| archive_crc32.h (228763) | archive_crc32.h (232153) |
|---|---|
| 1/*- 2 * Copyright (c) 2009 Joerg Sonnenberger 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 --- 8 unchanged lines hidden (view full) --- 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 * | 1/*- 2 * Copyright (c) 2009 Joerg Sonnenberger 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 --- 8 unchanged lines hidden (view full) --- 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 * $FreeBSD: head/contrib/libarchive/libarchive/archive_crc32.h 228763 2011-12-21 11:13:29Z mm $ | 25 * $FreeBSD: head/contrib/libarchive/libarchive/archive_crc32.h 232153 2012-02-25 10:58:02Z mm $ |
| 26 */ 27 28#ifndef __LIBARCHIVE_BUILD 29#error This header is only to be used internally to libarchive. 30#endif 31 32/* 33 * When zlib is unavailable, we should still be able to validate --- 21 unchanged lines hidden (view full) --- 55 crc2 = (crc2 >> 1); 56 } 57 crc_tbl[b] = crc2; 58 } 59 crc_tbl_inited = 1; 60 } 61 62 crc = crc ^ 0xffffffffUL; | 26 */ 27 28#ifndef __LIBARCHIVE_BUILD 29#error This header is only to be used internally to libarchive. 30#endif 31 32/* 33 * When zlib is unavailable, we should still be able to validate --- 21 unchanged lines hidden (view full) --- 55 crc2 = (crc2 >> 1); 56 } 57 crc_tbl[b] = crc2; 58 } 59 crc_tbl_inited = 1; 60 } 61 62 crc = crc ^ 0xffffffffUL; |
| 63 /* A use of this loop is about 20% - 30% faster than 64 * no use version in any optimization option of gcc. */ 65 for (;len >= 8; len -= 8) { 66 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 67 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 68 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 69 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 70 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 71 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 72 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 73 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 74 } |
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| 63 while (len--) 64 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 65 return (crc ^ 0xffffffffUL); 66} | 75 while (len--) 76 crc = crc_tbl[(crc ^ *p++) & 0xff] ^ (crc >> 8); 77 return (crc ^ 0xffffffffUL); 78} |