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authorMax Kellermann <max@duempel.org>2013-01-07 10:36:27 +0100
committerMax Kellermann <max@duempel.org>2013-01-07 10:36:27 +0100
commit47911f9544ecd3b028cc044b400536234b17949a (patch)
tree337b28a3679611dd70252f52dd6ad98faf35fdf0 /src/Tag.cxx
parent48025c2279c246236aca858f37759726a5d3042c (diff)
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tag: convert to C++
Diffstat (limited to 'src/Tag.cxx')
-rw-r--r--src/Tag.cxx508
1 files changed, 508 insertions, 0 deletions
diff --git a/src/Tag.cxx b/src/Tag.cxx
new file mode 100644
index 000000000..bdaf76f57
--- /dev/null
+++ b/src/Tag.cxx
@@ -0,0 +1,508 @@
+/*
+ * 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 "tag.h"
+#include "TagInternal.hxx"
+#include "TagPool.hxx"
+#include "conf.h"
+#include "song.h"
+#include "mpd_error.h"
+
+#include <glib.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/**
+ * Maximum number of items managed in the bulk list; if it is
+ * exceeded, we switch back to "normal" reallocation.
+ */
+#define BULK_MAX 64
+
+static struct {
+#ifndef NDEBUG
+ bool busy;
+#endif
+ struct tag_item *items[BULK_MAX];
+} bulk;
+
+bool ignore_tag_items[TAG_NUM_OF_ITEM_TYPES];
+
+enum tag_type
+tag_name_parse(const char *name)
+{
+ assert(name != nullptr);
+
+ for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
+ assert(tag_item_names[i] != nullptr);
+
+ if (strcmp(name, tag_item_names[i]) == 0)
+ return (enum tag_type)i;
+ }
+
+ return TAG_NUM_OF_ITEM_TYPES;
+}
+
+enum tag_type
+tag_name_parse_i(const char *name)
+{
+ assert(name != nullptr);
+
+ for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i) {
+ assert(tag_item_names[i] != nullptr);
+
+ if (g_ascii_strcasecmp(name, tag_item_names[i]) == 0)
+ return (enum tag_type)i;
+ }
+
+ return TAG_NUM_OF_ITEM_TYPES;
+}
+
+static size_t items_size(const struct tag *tag)
+{
+ return tag->num_items * sizeof(struct tag_item *);
+}
+
+void tag_lib_init(void)
+{
+ const char *value;
+ int quit = 0;
+ char *temp;
+ char *s;
+ char *c;
+ enum tag_type type;
+
+ /* parse the "metadata_to_use" config parameter below */
+
+ /* ignore comments by default */
+ ignore_tag_items[TAG_COMMENT] = true;
+
+ value = config_get_string(CONF_METADATA_TO_USE, nullptr);
+ if (value == nullptr)
+ return;
+
+ memset(ignore_tag_items, true, TAG_NUM_OF_ITEM_TYPES);
+
+ if (0 == g_ascii_strcasecmp(value, "none"))
+ return;
+
+ temp = c = s = g_strdup(value);
+ while (!quit) {
+ if (*s == ',' || *s == '\0') {
+ if (*s == '\0')
+ quit = 1;
+ *s = '\0';
+
+ c = g_strstrip(c);
+ if (*c == 0)
+ continue;
+
+ type = tag_name_parse_i(c);
+ if (type == TAG_NUM_OF_ITEM_TYPES)
+ MPD_ERROR("error parsing metadata item \"%s\"",
+ c);
+
+ ignore_tag_items[type] = false;
+
+ s++;
+ c = s;
+ }
+ s++;
+ }
+
+ g_free(temp);
+}
+
+struct tag *tag_new(void)
+{
+ struct tag *ret = g_new(struct tag, 1);
+ ret->items = nullptr;
+ ret->time = -1;
+ ret->has_playlist = false;
+ ret->num_items = 0;
+ return ret;
+}
+
+static void tag_delete_item(struct tag *tag, unsigned idx)
+{
+ assert(idx < tag->num_items);
+ tag->num_items--;
+
+ g_static_mutex_lock(&tag_pool_lock);
+ tag_pool_put_item(tag->items[idx]);
+ g_static_mutex_unlock(&tag_pool_lock);
+
+ if (tag->num_items - idx > 0) {
+ memmove(tag->items + idx, tag->items + idx + 1,
+ (tag->num_items - idx) * sizeof(tag->items[0]));
+ }
+
+ if (tag->num_items > 0) {
+ tag->items = (struct tag_item **)
+ g_realloc(tag->items, items_size(tag));
+ } else {
+ g_free(tag->items);
