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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. */
/*
* Text frame (i.e. 'T???') 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>
# else
# ifndef HAVE_MEMCPY
# define memcpy(d,s,n) bcopy((s),(d),(n))
# define memmove(d,s,n) bcopy((s),(d),(n))
# endif
# endif
#endif
#include "nid3P.h"
int
id3_frame_text_enc(id3_frame_t f)
{
unsigned char *buf = id3_frame_get_raw(f);
if (buf) {
switch (buf[0]) {
case ID3_TEXT_ISO:
case ID3_TEXT_UTF16:
case ID3_TEXT_UTF16BE:
case ID3_TEXT_UTF8:
return (int)buf[0];
}
}
return -1;
}
/*
* Returns each text string in turn, NULL when there are no more.
*/
char *
id3_frame_text(id3_frame_t f)
{
unsigned char *buf = id3_frame_get_raw(f);
char *retval = NULL;
int i;
if (buf == NULL)
return NULL;
return buf + 1;
retval = f->curr_txt;
/* advance the f->curr_txt pointer */
if (f->curr_txt == NULL) {
f->curr_txt = buf + 1; /* start over */
} else {
i = f->curr_txt - (char *)buf;
switch (buf[0]) {
case ID3_TEXT_UTF16:
case ID3_TEXT_UTF16BE:
while (i <= f->sz && !(buf[i] == '\0' && buf[i+1] == '\0'))
i += 2;
i += 2;
break;
case ID3_TEXT_UTF8:
case ID3_TEXT_ISO:
while (i <= f->sz && buf[i] != '\0')
i++;
i++;
break;
}
if (i > f->sz)
f->curr_txt = NULL;
else
f->curr_txt = buf + i;
}
return retval;
}
/* FIXME: add ability to manipulate individual fields */
id3_frame_t
id3_add_text_frame(id3_t tag, const char *id, const char *text, int encoding)
{
id3_frame_t fr;
int len;
fr = id3_frame_add(tag, id);
if (fr == NULL)
return NULL;
len = 0;
switch (encoding) {
case ID3_TEXT_UTF16:
case ID3_TEXT_UTF16BE:
while (!(text[len] == '\0' && text[len+1] == '\0'))
len += 2;
break;
case ID3_TEXT_UTF8:
case ID3_TEXT_ISO:
while (text[len] != '\0')
len++;
break;
default:
_id3_frame_destroy(fr);
return NULL;
}
if (fr->data)
free(fr->data);
fr->sz = len + 1; /* +1 for encoding byte */
fr->data = (unsigned char *)calloc(fr->sz + 2, 1); /* +2 for nul chars */
if (fr->data == NULL) {
_id3_frame_destroy(fr);
return NULL;
}
fr->data[0] = encoding;
memcpy(fr->data + 1, text, len);
return fr;
}
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