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/*
TiMidity++ -- MIDI to WAVE converter and player
Copyright (C) 1999-2002 Masanao Izumo <mo@goice.co.jp>
Copyright (C) 1995 Tuukka Toivonen <tt@cgs.fi>
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>
#include <stdlib.h>
#include "timidity.h"
#include "url.h"
#include "memb.h"
typedef struct _URL_cache
{
char common[sizeof(struct _URL)];
URL reader;
int memb_ok;
MemBuffer b;
long pos;
int autoclose;
} URL_cache;
static long url_cache_read(URL url, void *buff, long n);
static int url_cache_fgetc(URL url);
static long url_cache_seek(URL url, long offset, int whence);
static long url_cache_tell(URL url);
static void url_cache_close(URL url);
URL url_cache_open(URL url, int autoclose)
{
URL_cache *urlp;
if(url->type == URL_cache_t && autoclose)
{
if(((URL_cache *)url)->memb_ok)
delete_memb(&((URL_cache *)url)->b);
urlp = (URL_cache *)url;
url = urlp->reader;
}
else
{
if((urlp = (URL_cache *)alloc_url(sizeof(URL_cache))) == NULL)
{
if(autoclose)
url_close(url);
return NULL;
}
}
/* common members */
URLm(urlp, type) = URL_cache_t;
URLm(urlp, url_read) = url_cache_read;
URLm(urlp, url_gets) = NULL;
URLm(urlp, url_fgetc) = url_cache_fgetc;
URLm(urlp, url_seek) = url_cache_seek;
URLm(urlp, url_tell) = url_cache_tell;
URLm(urlp, url_close) = url_cache_close;
/* private members */
urlp->reader = url;
urlp->memb_ok = 1;
init_memb(&urlp->b);
urlp->pos = 0;
urlp->autoclose = autoclose;
return (URL)urlp;
}
void url_cache_disable(URL url)
{
if(url->type == URL_cache_t)
url->url_seek = NULL;
}
void url_cache_detach(URL url)
{
if(url != NULL && url->type == URL_cache_t)
{
URL_cache *urlp = (URL_cache *)url;
if(urlp->autoclose && urlp->reader != NULL)
url_close(urlp->reader);
urlp->reader = NULL;
}
}
static long url_cache_read(URL url, void *buff, long n)
{
URL_cache *urlp = (URL_cache *)url;
MemBuffer *b = &urlp->b;
if(!urlp->memb_ok)
{
if(urlp->reader == NULL)
return 0;
n = url_read(urlp->reader, buff, n);
if(n > 0)
urlp->pos += n;
return n;
}
if(urlp->pos < b->total_size)
{
if(n > b->total_size - urlp->pos)
n = b->total_size - urlp->pos;
urlp->pos += read_memb(b, buff, n);
return n;
}
if(url->url_seek == NULL)
{
delete_memb(b);
urlp->memb_ok = 0;
if(urlp->reader == NULL)
return 0;
n = url_read(urlp->reader, buff, n);
if(n > 0)
urlp->pos += n;
return n;
}
if(urlp->reader == NULL)
return 0;
n = url_read(urlp->reader, buff, n);
if(n > 0)
{
push_memb(b, buff, n);
b->cur = b->tail;
b->cur->pos = b->cur->size;
urlp->pos += n;
}
return n;
}
static int url_cache_fgetc(URL url)
{
URL_cache *urlp = (URL_cache *)url;
MemBuffer *b = &urlp->b;
char c;
int i;
if(!urlp->memb_ok)
{
if(urlp->reader == NULL)
return EOF;
if((i = url_getc(urlp->reader)) == EOF)
return EOF;
urlp->pos++;
return i;
}
if(urlp->pos < b->total_size)
{
read_memb(b, &c, 1);
urlp->pos++;
return (int)(unsigned char)c;
}
if(url->url_seek == NULL)
{
delete_memb(b);
urlp->memb_ok = 0;
if(urlp->reader == NULL)
return EOF;
if((i = url_getc(urlp->reader)) == EOF)
return EOF;
urlp->pos++;
return i;
}
if(urlp->reader == NULL)
return EOF;
if((i = url_getc(urlp->reader)) == EOF)
return EOF;
c = (char)i;
push_memb(b, &c, 1);
b->cur = b->tail;
b->cur->pos = b->cur->size;
urlp->pos++;
return i;
}
static long url_cache_seek(URL url, long offset, int whence)
{
URL_cache *urlp = (URL_cache *)url;
MemBuffer *b = &urlp->b;
long ret, newpos, n, s;
ret = urlp->pos;
switch(whence)
{
case SEEK_SET:
newpos = offset;
break;
case SEEK_CUR:
newpos = ret + offset;
break;
case SEEK_END:
while(url_cache_fgetc(url) != EOF)
;
newpos = b->total_size + whence;
break;
default:
url_errno = errno = EPERM;
return -1;
}
if(newpos < 0)
newpos = 0;
n = newpos - ret;
if(n < 0)
{
rewind_memb(b);
n = newpos;
urlp->pos = 0;
}
s = skip_read_memb(b, n);
urlp->pos += s;
while(s++ < n && url_cache_fgetc(url) != EOF)
;
return ret;
}
static long url_cache_tell(URL url)
{
return ((URL_cache *)url)->pos;
}
static void url_cache_close(URL url)
{
URL_cache *urlp = (URL_cache *)url;
if(urlp->autoclose && urlp->reader != NULL)
url_close(urlp->reader);
if(urlp->memb_ok)
delete_memb(&urlp->b);
free(urlp);
}
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