+ tag->items = nullptr;
+ }
+}
+
+void tag_clear_items_by_type(struct tag *tag, enum tag_type type)
+{
+ for (unsigned i = 0; i < tag->num_items; i++) {
+ if (tag->items[i]->type == type) {
+ tag_delete_item(tag, i);
+ /* decrement since when just deleted this node */
+ i--;
+ }
+ }
+}
+
+void tag_free(struct tag *tag)
+{
+ int i;
+
+ assert(tag != nullptr);
+
+ g_static_mutex_lock(&tag_pool_lock);
+ for (i = tag->num_items; --i >= 0; )
+ tag_pool_put_item(tag->items[i]);
+ g_static_mutex_unlock(&tag_pool_lock);
+
+ if (tag->items == bulk.items) {
+#ifndef NDEBUG
+ assert(bulk.busy);
+ bulk.busy = false;
+#endif
+ } else
+ g_free(tag->items);
+
+ g_free(tag);
+}
+
+struct tag *tag_dup(const struct tag *tag)
+{
+ struct tag *ret;
+
+ if (!tag)
+ return nullptr;
+
+ ret = tag_new();
+ ret->time = tag->time;
+ ret->has_playlist = tag->has_playlist;
+ ret->num_items = tag->num_items;
+ ret->items = ret->num_items > 0
+ ? (struct tag_item **)g_malloc(items_size(tag))
+ : nullptr;
+
+ g_static_mutex_lock(&tag_pool_lock);
+ for (unsigned i = 0; i < tag->num_items; i++)
+ ret->items[i] = tag_pool_dup_item(tag->items[i]);
+ g_static_mutex_unlock(&tag_pool_lock);
+
+ return ret;
+}
+
+struct tag *
+tag_merge(const struct tag *base, const struct tag *add)
+{
+ struct tag *ret;
+ unsigned n;
+
+ assert(base != nullptr);
+ assert(add != nullptr);
+
+ /* allocate new tag object */
+
+ ret = tag_new();
+ ret->time = add->time > 0 ? add->time : base->time;
+ ret->num_items = base->num_items + add->num_items;
+ ret->items = ret->num_items > 0
+ ? (struct tag_item **)g_malloc(items_size(ret))
+ : nullptr;
+
+ g_static_mutex_lock(&tag_pool_lock);
+
+ /* copy all items from "add" */
+
+ for (unsigned i = 0; i < add->num_items; ++i)
+ ret->items[i] = tag_pool_dup_item(add->items[i]);
+
+ n = add->num_items;
+
+ /* copy additional items from "base" */
+
+ for (unsigned i = 0; i < base->num_items; ++i)
+ if (!tag_has_type(add, base->items[i]->type))
+ ret->items[n++] = tag_pool_dup_item(base->items[i]);
+
+ g_static_mutex_unlock(&tag_pool_lock);
+
+ assert(n <= ret->num_items);
+
+ if (n < ret->num_items) {
+ /* some tags were not copied - shrink ret->items */
+ assert(n > 0);
+
+ ret->num_items = n;
+ ret->items = (struct tag_item **)
+ g_realloc(ret->items, items_size(ret));
+ }
+
+ return ret;
+}
+
+struct tag *
+tag_merge_replace(struct tag *base, struct tag *add)
+{
+ if (add == nullptr)
+ return base;
+
+ if (base == nullptr)
+ return add;
+
+ struct tag *tag = tag_merge(base, add);
+ tag_free(base);
+ tag_free(add);
+
+ return tag;
+}
+
+const char *
+tag_get_value(const struct tag *tag, enum tag_type type)
+{
+ assert(tag != nullptr);
+ assert(type < TAG_NUM_OF_ITEM_TYPES);
+
+ for (unsigned i = 0; i < tag->num_items; i++)
+ if (tag->items[i]->type == type)
+ return tag->items[i]->value;
+
+ return nullptr;
+}
+
+bool tag_has_type(const struct tag *tag, enum tag_type type)
+{
+ return tag_get_value(tag, type) != nullptr;
+}
+
+bool tag_equal(const struct tag *tag1, const struct tag *tag2)
+{
+ if (tag1 == nullptr && tag2 == nullptr)
+ return true;
+ else if (!tag1 || !tag2)
+ return false;
+
+ if (tag1->time != tag2->time)
+ return false;
+
+ if (tag1->num_items != tag2->num_items)
+ return false;
+
+ for (unsigned i = 0; i < tag1->num_items; i++) {
+ if (tag1->items[i]->type != tag2->items[i]->type)
+ return false;
+ if (strcmp(tag1->items[i]->value, tag2->items[i]->value)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/**
+ * Replace invalid sequences with the question mark.
