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-rw-r--r--block.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/block.c b/block.c
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index 0000000000..1ac8210e01
--- /dev/null
+++ b/block.c
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+/*
+ * QEMU System Emulator block driver
+ *
+ * Copyright (c) 2003 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <getopt.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <time.h>
+#include <sys/time.h>
+#include <malloc.h>
+#include <termios.h>
+#include <sys/poll.h>
+#include <errno.h>
+#include <sys/wait.h>
+
+#include "vl.h"
+
+struct BlockDriverState {
+ int fd;
+ int64_t total_sectors;
+};
+
+BlockDriverState *bdrv_open(const char *filename)
+{
+ BlockDriverState *bs;
+ int fd;
+ int64_t size;
+
+ bs = malloc(sizeof(BlockDriverState));
+ if(!bs)
+ return NULL;
+ fd = open(filename, O_RDWR);
+ if (fd < 0) {
+ close(fd);
+ free(bs);
+ return NULL;
+ }
+ size = lseek64(fd, 0, SEEK_END);
+ bs->total_sectors = size / 512;
+ bs->fd = fd;
+ return bs;
+}
+
+void bdrv_close(BlockDriverState *bs)
+{
+ close(bs->fd);
+ free(bs);
+}
+
+/* return -1 if error */
+int bdrv_read(BlockDriverState *bs, int64_t sector_num,
+ uint8_t *buf, int nb_sectors)
+{
+ int ret;
+
+ lseek64(bs->fd, sector_num * 512, SEEK_SET);
+ ret = read(bs->fd, buf, nb_sectors * 512);
+ if (ret != nb_sectors * 512)
+ return -1;
+ else
+ return 0;
+}
+
+/* return -1 if error */
+int bdrv_write(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors)
+{
+ int ret;
+
+ lseek64(bs->fd, sector_num * 512, SEEK_SET);
+ ret = write(bs->fd, buf, nb_sectors * 512);
+ if (ret != nb_sectors * 512)
+ return -1;
+ else
+ return 0;
+}
+
+void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
+{
+ *nb_sectors_ptr = bs->total_sectors;
+}