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// Copyright (c) 2011 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.
#include "courgette/ensemble.h"
#include "base/basictypes.h"
#include "base/string_number_conversions.h"
#include "courgette/image_info.h"
#include "courgette/region.h"
#include "courgette/streams.h"
#include "courgette/simple_delta.h"
namespace courgette {
Element::Element(ExecutableType kind,
Ensemble* ensemble,
const Region& region,
PEInfo* info)
: kind_(kind), ensemble_(ensemble), region_(region), info_(info) {
}
Element::~Element() {
delete info_;
}
std::string Element::Name() const {
return ensemble_->name() + "("
+ base::IntToString(kind()) + ","
+ base::Uint64ToString(offset_in_ensemble()) + ","
+ base::Uint64ToString(region().length()) + ")";
}
// 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) {
ExecutableType type = DetectExecutableType(start + position,
length - position);
//
// TODO(dgarrett) This switch can go away totally after two things.
//
// Make ImageInfo generic for all executable types.
// Find a generic way to handle length detection for executables.
//
// When this switch is gone, that's one less piece of code that is
// executable type aware.
//
switch (type) {
case UNKNOWN: {
// No Element found at current position.
++position;
break;
}
case WIN32_X86: {
// The Info is only created to detect the length of the executable
courgette::PEInfo* info(new courgette::PEInfo());
info->Init(start + position, length - position);
if (!info->ParseHeader()) {
delete info;
position++;
break;
}
Region region(start + position, info->length());
Element* element = new Element(type, this, region, info);
owned_elements_.push_back(element);
elements_.push_back(element);
position += region.length();
break;
}
}
}
return C_OK;
}
Ensemble::~Ensemble() {
for (size_t i = 0; i < owned_elements_.size(); ++i)
delete owned_elements_[i];
}
} // namespace
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