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/* compress.c --
This file is part of the lzop file compressor.
Copyright (C) 1996-2010 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
lzop and the LZO library are free software; you can redistribute them
and/or modify them under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program 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; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzop/
*/
#include "conf.h"
/*************************************************************************
//
**************************************************************************/
int x_set_method(int m, int l)
{
int r = -1;
#if defined(WITH_LZO)
r = lzo_set_method(m,l);
if (r >= 0)
return r;
#endif
#if defined(WITH_NRV)
r = nrv_set_method(m,l);
if (r >= 0)
return r;
#endif
#if defined(WITH_ZLIB)
r = zlib_set_method(m,l);
if (r >= 0)
return r;
#endif
UNUSED(r);
return -1;
}
int x_get_method(header_t *h)
{
int r = -1;
#if defined(WITH_LZO)
r = lzo_get_method(h);
if (r >= 0)
return r;
#endif
#if defined(WITH_NRV)
r = nrv_get_method(h);
if (r >= 0)
return r;
#endif
#if defined(WITH_ZLIB)
r = zlib_get_method(h);
if (r >= 0)
return 0;
#endif
UNUSED(r);
return 14;
}
/*************************************************************************
// memory setup
**************************************************************************/
lzo_bool x_enter(const header_t *h)
{
if (h == NULL)
{
lzo_bool ok = 1;
#if defined(WITH_LZO)
ok &= lzo_enter(NULL);
#endif
#if defined(WITH_NRV)
ok &= nrv_enter(NULL);
#endif
#if defined(WITH_ZLIB)
ok &= zlib_enter(NULL);
#endif
return ok;
}
switch (h->method)
{
#if defined(WITH_LZO)
case M_LZO1X_1:
case M_LZO1X_1_15:
case M_LZO1X_999:
return lzo_enter(h);
#endif
#if defined(WITH_NRV)
case M_NRV1A:
case M_NRV1B:
case M_NRV2A:
case M_NRV2B:
return nrv_enter(h);
#endif
#if defined(WITH_ZLIB)
case M_ZLIB:
return zlib_enter(h);
#endif
}
return 0;
}
void x_leave(const header_t *h)
{
if (h == NULL)
{
#if defined(WITH_ZLIB)
zlib_leave(NULL);
#endif
#if defined(WITH_NRV)
nrv_leave(NULL);
#endif
#if defined(WITH_LZO)
lzo_leave(NULL);
#endif
return;
}
switch (h->method)
{
#if defined(WITH_LZO)
case M_LZO1X_1:
case M_LZO1X_1_15:
case M_LZO1X_999:
lzo_leave(h);
break;
#endif
#if defined(WITH_NRV)
case M_NRV1A:
case M_NRV1B:
case M_NRV2A:
case M_NRV2B:
nrv_leave(h);
break;
#endif
#if defined(WITH_ZLIB)
case M_ZLIB:
zlib_leave(h);
break;
#endif
}
}
/*************************************************************************
// compress a file
**************************************************************************/
lzo_bool x_compress(file_t *fip, file_t *fop, header_t *h)
{
lzo_bool ok = 0;
init_compress_header(h,fip,fop);
switch (h->method)
{
#if defined(WITH_LZO)
case M_LZO1X_1:
case M_LZO1X_1_15:
case M_LZO1X_999:
lzo_init_compress_header(h);
break;
#endif
#if defined(WITH_NRV)
case M_NRV1A:
case M_NRV1B:
case M_NRV2A:
case M_NRV2B:
nrv_init_compress_header(h);
break;
#endif
#if defined(WITH_ZLIB)
case M_ZLIB:
zlib_init_compress_header(h);
break;
#endif
default:
fatal(fip,"Internal error");
break;
}
if (!x_enter(h))
e_memory();
if (opt_verbose > 1)
{
if (opt_unlink)
fprintf(con_term,"replacing %s with %s", fip->name, fop->name);
else
fprintf(con_term,"compressing %s into %s", fip->name, fop->name);
fflush(con_term);
set_err_nl(1);
}
write_header(fop,h);
