// Copyright (c) 2018-present, iQIYI, Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//

// Created by caikelun on 2018-04-11.

#ifndef XH_ELF_H
#define XH_ELF_H 1

#include <stdint.h>
#include <elf.h>
#include <link.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef struct
{
    const char *pathname;
    
    ElfW(Addr)  base_addr;
    ElfW(Addr)  bias_addr;
    
    ElfW(Ehdr) *ehdr;
    ElfW(Phdr) *phdr;

    ElfW(Dyn)  *dyn; //.dynamic
    ElfW(Word)  dyn_sz;

    const char *strtab; //.dynstr (string-table)
    ElfW(Sym)  *symtab; //.dynsym (symbol-index to string-table's offset)

    ElfW(Addr)  relplt; //.rel.plt or .rela.plt
    ElfW(Word)  relplt_sz;
    
    ElfW(Addr)  reldyn; //.rel.dyn or .rela.dyn
    ElfW(Word)  reldyn_sz;
    
    ElfW(Addr)  relandroid; //android compressed rel or rela
    ElfW(Word)  relandroid_sz;

    //for ELF hash
    uint32_t   *bucket;
    uint32_t    bucket_cnt;
    uint32_t   *chain;
    uint32_t    chain_cnt; //invalid for GNU hash

    //append for GNU hash
    uint32_t    symoffset;
    ElfW(Addr) *bloom;
    uint32_t    bloom_sz;
    uint32_t    bloom_shift;
    
    int         is_use_rela;
    int         is_use_gnu_hash;
} xh_elf_t;

int xh_elf_init(xh_elf_t *self, uintptr_t base_addr, const char *pathname);
int xh_elf_hook(xh_elf_t *self, const char *symbol, void *new_func, void **old_func);

int xh_elf_check_elfheader(uintptr_t base_addr);

#ifdef __cplusplus
}
#endif

#endif