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/* compress-debug.c - compress debug sections
Copyright (C) 2010-2017 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "config.h"
#include <stdio.h>
#include <zlib.h>
#include "ansidecl.h"
#include "compress-debug.h"
/* Initialize the compression engine. */
struct z_stream_s *
compress_init (void)
{
static struct z_stream_s strm;
strm.zalloc = NULL;
strm.zfree = NULL;
strm.opaque = NULL;
deflateInit (&strm, Z_DEFAULT_COMPRESSION);
return &strm;
}
/* Stream the contents of a frag to the compression engine. Output
from the engine goes into the current frag on the obstack. */
int
compress_data (struct z_stream_s *strm, const char **next_in,
int *avail_in, char **next_out, int *avail_out)
{
int out_size = 0;
int x;
strm->next_in = (Bytef *) (*next_in);
strm->avail_in = *avail_in;
strm->next_out = (Bytef *) (*next_out);
strm->avail_out = *avail_out;
x = deflate (strm, Z_NO_FLUSH);
if (x != Z_OK)
return -1;
out_size = *avail_out - strm->avail_out;
*next_in = (char *) (strm->next_in);
*avail_in = strm->avail_in;
*next_out = (char *) (strm->next_out);
*avail_out = strm->avail_out;
return out_size;
}
/* Finish the compression and consume the remaining compressed output.
Returns -1 for error, 0 when done, 1 when more output buffer is
needed. */
int
compress_finish (struct z_stream_s *strm, char **next_out,
int *avail_out, int *out_size)
{
int x;
strm->avail_in = 0;
strm->next_out = (Bytef *) (*next_out);
strm->avail_out = *avail_out;
x = deflate (strm, Z_FINISH);
*out_size = *avail_out - strm->avail_out;
*next_out = (char *) (strm->next_out);
*avail_out = strm->avail_out;
if (x == Z_STREAM_END)
{
deflateEnd (strm);
return 0;
}
if (strm->avail_out != 0)
return -1;
return 1;
}
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