1 /* compress-debug.c - compress debug sections 2 Copyright (C) 2010-2014 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 "ansidecl.h" 24 #include "compress-debug.h" 25 26 #ifdef HAVE_ZLIB_H 27 #include <zlib.h> 28 #endif 29 30 /* Initialize the compression engine. */ 31 32 struct z_stream_s * 33 compress_init (void) 34 { 35 #ifndef HAVE_ZLIB_H 36 return NULL; 37 #else 38 static struct z_stream_s strm; 39 40 strm.zalloc = NULL; 41 strm.zfree = NULL; 42 strm.opaque = NULL; 43 deflateInit (&strm, Z_DEFAULT_COMPRESSION); 44 return &strm; 45 #endif /* HAVE_ZLIB_H */ 46 } 47 48 /* Stream the contents of a frag to the compression engine. Output 49 from the engine goes into the current frag on the obstack. */ 50 51 int 52 compress_data (struct z_stream_s *strm ATTRIBUTE_UNUSED, 53 const char **next_in ATTRIBUTE_UNUSED, 54 int *avail_in ATTRIBUTE_UNUSED, 55 char **next_out ATTRIBUTE_UNUSED, 56 int *avail_out ATTRIBUTE_UNUSED) 57 { 58 #ifndef HAVE_ZLIB_H 59 return -1; 60 #else 61 int out_size = 0; 62 int x; 63 64 strm->next_in = (Bytef *) (*next_in); 65 strm->avail_in = *avail_in; 66 strm->next_out = (Bytef *) (*next_out); 67 strm->avail_out = *avail_out; 68 69 x = deflate (strm, Z_NO_FLUSH); 70 if (x != Z_OK) 71 return -1; 72 73 out_size = *avail_out - strm->avail_out; 74 *next_in = (char *) (strm->next_in); 75 *avail_in = strm->avail_in; 76 *next_out = (char *) (strm->next_out); 77 *avail_out = strm->avail_out; 78 79 return out_size; 80 #endif /* HAVE_ZLIB_H */ 81 } 82 83 /* Finish the compression and consume the remaining compressed output. 84 Returns -1 for error, 0 when done, 1 when more output buffer is 85 needed. */ 86 87 int 88 compress_finish (struct z_stream_s *strm ATTRIBUTE_UNUSED, 89 char **next_out ATTRIBUTE_UNUSED, 90 int *avail_out ATTRIBUTE_UNUSED, 91 int *out_size ATTRIBUTE_UNUSED) 92 { 93 #ifndef HAVE_ZLIB_H 94 return -1; 95 #else 96 int x; 97 98 strm->avail_in = 0; 99 strm->next_out = (Bytef *) (*next_out); 100 strm->avail_out = *avail_out; 101 102 x = deflate (strm, Z_FINISH); 103 104 *out_size = *avail_out - strm->avail_out; 105 *next_out = (char *) (strm->next_out); 106 *avail_out = strm->avail_out; 107 108 if (x == Z_STREAM_END) 109 { 110 deflateEnd (strm); 111 return 0; 112 } 113 if (strm->avail_out != 0) 114 return -1; 115 return 1; 116 #endif /* HAVE_ZLIB_H */ 117 } 118
