First round of dead file removal

experimental/visual_studio_plugin/src/elf_reader/elf_object.cc

-// Copyright (c) 2011 The Native Client Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "common/types.h"
-#include "elf_reader/elf_structs.h"
-#include "elf_reader/elf_object.h"
-#include "elf_reader/elf_reader.h"
-
-namespace elf_reader {
-
-static uint8_t s_ident[4] = { 0x7F, 'E', 'L', 'F' };
-
-ElfObject::ElfObject()
-  : path_(NULL),
-    length_(0),
-    obj_(NULL),
-    strings_(NULL) {
-  data_.raw_ = 0;
-  shdr_.raw_ = 0;
-  phdr_.raw_ = 0;
-}
-
-
-ElfObject::~ElfObject() {
-  Unload();
-}
-
-void ElfObject::Unload() {
-  if (data_.raw_)
-    free(data_.raw_);
-
-  if (path_)
-    free(path_);
-
-  path_ = NULL;
-  length_ = 0;
-
-  data_.raw_ = NULL;
-  shdr_.raw_ = NULL;
-  phdr_.raw_ = NULL;
-  strings_ = NULL;
-}
-
-bool ElfObject::Load(const char *path) {
-  Unload();
-
-  if (NULL == path) return false;
-
-  FILE *fp = fopen(path, "rb");
-  if (fp) {
-    // Copy the path
-    path_ = reinterpret_cast<char *>(malloc(strlen(path) + 1));
-    strcpy(path_, path);
-
-    // Determine the length
-    fseek(fp, 0, SEEK_END);
-    length_ = ftell(fp);
-    fseek(fp, 0, SEEK_SET);
-
-    /// Verify this is large enough to process the headers
-    if (length_ < sizeof(ElfHdrDef)) {
-      CleanUp(fp);
-      return false;
-    }
-
-    // make sure we allocated enough
-    void *data = malloc(static_cast<size_t>(length_));
-    if (NULL == data) {
-      CleanUp(fp);
-      return false;
-    }
-    data_.raw_ = reinterpret_cast<uint8_t *>(data);
-
-    // Make sure we load the whole file
-    size_t loaded = fread(data_.raw_, 1, length_, fp);
-    if (loaded != length_) {
-      CleanUp(fp);
-      return false;
-    }
-
-    // Verify we have the expected ELF indentifier at the head of the file
-    if (memcmp(data_.def_->e_ident, s_ident, sizeof(s_ident))) {
-      CleanUp(fp);
-      return false;
-    }
-
-    // Set precomputed pointers and verify structure sizes
-    switch (GetClassSize()) {
-      case ELFCLASS32: {
-        // Get the index to the section containing section names
-        uint32_t strndx = data_.hdr32_->e_obj.e_shstrndx;
-
-        // Set precomputed header offsets
-        shdr_.raw_ = &data_.raw_[data_.hdr32_->e_shoff];
-        phdr_.raw_ = &data_.raw_[data_.hdr32_->e_phoff];
-        obj_ = &data_.hdr32_->e_obj;
-
-        // Verify headers are the expected sizes for this Class (machine width)
-        if (data_.hdr32_->e_obj.e_shentsize != sizeof(ElfShdr32) ||
-            data_.hdr32_->e_obj.e_phentsize != sizeof(ElfPhdr32)) {
-          CleanUp(fp);
-          return false;
-        }
-        // If everything checks out, we can precompute strings offset
-        uint8_t *string_offs = &data_.raw_[ shdr_.shdr32_[strndx].sh_offset ];
-        strings_ = reinterpret_cast<char *>(string_offs);
-        break;
-      }
-
-
-      case ELFCLASS64: {
-        // Get the index to the section containing section names
-        uint32_t strndx = data_.hdr64_->e_obj.e_shstrndx;
-
-        // Set precomputed offsets
-        shdr_.raw_ = &data_.raw_[data_.hdr64_->e_shoff];
-        phdr_.raw_ = &data_.raw_[data_.hdr64_->e_phoff];
