Merge from Chromium at DEPS revision r167172
This commit was generated by merge_to_master.py.
Change-Id: Ib8d56fd5ae39a2d7e8c91dcd76cc6d13f25f2aab
diff --git a/courgette/disassembler.h b/courgette/disassembler.h
new file mode 100644
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+++ b/courgette/disassembler.h
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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 "base/basictypes.h"
+
+#include "courgette/courgette.h"
+
+namespace courgette {
+
+class AssemblyProgram;
+
+// A Relative Virtual Address is the address in the image file after it is
+// loaded into memory relative to the image load address.
+typedef uint32 RVA;
+
+class Disassembler {
+ public:
+ virtual ~Disassembler();
+
+ virtual ExecutableType kind() { return EXE_UNKNOWN; }
+
+ // ok() may always be called but returns 'true' only after ParseHeader
+ // succeeds.
+ bool ok() const { return failure_reason_ == NULL; }
+
+ // Returns 'true' if the buffer appears to be a valid executable of the
+ // expected type. It is not required that this 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;
+
+ // Returns the length of the source executable. May reduce after ParseHeader.
+ size_t length() const { return length_; }
+ const uint8* start() const { return start_; }
+ const uint8* end() const { return end_; }
+
+ // Returns a pointer into the memory copy of the file format.
+ // FileOffsetToPointer(0) returns a pointer to the start of the file format.
+ const uint8* OffsetToPointer(size_t offset) const;
+
+ protected:
+ Disassembler(const void* start, size_t length);
+
+ bool Good();
+ bool Bad(const char *reason);
+
+ // These helper functions avoid the need for casts in the main code.
+ uint16 ReadU16(const uint8* address, size_t offset) {
+ return *reinterpret_cast<const uint16*>(address + offset);
+ }
+
+ uint32 ReadU32(const uint8* address, size_t offset) {
+ return *reinterpret_cast<const uint32*>(address + offset);
+ }
+
+ uint64 ReadU64(const uint8* address, size_t offset) {
+ return *reinterpret_cast<const uint64*>(address + offset);
+ }
+
+ static uint32 Read32LittleEndian(const void* address) {
+ return *reinterpret_cast<const uint32*>(address);
+ }
+
+ // 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, though
+ // ParseHeader may shorten the length if the executable is shorter than
+ // the total data.
+ //
+ size_t length_; // In current memory.
+ const uint8* start_; // In current memory, base for 'file offsets'.
+ const uint8* end_; // In current memory.
+
+ DISALLOW_COPY_AND_ASSIGN(Disassembler);
+};
+
+} // namespace courgette
+#endif // COURGETTE_DISASSEMBLER_H_