1 /* compress-debug.c - compress debug sections
2 Copyright (C) 2010-2016 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 *
compress_init(void)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
compress_data(struct z_stream_s * strm,const char ** next_in,int * avail_in,char ** next_out,int * avail_out)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
compress_finish(struct z_stream_s * strm,char ** next_out,int * avail_out,int * out_size)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