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/* Copyright (c) 2002-2003 krzYszcz and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* generic helpers for binary file reading and writing */
#ifdef NT
#include <io.h>
#else
#include <unistd.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "m_pd.h"
#include "shared.h"
#include "common/bifi.h"
#if 1
#define BIFI_VERBOSE
#if 0
#define BIFI_DEBUG
#endif
#endif
static int bifi_swapping = 1; /* set in bifi_clear() */
/* one helper from g_array.c (the original is global, but since
garray_ambigendian() lacks EXTERN specifier, .dll externs cannot see it;
btw. it has a comment: ``this should be renamed and moved...'')
*/
static int ambigendian(void)
{
unsigned short s = 1;
unsigned char c = *(char *)(&s);
return (c==0);
}
/* two helpers from d_soundfile.c */
uint32 bifi_swap4(uint32 n)
{
if (bifi_swapping)
return (((n & 0xff) << 24) | ((n & 0xff00) << 8) |
((n & 0xff0000) >> 8) | ((n & 0xff000000) >> 24));
else return (n);
}
uint16 bifi_swap2(uint16 n)
{
if (bifi_swapping)
return (((n & 0xff) << 8) | ((n & 0xff00) >> 8));
else return (n);
}
static void bifi_error_clear(t_bifi *x)
{
x->b_err = BIFI_ERR_OK;
x->b_syserrno = 0;
errno = 0;
}
static void bifi_error_set(t_bifi *x, int errcode)
{
x->b_err = errcode;
x->b_syserrno = errno;
if (errcode != BIFI_ERR_OK && x->b_fp)
{
fclose(x->b_fp);
x->b_fp = 0;
}
#if 0 /* LATER use Pd's own error logging mechanism, maybe by calling this: */
sys_unixerror((char *)x); /* sys_logerror((char *)x, "...")? */
#endif
}
void bifi_clear(t_bifi *x)
{
bifi_swapping = !ambigendian();
x->b_fp = 0;
x->b_filename[0] = '\0';
bifi_error_clear(x);
}
t_bifi *bifi_new(t_bifi *x, char *hdr, size_t hdrsz)
{
t_bifi *result = x;
if (result) result->b_selfalloc = 0;
else {
if (!(result = getbytes(sizeof(*result)))) return (0);
result->b_selfalloc = 1;
}
if (hdr || !hdrsz) result->b_hdralloc = 0;
else {
if (!(hdr = getbytes(hdrsz)))
{
if (result->b_selfalloc) freebytes(result, sizeof(*result));
return (0);
}
result->b_hdralloc = 1;
}
result->b_header = hdr;
result->b_headersize = hdrsz;
bifi_clear(result);
return (result);
}
void bifi_free(t_bifi *x)
{
if (x->b_fp) fclose(x->b_fp);
if (x->b_hdralloc) freebytes(x->b_header, x->b_headersize);
if (x->b_selfalloc) freebytes(x, sizeof(*x));
}
void bifi_error_report(t_bifi *x)
{
char *errmess = 0;
switch (x->b_err)
{
case BIFI_ERR_OK:
break;
case BIFI_ERR_OPEN:
errmess = "cannot open";
break;
case BIFI_ERR_READ:
errmess = "error reading";
break;
case BIFI_ERR_WRITE:
errmess = "error writing";
break;
case BIFI_ERR_BADHEADER:
errmess = "missing header of";
break;
default:
post("binary file i/o unknown error");
}
if (errmess)
post("%s binary file `%s\' (errno %d: %s)", errmess,
x->b_filename, x->b_syserrno, strerror(x->b_syserrno));
bifi_error_clear(x);
}
/* Open file and read in its header (x must be a valid t_bifi pointer,
no checks are being made...)
*/
int bifi_read_start(t_bifi *x, const char *filename, const char *dirname)
{
int fd;
char dirbuf[MAXPDSTRING], *nameptr;
bifi_clear(x);
strcpy(x->b_filename, filename);
if ((fd = open_via_path(dirname, filename,
"", dirbuf, &nameptr, MAXPDSTRING, 1)) < 0)
{
bifi_error_set(x, BIFI_ERR_OPEN);
return (0);
}
/* Closing/reopening dance. This is unnecessary under linux, and we
could have tried to convert fd to fp (since we prefer using streams),
but under windows open_via_path() returns what seems to be an invalid
fd. LATER try to understand what is going on here... */
close(fd);
if (dirbuf != nameptr)
{
char *slashpos = dirbuf + strlen(dirbuf);
*slashpos++ = '/';
/* try not to be dependent on current open_via_path() implementation */
if (nameptr != slashpos)
strcpy(slashpos, nameptr);
}
sys_unbashfilename(dirbuf, dirbuf);
if (!(x->b_fp = fopen(dirbuf, "rb")))
{
bifi_error_set(x, BIFI_ERR_OPEN);
return (0);
}
if (x->b_headersize &&
fread(x->b_header, 1, x->b_headersize, x->b_fp) < x->b_headersize)
{
bifi_error_set(x, BIFI_ERR_BADHEADER);
return (0);
}
return (1);
}
/* Open file and write the supplied header (x must be a valid t_bifi pointer
with header data properly filled, no checks are being made...)
*/
int bifi_write_start(t_bifi *x, const char *filename, const char *dirname)
{
char fnamebuf[MAXPDSTRING];
bifi_clear(x);
strcpy(x->b_filename, filename);
fnamebuf[0] = 0;
if (*dirname)
strcat(fnamebuf, dirname), strcat(fnamebuf, "/");
strcat(fnamebuf, filename);
sys_bashfilename(fnamebuf, fnamebuf);
if (!(x->b_fp = fopen(fnamebuf, "wb")))
{
bifi_error_set(x, BIFI_ERR_OPEN);
return (0);
}
if (x->b_headersize &&
fwrite(x->b_header, 1, x->b_headersize, x->b_fp) < x->b_headersize)
{
bifi_error_set(x, BIFI_ERR_WRITE);
return (0);
}
return (1);
}
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