1*a9fa9459Szrj /* compress-debug.c - compress debug sections
2*a9fa9459Szrj Copyright (C) 2010-2016 Free Software Foundation, Inc.
3*a9fa9459Szrj
4*a9fa9459Szrj This file is part of GAS, the GNU Assembler.
5*a9fa9459Szrj
6*a9fa9459Szrj GAS is free software; you can redistribute it and/or modify
7*a9fa9459Szrj it under the terms of the GNU General Public License as published by
8*a9fa9459Szrj the Free Software Foundation; either version 3, or (at your option)
9*a9fa9459Szrj any later version.
10*a9fa9459Szrj
11*a9fa9459Szrj GAS is distributed in the hope that it will be useful,
12*a9fa9459Szrj but WITHOUT ANY WARRANTY; without even the implied warranty of
13*a9fa9459Szrj MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*a9fa9459Szrj GNU General Public License for more details.
15*a9fa9459Szrj
16*a9fa9459Szrj You should have received a copy of the GNU General Public License
17*a9fa9459Szrj along with GAS; see the file COPYING. If not, write to the Free
18*a9fa9459Szrj Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19*a9fa9459Szrj 02110-1301, USA. */
20*a9fa9459Szrj
21*a9fa9459Szrj #include "config.h"
22*a9fa9459Szrj #include <stdio.h>
23*a9fa9459Szrj #include <zlib.h>
24*a9fa9459Szrj #include "ansidecl.h"
25*a9fa9459Szrj #include "compress-debug.h"
26*a9fa9459Szrj
27*a9fa9459Szrj /* Initialize the compression engine. */
28*a9fa9459Szrj
29*a9fa9459Szrj struct z_stream_s *
compress_init(void)30*a9fa9459Szrj compress_init (void)
31*a9fa9459Szrj {
32*a9fa9459Szrj static struct z_stream_s strm;
33*a9fa9459Szrj
34*a9fa9459Szrj strm.zalloc = NULL;
35*a9fa9459Szrj strm.zfree = NULL;
36*a9fa9459Szrj strm.opaque = NULL;
37*a9fa9459Szrj deflateInit (&strm, Z_DEFAULT_COMPRESSION);
38*a9fa9459Szrj return &strm;
39*a9fa9459Szrj }
40*a9fa9459Szrj
41*a9fa9459Szrj /* Stream the contents of a frag to the compression engine. Output
42*a9fa9459Szrj from the engine goes into the current frag on the obstack. */
43*a9fa9459Szrj
44*a9fa9459Szrj int
compress_data(struct z_stream_s * strm,const char ** next_in,int * avail_in,char ** next_out,int * avail_out)45*a9fa9459Szrj compress_data (struct z_stream_s *strm, const char **next_in,
46*a9fa9459Szrj int *avail_in, char **next_out, int *avail_out)
47*a9fa9459Szrj {
48*a9fa9459Szrj int out_size = 0;
49*a9fa9459Szrj int x;
50*a9fa9459Szrj
51*a9fa9459Szrj strm->next_in = (Bytef *) (*next_in);
52*a9fa9459Szrj strm->avail_in = *avail_in;
53*a9fa9459Szrj strm->next_out = (Bytef *) (*next_out);
54*a9fa9459Szrj strm->avail_out = *avail_out;
55*a9fa9459Szrj
56*a9fa9459Szrj x = deflate (strm, Z_NO_FLUSH);
57*a9fa9459Szrj if (x != Z_OK)
58*a9fa9459Szrj return -1;
59*a9fa9459Szrj
60*a9fa9459Szrj out_size = *avail_out - strm->avail_out;
61*a9fa9459Szrj *next_in = (char *) (strm->next_in);
62*a9fa9459Szrj *avail_in = strm->avail_in;
63*a9fa9459Szrj *next_out = (char *) (strm->next_out);
64*a9fa9459Szrj *avail_out = strm->avail_out;
65*a9fa9459Szrj
66*a9fa9459Szrj return out_size;
67*a9fa9459Szrj }
68*a9fa9459Szrj
69*a9fa9459Szrj /* Finish the compression and consume the remaining compressed output.
70*a9fa9459Szrj Returns -1 for error, 0 when done, 1 when more output buffer is
71*a9fa9459Szrj needed. */
72*a9fa9459Szrj
73*a9fa9459Szrj int
compress_finish(struct z_stream_s * strm,char ** next_out,int * avail_out,int * out_size)74*a9fa9459Szrj compress_finish (struct z_stream_s *strm, char **next_out,
75*a9fa9459Szrj int *avail_out, int *out_size)
76*a9fa9459Szrj {
77*a9fa9459Szrj int x;
78*a9fa9459Szrj
79*a9fa9459Szrj strm->avail_in = 0;
80*a9fa9459Szrj strm->next_out = (Bytef *) (*next_out);
81*a9fa9459Szrj strm->avail_out = *avail_out;
82*a9fa9459Szrj
83*a9fa9459Szrj x = deflate (strm, Z_FINISH);
84*a9fa9459Szrj
85*a9fa9459Szrj *out_size = *avail_out - strm->avail_out;
86*a9fa9459Szrj *next_out = (char *) (strm->next_out);
87*a9fa9459Szrj *avail_out = strm->avail_out;
88*a9fa9459Szrj
89*a9fa9459Szrj if (x == Z_STREAM_END)
90*a9fa9459Szrj {
91*a9fa9459Szrj deflateEnd (strm);
92*a9fa9459Szrj return 0;
93*a9fa9459Szrj }
94*a9fa9459Szrj if (strm->avail_out != 0)
95*a9fa9459Szrj return -1;
96*a9fa9459Szrj return 1;
97*a9fa9459Szrj }
98