gzip 1.2.4

1 files changed, 117 insertions, 0 deletions

diff --git a/zip.c b/zip.c
new file mode 100644
index 0000000..145116d
--- /dev/null
+++ b/zip.c
@@ -0,0 +1,117 @@
+/* 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[] = "$Id$";
+#endif
+
+#include <ctype.h>
+#include <sys/types.h>
+
+#include "tailor.h"
+#include "gzip.h"
+#include "crypt.h"
+
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h>
+#endif
+#ifndef NO_FCNTL_H
+#  include <fcntl.h>
+#endif
+
+local ulg crc;       /* crc on uncompressed file data */
+long header_bytes;   /* number of bytes in gzip header */
+
+/* ===========================================================================
+ * 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;
+}