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// compressed_output.h -- compressed output sections for gold  -*- C++ -*-

// Copyright 2007, 2008, 2010 Free Software Foundation, Inc.

// Written by Ian Lance Taylor <iant@google.com>.

// This file is part of gold.

// This program is free software; you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation; either version 3 of the License, or

// (at your option) any later version.

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License

// along with this program; if not, write to the Free Software

// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

// MA 02110-1301, USA.

// We support compressing .debug_* sections on output.  (And,

// potentially one day, other sections.)  This is a form of

// relaxation.  This file adds support for merging and emitting the

// compressed sections.

#ifndef GOLD_COMPRESSED_OUTPUT_H

#define GOLD_COMPRESSED_OUTPUT_H

#include <string>

#include "output.h"

namespace gold

{

class General_options;

// Read the compression header of a compressed debug section and return

// the uncompressed size.

extern uint64_t

get_uncompressed_size(const unsigned char*, section_size_type);

// Decompress a compressed debug section directly into the output file.

extern bool

decompress_input_section(const unsigned char*, unsigned long, unsigned char*,

                         unsigned long);

// This is used for a section whose data should be compressed.  It is

// a regular Output_section which computes its contents into a buffer

// and then postprocesses it.

class Output_compressed_section : public Output_section

{

 public:

  Output_compressed_section(const General_options* options,

                            const char* name, elfcpp::Elf_Word flags,

                            elfcpp::Elf_Xword type)

    : Output_section(name, flags, type),

      options_(options)

  { this->set_requires_postprocessing(); }

 protected:

  // Set the final data size.

  void

  set_final_data_size();

  // Write out the compressed contents.

  void

  do_write(Output_file*);

 private:

  // The options--this includes the compression type.

  const General_options* options_;

  // The compressed data.

  unsigned char* data_;

  // The new section name if we do compress.

  std::string new_section_name_;

};

} // End namespace gold.

#endif // !defined(GOLD_COMPRESSED_OUTPUT_H)