Import dnbd* from the former openslx-contrib repo as of revision 92.

openslx-contrib is currently read only and will get removed in some
days.


git-svn-id: http://svn.openslx.org/svn/openslx/contrib/dnbd2/trunk@1592 95ad53e4-c205-0410-b2fa-d234c58c8868

1 files changed, 65 insertions, 0 deletions

diff --git a/server/file.c b/server/file.c
new file mode 100644
index 0000000..26c3cd0
--- /dev/null
+++ b/server/file.c
@@ -0,0 +1,65 @@
+/*
+ * server/file.c
+ */
+
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include "file.h"
+
+
+int file_open(char *filename)
+{
+	int fd = open(filename, O_RDONLY);
+	if (fd == -1)
+		return -1;
+
+	struct stat st;
+	if (fstat(fd, &st) == -1)
+		return -1;
+
+	return fd;
+}
+
+
+int file_getsize(int fd, off_t *size)
+{
+	*size = lseek64(fd, 0, SEEK_END);
+
+	if (*size == -1)
+		return -1;
+
+	return 0;
+}
+
+
+int file_read(int fd, void *buf, size_t size, off_t pos)
+{
+	off_t newpos = lseek(fd, pos, SEEK_SET);
+
+	if (newpos == -1)
+		return -1;
+
+        size_t nleft = size;
+        ssize_t nread;
+        char *ptr = buf;
+
+        while (nleft > 0) {
+                if ((nread = read(fd, ptr, nleft)) < 0) {
+                        if (errno == EINTR)
+				continue;
+
+			return -1;
+		}
+
+		if (nread == 0) {
+                        break;
+                }
+
+                nleft -= nread;
+                ptr += nread;
+        }
+
+        return 0;
+}