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-rw-r--r--ext/libelf/libelf_allocate.c206
1 files changed, 206 insertions, 0 deletions
diff --git a/ext/libelf/libelf_allocate.c b/ext/libelf/libelf_allocate.c
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index 000000000..c4c1b6ac5
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+++ b/ext/libelf/libelf_allocate.c
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+/*-
+ * Copyright (c) 2006 Joseph Koshy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Internal APIs
+ */
+
+#include <sys/errno.h>
+
+#include <assert.h>
+#include "libelf.h"
+#include <stdlib.h>
+#include <string.h>
+
+#include "_libelf.h"
+
+Elf *
+_libelf_allocate_elf(void)
+{
+ Elf *e;
+
+ if ((e = malloc(sizeof(*e))) == NULL) {
+ LIBELF_SET_ERROR(RESOURCE, errno);
+ return NULL;
+ }
+
+ e->e_activations = 1;
+ e->e_arhdr = NULL;
+ e->e_byteorder = ELFDATANONE;
+ e->e_class = ELFCLASSNONE;
+ e->e_cmd = ELF_C_NULL;
+ e->e_fd = -1;
+ e->e_flags = 0;
+ e->e_kind = ELF_K_NONE;
+ e->e_parent = NULL;
+ e->e_rawfile = NULL;
+ e->e_rawsize = 0;
+ e->e_version = LIBELF_PRIVATE(version);
+
+ (void) memset(&e->e_u, 0, sizeof(e->e_u));
+
+ return (e);
+}
+
+void
+_libelf_init_elf(Elf *e, Elf_Kind kind)
+{
+ assert(e != NULL);
+ assert(e->e_kind == ELF_K_NONE);
+
+ e->e_kind = kind;
+
+ switch (kind) {
+ case ELF_K_ELF:
+ STAILQ_INIT(&e->e_u.e_elf.e_scn);
+ break;
+ default:
+ break;
+ }
+}
+
+#define FREE(P) do { \
+ if (P) \
+ free(P); \
+ } while (0)
+
+
+Elf *
+_libelf_release_elf(Elf *e)
+{
+ switch (e->e_kind) {
+ case ELF_K_AR:
+ FREE(e->e_u.e_ar.e_symtab);
+ break;
+
+ case ELF_K_ELF:
+ switch (e->e_class) {
+ case ELFCLASS32:
+ FREE(e->e_u.e_elf.e_ehdr.e_ehdr32);
+ FREE(e->e_u.e_elf.e_phdr.e_phdr32);
+ break;
+ case ELFCLASS64:
+ FREE(e->e_u.e_elf.e_ehdr.e_ehdr64);
+ FREE(e->e_u.e_elf.e_phdr.e_phdr64);
+ break;
+ }
+
+ assert(STAILQ_EMPTY(&e->e_u.e_elf.e_scn));
+
+ if (e->e_arhdr) {
+ FREE(e->e_arhdr->ar_name);
+ FREE(e->e_arhdr->ar_rawname);
+ free(e->e_arhdr);
+ }
+
+ break;
+
+ default:
+ break;
+ }
+
+ free(e);
+
+ return (NULL);
+}
+
+Elf_Data *
+_libelf_allocate_data(Elf_Scn *s)
+{
+ Elf_Data *d;
+
+ if ((d = calloc((size_t) 1, sizeof(Elf_Data))) == NULL) {
+ LIBELF_SET_ERROR(RESOURCE, 0);
+ return (NULL);
+ }
+
+ d->d_scn = s;
+
+ return (d);
+}
+
+Elf_Data *
+_libelf_release_data(Elf_Data *d)
+{
+
+ if (d->d_flags & LIBELF_F_MALLOCED)
+ free(d->d_buf);
+
+ free(d);
+
+ return (NULL);
+}
+
+Elf_Scn *
+_libelf_allocate_scn(Elf *e, size_t ndx)
+{
+ Elf_Scn *s;
+
+ if ((s = calloc((size_t) 1, sizeof(Elf_Scn))) == NULL) {
+ LIBELF_SET_ERROR(RESOURCE, errno);
+ return (NULL);
+ }
+
+ s->s_elf = e;
+ s->s_ndx = ndx;
+
+ STAILQ_INIT(&s->s_data);
+ STAILQ_INIT(&s->s_rawdata);
+
+ STAILQ_INSERT_TAIL(&e->e_u.e_elf.e_scn, s, s_next);
+
+ return (s);
+}
+
+Elf_Scn *
+_libelf_release_scn(Elf_Scn *s)
+{
+ Elf *e;
+ Elf_Data *d, *td;
+
+ assert(s != NULL);
+
+ STAILQ_FOREACH_SAFE(d, &s->s_data, d_next, td) {
+ STAILQ_REMOVE(&s->s_data, d, _Elf_Data, d_next);
+ d = _libelf_release_data(d);
+ }
+
+ STAILQ_FOREACH_SAFE(d, &s->s_rawdata, d_next, td) {
+ assert((d->d_flags & LIBELF_F_MALLOCED) == 0);
+ STAILQ_REMOVE(&s->s_rawdata, d, _Elf_Data, d_next);
+ d = _libelf_release_data(d);
+ }
+
+ e = s->s_elf;
+
+ assert(e != NULL);
+
+ STAILQ_REMOVE(&e->e_u.e_elf.e_scn, s, _Elf_Scn, s_next);
+
+ free(s);
+
+ return (NULL);
+}