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| 1 // Copyright (c) 2009 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 // *** File comments | |
| 6 | |
| 7 #include "third_party/courgette/ensemble.h" | |
| 8 | |
| 9 #include "base/basictypes.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "base/string_util.h" | |
| 12 | |
| 13 #include "third_party/courgette/image_info.h" | |
| 14 #include "third_party/courgette/region.h" | |
| 15 #include "third_party/courgette/streams.h" | |
| 16 #include "third_party/courgette/simple_delta.h" | |
| 17 | |
| 18 namespace courgette { | |
| 19 | |
| 20 Element::Element(Kind kind, Ensemble* ensemble, const Region& region) | |
| 21 : kind_(kind), ensemble_(ensemble), region_(region) { | |
| 22 } | |
| 23 | |
| 24 std::string Element::Name() const { | |
| 25 return ensemble_->name() + "(" | |
| 26 + IntToString(kind()) + "," | |
| 27 + Uint64ToString(offset_in_ensemble()) + "," | |
| 28 + Uint64ToString(region().length()) + ")"; | |
| 29 } | |
| 30 | |
| 31 // A subclass of Element that has a PEInfo. | |
| 32 class ElementWinPE : public Element { | |
| 33 public: | |
| 34 ElementWinPE(Kind kind, Ensemble* ensemble, const Region& region, | |
| 35 PEInfo* info) | |
| 36 : Element(kind, ensemble, region), | |
| 37 pe_info_(info) { | |
| 38 } | |
| 39 | |
| 40 virtual PEInfo* GetPEInfo() const { return pe_info_; } | |
| 41 | |
| 42 protected: | |
| 43 ~ElementWinPE() { delete pe_info_; } | |
| 44 | |
| 45 private: | |
| 46 PEInfo* pe_info_; // Owned by |this|. | |
| 47 }; | |
| 48 | |
| 49 // Scans the Ensemble's region, sniffing out Elements. We assume that the | |
| 50 // elements do not overlap. | |
| 51 Status Ensemble::FindEmbeddedElements() { | |
| 52 size_t length = region_.length(); | |
| 53 const uint8* start = region_.start(); | |
| 54 | |
| 55 size_t position = 0; | |
| 56 while (position < length) { | |
| 57 // Quick test; Windows executables begin with 'MZ'. | |
| 58 if (start[position] == 'M' && | |
| 59 position + 1 < length && start[position + 1] == 'Z') { | |
| 60 courgette::PEInfo *info = new courgette::PEInfo(); | |
| 61 info->Init(start + position, length - position); | |
| 62 if (info->ParseHeader()) { | |
| 63 Region region(start + position, info->length()); | |
| 64 | |
| 65 if (info->has_text_section()) { | |
| 66 Element* element = new ElementWinPE(Element::WIN32_X86_WITH_CODE, | |
| 67 this, region, info); | |
| 68 owned_elements_.push_back(element); | |
| 69 elements_.push_back(element); | |
| 70 position += region.length(); | |
| 71 continue; | |
| 72 } | |
| 73 | |
| 74 // If we had a clever transformation for resource-only executables we | |
| 75 // should identify the suitable elements here: | |
| 76 if (!info->has_text_section() && false) { | |
| 77 Element* element = new ElementWinPE(Element::WIN32_NOCODE, | |
| 78 this, region, info); | |
| 79 owned_elements_.push_back(element); | |
| 80 elements_.push_back(element); | |
| 81 position += region.length(); | |
| 82 continue; | |
| 83 } | |
| 84 } | |
| 85 delete info; | |
| 86 } | |
| 87 | |
| 88 // This is where to add new formats, e.g. Linux executables, Dalvik | |
| 89 // executables etc. | |
| 90 | |
| 91 // No Element found at current position. | |
| 92 ++position; | |
| 93 } | |
| 94 return C_OK; | |
| 95 } | |
| 96 | |
| 97 Ensemble::~Ensemble() { | |
| 98 for (size_t i = 0; i < owned_elements_.size(); ++i) | |
| 99 delete owned_elements_[i]; | |
| 100 } | |
| 101 | |
| 102 } // namespace | |
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