// 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_PATCHER_X86_32_H_ #define COURGETTE_PATCHER_X86_32_H_ #include #include "base/logging.h" #include "courgette/courgette_flow.h" #include "courgette/ensemble.h" #include "courgette/region.h" #include "courgette/streams.h" namespace courgette { // PatcherX86_32 is the universal patcher for all executables. The executable // type is determined by the program detector. class PatcherX86_32 : public TransformationPatcher { public: explicit PatcherX86_32(const Region& region) : ensemble_region_(region), base_offset_(0), base_length_(0) { } PatcherX86_32(const PatcherX86_32&) = delete; PatcherX86_32& operator=(const PatcherX86_32&) = delete; 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) { if (!corrected_parameters->Empty()) return C_GENERAL_ERROR; // Don't expect any corrected parameters. CourgetteFlow flow; RegionBuffer only_buffer( Region(ensemble_region_.start() + base_offset_, base_length_)); flow.ReadDisassemblerFromBuffer(flow.ONLY, only_buffer); flow.CreateAssemblyProgramFromDisassembler(flow.ONLY, false); flow.CreateEncodedProgramFromDisassemblerAndAssemblyProgram(flow.ONLY); flow.DestroyAssemblyProgram(flow.ONLY); flow.DestroyDisassembler(flow.ONLY); flow.WriteSinkStreamSetFromEncodedProgram(flow.ONLY, transformed_element); if (flow.failed()) LOG(ERROR) << flow.message(); return flow.status(); } Status Reform(SourceStreamSet* transformed_element, SinkStream* reformed_element) { CourgetteFlow flow; flow.ReadEncodedProgramFromSourceStreamSet(flow.ONLY, transformed_element); flow.WriteExecutableFromEncodedProgram(flow.ONLY, reformed_element); if (flow.failed()) LOG(ERROR) << flow.message(); return flow.status(); } private: Region ensemble_region_; uint32_t base_offset_; uint32_t base_length_; }; } // namespace courgette #endif // COURGETTE_PATCHER_X86_32_H_