Move Courgette...

courgette/ensemble.cc

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// *** File comments
+
+#include "courgette/ensemble.h"
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/string_util.h"
+
+#include "courgette/image_info.h"
+#include "courgette/region.h"
+#include "courgette/streams.h"
+#include "courgette/simple_delta.h"
+
+namespace courgette {
+
+Element::Element(Kind kind, Ensemble* ensemble, const Region& region)
+    : kind_(kind), ensemble_(ensemble), region_(region) {
+}
+
+std::string Element::Name() const {
+  return ensemble_->name() + "("
+      + IntToString(kind()) + ","
+      + Uint64ToString(offset_in_ensemble()) + ","
+      + Uint64ToString(region().length()) + ")";
+}
+
+// A subclass of Element that has a PEInfo.
+class ElementWinPE : public Element {
+ public:
+  ElementWinPE(Kind kind, Ensemble* ensemble, const Region& region,
+               PEInfo* info)
+      : Element(kind, ensemble, region),
+        pe_info_(info) {
+  }
+
+  virtual PEInfo* GetPEInfo() const { return pe_info_; }
+
+ protected:
+  ~ElementWinPE() { delete pe_info_; }
+
+ private:
+  PEInfo* pe_info_;  // Owned by |this|.
+};
+
+// Scans the Ensemble's region, sniffing out Elements.  We assume that the
+// elements do not overlap.
+Status Ensemble::FindEmbeddedElements() {
+  size_t length = region_.length();
+  const uint8* start = region_.start();
+
+  size_t position = 0;
+  while (position < length) {
+    // Quick test; Windows executables begin with 'MZ'.
+    if (start[position] == 'M' &&
+        position + 1 < length && start[position + 1] == 'Z') {
+      courgette::PEInfo *info = new courgette::PEInfo();
+      info->Init(start + position, length - position);
+      if (info->ParseHeader()) {
+        Region region(start + position, info->length());
+
+        if (info->has_text_section()) {
+          Element* element = new ElementWinPE(Element::WIN32_X86_WITH_CODE,
+                                              this, region, info);
+          owned_elements_.push_back(element);
+          elements_.push_back(element);
+          position += region.length();
+          continue;
+        }
+
+        // If we had a clever transformation for resource-only executables we
+        // should identify the suitable elements here:
+        if (!info->has_text_section() && false) {
+          Element* element = new ElementWinPE(Element::WIN32_NOCODE,
+                                              this, region, info);
+          owned_elements_.push_back(element);
+          elements_.push_back(element);
+          position += region.length();
+          continue;
+        }
+      }
+      delete info;
+    }
+
+    // This is where to add new formats, e.g. Linux executables, Dalvik
+    // executables etc.
+
+    // No Element found at current position.
+    ++position;
+  }
+  return C_OK;
+}
+
+Ensemble::~Ensemble() {
+  for (size_t i = 0;  i < owned_elements_.size();  ++i)
+    delete owned_elements_[i];
+}
+
+}  // namespace