98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/* compress-debug.c - compress debug sections
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Copyright (C) 2010-2015 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "config.h"
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#include <stdio.h>
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#include <zlib.h>
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#include "ansidecl.h"
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#include "compress-debug.h"
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/* Initialize the compression engine. */
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struct z_stream_s *
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compress_init (void)
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{
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static struct z_stream_s strm;
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strm.zalloc = NULL;
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strm.zfree = NULL;
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strm.opaque = NULL;
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deflateInit (&strm, Z_DEFAULT_COMPRESSION);
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return &strm;
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}
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/* Stream the contents of a frag to the compression engine. Output
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from the engine goes into the current frag on the obstack. */
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int
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compress_data (struct z_stream_s *strm, const char **next_in,
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int *avail_in, char **next_out, int *avail_out)
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{
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int out_size = 0;
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int x;
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strm->next_in = (Bytef *) (*next_in);
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strm->avail_in = *avail_in;
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strm->next_out = (Bytef *) (*next_out);
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strm->avail_out = *avail_out;
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x = deflate (strm, Z_NO_FLUSH);
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if (x != Z_OK)
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return -1;
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out_size = *avail_out - strm->avail_out;
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*next_in = (char *) (strm->next_in);
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*avail_in = strm->avail_in;
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*next_out = (char *) (strm->next_out);
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*avail_out = strm->avail_out;
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return out_size;
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}
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/* Finish the compression and consume the remaining compressed output.
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Returns -1 for error, 0 when done, 1 when more output buffer is
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needed. */
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int
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compress_finish (struct z_stream_s *strm, char **next_out,
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int *avail_out, int *out_size)
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{
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int x;
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strm->avail_in = 0;
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strm->next_out = (Bytef *) (*next_out);
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strm->avail_out = *avail_out;
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x = deflate (strm, Z_FINISH);
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*out_size = *avail_out - strm->avail_out;
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*next_out = (char *) (strm->next_out);
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*avail_out = strm->avail_out;
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if (x == Z_STREAM_END)
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{
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deflateEnd (strm);
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return 0;
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}
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if (strm->avail_out != 0)
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return -1;
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return 1;
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}
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