1*fae548d3Szrj /* compress-debug.c - compress debug sections
2*fae548d3Szrj Copyright (C) 2010-2020 Free Software Foundation, Inc.
3*fae548d3Szrj
4*fae548d3Szrj This file is part of GAS, the GNU Assembler.
5*fae548d3Szrj
6*fae548d3Szrj GAS is free software; you can redistribute it and/or modify
7*fae548d3Szrj it under the terms of the GNU General Public License as published by
8*fae548d3Szrj the Free Software Foundation; either version 3, or (at your option)
9*fae548d3Szrj any later version.
10*fae548d3Szrj
11*fae548d3Szrj GAS is distributed in the hope that it will be useful,
12*fae548d3Szrj but WITHOUT ANY WARRANTY; without even the implied warranty of
13*fae548d3Szrj MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*fae548d3Szrj GNU General Public License for more details.
15*fae548d3Szrj
16*fae548d3Szrj You should have received a copy of the GNU General Public License
17*fae548d3Szrj along with GAS; see the file COPYING. If not, write to the Free
18*fae548d3Szrj Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
19*fae548d3Szrj 02110-1301, USA. */
20*fae548d3Szrj
21*fae548d3Szrj #include "config.h"
22*fae548d3Szrj #include <stdio.h>
23*fae548d3Szrj #include <zlib.h>
24*fae548d3Szrj #include "ansidecl.h"
25*fae548d3Szrj #include "compress-debug.h"
26*fae548d3Szrj
27*fae548d3Szrj /* Initialize the compression engine. */
28*fae548d3Szrj
29*fae548d3Szrj struct z_stream_s *
compress_init(void)30*fae548d3Szrj compress_init (void)
31*fae548d3Szrj {
32*fae548d3Szrj static struct z_stream_s strm;
33*fae548d3Szrj
34*fae548d3Szrj strm.zalloc = NULL;
35*fae548d3Szrj strm.zfree = NULL;
36*fae548d3Szrj strm.opaque = NULL;
37*fae548d3Szrj deflateInit (&strm, Z_DEFAULT_COMPRESSION);
38*fae548d3Szrj return &strm;
39*fae548d3Szrj }
40*fae548d3Szrj
41*fae548d3Szrj /* Stream the contents of a frag to the compression engine. Output
42*fae548d3Szrj from the engine goes into the current frag on the obstack. */
43*fae548d3Szrj
44*fae548d3Szrj int
compress_data(struct z_stream_s * strm,const char ** next_in,int * avail_in,char ** next_out,int * avail_out)45*fae548d3Szrj compress_data (struct z_stream_s *strm, const char **next_in,
46*fae548d3Szrj int *avail_in, char **next_out, int *avail_out)
47*fae548d3Szrj {
48*fae548d3Szrj int out_size = 0;
49*fae548d3Szrj int x;
50*fae548d3Szrj
51*fae548d3Szrj strm->next_in = (Bytef *) (*next_in);
52*fae548d3Szrj strm->avail_in = *avail_in;
53*fae548d3Szrj strm->next_out = (Bytef *) (*next_out);
54*fae548d3Szrj strm->avail_out = *avail_out;
55*fae548d3Szrj
56*fae548d3Szrj x = deflate (strm, Z_NO_FLUSH);
57*fae548d3Szrj if (x != Z_OK)
58*fae548d3Szrj return -1;
59*fae548d3Szrj
60*fae548d3Szrj out_size = *avail_out - strm->avail_out;
61*fae548d3Szrj *next_in = (char *) (strm->next_in);
62*fae548d3Szrj *avail_in = strm->avail_in;
63*fae548d3Szrj *next_out = (char *) (strm->next_out);
64*fae548d3Szrj *avail_out = strm->avail_out;
65*fae548d3Szrj
66*fae548d3Szrj return out_size;
67*fae548d3Szrj }
68*fae548d3Szrj
69*fae548d3Szrj /* Finish the compression and consume the remaining compressed output.
70*fae548d3Szrj Returns -1 for error, 0 when done, 1 when more output buffer is
71*fae548d3Szrj needed. */
72*fae548d3Szrj
73*fae548d3Szrj int
compress_finish(struct z_stream_s * strm,char ** next_out,int * avail_out,int * out_size)74*fae548d3Szrj compress_finish (struct z_stream_s *strm, char **next_out,
75*fae548d3Szrj int *avail_out, int *out_size)
76*fae548d3Szrj {
77*fae548d3Szrj int x;
78*fae548d3Szrj
79*fae548d3Szrj strm->avail_in = 0;
80*fae548d3Szrj strm->next_out = (Bytef *) (*next_out);
81*fae548d3Szrj strm->avail_out = *avail_out;
82*fae548d3Szrj
83*fae548d3Szrj x = deflate (strm, Z_FINISH);
84*fae548d3Szrj
85*fae548d3Szrj *out_size = *avail_out - strm->avail_out;
86*fae548d3Szrj *next_out = (char *) (strm->next_out);
87*fae548d3Szrj *avail_out = strm->avail_out;
88*fae548d3Szrj
89*fae548d3Szrj if (x == Z_STREAM_END)
90*fae548d3Szrj {
91*fae548d3Szrj deflateEnd (strm);
92*fae548d3Szrj return 0;
93*fae548d3Szrj }
94*fae548d3Szrj if (strm->avail_out != 0)
95*fae548d3Szrj return -1;
96*fae548d3Szrj return 1;
97*fae548d3Szrj }
98