174 lines
3.5 KiB
C++
174 lines
3.5 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "IcyMetaDataParser.hxx"
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#include "tag/Tag.hxx"
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#include "util/Domain.hxx"
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#include "Log.hxx"
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#include <glib.h>
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#include <assert.h>
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#include <string.h>
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static constexpr Domain icy_metadata_domain("icy_metadata");
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void
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IcyMetaDataParser::Reset()
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{
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if (!IsDefined())
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return;
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if (data_rest == 0 && meta_size > 0)
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g_free(meta_data);
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delete tag;
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data_rest = data_size;
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meta_size = 0;
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}
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size_t
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IcyMetaDataParser::Data(size_t length)
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{
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assert(length > 0);
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if (!IsDefined())
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return length;
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if (data_rest == 0)
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return 0;
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if (length >= data_rest) {
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length = data_rest;
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data_rest = 0;
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} else
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data_rest -= length;
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return length;
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}
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static void
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icy_add_item(Tag &tag, TagType type, const char *value)
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{
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size_t length = strlen(value);
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if (length >= 2 && value[0] == '\'' && value[length - 1] == '\'') {
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/* strip the single quotes */
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++value;
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length -= 2;
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}
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if (length > 0)
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tag.AddItem(type, value, length);
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}
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static void
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icy_parse_tag_item(Tag &tag, const char *item)
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{
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gchar **p = g_strsplit(item, "=", 0);
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if (p[0] != nullptr && p[1] != nullptr) {
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if (strcmp(p[0], "StreamTitle") == 0)
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icy_add_item(tag, TAG_TITLE, p[1]);
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else
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FormatDebug(icy_metadata_domain,
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"unknown icy-tag: '%s'", p[0]);
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}
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g_strfreev(p);
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}
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static Tag *
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icy_parse_tag(const char *p)
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{
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Tag *tag = new Tag();
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gchar **items = g_strsplit(p, ";", 0);
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for (unsigned i = 0; items[i] != nullptr; ++i)
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icy_parse_tag_item(*tag, items[i]);
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g_strfreev(items);
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return tag;
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}
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size_t
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IcyMetaDataParser::Meta(const void *data, size_t length)
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{
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const unsigned char *p = (const unsigned char *)data;
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assert(IsDefined());
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assert(data_rest == 0);
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assert(length > 0);
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if (meta_size == 0) {
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/* read meta_size from the first byte of a meta
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block */
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meta_size = *p++ * 16;
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if (meta_size == 0) {
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/* special case: no metadata */
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data_rest = data_size;
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return 1;
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}
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/* 1 byte was consumed (must be re-added later for the
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return value */
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--length;
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/* initialize metadata reader, allocate enough
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memory (+1 for the null terminator) */
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meta_position = 0;
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meta_data = (char *)g_malloc(meta_size + 1);
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}
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assert(meta_position < meta_size);
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if (length > meta_size - meta_position)
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length = meta_size - meta_position;
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memcpy(meta_data + meta_position, p, length);
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meta_position += length;
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if (p != data)
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/* re-add the first byte (which contained meta_size) */
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++length;
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if (meta_position == meta_size) {
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/* null-terminate the string */
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meta_data[meta_size] = 0;
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/* parse */
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delete tag;
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tag = icy_parse_tag(meta_data);
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g_free(meta_data);
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/* change back to normal data mode */
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meta_size = 0;
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data_rest = data_size;
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}
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return length;
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}
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