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/* compress-debug.c - compress debug sections

   Copyright 2010 Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS 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, or (at your option)

   any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to the Free

   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA

   02110-1301, USA.  */

#include "config.h"

#include <stdio.h>

#include "ansidecl.h"

#include "compress-debug.h"

#ifdef HAVE_ZLIB_H

#include <zlib.h>

#endif

/* Initialize the compression engine.  */

struct z_stream_s *

compress_init (void)

{

#ifndef HAVE_ZLIB_H

  return NULL;

#else

  static struct z_stream_s strm;

  strm.zalloc = NULL;

  strm.zfree = NULL;

  strm.opaque = NULL;

  deflateInit (&strm, Z_DEFAULT_COMPRESSION);

  return &strm;

#endif /* HAVE_ZLIB_H */

}

/* Stream the contents of a frag to the compression engine.  Output

   from the engine goes into the current frag on the obstack.  */

int

compress_data (struct z_stream_s *strm ATTRIBUTE_UNUSED,

               const char **next_in ATTRIBUTE_UNUSED,

               int *avail_in ATTRIBUTE_UNUSED,

               char **next_out ATTRIBUTE_UNUSED,

               int *avail_out ATTRIBUTE_UNUSED)

{

#ifndef HAVE_ZLIB_H

  return -1;

#else

  int out_size = 0;

  int x;

  strm->next_in = (Bytef *) (*next_in);

  strm->avail_in = *avail_in;

  strm->next_out = (Bytef *) (*next_out);

  strm->avail_out = *avail_out;

  x = deflate (strm, Z_NO_FLUSH);

  if (x != Z_OK)

    return -1;

  out_size = *avail_out - strm->avail_out;

  *next_in = (char *) (strm->next_in);

  *avail_in = strm->avail_in;

  *next_out = (char *) (strm->next_out);

  *avail_out = strm->avail_out;

  return out_size;

#endif /* HAVE_ZLIB_H */

}

/* Finish the compression and consume the remaining compressed output.

   Returns -1 for error, 0 when done, 1 when more output buffer is

   needed.  */

int

compress_finish (struct z_stream_s *strm ATTRIBUTE_UNUSED,

                 char **next_out ATTRIBUTE_UNUSED,

                 int *avail_out ATTRIBUTE_UNUSED,

                 int *out_size ATTRIBUTE_UNUSED)

{

#ifndef HAVE_ZLIB_H

  return -1;

#else

  int x;

  strm->avail_in = 0;

  strm->next_out = (Bytef *) (*next_out);

  strm->avail_out = *avail_out;

  x = deflate (strm, Z_FINISH);

  *out_size = *avail_out - strm->avail_out;

  *next_out = (char *) (strm->next_out);

  *avail_out = strm->avail_out;

  if (x == Z_STREAM_END)

    {

      deflateEnd (strm);

      return 0;

    }

  if (strm->avail_out != 0)

    return -1;

  return 1;

#endif /* HAVE_ZLIB_H */

}