From 885f5974cdf65b59415837ae97f5a14ef1350670 Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Tue, 9 Dec 2025 19:20:15 +0100
Subject: feat: add gzip and new headers

---
 bin/gzip/zip.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 bin/gzip/zip.c

(limited to 'bin/gzip/zip.c')

diff --git a/bin/gzip/zip.c b/bin/gzip/zip.c
new file mode 100644
index 00000000..919be412
--- /dev/null
+++ b/bin/gzip/zip.c
@@ -0,0 +1,112 @@
+/* zip.c -- compress files to the gzip or pkzip format
+ * Copyright (C) 1992-1993 Jean-loup Gailly
+ * This is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License, see the file COPYING.
+ */
+
+#ifdef RCSID
+static char rcsid[] = "$Id: zip.c,v 1.1 2002/08/18 00:59:21 hpa Exp $";
+#endif
+
+#include <ctype.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "tailor.h"
+#include "gzip.h"
+
+local ulg crc; /* crc on uncompressed file data */
+
+/* ===========================================================================
+ * Deflate in to out.
+ * IN assertions: the input and output buffers are cleared.
+ *   The variables time_stamp and save_orig_name are initialized.
+ */
+int zip(in, out)
+int in, out; /* input and output file descriptors */
+{
+	uch flags = 0;	       /* general purpose bit flags */
+	ush attr = 0;	       /* ascii/binary flag */
+	ush deflate_flags = 0; /* pkzip -es, -en or -ex equivalent */
+
+	ifd = in;
+	ofd = out;
+	outcnt = 0;
+
+	/* Write the header to the gzip file. See algorithm.doc for the format
+	 */
+
+	method = DEFLATED;
+	put_byte(GZIP_MAGIC[0]); /* magic header */
+	put_byte(GZIP_MAGIC[1]);
+	put_byte(DEFLATED); /* compression method */
+
+	if (save_orig_name) {
+		flags |= ORIG_NAME;
+	}
+	put_byte(flags); /* general flags */
+	put_long(time_stamp);
+
+	/* Write deflated file to zip file */
+	crc = updcrc(0, 0);
+
+	bi_init(out);
+	ct_init(&attr, &method);
+	lm_init(level, &deflate_flags);
+
+	put_byte((uch)deflate_flags); /* extra flags */
+	put_byte(OS_CODE);	      /* OS identifier */
+
+	if (save_orig_name) {
+		char *p = basename(ifname); /* Don't save the directory part. */
+		do {
+			put_char(*p);
+		} while (*p++);
+	}
+	header_bytes = (long)outcnt;
+
+	(void)deflate();
+
+#if !defined(NO_SIZE_CHECK) && !defined(RECORD_IO)
+	/* Check input size (but not in VMS -- variable record lengths mess it
+	 * up) and not on MSDOS -- diet in TSR mode reports an incorrect file
+	 * size)
+	 */
+	if (ifile_size != -1L && isize != (ulg)ifile_size) {
+		Trace((stderr, " actual=%ld, read=%ld ", ifile_size, isize));
+		fprintf(stderr, "%s: %s: file size changed while zipping\n",
+			progname, ifname);
+	}
+#endif
+
+	/* Write the crc and uncompressed size */
+	put_long(crc);
+	put_long(isize);
+	header_bytes += 2 * sizeof(long);
+
+	flush_outbuf();
+	return OK;
+}
+
+/* ===========================================================================
+ * Read a new buffer from the current input file, perform end-of-line
+ * translation, and update the crc and input file size.
+ * IN assertion: size >= 2 (for end-of-line translation)
+ */
+int file_read(buf, size)
+char *buf;
+unsigned size;
+{
+	unsigned len;
+
+	Assert(insize == 0, "inbuf not empty");
+
+	len = read(ifd, buf, size);
+	if (len == (unsigned)(-1) || len == 0)
+		return (int)len;
+
+	crc = updcrc((uch *)buf, len);
+	isize += (ulg)len;
+	return (int)len;
+}
-- 
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