_index) < 0)
return -1;
/* then the uniq */
if (ei_decode_long(s, &ix, 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->u.closure.n_free_vars = n;
p->u.closure.free_var_len = ix - ix0;
if (p->u.closure.free_var_len > 0) {
p->u.closure.free_vars = ei_malloc(p->u.closure.free_var_len);
if (!(p->u.closure.free_vars)) return -1;
memcpy(p->u.closure.free_vars, s + ix0, p->u.closure.free_var_len);
}
}
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->type = EI_FUN_CLOSURE;
p->arity = i;
/* then md5 */
memcpy(p->u.closure.md5, s, 16);
}
s += 16;
/* then index */
i = get32be(s);
if (p != NULL) p->u.closure.index = i;
/* then the number of free vars (environment) */
i = get32be(s);
if (p != NULL) p->u.closure.n_free_vars = i;
/* then the module (atom) */
ix = 0;
if (ei_decode_atom_as(s, &ix, p_module, MAXATOMLEN_UTF8, ERLANG_UTF8,
NULL, NULL) < 0)
return -1;
/* then the old_index */
if (ei_decode_long(s, &ix, p_old_index) < 0)
return -1;
/* then the old_uniq */
if (ei_decode_long(s, &ix, p_uniq) < 0)
return -1;
/* the the pid */
if (ei_decode_pid(s, &ix, 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->u.closure.free_var_len = n;
if (n > 0) {
p->u.closure.free_vars = malloc(n);
if (!(p->u.closure.free_vars)) return -1;
memcpy(p->u.closure.free_vars, s, n);
}
}
s += n;
*index += s-s0;
return 0;
break;
case ERL_EXPORT_EXT: {
char* p_func;
long* p_arity;
int used;
if (p) {
p->type = EI_FUN_EXPORT;
p_arity = &p->arity;
}
else {
p_arity = NULL;
}
ix = 0;
if (ei_decode_atom_as(s, &ix, p_module, MAXATOMLEN_UTF8, ERLANG_UTF8,
NULL, NULL) < 0)
return -1;
if (p) {
/* try use module buffer for function name */
used = strlen(p->module) + 1;
p_func = p->module + used;
p->u.exprt.func = p_func;
p->u.exprt.func_allocated = 0;
}
else {
used = 0;
p_func = NULL;
}
while (ei_decode_atom_as(s, &ix, p_func, MAXATOMLEN_UTF8-used,
ERLANG_UTF8, NULL, NULL) < 0) {
if (!used)
return -1;
p_func = malloc(MAXATOMLEN_UTF8);
p->u.exprt.func = p_func;
p->u.exprt.func_allocated = 1;
used = 0;
}
if (ei_decode_long(s, &ix, p_arity) < 0)
return -1;
s += ix;
*index += s - s0;
return 0;
}
default:
return -1;
}
}
void free_fun(erlang_fun* f)
{
switch (f->type) {
case EI_FUN_CLOSURE:
if (f->u.closure.free_var_len > 0)
ei_free(f->u.closure.free_vars);
break;
case EI_FUN_EXPORT:
if (f->u.exprt.func_allocated)
ei_free(f->u.exprt.func);
break;
}
}
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