// Copyright (c) 2012 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. #ifndef COURGETTE_WIN32_X86_PATCHER_H_ #define COURGETTE_WIN32_X86_PATCHER_H_ #include #include "base/macros.h" #include "base/memory/scoped_ptr.h" #include "courgette/assembly_program.h" #include "courgette/encoded_program.h" #include "courgette/ensemble.h" #include "courgette/program_detector.h" namespace courgette { // PatcherX86_32 is the universal patcher for all executables. The executable // type is determined by ParseDetectedExecutable function. // class PatcherX86_32 : public TransformationPatcher { public: explicit PatcherX86_32(const Region& region) : ensemble_region_(region), base_offset_(0), base_length_(0) { } Status Init(SourceStream* parameter_stream) { if (!parameter_stream->ReadVarint32(&base_offset_)) return C_BAD_TRANSFORM; if (!parameter_stream->ReadVarint32(&base_length_)) return C_BAD_TRANSFORM; if (base_offset_ > ensemble_region_.length()) return C_BAD_TRANSFORM; if (base_length_ > ensemble_region_.length() - base_offset_) return C_BAD_TRANSFORM; return C_OK; } Status PredictTransformParameters(SinkStreamSet* predicted_parameters) { // No code needed to write an 'empty' predicted parameter set. return C_OK; } Status Transform(SourceStreamSet* corrected_parameters, SinkStreamSet* transformed_element) { Status status; if (!corrected_parameters->Empty()) return C_GENERAL_ERROR; // Don't expect any corrected parameters. scoped_ptr program; status = ParseDetectedExecutable(ensemble_region_.start() + base_offset_, base_length_, &program); if (status != C_OK) return status; scoped_ptr encoded; status = Encode(*program, &encoded); if (status != C_OK) return status; program.reset(); return WriteEncodedProgram(encoded.get(), transformed_element); } Status Reform(SourceStreamSet* transformed_element, SinkStream* reformed_element) { Status status; scoped_ptr encoded_program; status = ReadEncodedProgram(transformed_element, &encoded_program); if (status != C_OK) return status; return Assemble(encoded_program.get(), reformed_element); } private: Region ensemble_region_; uint32_t base_offset_; uint32_t base_length_; DISALLOW_COPY_AND_ASSIGN(PatcherX86_32); }; } // namespace #endif // COURGETTE_WIN32_X86_PATCHER_H_