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      1 /* Copyright (C) 2007-2010 The Android Open Source Project
      2 **
      3 ** This software is licensed under the terms of the GNU General Public
      4 ** License version 2, as published by the Free Software Foundation, and
      5 ** may be copied, distributed, and modified under those terms.
      6 **
      7 ** This program is distributed in the hope that it will be useful,
      8 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
      9 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     10 ** GNU General Public License for more details.
     11 */
     12 
     13 /*
     14  * Contains implementation of a class ElfMappedSection, that encapsulates
     15  * a section of an ELF file, mapped to memory.
     16  */
     17 
     18 #include "elf_defs.h"
     19 #include "elf_mapped_section.h"
     20 
     21 ElfMappedSection::ElfMappedSection()
     22     : mapped_at_(NULL),
     23       data_(NULL),
     24       size_(0) {
     25 }
     26 
     27 ElfMappedSection::~ElfMappedSection() {
     28   if (mapped_at_ != NULL) {
     29     mapfile_unmap(mapped_at_, diff_ptr(mapped_at_, data_) + size_);
     30   }
     31 }
     32 
     33 bool ElfMappedSection::map(MapFile* handle,
     34                            Elf_Xword offset,
     35                            Elf_Word size) {
     36     void* section_ptr;
     37     size_t mapped_bytes;
     38     mapped_at_ = mapfile_map(handle, offset, size, PROT_READ,
     39                              &section_ptr, &mapped_bytes);
     40     if (mapped_at_ == NULL) {
     41         return false;
     42     }
     43 
     44     data_ = section_ptr;
     45     size_ = (Elf_Word)mapped_bytes;
     46 
     47     return true;
     48 }
     49