mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-28 14:00:44 +00:00
4d1eb5fdb1
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Peter Lieven <pl@kamp.de> Reviewed-by: Daniel Berrange <berrange@redhat.com> Message-id: 1446203414-4013-4-git-send-email-kraxel@redhat.com
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
|
|
* 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"
|
|
|
|
#define BUFFER_MIN_INIT_SIZE 4096
|
|
|
|
void buffer_init(Buffer *buffer, const char *name, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, name);
|
|
buffer->name = g_strdup_vprintf(name, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
void buffer_reserve(Buffer *buffer, size_t len)
|
|
{
|
|
if ((buffer->capacity - buffer->offset) < len) {
|
|
buffer->capacity = pow2ceil(buffer->offset + len);
|
|
buffer->capacity = MAX(buffer->capacity, BUFFER_MIN_INIT_SIZE);
|
|
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);
|
|
g_free(buffer->name);
|
|
buffer->offset = 0;
|
|
buffer->capacity = 0;
|
|
buffer->buffer = NULL;
|
|
buffer->name = 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;
|
|
}
|
|
|
|
void buffer_move_empty(Buffer *to, Buffer *from)
|
|
{
|
|
assert(to->offset == 0);
|
|
|
|
g_free(to->buffer);
|
|
to->offset = from->offset;
|
|
to->capacity = from->capacity;
|
|
to->buffer = from->buffer;
|
|
|
|
from->offset = 0;
|
|
from->capacity = 0;
|
|
from->buffer = NULL;
|
|
}
|