/* * Copyright (C) 2003-2009 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 "icy_metadata.h" #include "tag.h" #include <glib.h> #include <assert.h> #include <string.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "icy_metadata" 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(length > 0); if (!icy_defined(im)) return length; 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, p, 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; }