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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.
#ifndef COURGETTE_DISASSEMBLER_H_
#define COURGETTE_DISASSEMBLER_H_
#include <stddef.h>
#include <stdint.h>
#include "base/macros.h"
#include "courgette/courgette.h"
#include "courgette/image_utils.h"
namespace courgette {
class AssemblyProgram;
class Disassembler : public AddressTranslator {
public:
virtual ~Disassembler();
// AddressTranslator interfaces.
virtual RVA FileOffsetToRVA(FileOffset file_offset) const override = 0;
virtual FileOffset RVAToFileOffset(RVA rva) const override = 0;
const uint8_t* FileOffsetToPointer(FileOffset file_offset) const override;
const uint8_t* RVAToPointer(RVA rva) const override;
RVA PointerToTargetRVA(const uint8_t* p) const = 0;
virtual ExecutableType kind() const = 0;
// Returns true if the buffer appears to be a valid executable of the expected
// type, and false otherwise. This needs not be called before Disassemble().
virtual bool ParseHeader() = 0;
// Disassembles the item passed to the factory method into the output
// parameter 'program'.
virtual bool Disassemble(AssemblyProgram* program) = 0;
// ok() may always be called but returns true only after ParseHeader()
// succeeds.
bool ok() const { return failure_reason_ == nullptr; }
// Returns the length of the image. May reduce after ParseHeader().
size_t length() const { return length_; }
const uint8_t* start() const { return start_; }
const uint8_t* end() const { return end_; }
protected:
Disassembler(const void* start, size_t length);
bool Good();
bool Bad(const char *reason);
// Returns true if the array lies within our memory region.
bool IsArrayInBounds(size_t offset, size_t elements, size_t element_size) {
return offset <= length() && elements <= (length() - offset) / element_size;
}
// Reduce the length of the image in memory. Does not actually free
// (or realloc) any memory. Usually only called via ParseHeader().
void ReduceLength(size_t reduced_length);
private:
const char* failure_reason_;
//
// Basic information that is always valid after construction, although
// ParseHeader() may shorten |length_| if the executable is shorter than the
// total data.
//
size_t length_; // In current memory.
const uint8_t* start_; // In current memory, base for 'file offsets'.
const uint8_t* end_; // In current memory.
DISALLOW_COPY_AND_ASSIGN(Disassembler);
};
} // namespace courgette
#endif // COURGETTE_DISASSEMBLER_H_
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