Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libelf/elf32_getchdr.c b/libelf/elf32_getchdr.c
new file mode 100644
index 0000000..982a614
--- /dev/null
+++ b/libelf/elf32_getchdr.c
@@ -0,0 +1,83 @@
+/* Return section compression header.
+ Copyright (C) 2015 Red Hat, Inc.
+ This file is part of elfutils.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <libelf.h>
+#include "libelfP.h"
+#include "common.h"
+
+#ifndef LIBELFBITS
+# define LIBELFBITS 32
+#endif
+
+
+ElfW2(LIBELFBITS,Chdr) *
+elfw2(LIBELFBITS,getchdr) (Elf_Scn *scn)
+{
+ ElfW2(LIBELFBITS,Shdr) *shdr = elfw2(LIBELFBITS,getshdr) (scn);
+ if (shdr == NULL)
+ return NULL;
+
+ /* Must have SHF_COMPRESSED flag set. Allocated or no bits sections
+ can never be compressed. */
+ if ((shdr->sh_flags & SHF_ALLOC) != 0)
+ {
+ __libelf_seterrno (ELF_E_INVALID_SECTION_FLAGS);
+ return NULL;
+ }
+
+ if (shdr->sh_type == SHT_NULL
+ || shdr->sh_type == SHT_NOBITS)
+ {
+ __libelf_seterrno (ELF_E_INVALID_SECTION_TYPE);
+ return NULL;
+ }
+
+ if ((shdr->sh_flags & SHF_COMPRESSED) == 0)
+ {
+ __libelf_seterrno (ELF_E_NOT_COMPRESSED);
+ return NULL;
+ }
+
+ /* This makes sure the data is in the correct format, so we don't
+ need to swap fields. */
+ Elf_Data *d = elf_getdata (scn, NULL);
+ if (d == NULL)
+ return NULL;
+
+ if (d->d_size < sizeof (ElfW2(LIBELFBITS,Chdr)) || d->d_buf == NULL)
+ {
+ __libelf_seterrno (ELF_E_INVALID_DATA);
+ return NULL;
+ }
+
+ return (ElfW2(LIBELFBITS,Chdr) *) d->d_buf;
+}