1ed0d50c3Schristos /* compress-debug.c - compress debug sections
2*b88e3e88Schristos Copyright (C) 2010-2020 Free Software Foundation, Inc.
3ed0d50c3Schristos
4ed0d50c3Schristos This file is part of GAS, the GNU Assembler.
5ed0d50c3Schristos
6ed0d50c3Schristos GAS is free software; you can redistribute it and/or modify
7ed0d50c3Schristos it under the terms of the GNU General Public License as published by
8ed0d50c3Schristos the Free Software Foundation; either version 3, or (at your option)
9ed0d50c3Schristos any later version.
10ed0d50c3Schristos
11ed0d50c3Schristos GAS is distributed in the hope that it will be useful,
12ed0d50c3Schristos but WITHOUT ANY WARRANTY; without even the implied warranty of
13ed0d50c3Schristos MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14ed0d50c3Schristos GNU General Public License for more details.
15ed0d50c3Schristos
16ed0d50c3Schristos You should have received a copy of the GNU General Public License
17ed0d50c3Schristos along with GAS; see the file COPYING. If not, write to the Free
18ed0d50c3Schristos Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19ed0d50c3Schristos 02110-1301, USA. */
20ed0d50c3Schristos
21ed0d50c3Schristos #include "config.h"
22ed0d50c3Schristos #include <stdio.h>
23ed0d50c3Schristos #include <zlib.h>
24ed0d50c3Schristos #include "ansidecl.h"
25ed0d50c3Schristos #include "compress-debug.h"
26ed0d50c3Schristos
27ed0d50c3Schristos /* Initialize the compression engine. */
28ed0d50c3Schristos
29ed0d50c3Schristos struct z_stream_s *
compress_init(void)30ed0d50c3Schristos compress_init (void)
31ed0d50c3Schristos {
32ed0d50c3Schristos static struct z_stream_s strm;
33ed0d50c3Schristos
34ed0d50c3Schristos strm.zalloc = NULL;
35ed0d50c3Schristos strm.zfree = NULL;
36ed0d50c3Schristos strm.opaque = NULL;
37ed0d50c3Schristos deflateInit (&strm, Z_DEFAULT_COMPRESSION);
38ed0d50c3Schristos return &strm;
39ed0d50c3Schristos }
40ed0d50c3Schristos
41ed0d50c3Schristos /* Stream the contents of a frag to the compression engine. Output
42ed0d50c3Schristos from the engine goes into the current frag on the obstack. */
43ed0d50c3Schristos
44ed0d50c3Schristos int
compress_data(struct z_stream_s * strm,const char ** next_in,int * avail_in,char ** next_out,int * avail_out)45ed0d50c3Schristos compress_data (struct z_stream_s *strm, const char **next_in,
46ed0d50c3Schristos int *avail_in, char **next_out, int *avail_out)
47ed0d50c3Schristos {
48ed0d50c3Schristos int out_size = 0;
49ed0d50c3Schristos int x;
50ed0d50c3Schristos
51ed0d50c3Schristos strm->next_in = (Bytef *) (*next_in);
52ed0d50c3Schristos strm->avail_in = *avail_in;
53ed0d50c3Schristos strm->next_out = (Bytef *) (*next_out);
54ed0d50c3Schristos strm->avail_out = *avail_out;
55ed0d50c3Schristos
56ed0d50c3Schristos x = deflate (strm, Z_NO_FLUSH);
57ed0d50c3Schristos if (x != Z_OK)
58ed0d50c3Schristos return -1;
59ed0d50c3Schristos
60ed0d50c3Schristos out_size = *avail_out - strm->avail_out;
61ed0d50c3Schristos *next_in = (char *) (strm->next_in);
62ed0d50c3Schristos *avail_in = strm->avail_in;
63ed0d50c3Schristos *next_out = (char *) (strm->next_out);
64ed0d50c3Schristos *avail_out = strm->avail_out;
65ed0d50c3Schristos
66ed0d50c3Schristos return out_size;
67ed0d50c3Schristos }
68ed0d50c3Schristos
69ed0d50c3Schristos /* Finish the compression and consume the remaining compressed output.
70ed0d50c3Schristos Returns -1 for error, 0 when done, 1 when more output buffer is
71ed0d50c3Schristos needed. */
72ed0d50c3Schristos
73ed0d50c3Schristos int
compress_finish(struct z_stream_s * strm,char ** next_out,int * avail_out,int * out_size)74ed0d50c3Schristos compress_finish (struct z_stream_s *strm, char **next_out,
75ed0d50c3Schristos int *avail_out, int *out_size)
76ed0d50c3Schristos {
77ed0d50c3Schristos int x;
78ed0d50c3Schristos
79ed0d50c3Schristos strm->avail_in = 0;
80ed0d50c3Schristos strm->next_out = (Bytef *) (*next_out);
81ed0d50c3Schristos strm->avail_out = *avail_out;
82ed0d50c3Schristos
83ed0d50c3Schristos x = deflate (strm, Z_FINISH);
84ed0d50c3Schristos
85ed0d50c3Schristos *out_size = *avail_out - strm->avail_out;
86ed0d50c3Schristos *next_out = (char *) (strm->next_out);
87ed0d50c3Schristos *avail_out = strm->avail_out;
88ed0d50c3Schristos
89ed0d50c3Schristos if (x == Z_STREAM_END)
90ed0d50c3Schristos {
91ed0d50c3Schristos deflateEnd (strm);
92ed0d50c3Schristos return 0;
93ed0d50c3Schristos }
94ed0d50c3Schristos if (strm->avail_out != 0)
95ed0d50c3Schristos return -1;
96ed0d50c3Schristos return 1;
97ed0d50c3Schristos }
98