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authorDaniel P. Berrange <berrange@redhat.com>2015-03-03 17:13:42 +0000
committerDaniel P. Berrange <berrange@redhat.com>2015-10-20 14:59:09 +0100
commit88c5f205fa4c095db4c50eb7ad72816140206819 (patch)
tree00662609c3f1e34c7814b020d75fcb0f200fa299 /util/buffer.c
parent10817bf09d5f8cb22711fb0ee8d8da49f6f05f89 (diff)
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util: pull Buffer code out of VNC module
The Buffer code in the VNC server is useful for the IO channel code, so pull it out into a shared module, QIOBuffer. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'util/buffer.c')
-rw-r--r--util/buffer.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/util/buffer.c b/util/buffer.c
new file mode 100644
index 0000000..cedd055
--- /dev/null
+++ b/util/buffer.c
@@ -0,0 +1,65 @@
+/*
+ * QEMU generic buffers
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/buffer.h"
+
+void buffer_reserve(Buffer *buffer, size_t len)
+{
+ if ((buffer->capacity - buffer->offset) < len) {
+ buffer->capacity += (len + 1024);
+ buffer->buffer = g_realloc(buffer->buffer, buffer->capacity);
+ }
+}
+
+gboolean buffer_empty(Buffer *buffer)
+{
+ return buffer->offset == 0;
+}
+
+uint8_t *buffer_end(Buffer *buffer)
+{
+ return buffer->buffer + buffer->offset;
+}
+
+void buffer_reset(Buffer *buffer)
+{
+ buffer->offset = 0;
+}
+
+void buffer_free(Buffer *buffer)
+{
+ g_free(buffer->buffer);
+ buffer->offset = 0;
+ buffer->capacity = 0;
+ buffer->buffer = NULL;
+}
+
+void buffer_append(Buffer *buffer, const void *data, size_t len)
+{
+ memcpy(buffer->buffer + buffer->offset, data, len);
+ buffer->offset += len;
+}
+
+void buffer_advance(Buffer *buffer, size_t len)
+{
+ memmove(buffer->buffer, buffer->buffer + len,
+ (buffer->offset - len));
+ buffer->offset -= len;
+}