+ */
+static char *
+patch_utf8(const char *src, size_t length, const gchar *end)
+{
+ /* duplicate the string, and replace invalid bytes in that
+ buffer */
+ char *dest = g_strdup(src);
+
+ do {
+ dest[end - src] = '?';
+ } while (!g_utf8_validate(end + 1, (src + length) - (end + 1), &end));
+
+ return dest;
+}
+
+static char *
+fix_utf8(const char *str, size_t length)
+{
+ const gchar *end;
+ char *temp;
+ gsize written;
+
+ assert(str != nullptr);
+
+ /* check if the string is already valid UTF-8 */
+ if (g_utf8_validate(str, length, &end))
+ return nullptr;
+
+ /* no, it's not - try to import it from ISO-Latin-1 */
+ temp = g_convert(str, length, "utf-8", "iso-8859-1",
+ nullptr, &written, nullptr);
+ if (temp != nullptr)
+ /* success! */
+ return temp;
+
+ /* no, still broken - there's no medication, just patch
+ invalid sequences */
+ return patch_utf8(str, length, end);
+}
+
+void tag_begin_add(struct tag *tag)
+{
+ assert(!bulk.busy);
+ assert(tag != nullptr);
+ assert(tag->items == nullptr);
+ assert(tag->num_items == 0);
+
+#ifndef NDEBUG
+ bulk.busy = true;
+#endif
+ tag->items = bulk.items;
+}
+
+void tag_end_add(struct tag *tag)
+{
+ if (tag->items == bulk.items) {
+ assert(tag->num_items <= BULK_MAX);
+
+ if (tag->num_items > 0) {
+ /* copy the tag items from the bulk list over
+ to a new list (which fits exactly) */
+ tag->items = (struct tag_item **)
+ g_malloc(items_size(tag));
+ memcpy(tag->items, bulk.items, items_size(tag));
+ } else
+ tag->items = nullptr;
+ }
+
+#ifndef NDEBUG
+ bulk.busy = false;
+#endif
+}
+
+static bool
+char_is_non_printable(unsigned char ch)
+{
+ return ch < 0x20;
+}
+
+static const char *
+find_non_printable(const char *p, size_t length)
+{
+ for (size_t i = 0; i < length; ++i)
+ if (char_is_non_printable(p[i]))
+ return p + i;
+
+ return nullptr;
+}
+
+/**
+ * Clears all non-printable characters, convert them to space.
+ * Returns nullptr if nothing needs to be cleared.
+ */
+static char *
+clear_non_printable(const char *p, size_t length)
+{
+ const char *first = find_non_printable(p, length);
+ char *dest;
+
+ if (first == nullptr)
+ return nullptr;
+
+ dest = g_strndup(p, length);
+
+ for (size_t i = first - p; i < length; ++i)
+ if (char_is_non_printable(dest[i]))
+ dest[i] = ' ';
+
+ return dest;
+}
+
+static char *
+fix_tag_value(const char *p, size_t length)
+{
+ char *utf8, *cleared;
+
+ utf8 = fix_utf8(p, length);
+ if (utf8 != nullptr) {
+ p = utf8;
+ length = strlen(p);
+ }
+
+ cleared = clear_non_printable(p, length);
+ if (cleared == nullptr)
+ cleared = utf8;
+ else
+ g_free(utf8);
+
+ return cleared;
+}
+
+static void
+tag_add_item_internal(struct tag *tag, enum tag_type type,
+ const char *value, size_t len)
+{
+ unsigned int i = tag->num_items;
+ char *p;
+
+ p = fix_tag_value(value, len);
+ if (p != nullptr) {
+ value = p;
+ len = strlen(value);
+ }
+
+ tag->num_items++;
+
+ if (tag->items != bulk.items)
+ /* bulk mode disabled */
+ tag->items = (struct tag_item **)
+ g_realloc(tag->items, items_size(tag));
+ else if (tag->num_items >= BULK_MAX) {
+ /* bulk list already full - switch back to non-bulk */
+ assert(bulk.busy);
+
+ tag->items = (struct tag_item **)g_malloc(items_size(tag));
+ memcpy(tag->items, bulk.items,
+ items_size(tag) - sizeof(struct tag_item *));
+ }
+
+ g_static_mutex_lock(&tag_pool_lock);
+ tag->items[i] = tag_pool_get_item(type, value, len);
+ g_static_mutex_unlock(&tag_pool_lock);
+
+ g_free(p);
+}
+
+void tag_add_item_n(struct tag *tag, enum tag_type type,
+ const char *value, size_t len)
+{
+ if (ignore_tag_items[type])
+ {
+ return;
+ }
+ if (!value || !len)
+ return;
+
+ tag_add_item_internal(tag, type, value, len);
+}