fip->bytes_processed = fop->bytes_processed = 0;
switch (h->method)
{
#if defined(WITH_LZO)
case M_LZO1X_1:
case M_LZO1X_1_15:
case M_LZO1X_999:
ok = lzo_compress(fip,fop,h);
break;
#endif
#if defined(WITH_NRV)
case M_NRV1A:
case M_NRV1B:
case M_NRV2A:
case M_NRV2B:
ok = nrv_compress(fip,fop,h);
break;
#endif
#if defined(WITH_ZLIB)
case M_ZLIB:
ok = zlib_compress(fip,fop,h);
break;
#endif
default:
fatal(fip,"Internal error");
ok = 0;
break;
}
if (opt_cmd == CMD_COMPRESS && opt_verbose > 1)
{
fprintf(con_term, ok ? "\n" : " FAILED\n");
fflush(con_term);
}
set_err_nl(0);
x_leave(h);
return ok;
}
/*************************************************************************
// decompress a file
**************************************************************************/
lzo_bool x_decompress(file_t *fip, file_t *fop,
const header_t *h, lzo_bool skip)
{
lzo_bool ok = 0;
if (!x_enter(h))
e_memory();
if (skip)
{
assert(opt_cmd != CMD_TEST);
assert(fop->fd < 0);
if (opt_cmd == CMD_DECOMPRESS && opt_verbose > 0)
fprintf(con_term,"skipping %s [%s]", fip->name, fop->name);
fflush(con_term);
set_err_nl(1);
}
else if (opt_cmd == CMD_DECOMPRESS && opt_verbose > 1)
{
if (opt_unlink)
fprintf(con_term,"restoring %s into %s", fip->name, fop->name);
else
fprintf(con_term,"decompressing %s into %s", fip->name, fop->name);
fflush(con_term);
set_err_nl(1);
}
else if (opt_cmd == CMD_TEST && opt_verbose > 0)
{
/* note: gzip is quiet by default when testing, lzop is not */
if (opt_verbose > 2)
fprintf(con_term,"testing %s [%s]", fip->name, fop->name);
else
fprintf(con_term,"testing %s", fip->name);
fflush(con_term);
set_err_nl(1);
}
fip->bytes_processed = fop->bytes_processed = 0;
switch (h->method)
{
#if defined(WITH_LZO)
case M_LZO1X_1:
case M_LZO1X_1_15:
case M_LZO1X_999:
ok = lzo_decompress(fip,fop,h,skip);
break;
#endif
#if defined(WITH_NRV)
case M_NRV1A:
case M_NRV1B:
case M_NRV2A:
case M_NRV2B:
ok = nrv_decompress(fip,fop,h,skip);
break;
#endif
#if defined(WITH_ZLIB)
case M_ZLIB:
ok = zlib_decompress(fip,fop,h,skip);
break;
#endif
default:
fatal(fip,"Internal error");
ok = 0;
break;
}
if (skip && opt_cmd == CMD_DECOMPRESS && opt_verbose > 0)
{
fprintf(con_term, ok ? "\n" : " FAILED\n");
fflush(con_term);
}
else if (opt_cmd == CMD_DECOMPRESS && opt_verbose > 1)
{
fprintf(con_term, ok ? "\n" : " FAILED\n");
fflush(con_term);
}
else if (opt_cmd == CMD_TEST && opt_verbose > 0)
{
fprintf(con_term, ok ? " OK\n" : " FAILED\n");
fflush(con_term);
}
set_err_nl(0);
if (ok && opt_cmd == CMD_TEST)
do_test(h,fop->bytes_processed,fip->bytes_processed);
if (ok && opt_cmd == CMD_LIST)
do_list(h,fop->bytes_processed,fip->bytes_processed);
if (ok && opt_cmd == CMD_LS)
do_ls(h,fop->bytes_processed,fip->bytes_processed);
if (ok && opt_cmd == CMD_INFO)
do_info(h,fop->bytes_processed,fip->bytes_processed);
x_leave(h);
return ok;
}
/*************************************************************************
//
**************************************************************************/
void x_filter(lzo_bytep p, lzo_uint l, const header_t *h)
{
unsigned f = (unsigned) h->filter;
lzo_bool c = (opt_cmd == CMD_COMPRESS);
if (f == 0 || l <= 0)
return;
if (f == 1)
{
if (c) t_sub1(p,l); else t_add1(p,l);
}
else if (f <= 16)
{
if (c) t_sub(p,l,f); else t_add(p,l,f);
}
else
{
fatal(NULL,"Invalid filter");
}
}
/*
vi:ts=4:et
*/
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