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1 | /* compress-debug.c - compress debug sections |
2 | Copyright 2010 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 <stdio.h> | |
22 | ||
23 | #include "ansidecl.h" | |
24 | ||
25 | #include "config.h" | |
26 | #include "compress-debug.h" | |
27 | ||
28 | #ifdef HAVE_ZLIB_H | |
29 | #include <zlib.h> | |
30 | #endif | |
31 | ||
32 | /* Initialize the compression engine. */ | |
33 | ||
34 | struct z_stream_s * | |
35 | compress_init (void) | |
36 | { | |
37 | #ifndef HAVE_ZLIB_H | |
38 | return NULL; | |
39 | #else | |
40 | static struct z_stream_s strm; | |
41 | ||
42 | strm.zalloc = NULL; | |
43 | strm.zfree = NULL; | |
44 | strm.opaque = NULL; | |
45 | deflateInit (&strm, Z_DEFAULT_COMPRESSION); | |
46 | return &strm; | |
47 | #endif /* HAVE_ZLIB_H */ | |
48 | } | |
49 | ||
50 | /* Stream the contents of a frag to the compression engine. Output | |
51 | from the engine goes into the current frag on the obstack. */ | |
52 | ||
53 | int | |
54 | compress_data (struct z_stream_s *strm ATTRIBUTE_UNUSED, | |
55 | const char **next_in ATTRIBUTE_UNUSED, | |
56 | int *avail_in ATTRIBUTE_UNUSED, | |
57 | char **next_out ATTRIBUTE_UNUSED, | |
58 | int *avail_out ATTRIBUTE_UNUSED) | |
59 | { | |
60 | #ifndef HAVE_ZLIB_H | |
61 | return -1; | |
62 | #else | |
63 | int out_size = 0; | |
64 | int x; | |
65 | ||
66 | strm->next_in = (Bytef *) (*next_in); | |
67 | strm->avail_in = *avail_in; | |
68 | strm->next_out = (Bytef *) (*next_out); | |
69 | strm->avail_out = *avail_out; | |
70 | ||
71 | x = deflate (strm, Z_NO_FLUSH); | |
72 | if (x != Z_OK) | |
73 | return -1; | |
74 | ||
75 | out_size = *avail_out - strm->avail_out; | |
76 | *next_in = (char *) (strm->next_in); | |
77 | *avail_in = strm->avail_in; | |
78 | *next_out = (char *) (strm->next_out); | |
79 | *avail_out = strm->avail_out; | |
80 | ||
81 | return out_size; | |
82 | #endif /* HAVE_ZLIB_H */ | |
83 | } | |
84 | ||
85 | /* Finish the compression and consume the remaining compressed output. | |
86 | Returns -1 for error, 0 when done, 1 when more output buffer is | |
87 | needed. */ | |
88 | ||
89 | int | |
90 | compress_finish (struct z_stream_s *strm ATTRIBUTE_UNUSED, | |
91 | char **next_out ATTRIBUTE_UNUSED, | |
92 | int *avail_out ATTRIBUTE_UNUSED, | |
93 | int *out_size ATTRIBUTE_UNUSED) | |
94 | { | |
95 | #ifndef HAVE_ZLIB_H | |
96 | return -1; | |
97 | #else | |
98 | int x; | |
99 | ||
100 | strm->avail_in = 0; | |
101 | strm->next_out = (Bytef *) (*next_out); | |
102 | strm->avail_out = *avail_out; | |
103 | ||
104 | x = deflate (strm, Z_FINISH); | |
105 | ||
106 | *out_size = *avail_out - strm->avail_out; | |
107 | *next_out = (char *) (strm->next_out); | |
108 | *avail_out = strm->avail_out; | |
109 | ||
110 | if (x == Z_STREAM_END) | |
111 | { | |
112 | deflateEnd (strm); | |
113 | return 0; | |
114 | } | |
115 | if (strm->avail_out != 0) | |
116 | return -1; | |
117 | return 1; | |
118 | #endif /* HAVE_ZLIB_H */ | |
119 | } |