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/* fmfconv_compr.c: Convert .fmf movie files - zlib compression routines
Copyright (c) 2004-2015 Gergely Szasz
Copyright (c) 2014-2016 Sergio Baldovi
This program 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 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; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: szaszg@hu.inter.net
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "fmfconv_compr.h"
#ifdef HAVE_ZLIB_H
#include <zlib.h>
#define ZBUF_SIZE 1024
#define ZBUF_INP_SIZE 512
z_stream zstream; /* zlib struct */
unsigned char zbuf_o[ZBUF_SIZE]; /* zlib output buffer */
unsigned char zbuf_i[ZBUF_INP_SIZE]; /* zlib input buffer */
int fmf_compr_feof = 0;
#endif
/* fmf variables */
int fmf_compr = 0; /* fmf compressed or not */
#ifdef HAVE_ZLIB_H
void
fmf_compr_init( void )
{
zstream.zalloc = Z_NULL;
zstream.zfree = Z_NULL;
zstream.opaque = Z_NULL;
zstream.avail_in = 0;
zstream.next_in = Z_NULL;
inflateInit( &zstream );
zstream.avail_out = ZBUF_SIZE;
}
void
fmf_compr_end( void )
{
inflateEnd( &zstream );
}
int
feof_compr( FILE *f )
{
if( fmf_compr ) {
if( fmf_compr_feof )
return 1;
if( zstream.avail_in > 0 || zstream.avail_out != ZBUF_SIZE )
return 0;
fmf_compr_feof = feof( f );
return fmf_compr_feof;
} else {
return feof( f );
}
}
int
fgetc_compr( FILE *f )
{
int s;
if( fmf_compr ) {
if( zstream.avail_out == ZBUF_SIZE ) {
zstream.next_out = zbuf_o;
do {
if( zstream.avail_in == 0 && !fmf_compr_feof ) {
zstream.avail_in = fread( zbuf_i, 1, ZBUF_INP_SIZE, f );
zstream.next_in = zbuf_i;
if( zstream.avail_in == 0 )
fmf_compr_feof = 1;
}
s = inflate( &zstream, fmf_compr_feof ? Z_FINISH : Z_SYNC_FLUSH );
} while ( zstream.avail_out != 0 && s == Z_OK );
zstream.next_out = zbuf_o;
}
if( zstream.avail_out == ZBUF_SIZE ) /* end of file */
return -1;
zstream.avail_out++;
return *( zstream.next_out++ ); /* !!! we use it for own purpose */
} else {
return fgetc( f );
}
}
int
fread_compr( void *buff, size_t n, size_t m, FILE *f )
{
size_t i;
int d;
char *b = buff;
if( fmf_compr ) {
for( i = n * m; i > 0; i-- ) {
if( ( d = fgetc_compr( f ) ) == -1 ) /****FIXME may too slow */
return ( n * m - i ) / n;
*b++ = d;
}
return m;
} else {
return fread( b, n, m, f );
}
}
#endif /* HAVE_ZLIB_H */
int
fget_word(FILE *input)
{
return fgetc_compr(input) + (fgetc_compr(input) << 8);
}
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