538 lines
13 KiB
C
538 lines
13 KiB
C
/*
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* Copyright (c) 2006 Stefan Traby <stefan@hello-penguin.com>
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*
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* Redistribution and use in source and binary forms, with or without modifica-
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* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Alternatively, the contents of this file may be used under the terms of
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* the GNU General Public License ("GPL") version 2 or any later version,
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* in which case the provisions of the GPL are applicable instead of
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* the above. If you wish to allow the use of your version of this file
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* only under the terms of the GPL and not to allow others to use your
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* version of this file under the BSD license, indicate your decision
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* by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete the
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* provisions above, a recipient may use your version of this file under
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* either the BSD or the GPL.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <limits.h>
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#include "lzf.h"
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#ifdef HAVE_GETOPT_H
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# include <getopt.h>
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#endif
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#define BLOCKSIZE (1024 * 64 - 1)
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#define MAX_BLOCKSIZE BLOCKSIZE
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typedef unsigned char u8;
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static off_t nr_read, nr_written;
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static const char *imagename;
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static enum { compress, uncompress, lzcat } mode = compress;
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static int verbose = 0;
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static int force = 0;
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static long blocksize = BLOCKSIZE;
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#ifdef HAVE_GETOPT_LONG
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struct option longopts[] = {
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{"compress", 0, 0, 'c'},
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{"decompress", 0, 0, 'd'},
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{"uncompress", 0, 0, 'd'},
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{"force", 0, 0, 'f'},
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{"help", 0, 0, 'h'},
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{"verbose", 0, 0, 'v'},
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{"blocksize", 1, 0, 'b'},
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{0, 0, 0, 0}
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};
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static const char *opt =
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"-c --compress compress\n"
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"-d --decompress decompress\n"
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"-f --force force overwrite of output file\n"
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"-h --help give this help\n" "-v --verbose verbose mode\n" "-b # --blocksize # set blocksize\n" "\n";
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#else
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static const char *opt =
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"-c compress\n"
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"-d decompress\n"
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"-f force overwrite of output file\n"
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"-h give this help\n"
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"-v verbose mode\n"
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"-b # set blocksize\n"
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"\n";
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#endif
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static void
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usage (int rc)
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{
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fprintf (stderr, "\n"
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"lzf, a very lightweight compression/decompression utility written by Stefan Traby.\n"
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"uses liblzf written by Marc Lehmann <schmorp@schmorp.de> You can find more info at\n"
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"http://liblzf.plan9.de/\n"
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"\n"
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"usage: lzf [-dufhvb] [file ...]\n"
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" unlzf [file ...]\n"
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" lzcat [file ...]\n"
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"\n%s",
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opt);
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exit (rc);
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}
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static inline ssize_t
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rread (int fd, void *buf, size_t len)
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{
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ssize_t rc = 0, offset = 0;
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char *p = buf;
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while (len && (rc = read (fd, &p[offset], len)) > 0)
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{
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offset += rc;
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len -= rc;
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}
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nr_read += offset;
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if (rc < 0)
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return rc;
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return offset;
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}
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/* returns 0 if all written else -1 */
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static inline ssize_t
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wwrite (int fd, void *buf, size_t len)
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{
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ssize_t rc;
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char *b = buf;
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size_t l = len;
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while (l)
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{
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rc = write (fd, b, l);
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if (rc < 0)
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{
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fprintf (stderr, "%s: write error: ", imagename);
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perror ("");
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return -1;
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}
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l -= rc;
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b += rc;
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}
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nr_written += len;
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return 0;
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}
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/*
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* Anatomy: an lzf file consists of any number of blocks in the following format:
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*
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* \x00 EOF (optional)
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* "ZV\0" 2-byte-usize <uncompressed data>
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* "ZV\1" 2-byte-csize 2-byte-usize <compressed data>
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* "ZV\2" 4-byte-crc32-0xdebb20e3 (NYI)
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*/
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#define TYPE0_HDR_SIZE 5
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#define TYPE1_HDR_SIZE 7
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#define MAX_HDR_SIZE 7
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#define MIN_HDR_SIZE 5
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static int
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compress_fd (int from, int to)
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{
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ssize_t us, cs, len;
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u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
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u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
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u8 *header;
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nr_read = nr_written = 0;
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while ((us = rread (from, &buf1[MAX_HDR_SIZE], blocksize)) > 0)
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{
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cs = lzf_compress (&buf1[MAX_HDR_SIZE], us, &buf2[MAX_HDR_SIZE], us > 4 ? us - 4 : us);
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if (cs)
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{
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header = &buf2[MAX_HDR_SIZE - TYPE1_HDR_SIZE];
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header[0] = 'Z';
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header[1] = 'V';
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header[2] = 1;
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header[3] = cs >> 8;
