initial commit

1 files changed, 58 insertions, 0 deletions

diff --git a/src/server/file.c b/src/server/file.c
new file mode 100644
index 0000000..c53ca15
--- /dev/null
+++ b/src/server/file.c
@@ -0,0 +1,58 @@
+#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;
+}