-        obj_ = &data_.hdr64_->e_obj;
-
-        // Verify headers are the expected sizes for this Class (machine width)
-        if (data_.hdr64_->e_obj.e_shentsize != sizeof(ElfShdr64) ||
-            data_.hdr64_->e_obj.e_phentsize != sizeof(ElfPhdr64)) {
-            CleanUp(fp);
-            return false;
-        }
-        // If everything checks out, we can precompute strings offset
-        uint64_t offset = shdr_.shdr64_[strndx].sh_offset;
-        strings_ = reinterpret_cast<char *>(&data_.raw_[ offset ]);
-        break;
-      }
-
-    }
-
-    fclose(fp);
-    return true;
-  }
-
-  return false;
-}
-
-void ElfObject::CleanUp(FILE *fp) {
-  Unload();
-  fclose(fp);
-}
-
-ElfObject::ClassSize ElfObject::GetClassSize() const {
-  if (data_.def_)
-    return static_cast<ElfObject::ClassSize>(data_.def_->e_class);
-
-  return ELFCLASSERR;
-}
-
-ElfObject::Encoding ElfObject::GetEncoding() const {
-  if (data_.def_)
-    return static_cast<ElfObject::Encoding>(data_.def_->e_encoding);
-
-  return ELFDATAERR;
-}
-
-ElfObject::ObjectType ElfObject::GetObjectType() const {
-  if (data_.def_)
-    return static_cast<ElfObject::ObjectType>(data_.def_->e_type);
-
-  return ET_NONE;
-}
-
-
-const char * ElfObject::GetPath() const {
-  return path_;
-}
-
-const uint8_t *ElfObject::GetData() const {
-  return data_.raw_;
-}
-
-uint16_t ElfObject::GetProgramHeaderCount() const {
-  if (obj_) {
-    return obj_->e_phnum;
-  }
-
-  return 0;
-}
-
-uint16_t ElfObject::GetSectionHeaderCount() const {
-  if (obj_) {
-    return obj_->e_shnum;
-  }
-
-  return 0;
-}
-
-void ElfObject::Parse(IElfReader* reader) const {
-  if (NULL == reader)
-    return;
-
-  bool lsb = GetEncoding() == ELFDATA2LSB;
-  reader->Init(path_, data_.raw_, length_, GetClassSize(), lsb);
-
-  if (reader->SectionHeadersStart(GetSectionHeaderCount())) {
-    // NOTE: Section index 0, 0xFF00-0xFFFF are special, so we
-    //      skip '0' since it is invalid and zero filled.
-    uint32_t a;
-    for (a = 1; a < GetSectionHeaderCount(); a++) {
-      const char *path;
-      uint32_t type;
-      uint32_t flags;
-      void* start;
-      uint64_t length;
-      uint64_t virt;
-
-      switch (GetClassSize()) {
-        case ELFCLASS32: {
-          ElfShdr32 *sec = &shdr_.shdr32_[a];
-          path = &strings_[sec->sh_name];
-          flags = sec->sh_flags;
-          length= sec->sh_size;
-          start = &data_.raw_[sec->sh_offset];
-          type = sec->sh_type;
-          virt = sec->sh_addr;
-          break;
-        }
-
-        case ELFCLASS64: {
-          ElfShdr64 *sec = &shdr_.shdr64_[a];
-          path = &strings_[sec->sh_name];
-          flags = static_cast<uint32_t>(sec->sh_flags);
-          length= sec->sh_size;
-          start = &data_.raw_[sec->sh_offset];
-          type = sec->sh_type;
-          virt = sec->sh_addr;
-          break;
-        }
-
-        // This is actually unreachible since we verified the class on load.
-        default:
-          continue;
-      }
-      reader->AddSectionHeader(path, start, virt, type, flags, length);
-    }
-    reader->SectionHeadersEnd();
-  }
-}
-
-}  // namespace elf_reader
-