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-rw-r--r--lib/erl_interface/src/decode/decode_fun.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/lib/erl_interface/src/decode/decode_fun.c b/lib/erl_interface/src/decode/decode_fun.c
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+++ b/lib/erl_interface/src/decode/decode_fun.c
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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);
+}