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/*
* Copyright (C) 2003-2008 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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
*/
#include "icy_metadata.h"
#include "tag.h"
#include <glib.h>
#include <assert.h>
#include <string.h>
void
icy_deinit(struct icy_metadata *im)
{
if (!icy_defined(im))
return;
if (im->data_rest == 0 && im->meta_size > 0)
g_free(im->meta_data);
if (im->tag != NULL)
tag_free(im->tag);
}
void
icy_reset(struct icy_metadata *im)
{
if (!icy_defined(im))
return;
icy_deinit(im);
im->data_rest = im->data_size;
im->meta_size = 0;
}
size_t
icy_data(struct icy_metadata *im, size_t length)
{
assert(icy_defined(im));
assert(length > 0);
if (im->data_rest == 0)
return 0;
if (length >= im->data_rest) {
length = im->data_rest;
im->data_rest = 0;
} else
im->data_rest -= length;
return length;
}
static void
icy_add_item(struct tag *tag, enum tag_type type, const char *value)
{
size_t length = strlen(value);
if (length >= 2 && value[0] == '\'' && value[length - 1] == '\'') {
/* strip the single quotes */
++value;
length -= 2;
}
if (length > 0)
tag_add_item_n(tag, type, value, length);
}
static void
icy_parse_tag_item(struct tag *tag, const char *item)
{
gchar **p = g_strsplit(item, "=", 0);
if (p[0] != NULL && p[1] != NULL) {
if (strcmp(p[0], "StreamTitle") == 0)
icy_add_item(tag, TAG_ITEM_TITLE, p[1]);
else
g_debug("unknown icy-tag: '%s'", p[0]);
}
g_strfreev(p);
}
static struct tag *
icy_parse_tag(const char *p)
{
struct tag *tag = tag_new();
gchar **items = g_strsplit(p, ";", 0);
for (unsigned i = 0; items[i] != NULL; ++i)
icy_parse_tag_item(tag, items[i]);
g_strfreev(items);
return tag;
}
size_t
icy_meta(struct icy_metadata *im, const void *data, size_t length)
{
const unsigned char *p = data;
assert(icy_defined(im));
assert(im->data_rest == 0);
assert(length > 0);
if (im->meta_size == 0) {
/* read meta_size from the first byte of a meta
block */
im->meta_size = *p++ * 16;
if (im->meta_size == 0) {
/* special case: no metadata */
im->data_rest = im->data_size;
return 1;
}
/* 1 byte was consumed (must be re-added later for the
return value */
--length;
/* initialize metadata reader, allocate enough
memory (+1 for the null terminator) */
im->meta_position = 0;
im->meta_data = g_malloc(im->meta_size + 1);
}
assert(im->meta_position < im->meta_size);
if (length > im->meta_size - im->meta_position)
length = im->meta_size - im->meta_position;
memcpy(im->meta_data + im->meta_position, data, length);
im->meta_position += length;
if (p != data)
/* re-add the first byte (which contained meta_size) */
++length;
if (im->meta_position == im->meta_size) {
/* null-terminate the string */
im->meta_data[im->meta_size] = 0;
/* parse */
if (im->tag != NULL)
tag_free(im->tag);
im->tag = icy_parse_tag(im->meta_data);
g_free(im->meta_data);
/* change back to normal data mode */
im->meta_size = 0;
im->data_rest = im->data_size;
}
return length;
}
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