/*
* Function id3_get_comment(frame)
*
* Return string contents of a comment frame.
*
*/
char *id3_get_comment(struct id3_frame *frame)
{
int offset;
/* Type check */
if (frame->fr_desc->fd_id != ID3_COMM)
return NULL;
/* Check if frame is compressed */
if (id3_decompress_frame(frame) == -1)
return NULL;
if (frame->fr_size < 5)
return NULL;
/* Skip language id */
offset = 3;
/* Skip the description */
offset += id3_string_size(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame) + offset);
if (offset >= frame->fr_size)
return NULL;
return id3_string_decode(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame) + offset);
}
/*
* Function id3_get_text (frame)
*
* Return string contents of frame.
*
*/
char *id3_get_text(struct id3_frame *frame)
{
int offset = 0;
/* Type check */
if (frame->fr_desc->fd_idstr[0] != 'T')
return NULL;
/* Check if frame is compressed */
if (id3_decompress_frame(frame) == -1)
return NULL;
if (frame->fr_desc->fd_id == ID3_TXXX)
{
/*
* This is a user defined text frame. Skip the description.
*/
offset = id3_string_size(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame));
if (offset >= frame->fr_size)
return NULL;
}
return id3_string_decode(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame) + offset);
}
static GSList* id3_get_content_v24(struct id3_frame *frame)
{
GSList *list = NULL;
int offset = 0;
while (offset < frame->fr_size - 1)
{
int num;
char *input, *endptr;
input = id3_string_decode(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame) + offset);
if (!input)
break;
/* Get ID3v1 genre number */
num = strtol(input, &endptr, 10);
if (endptr && endptr != input && *endptr == '\0' &&
num >= 0 && num < 256)
list = push_element(list, num, NULL);
else if (!strcmp(input, "RX"))
list = push_element(list, -1, _("Remix"));
else if (!strcmp(input, "CR"))
list = push_element(list, -1, _("Cover"));
else
list = push_element(list, -1, input);
offset += id3_string_size(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame) + offset);
}
return list;
}
/*
* Function id3_get_text_desc (frame)
*
* Get description part of a text frame.
*
*/
char *id3_get_text_desc(struct id3_frame *frame)
{
/* Type check */
if (frame->fr_desc->fd_idstr[0] != 'T')
return NULL;
/* If predefined text frame, return description. */
if (frame->fr_desc->fd_id != ID3_TXXX)
return frame->fr_desc->fd_description;
/* Check if frame is compressed */
if (id3_decompress_frame(frame) == -1)
return NULL;
return id3_string_decode(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame));
}
/*
* Function id3_get_text_number (frame)
*
* Return string contents of frame translated to a positive
* integer, or -1 if an error occured.
*
*/
int id3_get_text_number(struct id3_frame *frame)
{
int number = 0;
char* number_str;
/* Check if frame is compressed */
if (id3_decompress_frame(frame) == -1)
return -1;
number_str = id3_string_decode(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame));
if (number_str != NULL)
{
sscanf(number_str, "%d", &number);
free(number_str);
}
return number;
}
static GSList* id3_get_content_v23(struct id3_frame *frame)
{
GSList *list = NULL;
char *input, *ptr;
input = id3_string_decode(ID3_TEXT_FRAME_ENCODING(frame),
ID3_TEXT_FRAME_PTR(frame));
if (!input)
return NULL;
ptr = input;
while (ptr[0] == '(' && ptr[1] != '(')
{
if (!strchr(ptr, ')'))
break;
if (strncmp(ptr, "(RX)", 4) == 0)
{
list = push_element(list, -1, _("Remix"));
ptr += 4;
}
else if (strncmp(ptr, "(CR)", 4) == 0)
{
list = push_element(list, -1, _("Cover"));
ptr += 4;
}
else
{
/* Get ID3v1 genre number */
int num;
char *endptr;
num = strtol(ptr + 1, &endptr, 10);
if (*endptr == ')' && num >= 0 && num <= 255)
{
list = push_element(list, num, NULL);
ptr = endptr + 1;
}
else if (*endptr == ')')
ptr = endptr + 1;
else
break;
}
}
if (*ptr == 0) {
/* Unexpected end of ID */
g_slist_free(list);
g_free(input);
return NULL;
}
/*
* Add plaintext refinement.
*/
if (strncmp(ptr, "((", 2))
ptr++;
list = push_element(list, -1, ptr);
g_free(input);
return list;
}