1 files changed, 99 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/sysdump/zout.c b/contrib/syslinux-4.02/com32/sysdump/zout.c
new file mode 100644
index 0000000..ece934c
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/sysdump/zout.c
@@ -0,0 +1,99 @@
+/*
+ * Compress input and feed it to a block-oriented back end.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <zlib.h>
+#include "backend.h"
+#include "ctime.h"
+
+#define ALLOC_CHUNK	65536
+
+int init_data(struct backend *be, const char *argv[])
+{
+    be->now = posix_time();
+    be->argv = argv;
+
+    memset(&be->zstream, 0, sizeof be->zstream);
+
+    be->zstream.next_out  = NULL;
+    be->outbuf = NULL;
+    be->zstream.avail_out = be->alloc  = 0;
+    be->dbytes = be->zbytes = 0;
+
+    /* Initialize a gzip data stream */
+    if (deflateInit2(&be->zstream, 9, Z_DEFLATED,
+		     16+15, 9, Z_DEFAULT_STRATEGY) < 0)
+	return -1;
+
+    return 0;
+}
+
+static int do_deflate(struct backend *be, int flush)
+{
+    int rv;
+    char *buf;
+
+    while (1) {
+	rv = deflate(&be->zstream, flush);
+	be->zbytes = be->alloc - be->zstream.avail_out;
+	if (be->zstream.avail_out)
+	    return rv;		   /* Not an issue of output space... */
+
+	buf = realloc(be->outbuf, be->alloc + ALLOC_CHUNK);
+	if (!buf)
+	    return Z_MEM_ERROR;
+	be->outbuf = buf;
+	be->alloc += ALLOC_CHUNK;
+	be->zstream.next_out = (void *)(buf + be->zbytes);
+	be->zstream.avail_out = be->alloc - be->zbytes;
+    }
+}
+
+
+int write_data(struct backend *be, const void *buf, size_t len)
+{
+    int rv = Z_OK;
+
+    be->zstream.next_in = (void *)buf;
+    be->zstream.avail_in = len;
+
+    be->dbytes += len;
+
+    while (be->zstream.avail_in) {
+	rv = do_deflate(be, Z_NO_FLUSH);
+	if (rv < 0) {
+	    printf("do_deflate returned %d\n", rv);
+	    return -1;
+	}
+    }
+    return 0;
+}
+
+/* Output the data and shut down the stream */
+int flush_data(struct backend *be)
+{
+    int rv = Z_OK;
+
+    while (rv != Z_STREAM_END) {
+	rv = do_deflate(be, Z_FINISH);
+	if (rv < 0)
+	    return -1;
+    }
+
+    printf("Uploading data, %u bytes... ", be->zbytes);
+
+    if (be->write(be))
+	return -1;
+
+    free(be->outbuf);
+    be->outbuf = NULL;
+    be->dbytes = be->zbytes = be->alloc = 0;
+
+    printf("done.\n");
+    return 0;
+}