1 /*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "archive_platform.h" 27 28 __FBSDID("$FreeBSD$"); 29 30 31 #ifdef HAVE_ERRNO_H 32 #include <errno.h> 33 #endif 34 #ifdef HAVE_STDLIB_H 35 #include <stdlib.h> 36 #endif 37 #ifdef HAVE_STRING_H 38 #include <string.h> 39 #endif 40 #ifdef HAVE_UNISTD_H 41 #include <unistd.h> 42 #endif 43 44 #include "archive.h" 45 #include "archive_private.h" 46 #include "archive_read_private.h" 47 48 #define LRZIP_HEADER_MAGIC "LRZI" 49 #define LRZIP_HEADER_MAGIC_LEN 4 50 51 static int lrzip_bidder_bid(struct archive_read_filter_bidder *, 52 struct archive_read_filter *); 53 static int lrzip_bidder_init(struct archive_read_filter *); 54 55 56 static int 57 lrzip_reader_free(struct archive_read_filter_bidder *self) 58 { 59 (void)self; /* UNUSED */ 60 return (ARCHIVE_OK); 61 } 62 63 int 64 archive_read_support_filter_lrzip(struct archive *_a) 65 { 66 struct archive_read *a = (struct archive_read *)_a; 67 struct archive_read_filter_bidder *reader; 68 69 archive_check_magic(_a, ARCHIVE_READ_MAGIC, 70 ARCHIVE_STATE_NEW, "archive_read_support_filter_lrzip"); 71 72 if (__archive_read_get_bidder(a, &reader) != ARCHIVE_OK) 73 return (ARCHIVE_FATAL); 74 75 reader->data = NULL; 76 reader->name = "lrzip"; 77 reader->bid = lrzip_bidder_bid; 78 reader->init = lrzip_bidder_init; 79 reader->options = NULL; 80 reader->free = lrzip_reader_free; 81 /* This filter always uses an external program. */ 82 archive_set_error(_a, ARCHIVE_ERRNO_MISC, 83 "Using external lrzip program for lrzip decompression"); 84 return (ARCHIVE_WARN); 85 } 86 87 /* 88 * Bidder just verifies the header and returns the number of verified bits. 89 */ 90 static int 91 lrzip_bidder_bid(struct archive_read_filter_bidder *self, 92 struct archive_read_filter *filter) 93 { 94 const unsigned char *p; 95 ssize_t avail, len; 96 int i; 97 98 (void)self; /* UNUSED */ 99 /* Start by looking at the first six bytes of the header, which 100 * is all fixed layout. */ 101 len = 6; 102 p = __archive_read_filter_ahead(filter, len, &avail); 103 if (p == NULL || avail == 0) 104 return (0); 105 106 if (memcmp(p, LRZIP_HEADER_MAGIC, LRZIP_HEADER_MAGIC_LEN)) 107 return (0); 108 109 /* current major version is always 0, verify this */ 110 if (p[LRZIP_HEADER_MAGIC_LEN]) 111 return 0; 112 /* support only v0.6+ lrzip for sanity */ 113 i = p[LRZIP_HEADER_MAGIC_LEN + 1]; 114 if ((i < 6) || (i > 10)) 115 return 0; 116 117 return (int)len; 118 } 119 120 static int 121 lrzip_bidder_init(struct archive_read_filter *self) 122 { 123 int r; 124 125 r = __archive_read_program(self, "lrzip -d -q"); 126 /* Note: We set the format here even if __archive_read_program() 127 * above fails. We do, after all, know what the format is 128 * even if we weren't able to read it. */ 129 self->code = ARCHIVE_FILTER_LRZIP; 130 self->name = "lrzip"; 131 return (r); 132 } 133