courgette/ensemble.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "courgette/ensemble.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/strings/string_number_conversions.h"
   9
  10 #include "courgette/region.h"
  11 #include "courgette/simple_delta.h"
  12 #include "courgette/streams.h"
  13
  14 namespace courgette {
  15
  16 Element::Element(ExecutableType kind,
  17                  Ensemble* ensemble,
  18                  const Region& region)
  19     : kind_(kind), ensemble_(ensemble), region_(region) {
  20 }
  21
  22 Element::~Element() {}
  23
  24 std::string Element::Name() const {
  25   return ensemble_->name() + "("
  26       + base::IntToString(kind()) + ","
  27       + base::Uint64ToString(offset_in_ensemble()) + ","
  28       + base::Uint64ToString(region().length()) + ")";
  29 }
  30
  31 // Scans the Ensemble's region, sniffing out Elements.  We assume that the
  32 // elements do not overlap.
  33 Status Ensemble::FindEmbeddedElements() {
  34
  35   size_t length = region_.length();
  36   const uint8* start = region_.start();
  37
  38   size_t position = 0;
  39   while (position < length) {
  40     ExecutableType type;
  41     size_t detected_length;
  42
  43     Status result = DetectExecutableType(start + position,
  44                                          length - position,
  45                                          &type, &detected_length);
  46
  47     if (result == C_OK) {
  48       Region region(start + position, detected_length);
  49
  50       Element* element = new Element(type, this, region);
  51       owned_elements_.push_back(element);
  52       elements_.push_back(element);
  53       position += region.length();
  54     } else {
  55       position++;
  56     }
  57   }
  58   return C_OK;
  59 }
  60
  61 Ensemble::~Ensemble() {
  62   for (size_t i = 0;  i < owned_elements_.size();  ++i)
  63     delete owned_elements_[i];
  64 }
  65
  66 }  // namespace