1 /* compress-debug.c - compress debug sections 2 Copyright (C) 2010-2020 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 * 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 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 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