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/* compress-debug.c - compress debug sections
Copyright (C) 2010-2025 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 <string.h>
#include <zlib.h>
#if HAVE_ZSTD
#include <zstd.h>
#endif
#include "ansidecl.h"
#include "compress-debug.h"
/* Initialize the compression engine. */
void *
compress_init (bool use_zstd)
{
if (use_zstd) {
#if HAVE_ZSTD
return ZSTD_createCCtx ();
#endif
}
static struct z_stream_s strm;
memset (&strm, 0, sizeof (strm));
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 (bool use_zstd, void *ctx, const char **next_in, int *avail_in,
char **next_out, int *avail_out)
{
if (use_zstd)
{
#if HAVE_ZSTD
ZSTD_outBuffer ob = { *next_out, *avail_out, 0 };
ZSTD_inBuffer ib = { *next_in, *avail_in, 0 };
size_t ret = ZSTD_compressStream2 (ctx, &ob, &ib, ZSTD_e_continue);
*next_in += ib.pos;
*avail_in -= ib.pos;
*next_out += ob.pos;
*avail_out -= ob.pos;
if (ZSTD_isError (ret))
return -1;
return (int)ob.pos;
#endif
}
struct z_stream_s *strm = ctx;
strm->next_in = (Bytef *) (*next_in);
strm->avail_in = *avail_in;
strm->next_out = (Bytef *) (*next_out);
strm->avail_out = *avail_out;
int x = deflate (strm, Z_NO_FLUSH);
if (x != Z_OK)
return -1;
int 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 (bool use_zstd, void *ctx, char **next_out,
int *avail_out, int *out_size)
{
if (use_zstd)
{
#if HAVE_ZSTD
ZSTD_outBuffer ob = { *next_out, *avail_out, 0 };
ZSTD_inBuffer ib = { 0, 0, 0 };
size_t ret = ZSTD_compressStream2 (ctx, &ob, &ib, ZSTD_e_end);
*out_size = ob.pos;
*next_out += ob.pos;
*avail_out -= ob.pos;
if (ZSTD_isError (ret))
return -1;
if (ret == 0)
ZSTD_freeCCtx (ctx);
return ret ? 1 : 0;
#endif
}
int x;
struct z_stream_s *strm = ctx;
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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