diff options
Diffstat (limited to '')
-rw-r--r-- | src/IcyMetaDataParser.cxx | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/IcyMetaDataParser.cxx b/src/IcyMetaDataParser.cxx new file mode 100644 index 000000000..cda63da44 --- /dev/null +++ b/src/IcyMetaDataParser.cxx @@ -0,0 +1,173 @@ +/* + * 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; +} |