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// Copyright 2016 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/program_detector.h"
#include <utility>
#include "courgette/assembly_program.h"
#include "courgette/disassembler.h"
#include "courgette/disassembler_elf_32_arm.h"
#include "courgette/disassembler_elf_32_x86.h"
#include "courgette/disassembler_win32_x64.h"
#include "courgette/disassembler_win32_x86.h"
namespace courgette {
namespace {
// Returns a new instance of Disassembler subclass if binary data given in
// |buffer| and |length| matches a known binary format, otherwise null.
scoped_ptr<Disassembler> DetectDisassembler(const void* buffer, size_t length) {
scoped_ptr<Disassembler> disassembler;
disassembler.reset(new DisassemblerWin32X86(buffer, length));
if (disassembler->ParseHeader())
return disassembler;
disassembler.reset(new DisassemblerWin32X64(buffer, length));
if (disassembler->ParseHeader())
return disassembler;
disassembler.reset(new DisassemblerElf32X86(buffer, length));
if (disassembler->ParseHeader())
return disassembler;
disassembler.reset(new DisassemblerElf32ARM(buffer, length));
if (disassembler->ParseHeader())
return disassembler;
return nullptr;
}
} // namespace
Status DetectExecutableType(const void* buffer,
size_t length,
ExecutableType* type,
size_t* detected_length) {
scoped_ptr<Disassembler> disassembler(DetectDisassembler(buffer, length));
if (!disassembler) { // We failed to detect anything.
*type = EXE_UNKNOWN;
*detected_length = 0;
return C_INPUT_NOT_RECOGNIZED;
}
*type = disassembler->kind();
*detected_length = disassembler->length();
return C_OK;
}
Status ParseDetectedExecutable(const void* buffer,
size_t length,
scoped_ptr<AssemblyProgram>* output) {
output->reset();
scoped_ptr<Disassembler> disassembler(DetectDisassembler(buffer, length));
if (!disassembler)
return C_INPUT_NOT_RECOGNIZED;
scoped_ptr<AssemblyProgram> program(
new AssemblyProgram(disassembler->kind()));
if (!disassembler->Disassemble(program.get()))
return C_DISASSEMBLY_FAILED;
if (!program->TrimLabels())
return C_TRIM_FAILED;
*output = std::move(program);
return C_OK;
}
} // namespace courgette
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