/* Compress or decompress an ELF file.
- Copyright (C) 2015, 2016 Red Hat, Inc.
+ Copyright (C) 2015, 2016, 2018 Red Hat, Inc.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
return (sections[ndx / WORD_BITS] & (1U << (ndx % WORD_BITS))) != 0;
}
+ /* How many sections are we going to change? */
+ size_t get_sections (void)
+ {
+ size_t s = 0;
+ for (size_t i = 0; i < shnum / WORD_BITS + 1; i++)
+ s += __builtin_popcount (sections[i]);
+ return s;
+ }
+
int cleanup (int res)
{
elf_end (elf);
names change and whether there is a symbol table that might need
to be adjusted be if the section header name table is changed.
+ If nothing needs changing, and the input and output file are the
+ same, we are done.
+
Second a collection pass that creates the Elf sections and copies
the data. This pass will compress/decompress section data when
needed. And it will collect all data needed if we'll need to
if (section_name_matches (sname))
{
- if (shdr->sh_type != SHT_NOBITS
+ if (!force && type == T_DECOMPRESS
+ && (shdr->sh_flags & SHF_COMPRESSED) == 0
+ && strncmp (sname, ".zdebug", strlen (".zdebug")) != 0)
+ {
+ if (verbose > 0)
+ printf ("[%zd] %s already decompressed\n", ndx, sname);
+ }
+ else if (!force && type == T_COMPRESS_ZLIB
+ && (shdr->sh_flags & SHF_COMPRESSED) != 0)
+ {
+ if (verbose > 0)
+ printf ("[%zd] %s already compressed\n", ndx, sname);
+ }
+ else if (!force && type == T_COMPRESS_GNU
+ && strncmp (sname, ".zdebug", strlen (".zdebug")) == 0)
+ {
+ if (verbose > 0)
+ printf ("[%zd] %s already GNU compressed\n", ndx, sname);
+ }
+ else if (shdr->sh_type != SHT_NOBITS
&& (shdr->sh_flags & SHF_ALLOC) == 0)
{
set_section (ndx);
}
}
+ if (foutput == NULL && get_sections () == 0)
+ {
+ if (verbose > 0)
+ printf ("Nothing to do.\n");
+ fnew = NULL;
+ return cleanup (0);
+ }
+
if (adjust_names)
{
names = dwelf_strtab_init (true);
N_("Print a message for each section being (de)compressed"),
0 },
{ "force", 'f', NULL, 0,
- N_("Force compression of section even if it would become larger"),
+ N_("Force compression of section even if it would become larger or update/rewrite the file even if no section would be (de)compressed"),
0 },
{ "permissive", 'p', NULL, 0,
N_("Relax a few rules to handle slightly broken ELF files"),