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Telegram/ThirdParty/nimf/modules/services/xim/IMdkit/i18nOffsetCache.c

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+/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 2; tab-width: 2 -*- */
+/*
+ * Copyright (C) 2014 Peng Huang <shawn.p.huang@gmail.com>
+ * Copyright (C) 2014 Red Hat, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this
+ * software and its documentation for any purpose is hereby granted
+ * without fee, provided that the above copyright notice appear in
+ * all copies and that both that copyright notice and this permission
+ * notice appear in supporting documentation, and that the name of
+ * the copyright holders not be used in advertising or publicity
+ * pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied
+ * warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+ * THIS SOFTWARE.
+ *
+ * Author: Klemens Baum <klemensbaum@gmail.com>
+ */
+
+#include <X11/Xlib.h>
+#include <stddef.h>
+#include "Xi18n.h"
+
+/*
+ * The XIM specification does not limit the number of window properties
+ * that can be used to transfer data, but Xlib uses the atom strings
+ * _client0 through _client20.
+ *
+ * So use that as a sensible initial size for the offset cache.
+ */
+#define INITIAL_OFFSET_CACHE_CAPACITY 21
+#define OFFSET_CACHE_GROWTH_FACTOR 2
+
+void _Xi18nInitOffsetCache (Xi18nOffsetCache *offset_cache)
+{
+    offset_cache->size = 0;
+    offset_cache->capacity = INITIAL_OFFSET_CACHE_CAPACITY;
+    offset_cache->data = (Xi18nAtomOffsetPair *) malloc (
+        INITIAL_OFFSET_CACHE_CAPACITY * sizeof (Xi18nAtomOffsetPair));
+}
+
+unsigned long _Xi18nLookupPropertyOffset (Xi18nOffsetCache *offset_cache,
+                                          Atom key)
+{
+    Xi18nAtomOffsetPair *data;
+    size_t i;
+
+    data = offset_cache->data;
+    for (i = 0; i < offset_cache->size; ++i) {
+        if (data[i].key == key) {
+            return data[i].offset;
+        }
+    }
+
+    return 0;
+}
+
+void _Xi18nSetPropertyOffset (Xi18nOffsetCache *offset_cache, Atom key,
+                              unsigned long offset)
+{
+    Xi18nAtomOffsetPair *data = offset_cache->data;
+    size_t i;
+
+    for (i = 0; i < offset_cache->size; ++i) {
+        if (data[i].key == key) {
+            data[i].offset = offset;
+            return;
+        }
+    }
+
+    if (++offset_cache->size > offset_cache->capacity) {
+        offset_cache->capacity *= OFFSET_CACHE_GROWTH_FACTOR;
+        offset_cache->data = (Xi18nAtomOffsetPair *) realloc (data,
+                offset_cache->capacity * sizeof (Xi18nAtomOffsetPair));
+        if (offset_cache->data == NULL) {
+            offset_cache->data = data;
+            --offset_cache->size;
+        }
+        data = offset_cache->data;
+    }
+
+    if (offset_cache->size > 0) {
+        data[i].key = key;
+        data[i].offset = offset;
+    }
+}
+