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-rw-r--r--src/IcyMetaDataParser.cxx173
1 files changed, 173 insertions, 0 deletions
diff --git a/src/IcyMetaDataParser.cxx b/src/IcyMetaDataParser.cxx
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+++ b/src/IcyMetaDataParser.cxx
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+/*
+ * Copyright (C) 2003-2013 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "IcyMetaDataParser.hxx"
+#include "tag.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "icy_metadata"
+
+void
+IcyMetaDataParser::Reset()
+{
+ if (!IsDefined())
+ return;
+
+ if (data_rest == 0 && meta_size > 0)
+ g_free(meta_data);
+
+ if (tag != nullptr)
+ tag_free(tag);
+
+ data_rest = data_size;
+ meta_size = 0;
+}
+
+size_t
+IcyMetaDataParser::Data(size_t length)
+{
+ assert(length > 0);
+
+ if (!IsDefined())
+ return length;
+
+ if (data_rest == 0)
+ return 0;
+
+ if (length >= data_rest) {
+ length = data_rest;
+ data_rest = 0;
+ } else
+ 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] != nullptr && p[1] != nullptr) {
+ if (strcmp(p[0], "StreamTitle") == 0)
+ icy_add_item(tag, TAG_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] != nullptr; ++i)
+ icy_parse_tag_item(tag, items[i]);
+
+ g_strfreev(items);
+
+ return tag;
+}
+
+size_t
+IcyMetaDataParser::Meta(const void *data, size_t length)
+{
+ const unsigned char *p = (const unsigned char *)data;
+
+ assert(IsDefined());
+ assert(data_rest == 0);
+ assert(length > 0);
+
+ if (meta_size == 0) {
+ /* read meta_size from the first byte of a meta
+ block */
+ meta_size = *p++ * 16;
+ if (meta_size == 0) {
+ /* special case: no metadata */
+ data_rest = 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) */
+ meta_position = 0;
+ meta_data = (char *)g_malloc(meta_size + 1);
+ }
+
+ assert(meta_position < meta_size);
+
+ if (length > meta_size - meta_position)
+ length = meta_size - meta_position;
+
+ memcpy(meta_data + meta_position, p, length);
+ meta_position += length;
+
+ if (p != data)
+ /* re-add the first byte (which contained meta_size) */
+ ++length;
+
+ if (meta_position == meta_size) {
+ /* null-terminate the string */
+
+ meta_data[meta_size] = 0;
+
+ /* parse */
+
+ if (tag != nullptr)
+ tag_free(tag);
+
+ tag = icy_parse_tag(meta_data);
+ g_free(meta_data);
+
+ /* change back to normal data mode */
+
+ meta_size = 0;
+ data_rest = data_size;
+ }
+
+ return length;
+}