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  1. /* compress-debug.c - compress debug sections
  2.    Copyright (C) 2010-2015 Free Software Foundation, Inc.
  3.  
  4.    This file is part of GAS, the GNU Assembler.
  5.  
  6.    GAS is free software; you can redistribute it and/or modify
  7.    it under the terms of the GNU General Public License as published by
  8.    the Free Software Foundation; either version 3, or (at your option)
  9.    any later version.
  10.  
  11.    GAS is distributed in the hope that it will be useful,
  12.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.    GNU General Public License for more details.
  15.  
  16.    You should have received a copy of the GNU General Public License
  17.    along with GAS; see the file COPYING.  If not, write to the Free
  18.    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  19.    02110-1301, USA.  */
  20.  
  21. #include "config.h"
  22. #include <stdio.h>
  23. #include <zlib.h>
  24. #include "ansidecl.h"
  25. #include "compress-debug.h"
  26.  
  27. /* Initialize the compression engine.  */
  28.  
  29. struct z_stream_s *
  30. compress_init (void)
  31. {
  32.   static struct z_stream_s strm;
  33.  
  34.   strm.zalloc = NULL;
  35.   strm.zfree = NULL;
  36.   strm.opaque = NULL;
  37.   deflateInit (&strm, Z_DEFAULT_COMPRESSION);
  38.   return &strm;
  39. }
  40.  
  41. /* Stream the contents of a frag to the compression engine.  Output
  42.    from the engine goes into the current frag on the obstack.  */
  43.  
  44. int
  45. compress_data (struct z_stream_s *strm, const char **next_in,
  46.                int *avail_in, char **next_out, int *avail_out)
  47. {
  48.   int out_size = 0;
  49.   int x;
  50.  
  51.   strm->next_in = (Bytef *) (*next_in);
  52.   strm->avail_in = *avail_in;
  53.   strm->next_out = (Bytef *) (*next_out);
  54.   strm->avail_out = *avail_out;
  55.  
  56.   x = deflate (strm, Z_NO_FLUSH);
  57.   if (x != Z_OK)
  58.     return -1;
  59.  
  60.   out_size = *avail_out - strm->avail_out;
  61.   *next_in = (char *) (strm->next_in);
  62.   *avail_in = strm->avail_in;
  63.   *next_out = (char *) (strm->next_out);
  64.   *avail_out = strm->avail_out;
  65.  
  66.   return out_size;
  67. }
  68.  
  69. /* Finish the compression and consume the remaining compressed output.
  70.    Returns -1 for error, 0 when done, 1 when more output buffer is
  71.    needed.  */
  72.  
  73. int
  74. compress_finish (struct z_stream_s *strm, char **next_out,
  75.                  int *avail_out, int *out_size)
  76. {
  77.   int x;
  78.  
  79.   strm->avail_in = 0;
  80.   strm->next_out = (Bytef *) (*next_out);
  81.   strm->avail_out = *avail_out;
  82.  
  83.   x = deflate (strm, Z_FINISH);
  84.  
  85.   *out_size = *avail_out - strm->avail_out;
  86.   *next_out = (char *) (strm->next_out);
  87.   *avail_out = strm->avail_out;
  88.  
  89.   if (x == Z_STREAM_END)
  90.     {
  91.       deflateEnd (strm);
  92.       return 0;
  93.     }
  94.   if (strm->avail_out != 0)
  95.     return -1;
  96.   return 1;
  97. }
  98.