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header[4] = cs & 0xff;
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header[5] = us >> 8;
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header[6] = us & 0xff;
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len = cs + TYPE1_HDR_SIZE;
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}
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else
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{ // write uncompressed
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header = &buf1[MAX_HDR_SIZE - TYPE0_HDR_SIZE];
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header[0] = 'Z';
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header[1] = 'V';
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header[2] = 0;
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header[3] = us >> 8;
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header[4] = us & 0xff;
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len = us + TYPE0_HDR_SIZE;
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}
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if (wwrite (to, header, len) == -1)
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return -1;
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}
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return 0;
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}
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static int
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uncompress_fd (int from, int to)
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{
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u8 header[MAX_HDR_SIZE];
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u8 buf1[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
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u8 buf2[MAX_BLOCKSIZE + MAX_HDR_SIZE + 16];
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u8 *p;
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int l, rd;
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ssize_t rc, cs, us, bytes, over = 0;
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nr_read = nr_written = 0;
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while (1)
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{
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rc = rread (from, header + over, MAX_HDR_SIZE - over);
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if (rc < 0)
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{
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fprintf (stderr, "%s: read error: ", imagename);
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perror ("");
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return -1;
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}
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rc += over;
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over = 0;
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if (!rc || header[0] == 0)
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return 0;
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if (rc < MIN_HDR_SIZE || header[0] != 'Z' || header[1] != 'V')
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{
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fprintf (stderr, "%s: invalid data stream - magic not found or short header\n", imagename);
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return -1;
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}
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switch (header[2])
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{
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case 0:
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cs = -1;
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us = (header[3] << 8) | header[4];
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p = &header[TYPE0_HDR_SIZE];
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break;
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case 1:
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if (rc < TYPE1_HDR_SIZE)
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{
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goto short_read;
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}
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cs = (header[3] << 8) | header[4];
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us = (header[5] << 8) | header[6];
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p = &header[TYPE1_HDR_SIZE];
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break;
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default:
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fprintf (stderr, "%s: unknown blocktype\n", imagename);
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return -1;
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}
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bytes = cs == -1 ? us : cs;
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l = &header[rc] - p;
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if (l > 0)
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memcpy (buf1, p, l);
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if (l > bytes)
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{
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over = l - bytes;
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memmove (header, &p[bytes], over);
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}
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p = &buf1[l];
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rd = bytes - l;
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if (rd > 0)
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if ((rc = rread (from, p, rd)) != rd)
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goto short_read;
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if (cs == -1)
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{
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if (wwrite (to, buf1, us))
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return -1;
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}
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else
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{
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if (lzf_decompress (buf1, cs, buf2, us) != us)
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{
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fprintf (stderr, "%s: decompress: invalid stream - data corrupted\n", imagename);
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return -1;
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}
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if (wwrite (to, buf2, us))
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return -1;
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}
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}
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return 0;
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short_read:
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fprintf (stderr, "%s: short data\n", imagename);
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return -1;
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}
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static int
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open_out (const char *name)
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{
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int fd;
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int m = O_EXCL;
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if (force)
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m = 0;
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fd = open (name, O_CREAT | O_WRONLY | O_TRUNC | m, 600);
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#if defined(__MINGW32__)
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_setmode(fd, _O_BINARY);
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#endif
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return fd;
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}
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static int
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compose_name (const char *fname, char *oname)
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{
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char *p;
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if (mode == compress)
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{
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if (strlen (fname) > PATH_MAX - 4)
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{
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fprintf (stderr, "%s: %s.lzf: name too long", imagename, fname);
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return -1;
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}
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strcpy (oname, fname);
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strcat (oname, ".lzf");
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}
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else
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{
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if (strlen (fname) > PATH_MAX)
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{
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fprintf (stderr, "%s: %s: name too long\n", imagename, fname);
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return -1;
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}
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strcpy (oname, fname);
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p = &oname[strlen (oname)] - 4;
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if (p < oname || strcmp (p, ".lzf"))
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{
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fprintf (stderr, "%s: %s: unknown suffix\n", imagename, fname);
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return -1;
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}
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*p = 0;
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}
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return 0;
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}
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static int
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run_file (const char *fname)
