New common unarchive code.

1 files changed, 33 insertions, 0 deletions

diff --git a/archival/libunarchive/copy_file_chunk_fd.c b/archival/libunarchive/copy_file_chunk_fd.c
new file mode 100644
index 0000000..fb513e6
--- /dev/null
+++ b/archival/libunarchive/copy_file_chunk_fd.c
@@ -0,0 +1,33 @@
+#include <unistd.h>
+#include <sys/types.h>
+#include "libbb.h"
+
+/* Copy CHUNKSIZE bytes (or untill EOF if chunksize == -1)
+ * from SRC_FILE to DST_FILE. */
+extern int copy_file_chunk_fd(int src_fd, int dst_fd, off_t chunksize)
+{
+	size_t nread, size;
+	char buffer[BUFSIZ];
+
+	while (chunksize != 0) {
+		if (chunksize > BUFSIZ) {
+			size = BUFSIZ;
+		} else {
+			size = chunksize;
+		}
+		nread = xread(src_fd, buffer, size);
+		if (nread == 0) {
+			return 1;
+		}
+
+		if (write (dst_fd, buffer, nread) != nread) {
+			error_msg_and_die ("Short write");
+		}
+
+		if (chunksize != -1) {
+			chunksize -= nread;
+		}
+	}
+
+	return 0;
+}