1 files changed, 75 insertions, 0 deletions
diff --git a/com32/sysdump/cpio.c b/com32/sysdump/cpio.c
new file mode 100644
index 00000000..81d0d4be
--- /dev/null
+++ b/com32/sysdump/cpio.c
@@ -0,0 +1,75 @@
+/*
+ * cpio.c
+ *
+ * Write a compressed CPIO file
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <zlib.h>
+#include "backend.h"
+#include "ctime.h"
+
+int cpio_pad(struct backend *be)
+{
+    static char pad[4];		/* Up to 4 zero bytes */
+    if (be->dbytes & 3)
+	return write_data(be, pad, -be->dbytes & 3);
+    else
+	return 0;
+}
+
+int cpio_hdr(struct backend *be, uint32_t mode, size_t datalen,
+	     const char *filename)
+{
+    static uint32_t inode = 2;
+    char hdr[6+13*8+1];
+    int nlen = strlen(filename)+1;
+    int rv = 0;
+
+    cpio_pad(be);
+
+    sprintf(hdr, "%06o%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x",
+	    070701,		/* c_magic */
+	    inode++,		/* c_ino */
+	    mode,		/* c_mode */
+	    0,			/* c_uid */
+	    0,			/* c_gid */
+	    1,			/* c_nlink */
+	    be->now,		/* c_mtime */
+	    datalen,		/* c_filesize */
+	    0,			/* c_maj */
+	    0,			/* c_min */
+	    0,			/* c_rmaj */
+	    0,			/* c_rmin */
+	    nlen,		/* c_namesize */
+	    0);			/* c_chksum */
+    rv |= write_data(be, hdr, 6+13*8);
+    rv |= write_data(be, filename, nlen);
+    rv |= cpio_pad(be);
+    return rv;
+}
+
+int cpio_mkdir(struct backend *be, const char *filename)
+{
+    return cpio_hdr(be, MODE_DIR, 0, filename);
+}
+
+int cpio_writefile(struct backend *be, const char *filename,
+		   const void *data, size_t len)
+{
+    int rv;
+
+    rv = cpio_hdr(be, MODE_FILE, len, filename);
+    rv |= write_data(be, data, len);
+    rv |= cpio_pad(be);
+
+    return rv;
+}
+
+int cpio_close(struct backend *be)
+{
+    return cpio_hdr(be, 0, 0, "TRAILER!!!");
+}