diff options
Diffstat (limited to 'libelf/libelf.h')
| -rw-r--r-- | libelf/libelf.h | 43 |
1 files changed, 40 insertions, 3 deletions
diff --git a/libelf/libelf.h b/libelf/libelf.h index 54f7c29b..a376d880 100644 --- a/libelf/libelf.h +++ b/libelf/libelf.h @@ -1,5 +1,5 @@ /* Interface for libelf. - Copyright (C) 1998-2010 Red Hat, Inc. + Copyright (C) 1998-2010, 2015 Red Hat, Inc. This file is part of elfutils. This file is free software; you can redistribute it and/or modify @@ -268,6 +268,40 @@ extern Elf32_Shdr *elf32_getshdr (Elf_Scn *__scn); extern Elf64_Shdr *elf64_getshdr (Elf_Scn *__scn); +/* When type is ELF_ZSCN_T_NONE then ch_type is ignored and the raw + section data is decompressed if the section was compressed before. + The returned section header will have an updated sh_size, + sh_addralign and will have SHF_COMPRESSED cleared from the + sh_flags. sh_entsize isn't changed. If the section wasn't + compressed, or an error occurred while decompressing the section + date NULL is returned and elf_err is set. + + When type is ELF_ZSCN_T_GNU or ELF_ZSCN_T_ELF ch_type must be a + valid ELFCOMPRESS algorithm. Currently the only valid value is + ELFCOMPRESS_ZLIB. If the section wasn't compressed yet then the + Elf_Data is converted to the raw format of the Elf image and + compressed using the given algorithm. The correct compression + format header will be added at the start of the new raw data for the + section. The returned section header will have an updated sh_size, + sh_addralign and if type was ELF_ZSCN_T_ELF sh_flags will have + SHF_COMPRESSED set. sh_entsize isn't changed. If the section data + was already compressed, or an unknown compression type or algorithm + was given or if an error occurred while compressing NULL is returned + and elf_err is set. + + Too switch between GNU and ELF compression types or to use another + compression algorithm one has to uncompress the section first and + then compress using the other type/algorithm. + + All previous returned Elf_Data buffers are invalidated by this call + and should no longer be accessed. + + Note that although this changes the header and data returned it + doesn't mark the section as dirty. To keep the changes when calling + elf_update the section has to be flagged ELF_F_DIRTY. */ +extern int elf_compress (Elf_Scn *scn, int type); +extern int elf_compress_gnu (Elf_Scn *scn, int compress); + /* Set or clear flags for ELF file. */ extern unsigned int elf_flagelf (Elf *__elf, Elf_Cmd __cmd, unsigned int __flags); @@ -288,8 +322,11 @@ extern unsigned int elf_flagshdr (Elf_Scn *__scn, Elf_Cmd __cmd, unsigned int __flags); -/* Get data from section while translating from file representation - to memory representation. */ +/* Get data from section while translating from file representation to + memory representation. The Elf_Data d_type is set based on the + section type if known. Otherwise d_type is set to ELF_T_BYTE. If + the section contains compressed data d_type is also set to + ELF_T_BYTE. */ extern Elf_Data *elf_getdata (Elf_Scn *__scn, Elf_Data *__data); /* Get uninterpreted section content. */ |