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/* Copyright (C) 2001 Chris Vaill
This file is part of nid3lib.
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, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* Image frame (APIC) manipulation routines
*/
#define _POSIX_C_SOURCE 2
#include "config.h"
#if STDC_HEADERS
# include <stdlib.h>
# include <string.h>
#else
# if HAVE_STDLIB_H
# include <stdlib.h>
# endif
# if HAVE_STRING_H
# include <string.h>
# endif
#endif
#if HAVE_ERRNO_H
# include <errno.h>
#endif
#include "nid3P.h"
/*
* For a PIC or APIC frame, save the image in file fname, with the
* proper extension added (e.g. fname.jpg if the mime type is
* image/jpeg).
*/
int
id3_frame_save_image(id3_frame_t f, const char *fname)
{
id3_t tag = f->id3;
unsigned char *data;
FILE *out;
char *fullname = NULL, *mimetype;
int i, err_save;
data = id3_frame_get_raw(f);
if (data == NULL)
return -1;
switch (id3_get_version(tag)) {
case ID3_VERSION_2_2:
if (strcmp(f->id, "PIC") != 0)
return -1;
if (f->sz < 4)
return -1;
fullname = (char *)malloc(strlen(fname) + 4 + 1);
if (fullname == NULL)
return -1;
sprintf(fullname, "%s.%c%c%c", fname, data[1], data[2], data[3]);
data = data + 5;
break;
case ID3_VERSION_2_3:
case ID3_VERSION_2_4:
if (strcmp(f->id, "APIC") != 0)
return -1;
/* make sure the mime type is terminated */
for (i = 1; i < f->sz; i++)
if (data[i] == '\0')
break;
if (data[i] != '\0' || i < 8)
return -1;
mimetype = data + 7;
fullname = (char *)malloc(strlen(fname) + strlen(mimetype) + 2);
if (fullname == NULL)
return -1;
sprintf(fullname, "%s.%s", fname, mimetype);
data = data + strlen(mimetype) + 6 + 3;
}
/* skip description string */
switch (f->data[0]) {
case ID3_TEXT_UTF16:
case ID3_TEXT_UTF16BE:
while (!(data[0] == '\0' && data[1] == '\0') && data - f->data < f->sz)
data += 2;
if (!(data[0] == '\0' && data[1] == '\0'))
goto error_free;
data += 2;
break;
case ID3_TEXT_UTF8:
case ID3_TEXT_ISO:
while (data[0] != '\0' && data - f->data < f->sz)
data++;
if (data[0] != '\0')
goto error_free;
data++;
break;
}
if (data - f->data >= f->sz)
goto error_free;
out = fopen(fullname, "wb");
if (out == NULL)
goto error_close;
if (fwrite(data, f->sz - (data - f->data), 1, out) < 1)
goto error_close;
fclose(out);
free(fullname);
return 0;
error_close:
err_save = errno;
fclose(out);
free(fullname);
errno = err_save;
return -1;
error_free:
free(fullname);
errno = EINVAL;
return -1;
}
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