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