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{
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int fd, fd2;
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int rc;
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struct stat mystat;
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char oname[PATH_MAX + 1];
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if (mode != lzcat)
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if (compose_name (fname, oname))
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return -1;
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#if !defined(__MINGW32__)
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rc = lstat (fname, &mystat);
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#else
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rc = stat (fname, &mystat);
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#endif
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fd = open (fname, O_RDONLY);
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#if defined(__MINGW32__)
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_setmode(fd, _O_BINARY);
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#endif
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if (rc || fd == -1)
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{
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fprintf (stderr, "%s: %s: ", imagename, fname);
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perror ("");
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return -1;
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}
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if (!S_ISREG (mystat.st_mode))
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{
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fprintf (stderr, "%s: %s: not a regular file.\n", imagename, fname);
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close (fd);
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return -1;
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}
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if (mode == lzcat)
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{
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rc = uncompress_fd (fd, 1);
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close (fd);
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return rc;
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}
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fd2 = open_out (oname);
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if (fd2 == -1)
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{
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fprintf (stderr, "%s: %s: ", imagename, oname);
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perror ("");
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close (fd);
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return -1;
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}
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if (mode == compress)
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{
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rc = compress_fd (fd, fd2);
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if (!rc && verbose)
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fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
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fname, nr_read == 0 ? 0 : 100.0 - nr_written / ((double) nr_read / 100.0), oname);
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}
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else
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{
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rc = uncompress_fd (fd, fd2);
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if (!rc && verbose)
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fprintf (stderr, "%s: %5.1f%% -- replaced with %s\n",
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fname, nr_written == 0 ? 0 : 100.0 - nr_read / ((double) nr_written / 100.0), oname);
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}
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#if !defined(__MINGW32__)
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fchmod (fd2, mystat.st_mode);
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#else
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chmod (oname, mystat.st_mode);
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#endif
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close (fd);
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close (fd2);
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if (!rc)
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unlink (fname);
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return rc;
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}
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int
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main (int argc, char *argv[])
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{
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char *p = argv[0];
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int optc;
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int rc = 0;
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errno = 0;
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p = getenv ("LZF_BLOCKSIZE");
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if (p)
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{
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blocksize = strtoul (p, 0, 0);
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if (errno || !blocksize || blocksize > MAX_BLOCKSIZE)
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blocksize = BLOCKSIZE;
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}
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p = strrchr (argv[0], '/');
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imagename = p ? ++p : argv[0];
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if (!strncmp (imagename, "un", 2) || !strncmp (imagename, "de", 2))
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mode = uncompress;
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if (strstr (imagename, "cat"))
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mode = lzcat;
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#ifdef HAVE_GETOPT_LONG
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while ((optc = getopt_long (argc, argv, "cdfhvb:", longopts, 0)) != -1)
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#else
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while ((optc = getopt (argc, argv, "cdfhvb:")) != -1)
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#endif
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{
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switch (optc)
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{
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case 'c':
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mode = compress;
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break;
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case 'd':
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mode = uncompress;
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break;
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case 'f':
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force = 1;
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break;
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case 'h':
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usage (0);
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break;
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case 'v':
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verbose = 1;
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break;
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case 'b':
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errno = 0;
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blocksize = strtoul (optarg, 0, 0);
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if (errno || !blocksize || blocksize > MAX_BLOCKSIZE)
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blocksize = BLOCKSIZE;
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break;
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default:
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usage (1);
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break;
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}
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}
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if (optind == argc)
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{ // stdin stdout
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if (!force)
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{
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if ((mode == uncompress || mode == lzcat) && isatty (0))
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{
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fprintf (stderr, "%s: compressed data not read from a terminal. Use -f to force decompression.\n", imagename);
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exit (1);
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}
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if (mode == compress && isatty (1))
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{
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fprintf (stderr, "%s: compressed data not written to a terminal. Use -f to force compression.\n", imagename);
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exit (1);
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}
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}
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if (mode == compress)
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rc = compress_fd (0, 1);
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else
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rc = uncompress_fd (0, 1);
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exit (rc ? 1 : 0);
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}
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while (optind < argc)
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rc |= run_file (argv[optind++]);
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exit (rc ? 1 : 0);
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}
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