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/* bunzip2 decompression
Copyright (C) 2014 Free Software Foundation, Inc.
Written by Ignazio Sgalmuzzo <ignaker@gmail.com>
This file is part of the GNU Hurd.
The GNU Hurd 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 2, or (at
your option) any later version.
The GNU Hurd 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <bzlib.h>
/* I/O interface */
extern int (*unzip_read) (char *buf, size_t maxread);
extern void (*unzip_write) (const char *buf, size_t nwrite);
extern void (*unzip_read_error) (void);
extern void (*unzip_error) (const char *msg);
/* bzip2 doesn't require window sliding. Just for buffering. */
#define INBUFSIZ 0x1000
#define OUTBUFSIZ 0x1000
static char inbuf[INBUFSIZ];
static char outbuf[OUTBUFSIZ];
#ifdef SMALL_BZIP2
#define SMALL_MODE 1
#else
#define SMALL_MODE 0
#endif
void
do_bunzip2 (void)
{
int result;
bz_stream strm;
strm.bzalloc = NULL;
strm.bzfree = NULL;
strm.opaque = NULL;
strm.avail_in = 0;
strm.next_out = outbuf;
strm.avail_out = OUTBUFSIZ;
result = BZ2_bzDecompressInit (&strm, 0, SMALL_MODE);
while (result == BZ_OK)
{
if (strm.avail_in == 0)
{
strm.next_in = inbuf;
strm.avail_in = (*unzip_read)(strm.next_in, INBUFSIZ);
if (strm.avail_in == 0)
break;
}
result = BZ2_bzDecompress (&strm);
if ((result != BZ_OK) && (result != BZ_STREAM_END))
break;
if ((strm.avail_out == 0) || (result == BZ_STREAM_END))
{
(*unzip_write) (outbuf, OUTBUFSIZ - strm.avail_out);
strm.next_out = outbuf;
strm.avail_out = OUTBUFSIZ;
}
}
BZ2_bzDecompressEnd (&strm);
if (result != BZ_STREAM_END)
(*unzip_error) (NULL);
}
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